As mentioned in my previous question I had some problem with showing Fragments inside a ViewPager after opening another Fragment from one of the Fragments inside the ViewPager.
I somehow managed to resolve the problem by using add() in the FragmentTransaction. Unfortunately this creates another problem:
I am using the ActionBar in my app. When I am selecting the same menu item twice I encounter the same problem as before, it doesn't show any Fragments inside the ViewPager.
Home Activity Code(where action bar on click events are call)
public class HomePageActivity extends SherlockFragmentActivity implements ICallback {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private SherlockActionBarDrawerToggle mDrawerToggle;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] mChampionsMenuItems;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTheme(R.style.Theme_Sherlock);
setContentView(R.layout.activity_home_page);
mTitle = mDrawerTitle = getTitle();
mChampionsMenuItems = getResources().getStringArray(R.array.champions_array);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
mDrawerList.setAdapter(new ArrayAdapter<String>(this, R.layout.drawer_list_item, mChampionsMenuItems));
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setBackgroundDrawable(getResources().getDrawable(R.color.navy_blue));
getSupportActionBar().setDisplayShowTitleEnabled(false);
mDrawerToggle = new SherlockActionBarDrawerToggle(this, mDrawerLayout, R.drawable.menu_icon, R.string.drawer_open, R.string.drawer_close) {
public void onDrawerClosed(View view) {
getSupportActionBar().setTitle(mTitle);
supportInvalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getSupportActionBar().setTitle(mDrawerTitle);
supportInvalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
onFragmentChange(new HomeActivityFragment(), true);
}
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
switch (item.getItemId()) {
default: return super.onOptionsItemSelected(item);
}
}
private class DrawerItemClickListener implements ListView.OnItemClickListener {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
}
private void selectItem(int position) {
switch (position) {
case 0:
onFragmentChange(new Fragment1(), false);
break;
case 1:
onFragmentChange(new Fragment2(), false);
break;
case 2:
onFragmentChange(new MyPointFragment3(), false);
break;
case 3:
// onFragmentChange(new HomeActivityFragment(), true);
break;
case 4:
onFragmentChange(new QueriesFragment(), false);
break;
case 5:
onFragmentChange(new GalleryFragment(), false);
break;
default:
break;
}
mDrawerList.setItemChecked(position, true);
mDrawerLayout.closeDrawer(mDrawerList);
}
#Override
public void setTitle(CharSequence title) {
mTitle = title;
getSupportActionBar().setTitle(mTitle);
}
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
mDrawerToggle.syncState();
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
#Override
public void onFragmentChange(Fragment fragment, boolean flag) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.add(R.id.content_frame, fragment, fragment.getClass().getName());
transaction.commit();
}
}
This is the Fragment which contains the ViewPager:
public class Fragment1 extends Fragment implements OnClickListener {
ICallback callback;
private LinearLayout headerContainer;
private ImageView headerLogo;
private TextView headerName;
private Button menuBarButton;
MyAdapter adapter;
ViewPager pager;
ActionBar actionBar;
private Button progOverview, progStr, bonusPoint;
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
if (activity instanceof ICallback) {
this.callback = (ICallback) activity;
}
actionBar = activity.getActionBar();
actionBar.show();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = setUpView(inflater, container);
return rootView;
}
private View setUpView(LayoutInflater inflater, ViewGroup container) {
View rootView = inflater.inflate(R.layout.fragment_about_champions_club, container, false);
headerContainer = (LinearLayout) rootView.findViewById(R.id.second_top_header);
headerContainer.setBackgroundColor(getResources().getColor(R.color.prog_str_blue));
headerLogo = (ImageView) rootView.findViewById(R.id.header_logo);
headerLogo.setBackgroundResource(R.drawable.about_champions_ticon);
headerName = (TextView) rootView.findViewById(R.id.header_name);
headerName.setText(R.string.about_champ_title);
adapter = new MyAdapter(getFragmentManager());
pager = (ViewPager) rootView.findViewById(R.id.pager);
pager.setAdapter(adapter);
return rootView;
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (savedInstanceState != null) {
// Restore last state for checked position.
