Develop Reference

handling the back button to go to HomeFragment?

navigation drawer, handling the back button to go to HomeFragment
This is SecurityFragment
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* A simple {#link Fragment} subclass.
*/
public class SecurityFragment extends Fragment {
public SecurityFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_security, container, false);
}
}
This is the HomeFragment (When onBackPressed i just want the user to be directed to the homepage)current situation is that on onBackPressed the running application is destroyed
package sampleapp.razen.com.sampleapp;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
import android.view.View;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.widget.Toast;
public class Menu extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu);
android.app.Fragment fragment = new MenuFragment(); // create a fragement object
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.mainFrame, fragment);
ft.commit();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
//this the email icon on the home page
#Override
public void onClick(View view) {
String myEmail[]={"john#balloonventures.com"};
Intent sendMail = new Intent(Intent.ACTION_SEND);
sendMail.putExtra(Intent.EXTRA_EMAIL,myEmail);
sendMail.putExtra(Intent.EXTRA_SUBJECT,"(Type your subject)");
sendMail.setType("plain/text");
//incase you have to add something else put here
sendMail.putExtra(Intent.EXTRA_TEXT,"Your phone:+2547");
startActivity(sendMail);
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
//taxi module
public void taxi_id(View view){
Intent timer=new Intent(this,sampleapp.razen.com.sampleapp.Taxi.class);
startActivity(timer);}
//host home module
public void hosthome_id(View view){
Intent timer=new Intent(this,sampleapp.razen.com.sampleapp.MainActivity.class);
startActivity(timer);}
//calling enterprenuers module
public void enter_id(View view){
Intent timer=new Intent(this,sampleapp.razen.com.sampleapp.SectionListView.class);
startActivity(timer);}
//calling UKV/ICV
public void ukvicv_id(View view){
Intent timer=new Intent(this,sampleapp.razen.com.sampleapp.UkvIcv_Home.class);
startActivity(timer);}
public void finacial_id(View view){
Intent finacial=new Intent(this,sampleapp.razen.com.sampleapp.FinacialHomePage.class);
startActivity(finacial);}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
#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);
}
public void displayView(int viewId) {
Fragment fragment = null;
String title = getString(R.string.app_name);
switch (viewId) {
case R.id.nav_12wks_program:
Intent timer=new Intent(this,sampleapp.razen.com.sampleapp.ExpandableListMainActivity.class);
startActivity(timer);
break;
case R.id.nav_emergency_contact:
Intent flow=new Intent(this,sampleapp.razen.com.sampleapp.EmergencyContact.class);
startActivity(flow);
break;
case R.id.nav_survey:
fragment = new SurveyFragment();
title = "Survey";
break;
case R.id.nav_psld:
fragment = new PsldFragment();
title = "Psld";
break;
case R.id.nav_security:
fragment = new SecurityFragment();
title = "All Volunteers Mu";
break;
case R.id.nav_ukv:
fragment = new UkvKiswaFragment();
title = "Ukv's kiswahili";
break;
case R.id.nav_agreement:
fragment = new AgreementFragment();
title = "Agreement ";
break;
case R.id.nav_njoro_geo:
fragment = new GeoNjoroFragment();
title = "Njoro Geography ";
break;
}
if (fragment != null) {
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.mainFrame, fragment);
ft.commit();
}
// set the toolbar title
if (getSupportActionBar() != null) {
getSupportActionBar().setTitle(title);
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
} #SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
displayView(item.getItemId());
return true;
}
}

Add your fragment transection to Fragment Backstack befor commit
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.mainFrame, fragment);
ft.addToBackStack( "tag" );
ft.commit();

