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FragmentPagerAdapter in a Fragment get error MainActivity must impliement OnFragmentInteractionListener

I have android application with navigation drawer with menu like Videos, Graphs, Share. Each of menu linked to fragment. In Graphs I want to show tabs layout but while implementing ViewPager with fragment for each tab It's raise an exception MainActivity must implement OnFragmentInteractionListener.
Here is logcat errors
10-27 00:12:43.560 31450-31450/com.example.dp.facialemotionalyzer
I/AppCompatViewInflater: app:theme is now deprecated. Please move to
using android:theme instead. 10-27 00:12:43.626
31450-31450/com.example.dp.facialemotionalyzer D/AndroidRuntime:
Shutting down VM
java.lang.RuntimeException: com.example.dp.facialemotionalyzer.activity.MainActivity#a8ce577 must
implement OnFragmentInteractionListener
at
com.example.dp.facialemotionalyzer.fragment.HappinessFragment.onAttach(HappinessFragment.java:77)
at
android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1043)
at
android.support.v4.app.BackStackRecord.setLastIn(BackStackRecord.java:838)
at
android.support.v4.app.BackStackRecord.calculateFragments(BackStackRecord.java:861)
at
android.support.v4.app.BackStackRecord.run(BackStackRecord.java:719)
at
android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1638)
at
android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:679)
at
android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1240)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1088)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1614)
at android.view.View.measure(View.java:18809)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954)
at
android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
at
android.support.design.widget.AppBarLayout.onMeasure(AppBarLayout.java:218)
at android.view.View.measure(View.java:18809)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at android.view.View.measure(View.java:18809)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954)
at
android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:700)
at
android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90)
at
android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1364)
at
android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:765)
at android.view.View.measure(View.java:18809)
at
android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1085)
at android.view.View.measure(View.java:18809)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at
android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)
at android.view.View.measure(View.java:18809)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954)
at
android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
at android.view.View.measure(View.java:18809)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at android.view.View.measure(View.java:18809)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954)
at
android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
at android.view.View.measure(View.java:18809)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at
com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2643)
at android.view.View.measure(View.java:18809)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2112)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1228)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1464)
at android.view.ViewRootImpl.d
This is GraphFragment.java
package com.example.dp.facialemotionalyzer.fragment;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.dp.facialemotionalyzer.R;
import com.example.dp.facialemotionalyzer.other.TabsPagerAdapter;
/**
* A simple {#link Fragment} subclass.
* Activities that contain this fragment must implement the
* {#link GraphFragment.OnFragmentInteractionListener} interface
* to handle interaction events.
* Use the {#link GraphFragment newInstance} factory method to
* create an instance of this fragment.
*/
public class GraphFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
private OnFragmentInteractionListener mListener;
private TabsPagerAdapter mAdapter;
private String[] tabs = {"Happiness", "Anger", "Surprice",
"Neutral", "Sadness"};
public GraphFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View inflatedView = inflater.inflate(R.layout.fragment_graph, container, false);
TabLayout tabLayout = (TabLayout) inflatedView.findViewById(R.id.tabs);
final ViewPager viewPager = (ViewPager) inflatedView.findViewById(R.id.viewpager);
mAdapter = new TabsPagerAdapter(getChildFragmentManager());
viewPager.setAdapter(mAdapter);
for (String tab_name : tabs) {
tabLayout.addTab(tabLayout.newTab().setText(tab_name));
}
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
return inflatedView;
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
This is TabsPagerAdapter.java
package com.example.dp.facialemotionalyzer.other;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import com.example.dp.facialemotionalyzer.fragment.AngerFragment;
import com.example.dp.facialemotionalyzer.fragment.HappinessFragment;
public class TabsPagerAdapter extends FragmentPagerAdapter {
public TabsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int index) {
switch (index) {
case 0:
// Top Rated fragment activity
return new HappinessFragment();
case 1:
// Games fragment activity
return new AngerFragment();
case 2:
// Movies fragment activity
return new HappinessFragment();
case 3:
// Movies fragment activity
return new AngerFragment();
case 4:
// Movies fragment activity
return new HappinessFragment();
case 5:
// Movies fragment activity
return new AngerFragment();
}
return null;
}
#Override
public int getCount() {
// get item count - equal to number of tabs
return 6;
}
}
And This is MainActivity.java
package com.example.dp.facialemotionalyzer.activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Handler;
import android.support.design.widget.NavigationView;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v4.view.GravityCompat;
import android.os.Bundle;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import android.support.v7.widget.Toolbar;
import com.example.dp.facialemotionalyzer.R;
import com.example.dp.facialemotionalyzer.fragment.GraphFragment;
import com.example.dp.facialemotionalyzer.fragment.HomeFragment;
import com.example.dp.facialemotionalyzer.fragment.VideoFragment;
public class MainActivity extends AppCompatActivity implements
GraphFragment.OnFragmentInteractionListener{
private NavigationView navigationView;
private DrawerLayout drawer;
private View navHeader;
private ImageView imgNavHeaderBg, imgProfile;
private TextView txtName, txtWebsite;
private Toolbar toolbar;
private FloatingActionButton fab;
private static final String TAG_HOME = "home";
private static final String TAG_VIDEO = "video";
private static final String TAG_GRAPH = "graph";
private static String CURRENT_TAG = TAG_HOME;
private String[] activityTitles;
private boolean shouldLoadHomeFragOnBackPress = true;
private Handler mHandler;
private int navItemIndex = 0;
static final int REQUEST_VIDEO_CAPTURE = 1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mHandler = new Handler();
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
navigationView = (NavigationView) findViewById(R.id.nav_view);
activityTitles = getResources().getStringArray(R.array.nav_item_activity_titles);
fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
}
});
setUpNavigationView();
if (savedInstanceState == null && checkCameraHardware(getApplicationContext())) {
navItemIndex = 0;
CURRENT_TAG = TAG_HOME;
loadHomeFragment();
}
}
private void loadHomeFragment(){
selectNavMenu();
setToolbarTitle();
if(getSupportFragmentManager().findFragmentByTag(CURRENT_TAG) != null){
drawer.closeDrawers();
toggleFab();
return;
}
Runnable mPendingRunnable = new Runnable() {
#Override
public void run() {
Fragment fragment = getHomeFragment();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.setCustomAnimations(android.R.anim.fade_in,
android.R.anim.fade_out);
fragmentTransaction.replace(R.id.frame, fragment, CURRENT_TAG);
fragmentTransaction.commitAllowingStateLoss();
}
};
if(mPendingRunnable != null){
mHandler.post(mPendingRunnable);
}
toggleFab();
drawer.closeDrawers();
invalidateOptionsMenu();
}
private Fragment getHomeFragment(){
switch (navItemIndex){
case 0:
HomeFragment homeFragment = new HomeFragment();
return homeFragment;
case 1:
VideoFragment videoFragment = new VideoFragment();
return videoFragment;
case 2:
GraphFragment graphFragment = new GraphFragment();
return graphFragment;
default:
return new HomeFragment();
}
}
private void setToolbarTitle(){
getSupportActionBar().setTitle(activityTitles[navItemIndex]);
}
private void selectNavMenu(){
navigationView.getMenu().getItem(navItemIndex).setChecked(true);
}
private void setUpNavigationView() {
//Setting Navigation View Item Selected Listener to handle the item click of the navigation menu
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
// This method will trigger on item Click of navigation menu
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
//Check to see which item was being clicked and perform appropriate action
switch (menuItem.getItemId()) {
//Replacing the main content with ContentFragment Which is our Inbox View;
case R.id.nav_home:
navItemIndex = 0;
CURRENT_TAG = TAG_HOME;
break;
case R.id.nav_video:
navItemIndex = 1;
CURRENT_TAG = TAG_VIDEO;
break;
case R.id.nav_graph:
navItemIndex = 2;
CURRENT_TAG = TAG_GRAPH;
break;
default:
navItemIndex = 0;
}
//Checking if the item is in checked state or not, if not make it in checked state
if (menuItem.isChecked()) {
menuItem.setChecked(false);
} else {
menuItem.setChecked(true);
}
menuItem.setChecked(true);
loadHomeFragment();
return true;
}
});
ActionBarDrawerToggle actionBarDrawerToggle = new ActionBarDrawerToggle(this, drawer, toolbar, R.string.openDrawer, R.string.closeDrawer) {
#Override
public void onDrawerClosed(View drawerView) {
// Code here will be triggered once the drawer closes as we dont want anything to happen so we leave this blank
super.onDrawerClosed(drawerView);
}
#Override
public void onDrawerOpened(View drawerView) {
// Code here will be triggered once the drawer open as we dont want anything to happen so we leave this blank
super.onDrawerOpened(drawerView);
}
};
//Setting the actionbarToggle to drawer layout
drawer.setDrawerListener(actionBarDrawerToggle);
//calling sync state is necessary or else your hamburger icon wont show up
actionBarDrawerToggle.syncState();
}
#Override
public void onBackPressed() {
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawers();
return;
}
// This code loads home fragment when back key is pressed
// when user is in other fragment than home
if (shouldLoadHomeFragOnBackPress) {
// checking if user is on other navigation menu
// rather than home
if (navItemIndex != 0) {
navItemIndex = 0;
CURRENT_TAG = TAG_HOME;
loadHomeFragment();
return;
}
}
super.onBackPressed();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
// show menu only when home fragment is selected
if (navItemIndex == 0) {
getMenuInflater().inflate(R.menu.main, menu);
}
// when fragment is notifications, load the menu created for notifications
if (navItemIndex == 3) {
getMenuInflater().inflate(R.menu.notifications, menu);
}
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_logout) {
Toast.makeText(getApplicationContext(), "Logout user!", Toast.LENGTH_LONG).show();
return true;
}
// user is in notifications fragment
// and selected 'Mark all as Read'
if (id == R.id.action_mark_all_read) {
Toast.makeText(getApplicationContext(), "All notifications marked as read!", Toast.LENGTH_LONG).show();
}
// user is in notifications fragment
// and selected 'Clear All'
if (id == R.id.action_clear_notifications) {
Toast.makeText(getApplicationContext(), "Clear all notifications!", Toast.LENGTH_LONG).show();
}
return super.onOptionsItemSelected(item);
}
// show or hide the fab
private void toggleFab() {
if (navItemIndex == 0)
fab.show();
else
fab.hide();
}
private boolean checkCameraHardware(Context context) {
if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){
// this device has a camera
return true;
} else {
// no camera on this device
return false;
}
}
public void onFragmentInteraction(Uri uri) {
}
}