}
}
}
}
This is one of the Fragments inside the ViewPager:
public class ProgramOverViewFragment extends Fragment {
ICallback callback;
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
if (activity instanceof ICallback) {
this.callback = (ICallback) activity;
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_program_overview, container, false);
TextView termsAndCond = (TextView) rootView.findViewById(R.id.terms_and_condition_button);
termsAndCond.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.content_frame, fragment);
fragment.setRetainInstance(true);
transaction.addToBackStack(null);
transaction.commit();
}
});
return rootView;
}
}
My FragmentStatePagerAdapter:
public class MyAdapter extends FragmentStatePagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public android.support.v4.app.Fragment getItem(int index) {
switch (index) {
case 0: return new ProgramOverViewFragment();
case 1: return new ProgramStructureFragment();
case 2: return new BonusPointFragment();
}
return null;
}
#Override
public int getCount() {
return 3;
}
}
Thanks for your help!
What do you want to do exactly? Are you trying to replace a Fragment inside the ViewPager? Or are you trying to replace a Fragment inside a Fragment inside the ViewPager? Or are you trying to do something different altogether? I can only give you an accurate solution if you explain what you are trying to do in detail. Anyway here is what I am guessing might be wrong:
I think your problem is that you use the wrong FragmentManager. There are multiple different FragmentManagers, but essentially there are two cases:
You want to add/replace/remove a Fragment from an Activity
You want to add/replace/remove a Fragment from another Fragment
As long as I don't see your layout files I can't be sure which of those two options fits your situation.
Solution if you want to replace a Fragment inside of another Fragment
If you want to perform a FragmentTransaction on a Fragment inside of another Fragment, then you need to use the child FragmentManager! You can use the child FragmentManager inside a Fragment like this:
FragmentManager fragmentManager = getChildFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.content_frame, fragment);
fragment.setRetainInstance(true);
transaction.addToBackStack(null);
transaction.commit();
As you can see you just need to use getChildFragmentManager() instead of getSupportFragmentManager()
As I already said, without any further information about your situation I cannot give you a more accurate answer. So please try to explain what you want to do as best as you can to me and I'm confident we can solve this.
Finally i found what i did wrong in my code :
i'm using this below code for setting adapter for view Pager inside a fragment :
adapter = new MyAdapter(getFragmentManager());
pager = (ViewPager) rootView.findViewById(R.id.pager);
pager.setAdapter(adapter);
and by replacing getFragmentManager() to getChildFragmentManager() we resolve this problem. As per my understanding i'm using view pager inside a fragment that's why i have to use getChildFragment manager to store transitions of my viewPager.
Might this help someone and this question is still open for better solutions.
Related
I have Navigation drawer.and in First fragmant of Navigation drawer there is viewpager and there is information coming from network.Viewpager has 2 fragments also.When I switch fragment to Settings fragment of navigation drawer and coming back to this fragment everything is gone..There is no any information..How can i save state of this fragment?Or in which method can i send request to take information from network again
MainActivity
public class MainActivity extends AppCompatActivity implements
NavigationView.OnNavigationItemSelectedListener {
private DrawerLayout drawer;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.motherFragments, FragmentMainPage.newInstance("MainPage"))
.commit();
}
#Override
public void onBackPressed() {
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) {
switch (item.getItemId()) {
case android.R.id.home: {
drawer.openDrawer(GravityCompat.START);
break;
}
}
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
Fragment fragment = null;
if (item.isChecked()) {
drawer.closeDrawer(GravityCompat.START);
return false;
}
switch (item.getItemId()) {
case R.id.home: {
fragment = new FragmentMainPage().newInstance("Sample");
break;
}
case R.id.settings:{
Intent intent = new Intent(this,SettingsActivity.class);
startActivity(intent);
break;
}
case R.id.incoming:{