Android - Fragment to Main Layout

Good afternoon,
I was following a tutorial to create a drawer menu for Android.
As programmed, came to me the need for when I go into a Fragment Class, wanted on the menu when you press on the Home, back to the Home (MainActivity) and not for another class.
I leave here my code of this project.
MainActivity.java
package pt.projects.bpn.menudrawerproject;
import android.content.res.Configuration;
import android.support.design.widget.NavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
private DrawerLayout mDrawer;
private Toolbar toolbar;
private NavigationView nvDrawer;
private ActionBarDrawerToggle drawerToggle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mDrawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawerToggle = setupDrawerToggle();
mDrawer.addDrawerListener(drawerToggle);
nvDrawer = (NavigationView) findViewById(R.id.nvView);
setupDrawerContent(nvDrawer);
}
#Override
public boolean onOptionsItemSelected(MenuItem item){
if (drawerToggle.onOptionsItemSelected(item)) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
protected void onPostCreate(Bundle savedInstanceState){
super.onPostCreate(savedInstanceState);
drawerToggle.syncState();
}
private ActionBarDrawerToggle setupDrawerToggle() {
return new ActionBarDrawerToggle(this, mDrawer, toolbar, R.string.drawer_open, R.string.drawer_close);
}
private void setupDrawerContent(NavigationView nvDrawer) {
nvDrawer.setNavigationItemSelectedListener(
new NavigationView.OnNavigationItemSelectedListener(){
#Override
public boolean onNavigationItemSelected(MenuItem menuItem){
selectDrawerItem(menuItem);
return true;
}
});
}
private void selectDrawerItem(MenuItem menuItem) {
Fragment fragment = null;
Class fragmentClass;
switch (menuItem.getItemId()){
case R.id.nav_home_fragment:
fragmentClass = null;
break;
case R.id.nav_first_fragment:
fragmentClass = FirstFragment.class;
break;
case R.id.nav_second_fragment:
fragmentClass = SecondFragment.class;
break;
case R.id.nav_third_fragment:
fragmentClass = ThirdFragment.class;
break;
default:
fragmentClass = FirstFragment.class;
}
if(fragmentClass != null) {
try {
fragment = (Fragment) fragmentClass.newInstance();
} catch (Exception e) {
e.printStackTrace();
}
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.flContent, fragment).commit();
}
else {
FragmentManager fragmentManager = getSupportFragmentManager();
for(int i = 0; i < fragmentManager.getFragments().size(); ++i) {
fragmentManager.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
}
}
menuItem.setChecked(true);
setTitle(menuItem.getTitle());
mDrawer.closeDrawers();
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
drawerToggle.onConfigurationChanged(newConfig);
}
}
Can you please clarify me how i can do that?
EDIT
I update the code for the tips from the comments bellow.
Now, the graphic layout take no changes.

how to put tab fragment inside navigation drawer fragment

This is my MainActivity.java. I have an error when I called a tabbed fragment inside it. the error is in the line
fragment = new FriendsFragment();
MainActivity.java
import android.os.Bundle;
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.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.View;
import android.widget.Toast; import info.androidhive.materialdesign.R;
public class MainActivity extends AppCompatActivity implements FragmentDrawer.FragmentDrawerListener {
private static String TAG = MainActivity.class.getSimpleName();
private Toolbar mToolbar;
private FragmentDrawer drawerFragment;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
drawerFragment = (FragmentDrawer)
getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar);
drawerFragment.setDrawerListener(this);
// display the first navigation drawer view on app launch
displayView(0);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, 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_settings) {
return true;
}
if(id == R.id.action_search){
Toast.makeText(getApplicationContext(), "Search action is selected!", Toast.LENGTH_SHORT).show();
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onDrawerItemSelected(View view, int position) {
displayView(position);
}
private void displayView(int position) {
Fragment fragment = null;
String title = getString(R.string.app_name);
switch (position) {
case 0:
fragment = new HomeFragment();
title = getString(R.string.title_home);
break;
case 1:
fragment = new FriendsFragment();
title = getString(R.string.title_friends);
break;
case 2:
fragment = new MessagesFragment();
title = getString(R.string.title_messages);
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.container_body, fragment);
fragmentTransaction.commit();
// set the toolbar title
getSupportActionBar().setTitle(title);
}
}
}
my friendsfragment is extended with appcompatactivity. could you help me how to clear the error. the friendsfragment.java is also attached here
FriendsFragment.java
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import info.androidhive.materialdesign.R;
import info.androidhive.materialdesign.adapter.PagerAdapter;
public class FriendsFragment extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_friends);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setText("Tab 1"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 2"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 3"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
final PagerAdapter adapter = new PagerAdapter
(getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(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) {
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
The error is
Error:(85, 28) error: incompatible types: FriendsFragment cannot be converted to Fragment

Your FriendsFragment cannot be converted to fragment and that is correct because it is not a fragment, it is an activity, instead of extending from AppCompatActivity it should extend from Fragment or FragmentActivity.
This should make it work, happy coding.

