Develop Reference

How to go back from Fragment to Fragment?

How I go to the previous fragment when I click on back button.
RecyclerAdapter_1_ten.java
public class RecyclerAdapter_1_ten extends RecyclerView.Adapter<RecyclerAdapter_1_ten.ViewHolder> {
private String[] SubTxt = {"NCERT Solution",
"Notes"};
private int[] SubImage = {R.drawable.ic_answers_black_48dp,
R.drawable.ic_notes_black_48dp};
Activity activity;
public RecyclerAdapter_1_ten(Activity activity) {
this.activity = activity;
}
class ViewHolder extends RecyclerView.ViewHolder {
public int currentItem;
public ImageView itemImage;
public TextView itemTitle;
public ViewHolder(View itemView) {
super(itemView);
itemImage = (ImageView) itemView.findViewById(R.id.SubImage);
itemTitle = (TextView) itemView.findViewById(R.id.SubTxt);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int position = getAdapterPosition();
switch (position) {
case 0:
android.app.FragmentManager fm = activity.getFragmentManager();
fm.beginTransaction().replace(R.id.content_frame, new SecondClass_10()).commit();
case 1:
Snackbar.make(v, "Comming Soon " + position,
Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
}
});
}
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.recycler_1_9, viewGroup, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
#Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {
viewHolder.itemTitle.setText(SubTxt[i]);
viewHolder.itemImage.setImageResource(SubImage[i]);
}
#Override
public int getItemCount() {
return SubTxt.length;
}
}
SecondClass_10.java
public class SecondClass_10 extends Fragment {
RecyclerView recyclerView;
RecyclerView.LayoutManager layoutManager;
RecyclerView.Adapter adapter;
View rootview;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootview = inflater.inflate(R.layout.second_class_10, container, false);
recyclerView = (RecyclerView) rootview.findViewById(R.id.recycler_ten_page_second);
layoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
adapter = new RecyclerAdapter_2_ten();
recyclerView.setAdapter(adapter);
return rootview;
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
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.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
android.app.FragmentManager fm = getFragmentManager();
fm.beginTransaction().replace(R.id.content_frame, new FirstClass_9()).commit();
}
#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 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
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);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
android.app.FragmentManager fn = getFragmentManager();
int id = item.getItemId();
if (id == R.id.nav_9) {
fn.beginTransaction().replace(R.id.content_frame, new FirstClass_9()).commit();
} else if (id == R.id.nav_10) {
fn.beginTransaction().replace(R.id.content_frame, new FirstClass_10()).commit();
} else if (id == R.id.nav_11) {
fn.beginTransaction().replace(R.id.content_frame, new FirstClass_11()).commit();
} else if (id == R.id.nav_12) {
fn.beginTransaction().replace(R.id.content_frame, new FirstClass_12()).commit();
} else if (id == R.id.nav_aboutUs) {
} else if (id == R.id.nav_feedback) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
I follow many Tutorial but I didn't get solution Hope I'll get answer here. I have added recyclerview when I click on it it open fragment but when I click on back button instead of going back it goes to first Page.
How to go back to Fragment from Fragment when I click on Back button?

You can use Stack for holding the fragment instances. When you move to the next fragment push the fragment into the stack and detach it from your activity and in the onbackpressed event pop the fragment and attach it to the activity.

This is one of the best explanation that i came across when i started in SO for fragment navigation i hope it helps clear your understanding of how they work.
Android fragments navigation and backstack

How to open navigationview selected item

I am following this tutorial,i made some changes and i remove tablayout and viewpager,now i am trying to set CheeseListFragment as first item of navigationview but it display nothing,can any one tell me how to achieve that
MainActivity.java
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);
}
// 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.sample_actions, 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 CheeseListFragment(), "Category 1");
adapter.addFragment(new CheeseListFragment(), "Category 2");
adapter.addFragment(new CheeseListFragment(), "Category 3");
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);
}
}
}