fragment = new FragmentIncomingPage().newInstance("Sample");
break;
}
}
if (fragment != null) {
getSupportFragmentManager()
.beginTransaction().replace(R.id.motherFragments, fragment)
.commit();
item.setChecked(true);
}
drawer.closeDrawer(GravityCompat.START);
return true;
} }
Fragment1 of Navigation drawer
public class FragmentMainPage extends Fragment implements
ViewPager.OnPageChangeListener {
private Toolbar toolbar;
private MainActivity activity;
private TabLayout tabLayout;
private ViewPager viewPager;
String[] names = {
"Sample 1",
"Sample 2"
};
private static FragmentMainPage myInstance;
public static FragmentMainPage newInstance(String testString){
Bundle bundle = new Bundle();
bundle.putString("test",testString);
if(myInstance == null){
myInstance = new FragmentMainPage();
}
myInstance.setArguments(bundle);
return myInstance;
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
activity = ((MainActivity) context);
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_fragment_main,container,false);
toolbar = (Toolbar) view.findViewById(R.id.toolbar);
activity.setSupportActionBar(toolbar);
activity.setTitle(getResources().getText(R.string.bosh_sahifa));
activity.getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_menu_white_24dp);
activity.getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) view.findViewById(R.id.viewpager);
setupViewpager(viewPager);
tabLayout = (TabLayout) view.findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
viewPager.addOnPageChangeListener(this);
setupTabName();
return view;
}
private void setupViewpager(ViewPager viewPager) {
MyAdapter adapter = new MyAdapter(getActivity().getSupportFragmentManager());
adapter.addFragement(new Fragment_home1());
adapter.addFragement(new Fragment_home2());
viewPager.setAdapter(adapter);
}
private void setupTabName() {
tabLayout.getTabAt(0).setText(names[0]);
tabLayout.getTabAt(1).setText(names[1]);
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
}
#Override
public void onPageScrollStateChanged(int state) {
}
private class MyAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFragement(Fragment fragment){
mFragmentList.add(fragment);
}
}
}
Fragment 2 of Navigation drawer
public class FragmentIncomingPage extends Fragment {
private Toolbar toolbar;
private MainActivity activity;
private static FragmentIncomingPage myInstance;
public static FragmentIncomingPage newInstance(String testString){
Bundle bundle = new Bundle();
bundle.putString("test",testString);
if(myInstance == null){
myInstance = new FragmentIncomingPage();
}
myInstance.setArguments(bundle);
return myInstance;
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
activity = ((MainActivity) context);
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_fragment_incoming,container,false);
toolbar = (Toolbar) view.findViewById(R.id.toolbar);
activity.setSupportActionBar(toolbar);
activity.setTitle(getResources().getText(R.string.Incoming));
activity.getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_menu_white_24dp);
activity.getSupportActionBar().setDisplayHomeAsUpEnabled(true);
return view;
}
}
Have 3 fragments and swipe to 3rd fragment then back to 1st fragment, the 1st fragment's data is gone?
You can use fragment.addToBackStack(null) method.
like,
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_frame, A);
ft.addToBackStack(null);
ft.commit();
There is few ways to achieve it.
You can use SharedPreferences to save current Fragment by mViewPager.getCurrentItem() and set it again once you come to the ViewPager activity by navigation drawer button.
Use BaseFragment and implement your fragments from the Base Fragment, keep current visible fragment of the view pager in side the Base Fragment as protected variable.
As Base Fragment which is describe above, You can use Bas Activity class.
I have 3 Fragment (Fragment Home, Fragment A, Fragment B and Fragment C). First time app run will display Fragment Home (Set in Mainactivity). From Navigation Draw Item can choose every fragment. Every selected item will display detail Fragment.
I have problems to handle data and retain fragment :
(1). When I select a fragment (for example Fragment A) will show the page of Fragment A. But when I rotate the device, why my fragment back to Fragment Home and not stay at current Fragment ??How to handle it ?
(2). In Fragment B, I show image in GridView. But when I rotate the device, why my fragment back to Fragment Home and not stay at current Fragment ??How to handle it and still display this fragment with existing Data?