Custom Navigation Drawer doesn't show Fragment

I'm trying to create a favorite list in my app, for this target I used this tutorial:
http://androidopentutorials.com/android-sharedpreferences-tutorial-and-example/
but to get favorites I used NavigationDrawer instead ActionBar.
The problem is that nothing happens when I choose Favorites or Home in Drawer.
The Logcat shows only one error which not connected with my problem.
Where did I mistake?
Error:
06-30 17:41:48.530 6971-6971/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.boom.kayakapp, PID: 6971
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.widget.ImageView.getTag()' on a null object reference
at com.boom.kayakapp.activities.MainActivity$2.onItemLongClick(MainActivity.java:148)
at android.widget.AbsListView.showContextMenuForChild(AbsListView.java:3162)
at android.view.ViewGroup.showContextMenuForChild(ViewGroup.java:693)
at android.view.ViewGroup.showContextMenuForChild(ViewGroup.java:693)
at android.view.View.showContextMenu(View.java:4853)
at android.view.View.performLongClick(View.java:4822)
at android.widget.TextView.performLongClick(TextView.java:8684)
at android.view.View$CheckForLongPress.run(View.java:19840)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
--------- beginning of system
06-30 17:41:48.572 933-933/? E/EGL_emulation﹕ tid 933: eglCreateSyncKHR(1237): error 0x3004 (EGL_BAD_ATTRIBUTE)
06-30 17:41:50.823 1232-1274/system_process E/InputDispatcher﹕ channel '10153f49 com.boom.kayakapp/com.boom.kayakapp.activities.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
06-30 17:42:02.006 7546-7546/? E/memtrack﹕ Couldn't load memtrack module (No such file or directory)
06-30 17:42:02.006 7546-7546/? E/android.os.Debug﹕ failed to load memtrack module: -2
06-30 17:42:02.041 7546-7555/? E/art﹕ Thread attaching while runtime is shutting down: Binder_1
06-30 17:42:02.402 7560-7560/? E/memtrack﹕ Couldn't load memtrack module (No such file or directory)
06-30 17:42:02.402 7560-7560/? E/android.os.Debug﹕ failed to load memtrack module: -2
06-30 17:42:02.460 7560-7570/? E/art﹕ Thread attaching while runtime is shutting down: Binder_1
Main Activity:
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonArrayRequest;
import com.boom.kayakapp.R;
import com.boom.kayakapp.adapters.AirlinesAdapter;
import com.boom.kayakapp.adapters.NavDrawerListAdapter;
import com.boom.kayakapp.controllers.AppController;
import com.boom.kayakapp.fragment.AirlinesFragment;
import com.boom.kayakapp.fragment.FavoriteFragment;
import com.boom.kayakapp.fragment.HomeFragment;
import com.boom.kayakapp.model.Airlines;
import com.boom.kayakapp.model.NavDrawerItem;
import com.boom.kayakapp.util.SharedPreference;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends ActionBarActivity {
private Fragment contentFragment;
AirlinesFragment airlinesFragment;
FavoriteFragment favoriteFragment;
// JSON Node names
public static final String TAG_NAME = "name";
public static final String TAG_PHONE = "phone";
public static final String TAG_SITE = "site";
public static final String TAG_LOGO = "logoURL";
public static final String TAG_CODE = "code";
// Log tag
private static final String TAG = MainActivity.class.getSimpleName();
// Airlines json url
private static final String url = "https://www.kayak.com/h/mobileapis/directory/airlines";
public ProgressDialog pDialog;
public List<Airlines> airlinesList = new ArrayList<Airlines>();
public ListView listView;
public AirlinesAdapter adapterAirlines;
SharedPreference sharedPreference;
// DrawerLayout
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapterDrawer;
#Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
// SharedPrefs
sharedPreference = new SharedPreference();
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
// Json Array
listView = (ListView) findViewById(R.id.list);
adapterAirlines = new AirlinesAdapter(this, airlinesList);
listView.setAdapter(adapterAirlines);
pDialog = new ProgressDialog(this);
// Showing progress dialog before making http request
pDialog.setMessage("Loading...");
pDialog.show();
// Listview OnItemClickListener
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String name = ((TextView) view.findViewById(R.id.name))
.getText().toString();
String phone = ((TextView) view.findViewById(R.id.phone))
.getText().toString();
String site = ((TextView) view.findViewById(R.id.site))
.getText().toString();
String logoURL = String.valueOf(((ImageView) view.findViewById(R.id.logoURL)));
// Starting single contact activity
Intent in = new Intent(getApplicationContext(),
SingleContactActivity.class);
in.putExtra(TAG_NAME, name);
in.putExtra(TAG_PHONE, phone);
in.putExtra(TAG_SITE, site);
in.putExtra(TAG_LOGO, logoURL);
startActivity(in);
}
});
listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
#Override
public boolean onItemLongClick(AdapterView<?> parent, View view,
int position, long id) {
ImageView button = (ImageView) view.findViewById(R.id.favorite_button);
String tag = button.getTag().toString();
if (tag.equalsIgnoreCase("grey")) {
sharedPreference.addFavorite(MainActivity.this, airlinesList.get(position));
Toast.makeText(MainActivity.this,
MainActivity.this.getResources().getString(R.string.add_favr),
Toast.LENGTH_SHORT).show();
button.setTag("red");
button.setImageResource(R.drawable.heart_red);
} else {
sharedPreference.removeFavorite(MainActivity.this, airlinesList.get(position));
button.setTag("grey");
button.setImageResource(R.drawable.heart_grey);
Toast.makeText(MainActivity.this,
MainActivity.this.getResources().getString(R.string.remove_favr),
Toast.LENGTH_SHORT).show();
}
return true;
}
});
// changing action bar color
getSupportActionBar().setBackgroundDrawable(
new ColorDrawable(Color.parseColor("#1b1b1b")));
// Creating volley request obj
JsonArrayRequest airlinesReq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
Airlines airlines = new Airlines();
airlines.setName(obj.getString("name"));
airlines.setLogoURL(obj.getString("logoURL"));
airlines.setPhone(obj.getString("phone"));
airlines.setCode(obj.getInt("code"));
airlines.setSite(obj.getString("site"));
// adding airlines to array
airlinesList.add(airlines);
} catch (JSONException e) {
e.printStackTrace();
}
}
// notifying list adapterAirlines about data changes
// so that it renders the list view with updated data
adapterAirlines.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(airlinesReq);
FragmentManager fragmentManager = getSupportFragmentManager();
/*
* This is called when orientation is changed.
*/
if (savedInstanceState != null) {
if (savedInstanceState.containsKey("content")) {
String content = savedInstanceState.getString("content");
if (content.equals(FavoriteFragment.ARG_ITEM_ID)) {
if (fragmentManager.findFragmentByTag(FavoriteFragment.ARG_ITEM_ID) != null) {
setFragmentTitle(R.string.favorites);
contentFragment = fragmentManager
.findFragmentByTag(FavoriteFragment.ARG_ITEM_ID);
}
}
}