You need to do following steps.
Replace android.support.design.widget.TabLayout with FrameLayout in layout/include_list_viewpager.xml
<!--<android.support.design.widget.TabLayout-->
<!--android:id="#+id/tabs"-->
<!--android:layout_width="match_parent"-->
<!--android:layout_height="wrap_content" />-->
<FrameLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/window_background">
</FrameLayout>
Add method showCheeseListFragment() to MainActivity class
private void showCheeseListFragment() {
Fragment fragment = new CheeseListFragment();
getSupportFragmentManager().beginTransaction()
.replace(R.id.container, fragment)
.commit();
}
Call this method at end of onCreate in MainActivity.java
// TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
// tabLayout.setupWithViewPager(viewPager);
showCheeseListFragment();
Cange NavigationView.OnNavigationItemSelectedListener() to
private void setupDrawerContent(NavigationView navigationView) {
navigationView.setNavigationItemSelectedListener(
new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
menuItem.setChecked(true);
mDrawerLayout.closeDrawers();
switch (menuItem.getItemId()) {
case R.id.nav_home:
showCheeseListFragment();
return true;
}
return true;
}
}
);
}

How to add tabs inside navigation drawer, design error or fragment error

How to add a tab inside the Navigation Drawer ? I getting error when I try to add a tabs inside navigation drawer.
Navigation Drawer:
public class MyFitTrackNavActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
FragmentTransaction mFragmentTransaction;
android.support.v4.app.FragmentManager mFragmentManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_fit_track_nav);
FragmentManager fm = getFragmentManager();
fm.beginTransaction().replace(R.id.content_frame,new HomeFragment()).commit();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
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);
}
#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 onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.my_fit_track_nav, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
FragmentManager fm = getFragmentManager();
int id = item.getItemId();
switch (id) {
case R.id.action_settings:
fm.beginTransaction().replace(R.id.content_frame,new SettingFragment()).commit();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
FragmentManager fm = getFragmentManager();
int id = item.getItemId();
if (id == R.id.nav_home)
{
fm.beginTransaction().replace(R.id.content_frame,new HomeFragment()).commit();
}
else if (id == R.id.nav_weight)
{
FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction();
xfragmentTransaction.replace(R.id.content_tab, new WeightFragment()).commit();
}
else if (id == R.id.nav_logout)
{
fm.beginTransaction().replace(R.id.content_frame,new LogoutFragment()).commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
item.setChecked(true);
setTitle(item.getTitle());
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
Tabs:
public class WeightFragment extends Fragment {
public static TabLayout tabLayout;
public static ViewPager viewPager;
public static int int_items = 3 ;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_tab_control, container, false);
tabLayout = (TabLayout)rootView.findViewById(R.id.tablayout);
viewPager = (ViewPager)rootView.findViewById(R.id.viewpager);
viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));
tabLayout.post(new Runnable() {
#Override
public void run() {
tabLayout.setupWithViewPager(viewPager);
}
});
return rootView;
}
class MyAdapter extends FragmentPagerAdapter{
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position)
{
switch (position){
case 0 : return new KeyInWeightF();
case 1 : return new HistoryF();
case 2 : return new AnalysisF();
}
return null;
}
#Override
public int getCount() {
return int_items;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position){
case 0 :
return "Weight";
case 1 :
return "History";
case 2 :
return "Analysis";
}
return null;
}
}
this is onr of the tab fragment in the tab (WeightFragment)
public class KeyInWeightF extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.daily_weight_fragement,null);
}
}
this is my tab design :
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.example.sam.myfittrack.Tabs.WeightFragment">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.design.widget.TabLayout
android:id="#+id/tablayout"
android:layout_width="match_parent"
android:layout_height="19dp"
app:tabMode="fixed"
app:tabGravity="fill"
android:layout_below="#+id/toolbar"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:layout_below="#+id/tablayout"/>
</android.support.design.widget.CoordinatorLayout>
error:
java.lang.NullPointerException
at com.example.sam.myfittrack.MyFitTrackNavActivity.onNavigationItemSelected(MyFitTrackNavActivity.java:118)
at android.support.design.widget.NavigationView$1.onMenuItemSelected(NavigationView.java:150)
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$1.onClick(NavigationMenuPresenter.java:300)
at android.view.View.performClick(View.java:4336)
at android.view.View$PerformClick.run(View.java:17826)
at android.os.Handler.handleCallback(Handler.java:800)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5434)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:852)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:619)
at dalvik.system.NativeStart.main(Native Method)