This is my code :
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private static final String LOG_TAG = MainActivity.class.getSimpleName();
#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.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
displaySelectedItem(R.id.nav_home);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
displaySelectedItem(item.getItemId());
return true;
}
private void displaySelectedItem (int itemId) {
Fragment fragment = null;
switch (itemId){
case R.id.nav_home:
fragment = new FragmentHome();
break;
case R.id.nav_a:
fragment = new FragmentA();
break;
case R.id.nav_b:
fragment = new FragmentB();
break;
case R.id.nav_c:
fragment = new FragmentC();
break;
case R.id.nav_d:
fragment = new FragmentD();
break;
}
FragmentManager fragmentManager = MainActivity.this.getSupportFragmentManager();
List<Fragment> fragments = fragmentManager.getFragments();
if (fragments != null) {
for(Fragment f : fragments){
fragmentManager.popBackStack();
}
}
//replace the fragment
if (fragment != null) {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.content_frame, fragment, "TAG_FRAGMENT");
fragmentTransaction.commit();
}
DrawerLayout drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
drawerLayout.closeDrawer(GravityCompat.START);
}
Fragment A :
public class FragmentA extends Fragment {
public FragmentA() {
super();
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_a, container, false);
return rootView;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
getActivity().setTitle("Fragment A");
}
}
Fragment B :
public class FragmentB extends Fragment {
private static final String LOG_TAG = FragmentB.class.getSimpleName();
private ImageAdapter imageAdapter;
private ArrayList<Movie> movieList;
public FragmentNowPlaying() {
super();
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_b, container, false);
GridView gridView = (GridView) rootView.findViewById(R.id.gridviewNowPlaying);
imageAdapter = new ImageAdapter(getContext(), R.layout.fragment_b, movieList);
if (savedInstanceState == null) {
movieList = new ArrayList<Movie>();
}else{
movieList = (ArrayList<Movie>) savedInstanceState.get("MovieList");
}
gridView.setAdapter(imageAdapter);
return rootView;
}
#Override
public void onSaveInstanceState(Bundle outState) {
outState.putParcelableArrayList("MovieList",movieList);
super.onSaveInstanceState(outState);
}
Solved this issue. In MainActivity add this :
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition);
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION, 0);
Menu menu = navigationView.getMenu();
menu.getItem(mCurrentSelectedPosition).setChecked(true);
}
In every fragment add condition to check savedInstanceState null or not.
Thanks everybody
You need to override onConfigurationChanged(Configuration newConfig) method in your Fragments A and B to tell them to stay there when the app configuration change. For example:
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// get current fragment
Fragment fragment = mAdapter.getItem(currentItem);
if(fragment!=null){
fragment.onResume();
}
}
Because every time you rotate the screen the onCreate() method is called.
work around
in onCreate() method check whether the savedInstanceState() is null or not
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(null == savedInstanceState){
//set you initial fragment object
}
else
{
//Load the fragment by tag
}
}
and to save the instance state just before onPause() in all fragments
#Override
protected void onSaveInstanceState(Bundle bundle1)
{
super.onSaveInstanceState(bundle1); Log.i(tag,"inside onSaveInstanceState");
bundle1.putInt("tag",n);
}
I've a FrameLayout and Navigation Drawer in Main Activity. I'm transacting a fragment in Main Activity using this FrameLayout. In this fragment, I've TabLayout and ViewPager. Now what I want is to open a new fragment on Button click in the ViewPager fragment. But app crashes on Button click. Is it becuz FrameLayout is in Main Activity and the Button is in child fragment's child fragment? I've tried using FrameLayout in Tabs but that would mean I would have to use FrameLayouts for each Tab and I don't want that. So any help in this regard will be much appreciated. Also, how to handle back arrow click in toolbar to go back to previous fragment?
public class HomeFragment extends Fragment {
public static TabLayout tabLayout;
public static ViewPager viewPager;
public static int int_items = 2;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.homefragment, container, false);
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
tabLayout = (TabLayout) view.findViewById(R.id.tabs);
viewPager = (ViewPager) view.findViewById(R.id.viewpager);
viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));
tabLayout.post(new Runnable() {
#Override
public void run() {
tabLayout.setupWithViewPager(viewPager);
}
});
}
class MyAdapter extends FragmentPagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
/**
* Return fragment with respect to Position .