Your FriendsFragement is extending AppCompatActivity...
You have to change
public class FriendsFragment extends AppCompatActivity {
to
public class FriendsFragment extends Fragment {
and make other changes is your FriendsFragment accordingly...
**You cant cast Activity to Fragment....

NullPointerException ViewPager SetAdapter

I am adding a tab view or (ViewPager) to my Fragment in an App I am working on.
I want to put the tab view inside the Contact Fragment
I have a Navigation Drawer that opens, and you see list of options...
Home
Services
Contact
Everything you click goes to a fragment
Then in that fragment loads the .XML file, with a corresponding class to program everything inside the .XML file.
I was following an online tutorial [CLICK HERE][3]
Obviously it was over 2 years ago. Android Code has changed since then. I started with a few more errors then what I have now.
I am experiencing an issue with getSupportFragmentManager(), and getActionBar() really confused at this point, all imports are there. It won't recognize those two. Obviously that makes me think well something is missing, but I am not sure what needs to put to allow the compiler to see those needed methods.
I still get Null when the ViewPager setAdapter is set.
All I am trying to accomplish is a tab view, with two tabs for Contact, and Social Media. If I could get a simplistic understanding of what is required for tabs to work properly.
I have already searched questions and they don't exactly touch on my specific issue, and so I am asking for help. Any help is definitely appreciated.
FragmentContact
package com.megliosolutions.bitsnbytes.Fragments;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.megliosolutions.bitsnbytes.MainActivity;
import com.megliosolutions.bitsnbytes.R;
import com.megliosolutions.bitsnbytes.ViewPagerClasses.TabsPagerAdapter;
/**
* Created by Jarvis on 6/21/15.
*/
public class FragmentContact extends Fragment {
private ViewPager viewPager;
TabsPagerAdapter mAdapter;
private ActionBar actionBar;
private String[] tabs = {"Contact", "Social Media"};
public static FragmentContact newInstance(){
FragmentContact fragment = new FragmentContact();
return fragment;
}
public FragmentContact(){};
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_contact, container, false);
LoadTabs(rootView);
return rootView;
}
private void LoadTabs(View rootView) {
FragmentManager fragmentManager = getSupportFragmentManager();
// Initilization
viewPager = (ViewPager) rootView.findViewById(R.id.pager);
actionBar = getActionBar();
mAdapter = new TabsPagerAdapter(fragmentManager);
viewPager.setAdapter(mAdapter);
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Adding Tabs
for (String tab_name : tabs) {
actionBar.addTab(actionBar.newTab().setText(tab_name)
.setTabListener((ActionBar.TabListener) this));
}
}
#Override
public void onAttach(FragmentActivity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(5);
}
}
TabsPagerAdapter
package com.megliosolutions.bitsnbytes.ViewPagerClasses;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.view.View;
/**
* Created by Jarvis on 6/28/15.
*/
public class TabsPagerAdapter extends FragmentPagerAdapter {
public TabsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int index) {
switch (index) {
case 0:
// Contact fragment activity
return new ContactFragment();
case 1:
// Social Media fragment activity
return new SocialMediaFragment();
}
return null;
}
#Override
public int getCount() {
// get item count - equal to number of tabs
return 2;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return false;
}
}
MAINACTIVITY
package com.megliosolutions.bitsnbytes;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
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;
import com.megliosolutions.bitsnbytes.Fragments.FragmentAbout;
import com.megliosolutions.bitsnbytes.Fragments.FragmentContact;
import com.megliosolutions.bitsnbytes.Fragments.FragmentHome;
import com.megliosolutions.bitsnbytes.Fragments.FragmentProducts;
import com.megliosolutions.bitsnbytes.Fragments.FragmentServices;
import com.megliosolutions.bitsnbytes.Fragments.FragmentWarranties;
public class MainActivity 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;
private ActionBarDrawerToggle mDrawerToggle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
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) {
// update the main content by replacing fragments
FragmentManager fragmentManager = getSupportFragmentManager();
if(position == 0) {
fragmentManager.beginTransaction()
.replace(R.id.container, FragmentHome.newInstance())
.commit();
}
else if(position == 1){
fragmentManager.beginTransaction()
.replace(R.id.container, FragmentServices.newInstance())
.commit();
}
else if(position == 2){
fragmentManager.beginTransaction()
.replace(R.id.container, FragmentProducts.newInstance())
.commit();
}
else if(position == 3){
fragmentManager.beginTransaction()
.replace(R.id.container, FragmentWarranties.newInstance())
.commit();
}
else if(position == 4){
fragmentManager.beginTransaction()
.replace(R.id.container, FragmentContact.newInstance())
.commit();
}
else if(position == 5){
fragmentManager.beginTransaction()
.replace(R.id.container, FragmentAbout.newInstance())
.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;
case 5:
mTitle = getString(R.string.title_section5);
break;
case 6:
mTitle = getString(R.string.title_section6);
}
}
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.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();
//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_main, container, false);
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
}
Now there is an issue with the FragmentContact.newInstance() in onNavigationDrawerItemSelected()
06-28 15:35:24.695 11744-11744/com.megliosolutions.bitsnbytes E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.megliosolutions.bitsnbytes, PID: 11744
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.view.ViewPager.setAdapter(android.support.v4.view.PagerAdapter)' on a null object reference
at com.megliosolutions.bitsnbytes.Fragments.FragmentContact.LoadTabs(FragmentContact.java:55)
at com.megliosolutions.bitsnbytes.Fragments.FragmentContact.onCreateView(FragmentContact.java:43)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1789)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:955)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1138)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:740)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1501)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:458)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