Not getting Activity Default State after Rotation

I am creating a navigation drawer and every thing is running smoothly: I successfully create it but when I rotate the orientation my current selected fragment automatically attaches to activity after rotation.
I didn't maintain the onSaveInstanceState.
For example: In vertical orientation if I go from
fragmentA -> fragmentB -> fragmentC and rotate the orientation
I am getting fragmentC.
I didn't save the activity state. Result should be fragmentA.
Why is this happening?
BaseFragment.java
public abstract class BaseFragment extends Fragment {
protected static final String ARG_SECTION_NUMBER = "section_number";
abstract public int getFragmentSectionNumber();
}
FragmentA.java
public class FragmentA extends BaseFragment {
public final static String TAG = FragmentA.class.getSimpleName();
public static FragmentA newInstance(int sectionNumber){
FragmentA fragmentA = new FragmentA();
Bundle bundle = new Bundle();
bundle.putInt(ARG_SECTION_NUMBER,sectionNumber);
fragmentA.setArguments(bundle);
return fragmentA;
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
int sectionNumber = getFragmentSectionNumber();
((MainActivity)getActivity()).onSectionAttached(sectionNumber);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.layout_a, null, false);
return root;
}
#Override
public int getFragmentSectionNumber() {
return getArguments().getInt(ARG_SECTION_NUMBER);
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
private FragmentManager fragmentManager;
private ActionBarDrawerToggle toggle;
private DrawerLayout drawer;
private Toolbar toolbar;
private NavigationView navigationView;
private String mTitle;
private int mCurrentPosition;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
drawer.setDrawerListener(toggle);
toggle.syncState();
navigationView = (NavigationView) findViewById(R.id.nav_view);
if (savedInstanceState == null) {
setFragment(FragmentA.newInstance(R.id.a));
} else {
// int id = savedInstanceState.getInt(Constants.SELECTED_NAVIGATION_ID);
// onSectionAttached(id);
}
navigationView.setNavigationItemSelectedListener(this);
}
private void init() {
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
fragmentManager = getSupportFragmentManager();
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
}
private void setFragment(BaseFragment baseFragment) {
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.fragment_container, baseFragment);
transaction.addToBackStack(null);
transaction.commit();
}
#Override
public void onBackPressed() {
/*DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
return;
} else {
super.onBackPressed();
}
if (fragmentManager.getBackStackEntryCount() <= 0) {
super.onBackPressed();
return;
}
BaseFragment baseFragment = (BaseFragment) fragmentManager.getFragments().get(fragmentManager.getBackStackEntryCount() - 1);
if (baseFragment != null) {
mCurrentPosition = baseFragment.getFragmentSectionNumber();
onSectionAttached(mCurrentPosition);
}*/
}
#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
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
switch (id) {
case R.id.a:
if (mCurrentPosition != R.id.a) {
setFragment(FragmentA.newInstance(R.id.a));
item.setChecked(true);
}
break;
case R.id.b:
if (mCurrentPosition != R.id.b) {
setFragment(FragmentB.newInstance(R.id.b));
item.setChecked(true);
}
break;
case R.id.c:
if (mCurrentPosition != R.id.c) {
setFragment(FragmentC.newInstance(R.id.c));
item.setChecked(true);
}
break;
case R.id.d:
if (mCurrentPosition != R.id.d) {
setFragment(FragmentD.newInstance(R.id.d));
item.setChecked(true);
}
break;
case R.id.e:
if (mCurrentPosition != R.id.e) {
setFragment(FragmentE.newInstance(R.id.e));
item.setChecked(true);
}
break;
default:
break;
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
public void onSectionAttached(int number) {
switch (number) {
case R.id.a:
mTitle = "Fragment A";
mCurrentPosition = R.id.a;
break;
case R.id.b:
mTitle = "Fragment B";
mCurrentPosition = R.id.b;
break;
case R.id.c:
mTitle = "Fragment C";
mCurrentPosition = R.id.c;
break;
case R.id.d:
mTitle = "Fragment D";
mCurrentPosition = R.id.d;
break;
case R.id.e:
mTitle = "Fragment E";
mCurrentPosition = R.id.e;
break;
default:
return;
}
if (mTitle != null && getSupportActionBar() != null) {
getSupportActionBar().setTitle(mTitle);
navigationView.getMenu().findItem(mCurrentPosition).setChecked(true);
}
}
private static class Constants {
final static String SELECTED_NAVIGATION_ID = "selected_navigation_id";
}
}