if (fragmentManager.findFragmentByTag(AirlinesFragment.ARG_ITEM_ID) != null) {
airlinesFragment = (AirlinesFragment) fragmentManager
.findFragmentByTag(AirlinesFragment.ARG_ITEM_ID);
contentFragment = airlinesFragment;
}
} else {
airlinesFragment = new AirlinesFragment();
switchContent(airlinesFragment, AirlinesFragment.ARG_ITEM_ID);
}
/*
From this place DrawerLayout starts
*/
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
navDrawerItems = new ArrayList<NavDrawerItem>();
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
// Favorites
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
// Recycle the typed array
navMenuIcons.recycle();
// setting the nav drawer list adapterDrawer
adapterDrawer = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapterDrawer);
// enabling action bar app icon and behaving it as toggle button
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, //nav menu toggle icon
R.string.app_name, // nav drawer open - description for accessibility
R.string.app_name // nav drawer close - description for accessibility
){
public void onDrawerClosed(View view) {
getSupportActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getSupportActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
// on first time display view for first nav item
displayView(0);
}
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
// if (mDrawerToggle.onOptionsItemSelected(item)) {
// return true;
// }
// Handle action bar actions click
// switch (item.getItemId()) {
// case R.id.action_settings:
// return true;
// default:
// return super.onOptionsItemSelected(item);
// }
//
switch (item.getItemId()) {
case R.id.action_settings:
setFragmentTitle(R.string.favorites);
favoriteFragment = new FavoriteFragment();
switchContent(favoriteFragment, FavoriteFragment.ARG_ITEM_ID);
return true;
}
return super.onOptionsItemSelected(item);
}
/***
* Called when invalidateOptionsMenu() is triggered
*/
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
/**
* Diplaying fragment view for selected nav drawer list item
* */
private void displayView(int position) {
// update the main content by replacing fragments
Fragment fragment = null;
switch (position) {
case 0:
fragment = new HomeFragment();
break;
case 1:
fragment = new FavoriteFragment();
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}
#Override
public void setTitle(CharSequence title) {
mTitle = title;
getSupportActionBar().setTitle(mTitle);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
#Override
public void onDestroy () {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
protected void onSaveInstanceState(Bundle outState) {
if (contentFragment instanceof FavoriteFragment) {
outState.putString("content", FavoriteFragment.ARG_ITEM_ID);
} else {
outState.putString("content", AirlinesFragment.ARG_ITEM_ID);
}
super.onSaveInstanceState(outState);
}
public void switchContent(Fragment fragment, String tag) {
FragmentManager fragmentManager = getSupportFragmentManager();
while (fragmentManager.popBackStackImmediate()) ;
if (fragment != null) {
FragmentTransaction transaction = fragmentManager
.beginTransaction();
transaction.replace(R.id.content_frame, fragment, tag);
//Only FavoriteFragment is added to the back stack.
if (!(fragment instanceof AirlinesFragment)) {
transaction.addToBackStack(tag);
}
transaction.commit();
contentFragment = fragment;
}
}
protected void setFragmentTitle(int resourseId) {
setTitle(resourseId);
getSupportActionBar().setTitle(resourseId);
}
/*
* We call super.onBackPressed(); when the stack entry count is > 0. if it
* is instanceof ProductListFragment or if the stack entry count is == 0, then
* we finish the activity.
* In other words, from AirlinesFragment on back press it quits the app.
*/
#Override
public void onBackPressed() {
FragmentManager fm = getSupportFragmentManager();
if (fm.getBackStackEntryCount() > 0) {
super.onBackPressed();
} else if (contentFragment instanceof AirlinesFragment
|| fm.getBackStackEntryCount() == 0) {
finish();
}
}
#Override
public void onResume() {
super.onResume();
}
}
FavoriteFragment:
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Toast;
import com.boom.kayakapp.R;
import com.boom.kayakapp.adapters.AirlinesAdapter;
import com.boom.kayakapp.model.Airlines;
import com.boom.kayakapp.util.SharedPreference;
import java.util.List;
public class FavoriteFragment extends Fragment {
public static final String ARG_ITEM_ID = "favorite_list";
ListView favoriteList;
SharedPreference sharedPreference;
List<Airlines> favorites;
Activity activity;
AirlinesAdapter airlinesAdapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
activity = getActivity();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_list, container,
false);
// Get favorite items from SharedPreferences.
sharedPreference = new SharedPreference();
favorites = sharedPreference.getFavorites(activity);
if (favorites == null) {
showAlert(getResources().getString(R.string.no_favorites_items),
getResources().getString(R.string.no_favorites_msg));
} else {
if (favorites.size() == 0) {
showAlert(
getResources().getString(R.string.no_favorites_items),
getResources().getString(R.string.no_favorites_msg));
}
favoriteList = (ListView) view.findViewById(R.id.list);
if (favorites != null) {
airlinesAdapter = new AirlinesAdapter(activity, favorites);
favoriteList.setAdapter(airlinesAdapter);
favoriteList.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View arg1,
int position, long arg3) {
}
});
favoriteList
.setOnItemLongClickListener(new OnItemLongClickListener() {
#Override
public boolean onItemLongClick(
AdapterView<?> parent, View view,
int position, long id) {
ImageView button = (ImageView) view
.findViewById(R.id.favorite_button);
String tag = button.getTag().toString();
if (tag.equalsIgnoreCase("grey")) {
sharedPreference.addFavorite(activity,
favorites.get(position));
Toast.makeText(
activity,
activity.getResources().getString(
R.string.add_favr),
Toast.LENGTH_SHORT).show();
button.setTag("red");
button.setImageResource(R.drawable.heart_red);
} else {
sharedPreference.removeFavorite(activity,
favorites.get(position));
button.setTag("grey");
button.setImageResource(R.drawable.heart_grey);
airlinesAdapter.remove(favorites
.get(position));
Toast.makeText(
activity,
activity.getResources().getString(
R.string.remove_favr),
Toast.LENGTH_SHORT).show();
}
return true;
}
});
}
}
return view;
}
public void showAlert(String title, String message) {
if (activity != null && !activity.isFinishing()) {
AlertDialog alertDialog = new AlertDialog.Builder(activity)
.create();
alertDialog.setTitle(title);
alertDialog.setMessage(message);
alertDialog.setCancelable(false);
// setting OK Button
alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
// activity.finish();
getFragmentManager().popBackStackImmediate();
}
});
alertDialog.show();
}
}
#Override
public void onResume() {
getActivity().setTitle(R.string.favorites);
super.onResume();
}
}