from logcat Error its clear ViewPager not exist in R.layout.fragment_contact. Please verify that.

Since I need to refer to the viewPager in which it exists on activity_main.xml not the current fragment, I manage to solve this error:
I added a declaration for a new view referring to the activity where the ViewPager exists as following:
View viewNext = inflater.inflate(R.layout.activity_main, container, false);
Then, I declared the viewPager with regards the above declaration:
viewPager = (ViewPager) viewNext.findViewById(R.id.viewPager);
After that, I set up the adaptor.

Start new Activity with the navigation drawer still able to be accessed

I created a Navigation drawer using the design support library. When I open the Navigation Drawer and click on the Volunteer menu item see image
I want the contents of the Volunteer screen with three tabs below and still able to access the navigation drawer displayed. I've tried implementing that code but the app crashes
I tried to use this example https://guides.codepath.com/android/Fragment-Navigation-Drawer. However the Activity that has the
I have attached the code for the Main Activity :
public class MainActivity extends AppCompatActivity {
private DrawerLayout mDrawerLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final ActionBar ab = getSupportActionBar();
ab.setHomeAsUpIndicator(R.drawable.ic_menu);
ab.setDisplayHomeAsUpEnabled(true);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
if (navigationView != null) {
setupDrawerContent(navigationView);
}
}
private void setupDrawerContent(NavigationView navigationView) {
navigationView.setNavigationItemSelectedListener(
new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
selectDrawerItem(menuItem);
return true;
}
});
}
public void selectDrawerItem(MenuItem menuItem) {
// Create a new fragment and specify the planet to show based on
// position
Fragment fragment = null;
Class fragmentClass;
switch (menuItem.getItemId()) {
case R.id.nav_geotag:
fragmentClass = (Fragment_GeoTag.class);
break;
case R.id.nav_footprint:
fragmentClass = Fragment_Footprint.class;
break;
case R.id.nav_education:
fragmentClass = Fragment_Education.class;
break;
case R.id.nav_rssfeeds:
fragmentClass = SimpleRSSReaderActivity.class;
break;
default:
fragmentClass = HomeActivity.class;
}
try {
fragment = (Fragment) fragmentClass.newInstance();
} catch (Exception e) {
e.printStackTrace();
}
// Insert the fragment by replacing any existing fragment
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.flContent, fragment).commit();
// Highlight the selected item, update the title, and close the drawer
menuItem.setChecked(true);
setTitle(menuItem.getTitle());
mDrawerLayout.closeDrawers();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, 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.
switch (item.getItemId()) {
case android.R.id.home:
mDrawerLayout.openDrawer(GravityCompat.START);
return true;
}
;
//noinspection SimplifiableIfStatement
// if (id == R.id.action_settings) {
// return true;
// }
return super.onOptionsItemSelected(item);
}
public void onDrawerItemSelected(View view, int position) {
displayView(position);
}
private void displayView(int position) {
}
}
The Volunteer Fragment
import android.app.Activity;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.GravityCompat;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import java.util.ArrayList;
import java.util.List;
/**
* Created by s210121629 on 2015-07-01.
*/
public class Fragment_Volunteer extends AppCompatActivity{
private DrawerLayout mDrawerLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profile);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final ActionBar ab = getSupportActionBar();
ab.setHomeAsUpIndicator(R.drawable.ic_menu);
ab.setDisplayHomeAsUpEnabled(true);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
if (navigationView != null) {
setupDrawerContent(navigationView);
}
ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
if (viewPager != null) {
setupViewPager(viewPager);
}
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Here's a Snackbar", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
mDrawerLayout.openDrawer(GravityCompat.START);
return true;
}
return super.onOptionsItemSelected(item);
}
private void setupViewPager(ViewPager viewPager) {