Update an TextView in NavigationDrawer after input from user in previous activity

There is some information that I want to display in the NavigationDrawer. This information is entered by the user in a previous activity. I use an intent to send the information to the Main Activity for the Drawer.
MainActivity (After user entered details)
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);
Intent intent = getIntent();
String info = intent.getStringExtra("info");
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.nav_item_dashboard);
break;
......
}
I have a specific layout for the navigation drawer and it contains a textview which I want to update with the String test. This is the fragment code and the xml for it.
FragmentDrawer Class
public FragmentDrawer() {
}
public void setDrawerListener(FragmentDrawerListener listener) {
this.drawerListener = listener;
}
public static List<NavDrawerItem> getData() {
List<NavDrawerItem> data = new ArrayList<>();
// preparing navigation drawer items
for (int i = 0; i < titles.length; i++) {
NavDrawerItem navItem = new NavDrawerItem();
navItem.setTitle(titles[i]);
navItem.setIcon(icons.getResourceId(i,-1));
data.add(navItem);
}
return data;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// drawer labels
titles = getActivity().getResources().getStringArray(R.array.nav_drawer_labels);
icons = getResources().obtainTypedArray(R.array.nav_drawer_icons);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflating view layout
View layout = inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
recyclerView = (RecyclerView) layout.findViewById(R.id.drawerList);
TextView userID = (TextView) layout.findViewById(R.id.nav_title_user);
adapter = new NavigationDrawerAdapter(getActivity(), getData());
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getActivity(), recyclerView, new ClickListener() {
#Override
public void onClick(View view, int position) {
drawerListener.onDrawerItemSelected(view, position);
mDrawerLayout.closeDrawer(containerView);
}
#Override
public void onLongClick(View view, int position) {
}
}));
return layout;
}
public void setUp(int fragmentId, DrawerLayout drawerLayout, final Toolbar toolbar) {
containerView = getActivity().findViewById(fragmentId);
mDrawerLayout = drawerLayout;
mDrawerToggle = new ActionBarDrawerToggle(getActivity(), drawerLayout, toolbar, R.string.drawer_open, R.string.drawer_close) {
#Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
getActivity().invalidateOptionsMenu();
}
#Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
getActivity().invalidateOptionsMenu();
}
#Override
public void onDrawerSlide(View drawerView, float slideOffset) {
super.onDrawerSlide(drawerView, slideOffset);
toolbar.setAlpha(1 - slideOffset / 2);
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerLayout.post(new Runnable() {
#Override
public void run() {
mDrawerToggle.syncState();
}
});
}
FramgentDrawer.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white">
<RelativeLayout
android:id="#+id/nav_header_container"
android:layout_width="match_parent"
android:layout_height="140dp"
android:layout_alignParentTop="true"
android:background="#color/colorPrimary">
......
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceInverse"
android:text="#string/welcome_user"
android:id="#+id/nav_title_user"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="10dp"/>
</RelativeLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/drawerList"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:layout_below="#id/nav_header_container" />
I have managed to update the list in the drawer with Icons, Labels and a Header. I have done so by using a RecyclerViewAdapter.
The problem that I am having is that these details were from the resources (strings.xml).
How can I update a textview on a NavigationFragment when it has been created? How can I send a value to the fragment so that it will be used during OnCreateView of the fragment?

I was looking too much into it. The solution was quite simple...Even though it took me 3 hrs to figure this out :/
In the NavigationFragment, I created a method to update a textview with a string. In the MainActivity where I get the information from the intent, I just called the method like this:
drawerFragment.setUserTextView(info);
This is why taking breaks are important... ^^