The error looks pretty self-explaining to me.
java.lang.NullPointerException: Attempt to invoke virtual method
'java.lang.Object android.widget.ImageView.getTag()' on a null object
reference
The button you are trying to find by id after a long click is returning null so you are unable to use the getTag() method on that object.
ImageView button = (ImageView) view.findViewById(R.id.favorite_button);
So you should check if the favorite list is really containing a view (button) with that ID. Try using getActivity().findViewByID() instead to test this.

Android: Starting a navigation drawer from an activity

There are lots of question which are similar to mine but I couldn't find any solution in those answers.
My program first shows a splash screen than comes to a log-in screen. After the user logs in I want to call the navigation drawer because my main screen and profile screen are in the navigation drawer as a fragment. So basically iI am trying to call a fragment which is a part of navigation drawer, from an activity.
Here is how I try to call the fragment;
private void loguserIn(User returnedUser){
userLocalStore.storeUserData(returnedUser);
userLocalStore.setUserLoggedIn(true);
Intent intent = new Intent(this,userprofile.class);
startActivity(intent);
}
But when i call this method it force closes.
Here is the userprofile fragment;
package com.okanyakit.watchme;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
/**
* Created by okan on 4/23/2015.
*/
public class userprofile extends android.support.v4.app.Fragment implements View.OnClickListener{
View rootview;
Button logoutbutton;
EditText regusername, regpassword, regemail, regphonenumber, regbloodtype, regbirthday, regaddress;
UserLocalStore userLocalStore;
Context context;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootview = inflater.inflate(R.layout.userprofile_layout,container,false);
regusername = (EditText)rootview.findViewById(R.id.regusername);
regpassword = (EditText)rootview.findViewById(R.id.regpassword);
regemail = (EditText)rootview.findViewById(R.id.regemail);
regphonenumber = (EditText)rootview.findViewById(R.id.regphonenumber);
regbloodtype = (EditText)rootview.findViewById(R.id.regbloodtype);
regbirthday = (EditText)rootview.findViewById(R.id.regbirthday);
regaddress = (EditText)rootview.findViewById(R.id.regaddress);
logoutbutton = (Button)rootview.findViewById(R.id.regbutton);
logoutbutton.setOnClickListener(this);
userLocalStore = new UserLocalStore(this);
return rootview;
}
#Override
public void onStart() {
super.onStart();
if (authenticate()== true)
{
displayUserDetails();
}
else{
Intent intent = new Intent(getActivity(),loginscreen.class);
startActivity(intent);
}
}
private void displayUserDetails()
{
User user = userLocalStore.getLoggedInUser();
regusername.setText(user.username);
regemail.setText(user.email);
regphonenumber.setText(user.phonenumber);
regbloodtype.setText(user.bloodtype);
regaddress.setText(user.address);
}
private boolean authenticate()
{
return userLocalStore.getuserloogedin();
}
#Override
public void onClick(View v) {
switch (v.getId())
{
case R.id.logoutbutton:
userLocalStore.clearUserData();
userLocalStore.setUserLoggedIn(false);
break;
}
}
}
Here is the slide menu ;
package com.okanyakit.watchme;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
public class slidemenu extends ActionBarActivity
implements NavigationDrawerFragment.NavigationDrawerCallbacks {
/**
* Fragment managing the behaviors, interactions and presentation of the navigation drawer.
*/
private NavigationDrawerFragment mNavigationDrawerFragment;
/**
* Used to store the last screen title. For use in {#link #restoreActionBar()}.
*/
private CharSequence mTitle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_slidemenu);
mNavigationDrawerFragment = (NavigationDrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
}
#Override
public void onNavigationDrawerItemSelected(int position) {
Fragment objfragment = null;
switch (position) {
case 0:
objfragment = new mainscreen();
break;
case 1:
objfragment = new userprofile();
break;
case 2:
objfragment = new usermessage();
break;
case 3:
objfragment = new alarmsettings();
break;
}
// update the main content by replacing fragments
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, objfragment)
.commit();
}
public void onSectionAttached(int number) {
switch (number) {
case 1:
mTitle = getString(R.string.title_section1);
break;
case 2:
mTitle = getString(R.string.title_section2);
break;
case 3:
mTitle = getString(R.string.title_section3);
break;
case 4:
mTitle = getString(R.string.title_section4);
break;
}
}
public void restoreActionBar() {
ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle(mTitle);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
if (!mNavigationDrawerFragment.isDrawerOpen()) {
// Only show items in the action bar relevant to this screen
// if the drawer is not showing. Otherwise, let the drawer
// decide what to show in the action bar.
getMenuInflater().inflate(R.menu.slidemenu, menu);
restoreActionBar();
return true;
}
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_slidemenu, container, false);
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((slidemenu) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
}
Andr here is the navigationdrawer class
package com.okanyakit.watchme;
import android.support.v7.app.ActionBarActivity;
import android.app.Activity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
/**
* Fragment used for managing interactions for and presentation of a navigation drawer.
* See the <a href="https://developer.android.com/design/patterns/navigation-drawer.html#Interaction">
* design guidelines</a> for a complete explanation of the behaviors implemented here.
*/
public class NavigationDrawerFragment extends Fragment {
/**
* Remember the position of the selected item.
*/
private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";
/**
* Per the design guidelines, you should show the drawer on launch until the user manually
* expands it. This shared preference tracks this.
*/
private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";
/**
* A pointer to the current callbacks instance (the Activity).
*/
private NavigationDrawerCallbacks mCallbacks;
/**
* Helper component that ties the action bar to the navigation drawer.
*/
private ActionBarDrawerToggle mDrawerToggle;
private DrawerLayout mDrawerLayout;
private ListView mDrawerListView;
private View mFragmentContainerView;
private int mCurrentSelectedPosition = 0;
private boolean mFromSavedInstanceState;
private boolean mUserLearnedDrawer;
public NavigationDrawerFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Read in the flag indicating whether or not the user has demonstrated awareness of the
// drawer. See PREF_USER_LEARNED_DRAWER for details.
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);
if (savedInstanceState != null) {
mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);
mFromSavedInstanceState = true;
}
// Select either the default item (0) or the last selected item.
selectItem(mCurrentSelectedPosition);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
// Indicate that this fragment would like to influence the set of actions in the action bar.
setHasOptionsMenu(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mDrawerListView = (ListView) inflater.inflate(
R.layout.fragment_navigation_drawer, container, false);
mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
});
mDrawerListView.setAdapter(new ArrayAdapter<String>(
getActionBar().getThemedContext(),
android.R.layout.simple_list_item_1,
android.R.id.text1,
new String[]{
getString(R.string.title_section1),
getString(R.string.title_section2),
getString(R.string.title_section3),
getString(R.string.title_section4),
}));
mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
return mDrawerListView;
}
public boolean isDrawerOpen() {
return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView);
}
/**
* Users of this fragment must call this method to set up the navigation drawer interactions.
*
* #param fragmentId The android:id of this fragment in its activity's layout.
* #param drawerLayout The DrawerLayout containing this fragment's UI.
*/
public void setUp(int fragmentId, DrawerLayout drawerLayout) {
mFragmentContainerView = getActivity().findViewById(fragmentId);
mDrawerLayout = drawerLayout;
// set a custom shadow that overlays the main content when the drawer opens
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
// set up the drawer's list view with items and click listener
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
// ActionBarDrawerToggle ties together the the proper interactions
// between the navigation drawer and the action bar app icon.
mDrawerToggle = new ActionBarDrawerToggle(
getActivity(), /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */
R.string.navigation_drawer_open, /* "open drawer" description for accessibility */
R.string.navigation_drawer_close /* "close drawer" description for accessibility */
) {
#Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
if (!isAdded()) {
return;
}
getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
}
#Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
if (!isAdded()) {
return;
}
if (!mUserLearnedDrawer) {
// The user manually opened the drawer; store this flag to prevent auto-showing
// the navigation drawer automatically in the future.
mUserLearnedDrawer = true;
SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(getActivity());
sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).commit();
}
getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
}
};
// If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer,
// per the navigation drawer design guidelines.
if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
mDrawerLayout.openDrawer(mFragmentContainerView);
}
// Defer code dependent on restoration of previous instance state.
mDrawerLayout.post(new Runnable() {
#Override
public void run() {
mDrawerToggle.syncState();
}
});
mDrawerLayout.setDrawerListener(mDrawerToggle);
}
private void selectItem(int position) {
mCurrentSelectedPosition = position;
if (mDrawerListView != null) {
mDrawerListView.setItemChecked(position, true);
}
if (mDrawerLayout != null) {
mDrawerLayout.closeDrawer(mFragmentContainerView);
}
if (mCallbacks != null) {
mCallbacks.onNavigationDrawerItemSelected(position);
}
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mCallbacks = (NavigationDrawerCallbacks) activity;
} catch (ClassCastException e) {
throw new ClassCastException("Activity must implement NavigationDrawerCallbacks.");
}
}
#Override
public void onDetach() {
super.onDetach();
mCallbacks = null;
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition);
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Forward the new configuration the drawer toggle component.
mDrawerToggle.onConfigurationChanged(newConfig);
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// If the drawer is open, show the global app actions in the action bar. See also
// showGlobalContextActionBar, which controls the top-left area of the action bar.
if (mDrawerLayout != null && isDrawerOpen()) {
inflater.inflate(R.menu.global, menu);
showGlobalContextActionBar();
}
super.onCreateOptionsMenu(menu, inflater);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
if (item.getItemId() == R.id.action_example) {
Toast.makeText(getActivity(), "Example action.", Toast.LENGTH_SHORT).show();
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* Per the navigation drawer design guidelines, updates the action bar to show the global app
* 'context', rather than just what's in the current screen.
*/
private void showGlobalContextActionBar() {
ActionBar actionBar = getActionBar();
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setTitle(R.string.app_name);
}
private ActionBar getActionBar() {
return ((ActionBarActivity) getActivity()).getSupportActionBar();
}
/**
* Callbacks interface that all activities using this fragment must implement.
*/
public static interface NavigationDrawerCallbacks {
/**
* Called when an item in the navigation drawer is selected.
*/
void onNavigationDrawerItemSelected(int position);
}
}
I don't know what is the main cause of this so tried to put everything that is involved in here.

I think this should work for you.
DrawerLayout mLayout = (DrawerLayout) mNavigationDrawerFragment.findViewById(R.id.drawer_layout);
mLayout.openDrawer(mLayout);

You cannot call a fragment with Intents. An intent is an abstract description of an operation to be performed. It can be used with startActivity to launch an Activity.
You can call your fragment with
ExampleFragment fragment = (ExampleFragment)getFragmentManager.getfindFragmentById(R.id.example_fragment);
To put the fragment in your activity, use this method in your oncreate of your activity:
if (savedInstance == null)
{
getFragmentManger().beginTransaction().Add(R.id.container, new ExampleFragment()).commit();
}
where R.id.container is the ID in your activity layoutfile of the placeholder in which you want to place your fragments.

fragments - how to use them with activities that require actions?