Adapter adapter = new Adapter(getSupportFragmentManager());
adapter.addFragment(new PersonalinfoFragment(),"Personal Info");
adapter.addFragment(new MedicalinfoFragment(), "Medical Info");
adapter.addFragment(new ContactinfoFragment(), "Contact Info");
viewPager.setAdapter(adapter);
}
private void setupDrawerContent(NavigationView navigationView) {
navigationView.setNavigationItemSelectedListener(
new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
menuItem.setChecked(true);
mDrawerLayout.closeDrawers();
return true;
}
});
}
static class Adapter extends FragmentPagerAdapter {
private final List<Fragment> mFragments = new ArrayList<>();
private final List<String> mFragmentTitles = new ArrayList<>();
public Adapter(FragmentManager fm) {
super(fm);
}
public void addFragment(Fragment fragment, String title) {
mFragments.add(fragment);
mFragmentTitles.add(title);
}
#Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
#Override
public int getCount() {
return mFragments.size();
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitles.get(position);
}
}
}
The activity_main layout
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<!--<include layout="#layout/include_list_viewpager"/>-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
layout="#layout/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<FrameLayout
android:id="#+id/flContent"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</LinearLayout>
<android.support.design.widget.NavigationView
android:id="#+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="#layout/nav_header"
app:menu="#menu/drawer_view" />
</android.support.v4.widget.DrawerLayout>
profile activity layout
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/sin"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:fitsSystemWindows="true">
<include layout="#layout/profile_listview_pager"/>
<android.support.design.widget.NavigationView
android:id="#+id/nav_view"
android:layout_height="match_parent"
android:layout_width="wrap_content"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="#layout/nav_header"
app:menu="#menu/drawer_view"/>
</android.support.v4.widget.DrawerLayout>
Logcat:
Process: com.example.s210121629.eama, PID: 3185
java.lang.NullPointerException
at android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:417)
at android.support.v4.app.BackStackRecord.replace(BackStackRecord.java:452)
at android.support.v4.app.BackStackRecord.replace(BackStackRecord.java:444)
at com.example.s210121629.eama.MainActivity.selectDrawerItem(MainActivity.java:108)
at com.example.s210121629.eama.MainActivity$1.onNavigationItemSelected(MainActivity.java:48)
at android.support.design.widget.NavigationView$1.onMenuItemSelected(NavigationView.java:136)
at android.support.v7.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:811)
at android.support.v7.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:153)
at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:958)
at android.support.design.internal.NavigationMenuPresenter.onItemClick(NavigationMenuPresenter.java:179)
at android.widget.AdapterView.performItemClick(AdapterView.java:308)
at android.widget.AbsListView.performItemClick(AbsListView.java:1524)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:3531)
at android.widget.AbsListView$3.run(AbsListView.java:4898)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5586)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
at dalvik.system.NativeStart.main(Native Method)

The Volunteer Fragment is not a Fragment as it extends AppCompatActivity. It should extend Fragment.
In the navigation drawer click listener you then should do something like this:
getSupportFragmentManager().beginTransaction().replace(R.id.frame_container, new Fragment_Volunteer()).commit();

you should use only Activity: "MainActivity"
and when you show "Fragment_Volunteer" on item menu put inside switch case:
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.frame_container, new Fragment_Volunteer())
.commit();
use the code next:
Fragment_Volunteer extends Fragment
finally Fragment not use:
protected void onCreate(Bundle savedInstanceState) {}
the code correct is this:
public class Fragment_Volunteer extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_profile, container, false);
return view;
}
}
I hope to help, sorry for my bad english