*/
#Override
public Fragment getItem(int position)
{
switch (position){
case 0 : return new TabOne();
case 1 : return new TabTwo();
}
return null;
}
#Override
public int getCount() {
return int_items;
}
/**
* This method returns the title of the tab according to the position.
*/
#Override
public CharSequence getPageTitle(int position) {
switch (position){
case 0 :
return "ONE";
case 1 :
return "TWO";
}
return null;
}
}
}
public class TabOne extends Fragment {
private Button newFrag;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.tabone, container, false);
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
newFrag = (Button)view.findViewById(R.id.button);
newFrag.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentTransaction xfragmentTransaction = getChildFragmentManager().beginTransaction();
xfragmentTransaction.replace(R.id.containerView, new NewFrag()).addToBackStack(null).commit();
}
});
}
}
public class MainActivity extends AppCompatActivity {
DrawerLayout myDrawerLayout;
NavigationView myNavigationView;
Toolbar toolbar;
ActionBarDrawerToggle mDrawerToggle;
FragmentManager myFragmentManager;
FragmentTransaction myFragmentTransaction;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
myNavigationView = (NavigationView) findViewById(R.id.nav_drawer) ;
myFragmentManager = getSupportFragmentManager();
myFragmentTransaction = myFragmentManager.beginTransaction();
myFragmentTransaction.replace(R.id.containerView, new HomeFragment()).commit();
myNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem selectedMenuItem) {
myDrawerLayout.closeDrawers();
if (selectedMenuItem.getItemId() == R.id.nav_profile) {
FragmentTransaction fragmentTransaction = myFragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.containerView, new ProfileFragment()).addToBackStack(null).commit();
}
if (selectedMenuItem.getItemId() == R.id.nav_history) {
FragmentTransaction xfragmentTransaction = myFragmentManager.beginTransaction();
xfragmentTransaction.replace(R.id.containerView, new HistoryFragment()).addToBackStack(null).commit();
}
return false;
}
});
toolbar = (Toolbar)findViewById(R.id.toolbar);
mDrawerToggle = new ActionBarDrawerToggle(this, myDrawerLayout, toolbar, R.string.app_name, R.string.app_name);
myDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerToggle.syncState();
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
onBackPressed();
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
}
FATAL EXCEPTION: main
Process: com.sam.demonavigation, PID: 8523
java.lang.IllegalArgumentException: No view found for id 0x7f0c006b (com.sam.demonavigation:id/containerView) for fragment HistoryFragment{42016928 #0 id=0x7f0c006b}
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1059)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:742)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:517)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5388)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:655)
at dalvik.system.NativeStart.main(Native Method)
This link proved to be very useful. Using the method mentioned in my link I was able to use the FrameLayout in my Main Activity to open any fragment
// This is the button click event in one of the TabLayout fragment
newFrag.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Fragment var1 = new NewFrag();
((MainActivity)getActivity()).replaceFragment(var1);
}
});
// Add this method in MainActivity
public void replaceFragment(Fragment fragment){
FragmentTransaction t = getSupportFragmentManager().beginTransaction();
t.replace(R.id.containerView, fragment).addToBackStack(null);
t.commit();
}
.
1-Create ViewPager object
ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
viewPager.setOffscreenPageLimit(3);
setupViewPager(viewPager);
2-then add Custom FragmentPagerAdapter
ViewPagerAdapter adapter = new ViewPagerAdapter(this);
adapter.addFrag(new Fragment1(), "Item1");
adapter.addFrag(new Fragment2(), "Item2");
adapter.addFrag(new Fragment3(), "Item3");
viewPager.setAdapter(adapter);
3-After that write custom adapter definition
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
I have a Nav drawer and view pager in an activity.