First - apologies for the newbie question.
I'm trying to implement a Navigation Drawer that will be used across my app. To start, I've followed the Android tutorial and created a basic navigation which changes a with Fragments.
I can pass a framelayout id and fragment to FragmentTransaction. It works great.
I decided to create a new login activity with the default android files (In Android Studio: going to new - activity - login activity ). This is what's confusing me. My questions are:
Can I create a fragment of the login activity where the actions in LoginActivity will work? It looks like the fragment will create a view based on the layout passed, but the methods used in LoginActivity won't work?
If creating a fragment does not work for the login activity, what would be the cleanest way to ensure the navigation works when switching activities? The Navigation Drawer only works when on the main activity; switching to other activities (via Intent) causes the app to lose the navigation drawer actions. The image of the actionbar/navigation drawer remains.
Here's some of my code in MainActivity ... maybe I'm missing something that is causing the navigation drawer to stop functioning when switching activities by Intent?
(Note: LoginActivity extends MainActivity in the LoginActivity class)
Thanks in advance for any direction / advice!
public class MainActivity extends ActionBarActivity {
private NavigationDrawerFragment mNavigationDrawerFragment;
//USER DATA
public String mUserID;
public String mToken;
public String mProgramData;
//NAVIGATION DRAWER
private CharSequence mTitle;
private CharSequence mDrawerTitle;
private String[] mTitles;
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mActionBarDrawerToggle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = getTitle();
// get list items for nav
mTitles = getResources().getStringArray(R.array.nav_menu);
//drawer widget
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
//listview of left drawer
mDrawerList = (ListView) findViewById(R.id.left_drawer);
// Set up the drawer.
mDrawerList.setAdapter(new ArrayAdapter<>(this,
R.layout.drawer_list_item, mTitles));
//set onclicklistener on the each list item of menu options
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
// some styling...
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
//enables action bar app behavior
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
// ties drawerlayout and actionbar for navigation drawers
mActionBarDrawerToggle = new ActionBarDrawerToggle(
this,
mDrawerLayout,
R.string.navigation_drawer_open,
R.string.navigation_drawer_close) {
// different titles for the drawer actions
public void onDrawerClosed(View drawerView) {
getSupportActionBar().setTitle(mTitle);
}
public void onDrawerOpened(View drawerView) {
getSupportActionBar().setTitle(mDrawerTitle);
}
};
// set drawer toggle as the drawer listener
mDrawerLayout.setDrawerListener(mActionBarDrawerToggle);
}
private class DrawerItemClickListener implements ListView.OnItemClickListener {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id){
selectItem(position);
}
}
#Override
protected void onPostCreate(Bundle savedInstanceState){
super.onPostCreate(savedInstanceState);
mActionBarDrawerToggle.syncState();
}
#Override
public void onConfigurationChanged(Configuration newConfig){
super.onConfigurationChanged(newConfig);
mActionBarDrawerToggle.onConfigurationChanged(newConfig);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (mActionBarDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
switch(id) {
case R.id.action_home:
Intent home = new Intent(this, MainActivity.class);
this.startActivity(home);
break;
case R.id.action_login:
Intent login = new Intent(this, LoginActivity.class);
this.startActivity(login);
break;
}
return super.onOptionsItemSelected(item);
}
EDIT
Thanks for your help so far in guiding me with my issue.
Unfortunately I don't think I'm asking the right question, but maybe viewing the LoginActivity code from Android Studio would help.
This is part of LoginActivity:
public class LoginActivity extends MainActivity implements LoaderCallbacks<Cursor> {
private UserLoginTask mAuthTask = null;
// UI references.
private AutoCompleteTextView mUserIDView;
private EditText mPasswordView;
private View mProgressView;
private View mLoginFormView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
// Set up the login form.
mUserIDView = (AutoCompleteTextView) findViewById(R.id.email);
populateAutoComplete();
mPasswordView = (EditText) findViewById(R.id.password);
mPasswordView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
#Override
public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
if (id == R.id.login || id == EditorInfo.IME_NULL) {
attemptLogin();
return true;
}
return false;
}
});
Button mEmailSignInButton = (Button) findViewById(R.id.email_sign_in_button);
mEmailSignInButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view) {
attemptLogin();
}
});
mLoginFormView = findViewById(R.id.login_form);
mProgressView = findViewById(R.id.login_progress);
}
private void populateAutoComplete() {
getLoaderManager().initLoader(0, null, this);
}
/**
* Attempts to sign in or register the account specified by the login form.
* If there are form errors (invalid email, missing fields, etc.), the
* errors are presented and no actual login attempt is made.
*/
public void attemptLogin() {
if (mAuthTask != null) {
return;
}
// Reset errors.
mUserIDView.setError(null);
mPasswordView.setError(null);
// Store values at the time of the login attempt.
String email = mUserIDView.getText().toString();
String password = mPasswordView.getText().toString();
boolean cancel = false;
View focusView = null;
// Check for a valid password, if the user entered one.
if (TextUtils.isEmpty(password)) {
mPasswordView.setError(getString(R.string.error_invalid_password));
focusView = mPasswordView;
cancel = true;
}
// Check for a valid email address or ID.
if (TextUtils.isEmpty(email)) {
mUserIDView.setError(getString(R.string.error_field_required));
focusView = mUserIDView;
cancel = true;
} else if (!isEmailValid(email) && !isIDValid(email)) {
mUserIDView.setError(getString(R.string.error_invalid_email));
focusView = mUserIDView;
cancel = true;
}
if (cancel) {
// There was an error; don't attempt login and focus the first
// form field with an error.
focusView.requestFocus();
} else {
// Show a progress spinner, and kick off a background task to
// perform the user login attempt.
showProgress(true);
mAuthTask = new UserLoginTask(email, password);
mAuthTask.execute((Void) null);
}
}
private boolean isEmailValid(String email) {
//TODO: Replace this with your own logic
return email.contains("#");
}
private boolean isIDValid(String email) {
//TODO: Replace this with your own logic
return email.length() == 6;
}
[continued]...........
I'll create a simple fragment of LoginActivity called menu1_Fragment:
public class menu1_Fragment extends android.support.v4.app.Fragment {
View rootview;
public View onCreateView(LayoutInflater inflater, ViewGroup view, Bundle savedInstanceState) {
rootview = (ViewGroup)inflater.inflate(R.layout.activity_login, null);
return rootview;
}
}
If i'm correct (hopefully I'm wrong!) the fragment is replaced with the View (menu1_Fragment). The View cannot have actions (like clicking the login button to send a httppost request).
Also, could you explain why onOptionsItemSelected in MainActivity breaks the navigationdrawer (drawer becomes unclickable. also cannot swipe right to pull it up). Intent launches an activity (LoginActivity), but only the drawer in apperance shows.

to hide also ActionBar icons you can do like:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
To replace main fragment when you click an item from the drawable menu list i see you have used selectItem(position) method, however that method is never declared on your code. To do that also you can do something like:
private void selectItem(int position){
// update the main content by replacing fragments
Fragment fragment = null;
switch (position) {
case 1:
fragment = new TestFragment();
break;
case 2:
fragment = new TestFragment2();
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
// update selected item and title, then close the drawer
setTitle(navMenuTitles[position]);
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
mDrawerLayout.closeDrawer(mDrawerList);
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}

I am giving you a example with multiple activities defined as fragment and called using MainActivity, Hope you will get your solution among it..
MainActivity.java
package com.example.fragmentdemo1;
import java.util.ArrayList;
import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.ActionBarActivity;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity implements
OnItemClickListener {
MainActivity activity;
private ListView lv;
private ArrayList<String> list = new ArrayList<String>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
activity = this;
lv = (ListView) findViewById(R.id.listView);
list.add("First");
list.add("Second");
list.add("Third");
list.add("Forth");
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(activity,
android.R.layout.simple_list_item_1, list);
lv.setAdapter(adapter);
lv.setOnItemClickListener(this);
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
switch (position) {
case 0:
Fragment1 f1 = new Fragment1();
FragmentTransaction transaction = getSupportFragmentManager()
.beginTransaction();
transaction.addToBackStack(null);
transaction.replace(R.id.container, f1).commit();
break;
case 1:
Fragment2 f2 = new Fragment2();
FragmentTransaction transaction2 = getSupportFragmentManager()
.beginTransaction();
transaction2.addToBackStack(null);
transaction2.replace(R.id.container, f2).commit();
break;
case 2:
Toast.makeText(activity, "" + position, 1000).show();
Fragment3 f3 = new Fragment3();
FragmentTransaction transaction3 = getSupportFragmentManager()
.beginTransaction();
transaction3.addToBackStack(null);
transaction3.replace(R.id.container, f3).commit();
break;
case 3:
Fragment4 f4 = new Fragment4();
FragmentTransaction transaction4 = getSupportFragmentManager()
.beginTransaction();
transaction4.addToBackStack(null);
transaction4.replace(R.id.container, f4).commit();
break;
default:
break;
}
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
switch (id) {
case android.R.id.home:
finish();
break;
default:
break;
}
return false;
}
}
Fragment1.java
package com.example.fragmentdemo1;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class Fragment1 extends android.support.v4.app.Fragment{
TextView tv;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup view,
Bundle savedInstanceState) {
tv =(TextView)view.findViewById(R.id.textView1);
view = (ViewGroup) inflater.inflate(R.layout.fragment1, null);
return view;
}
}
Fragment2.java
package com.example.fragmentdemo1;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class Fragment2 extends Fragment {
TextView tv;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup view,
Bundle savedInstanceState) {
tv =(TextView)view.findViewById(R.id.textView2);
view = (ViewGroup) inflater.inflate(R.layout.fragment2, null);
return view;
}
}
Fragment3.java
package com.example.fragmentdemo1;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class Fragment3 extends Fragment {
TextView tv;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup view,
Bundle savedInstanceState) {
tv =(TextView)view.findViewById(R.id.textView3);
view =(ViewGroup)inflater.inflate(R.layout.fragment3, null);
return view;
}
}
Fragment4.java
package com.example.fragmentdemo1;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class Fragment4 extends Fragment{
TextView tv;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup view,
Bundle savedInstanceState) {
tv =(TextView)view.findViewById(R.id.textView4);
view = (ViewGroup)inflater.inflate(R.layout.fragment4, null);
return view;
}
}
NOTE : If you want to use method from Fragment class to MainActivity, then you can make it public static, and you can use that method directly by it's class name like Fragment1.countData().
This demo also apply for Navigation drawer.

Set Initial Fragment on startup

I am trying to set which fragment should be displayed first on start up. To determine this I check whether the user is logged in with ParseUser.getCurrentUser() and if a file is present on the device. On start up, I want to set which fragment to display. to do so i put this code in the initial fragments onCreate Method.
if (ParseUser.getCurrentUser() != null) {
File f = new File(getActivity().getFilesDir() + "/display_store.bin");
if (f.exists() && !f.isDirectory()) {
ft.replace(R.id.container, new Display()).commit();
} else {
ft.replace(R.id.container, new CollectionFragment()).commit();
}
} else {
ft.replace(R.id.container, new Authentication()).commit();
}
I am able to determine which fragment is displayed on start up. But in my Navigation Drawer When I select My information and My display it only replaces the fragment with my Display and I am not able to display My information from the Navigation Drawer. For some reason it is just ignoring CollectionFragment.
Main Activity:
import android.app.Activity;
import android.app.ActionBar;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.support.v4.widget.DrawerLayout;
import com.microsoft.windowsazure.mobileservices.*;
import com.parse.Parse;
import com.parse.ParseUser;
import java.io.File;
import java.net.MalformedURLException;
public class MainActivity extends Activity
implements NavigationDrawerFragment.NavigationDrawerCallbacks {
/**
* Fragment managing the behaviors, interactions and presentation of the navigation drawer.
*/
private NavigationDrawerFragment mNavigationDrawerFragment;
/**
* Used to store the last screen title. For use in {#link #restoreActionBar()}.
*/
private CharSequence mTitle;
private static MobileServiceClient mClient;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mNavigationDrawerFragment = (NavigationDrawerFragment)
getFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
Parse.enableLocalDatastore(this);
Parse.initialize(this, "api", "key");
try {
mClient = new MobileServiceClient("url", "key", this);
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
public static MobileServiceClient getmClient() {
return mClient;
}
#Override
//Sets fragment
public void onNavigationDrawerItemSelected(int position) {
// update the main content by replacing fragments
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, PlaceholderFragment.newInstance(position + 1))
.commit();
}
public void onSectionAttached(int number) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction ft = fragmentManager.beginTransaction();
switch (number) {
case 1:
mTitle = "Home";
break;
case 2:
mTitle = "My Information";
ft.replace(R.id.container, new CollectionFragment()).commit();
break;
case 3:
mTitle = "My Display";
ft.replace(R.id.container, new Display()).commit();
break;
case 4:
mTitle = "Donate";
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.google.org"));
startActivity(browserIntent);
break;
case 5:
mTitle = "Settings";
break;
case 6:
mTitle = "Log Out";
ParseUser.logOut();
ft.replace(R.id.container, new Authentication()).commit();
break;
}
}
public void restoreActionBar() {
ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle(mTitle);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
if (!mNavigationDrawerFragment.isDrawerOpen()) {
// Only show items in the action bar relevant to this screen
// if the drawer is not showing. Otherwise, let the drawer
// decide what to show in the action bar.
getMenuInflater().inflate(R.menu.main, menu);
restoreActionBar();
return true;
}
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
private boolean runOnce = false;
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.form_welcome_screen_fragment, container, false);
return rootView;
}
#Override
public void onStart() {
super.onStart();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction ft = fragmentManager.beginTransaction();
if (ParseUser.getCurrentUser() != null) {
File f = new File(getActivity().getFilesDir() + "/display_store.bin");
if (f.exists() && !f.isDirectory()) {
ft.replace(R.id.container, new Display()).commit();
} else {
ft.replace(R.id.container, new CollectionFragment()).commit();
}
} else {
ft.replace(R.id.container, new Authentication()).commit();
}
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
}
Navigation Drawer Fragment:
import android.app.Activity;
import android.app.ActionBar;
import android.app.Fragment;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
/**
* Fragment used for managing interactions for and presentation of a navigation drawer.
* See the <a href="https://developer.android.com/design/patterns/navigation-drawer.html#Interaction">
* design guidelines</a> for a complete explanation of the behaviors implemented here.
*/
public class NavigationDrawerFragment extends Fragment {
/**
* Remember the position of the selected item.
*/
private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";
/**
* Per the design guidelines, you should show the drawer on launch until the user manually
* expands it. This shared preference tracks this.
*/
private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";
/**
* A pointer to the current callbacks instance (the Activity).
*/
private NavigationDrawerCallbacks mCallbacks;
/**
* Helper component that ties the action bar to the navigation drawer.
*/
private ActionBarDrawerToggle mDrawerToggle;
private DrawerLayout mDrawerLayout;
private ListView mDrawerListView;
private View mFragmentContainerView;
private int mCurrentSelectedPosition = 0;
private boolean mFromSavedInstanceState;
private boolean mUserLearnedDrawer;
public NavigationDrawerFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Read in the flag indicating whether or not the user has demonstrated awareness of the
// drawer. See PREF_USER_LEARNED_DRAWER for details.
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);
if (savedInstanceState != null) {
mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);
mFromSavedInstanceState = true;
}
// Select either the default item (0) or the last selected item.
selectItem(mCurrentSelectedPosition);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
// Indicate that this fragment would like to influence the set of actions in the action bar.
setHasOptionsMenu(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mDrawerListView = (ListView) inflater.inflate(
R.layout.fragment_navigation_drawer, container, false);
mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
});
mDrawerListView.setAdapter(new ArrayAdapter<String>(
getActionBar().getThemedContext(),
android.R.layout.simple_list_item_activated_1,
android.R.id.text1,
new String[]{
getString(R.string.title_section1),
getString(R.string.title_section2),
getString(R.string.title_section3),
getString(R.string.title_section4),
getString(R.string.title_section5),
getString(R.string.title_section6),
}));
mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
return mDrawerListView;
}
public boolean isDrawerOpen() {
return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView);
}
/**
* Users of this fragment must call this method to set up the navigation drawer interactions.
*
* #param fragmentId The android:id of this fragment in its activity's layout.
* #param drawerLayout The DrawerLayout containing this fragment's UI.
*/
public void setUp(int fragmentId, DrawerLayout drawerLayout) {
mFragmentContainerView = getActivity().findViewById(fragmentId);
mDrawerLayout = drawerLayout;
// set a custom shadow that overlays the main content when the drawer opens
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
// set up the drawer's list view with items and click listener
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
// ActionBarDrawerToggle ties together the the proper interactions
// between the navigation drawer and the action bar app icon.
mDrawerToggle = new ActionBarDrawerToggle(
getActivity(), /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */
R.string.navigation_drawer_open, /* "open drawer" description for accessibility */
R.string.navigation_drawer_close /* "close drawer" description for accessibility */
) {
#Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
if (!isAdded()) {
return;
}
getActivity().invalidateOptionsMenu(); // calls onPrepareOptionsMenu()
}
#Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
if (!isAdded()) {
return;
}
if (!mUserLearnedDrawer) {
// The user manually opened the drawer; store this flag to prevent auto-showing
// the navigation drawer automatically in the future.
mUserLearnedDrawer = true;
SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(getActivity());
sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply();
}
getActivity().invalidateOptionsMenu(); // calls onPrepareOptionsMenu()
}
};
// If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer,
// per the navigation drawer design guidelines.
if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
mDrawerLayout.openDrawer(mFragmentContainerView);
}
// Defer code dependent on restoration of previous instance state.
mDrawerLayout.post(new Runnable() {
#Override
public void run() {
mDrawerToggle.syncState();
}
});
mDrawerLayout.setDrawerListener(mDrawerToggle);
}
private void selectItem(int position) {
mCurrentSelectedPosition = position;
if (mDrawerListView != null) {
mDrawerListView.setItemChecked(position, true);
}
if (mDrawerLayout != null) {
mDrawerLayout.closeDrawer(mFragmentContainerView);
}
if (mCallbacks != null) {
mCallbacks.onNavigationDrawerItemSelected(position);
}
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mCallbacks = (NavigationDrawerCallbacks) activity;
} catch (ClassCastException e) {
throw new ClassCastException("Activity must implement NavigationDrawerCallbacks.");
}
}
#Override
public void onDetach() {
super.onDetach();
mCallbacks = null;
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition);
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Forward the new configuration the drawer toggle component.
mDrawerToggle.onConfigurationChanged(newConfig);
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// If the drawer is open, show the global app actions in the action bar. See also
// showGlobalContextActionBar, which controls the top-left area of the action bar.
if (mDrawerLayout != null && isDrawerOpen()) {
inflater.inflate(R.menu.main, menu);
showGlobalContextActionBar();
}
super.onCreateOptionsMenu(menu, inflater);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// if (item.getItemId() == R.id.sort) {
// Toast.makeText(getActivity(), "Example action.", Toast.LENGTH_SHORT).show();
// return true;
// }
return super.onOptionsItemSelected(item);
}
/**
* Per the navigation drawer design guidelines, updates the action bar to show the global app
* 'context', rather than just what's in the current screen.
*/
private void showGlobalContextActionBar() {
ActionBar actionBar = getActionBar();
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setTitle(R.string.app_name);
}
private ActionBar getActionBar() {
return getActivity().getActionBar();
}
/**
* Callbacks interface that all activities using this fragment must implement.
*/
public static interface NavigationDrawerCallbacks {
/**
* Called when an item in the navigation drawer is selected.
*/
void onNavigationDrawerItemSelected(int position);
}
}
Any Help would be much appreciated!!!

Write this in the onCreate(Bundle savedInstanceState) method after you set your drawer up:
mNavigationDrawerFragment.setUp(R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
if (savedInstanceState == null) {
// on first time to display view for first navigation item based on the number
onSectionAttached(2); // 2 is your fragment's number for "CollectionFragment"
}
Notice that your Fragment's number is 2. The number is got from your public void onSectionAttached(int number) method. If case 2: opens the CollectionFragment, so your Fragment's number is 2 (because of case number is 2). Then, alter your onSectionAttached() slightly:
public void onSectionAttached(int number) {
// update the main content by replacing fragments
Fragment fragment = null;
switch (number) {
case 1:
mTitle = "Home";
break;
case 2:
mTitle = "My Information";
fragment = new CollectionFragment();
break;
case 3:
mTitle = "My Display";
fragment = new Display();
break;
case 4:
mTitle = "Donate";
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.google.org"));
startActivity(browserIntent);
break;
case 5:
mTitle = "Settings";
break;
case 6:
mTitle = "Log Out";
ParseUser.logOut();
fragment = new Authentication();
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, fragment).commit();
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}
So now, you just need to call onSectionAttached(your fragment's number); to display your Fragment you want.

To handle the default selection of the fragment in Your MainActivity, you need to do the following:
In the MainActivity
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mNavigationDrawerFragment = (NavigationDrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
int selectedSection = getIntent().getIntExtra(EXTRA_PARAMS_ID, 0);
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout), selectedSection);
mNavigationDrawerFragment.selectItem(selectedSection);
}
#Override
public void onNavigationDrawerItemSelected(int position) {
// update the main content by replacing fragments
// You could switch over different positions to show the right fragment
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, YourFragment.newInstance(position))
.commit();
}
public void onSectionAttached(int position) {
final String[] sections = getResources().getStringArray(R.array.sections);
if (sections.length > position)
mTitle = sections[position];
getSupportActionBar().setTitle(mTitle);
}
In the NavigationDrawerFragment remove the selectItem(mCurrentSelectedPosition); from the onCreate()