The problem is the screens overlap. When I click on a different item in the nav drawer, it changes to the appropriate screen but the view pager stays the same. In the view pager getItem(), i would call a fragment with Fragment.newInstance(int index). I tried changing the getItem() method in the view pager to use the same code as the nav drawer and replace the current fragment, however that gives me " java.lang.IllegalStateException: Can't change container ID of fragment". I tried getting rid of the ID of the items by removing the fragment and committing the change. It didn't fix the error.
Any suggestions or help would be greatly appreciated.
public class MainActivity extends FragmentActivity {
private String[] titles;
private ListView drawerList;
private DrawerLayout drawerLayout;
private ActionBarDrawerToggle drawerToggle;
private int currentPosition = 0;
private ShareActionProvider shareActionProvider;`
MyPagerAdapter myPagerAdapter;
ViewPager pager;
private class DrawerItemClickListener implements ListView.OnItemClickListener {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//code to run when the item gets clicked
selectItem(position);
}
}
;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
titles = getResources().getStringArray(R.array.options);
drawerList = (ListView) findViewById(R.id.drawer);
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
myPagerAdapter = new MyPagerAdapter(this.getSupportFragmentManager());
//find view pager
pager = (ViewPager) findViewById(R.id.viewPager);
//set view pager adapter
pager.setAdapter(myPagerAdapter);
//item user clicks on is highlighted
//with simple_list_item_activated_1
drawerList.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_activated_1, titles));
drawerList.setOnItemClickListener(new DrawerItemClickListener());
//if mainactivity is newly created,
//use selectItem() to display HomeFragment
if (savedInstanceState != null) {
currentPosition = savedInstanceState.getInt("position");
setActionBarTitle(currentPosition);
} else {
selectItem(0);
}
//create the actionbarToggle
drawerToggle = new ActionBarDrawerToggle(this, drawerLayout,
R.string.open_drawer, R.string.close_drawer) {
//called when a drawer has settleed in a completely closed state
#Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
invalidateOptionsMenu();
}
#Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
invalidateOptionsMenu();
}
};
drawerLayout.setDrawerListener(drawerToggle);
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
getSupportFragmentManager().addOnBackStackChangedListener(
new FragmentManager.OnBackStackChangedListener() {
#Override
public void onBackStackChanged() {
FragmentManager fragMan = getSupportFragmentManager();
Fragment fragment = fragMan.findFragmentById(R.id.content_frame);
if (fragment instanceof HomeFragment) {
currentPosition = 0;
}
if (fragment instanceof EducationFragment) {
currentPosition = 1;
}
if (fragment instanceof TechnicalSkillsFragment) {
currentPosition = 2;
}
if (fragment instanceof WorkExpFragment) {
currentPosition = 3;
}
setActionBarTitle(currentPosition);
drawerList.setItemChecked(currentPosition, true);
}
}
);
}
private Fragment selectItem(int position) {
//currentPosition for savedInstanceState
currentPosition = position;
Fragment fragment = null;
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
android.support.v4.app.FragmentTransaction ft = fragmentManager.beginTransaction();
if(fragment !=null){
ft.remove(fragment).commit();
fragmentManager.executePendingTransactions();
}
switch (position) {
case 1:
fragment = new EducationFragment();
break;
case 2:
fragment = new TechnicalSkillsFragment();
break;
case 3:
fragment = new WorkExpFragment();
break;
default:
fragment = new HomeFragment();
break;
}
ft.replace(R.id.content_frame, fragment);
ft.addToBackStack(null);
ft.commit();
//set title and close the drawer
if (drawerLayout.isDrawerOpen(drawerList)) {
setActionBarTitle(position);
drawerLayout.closeDrawer(drawerList);
}
return fragment;
}
public class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public android.support.v4.app.Fragment getItem(int position) {
return selectItem(position);
}
#Override
public int getCount() {
return 4;
}
I have a drawer navigationview on the left connects to different fragments with different viewpagers. The structure is as followed.
MainActivity
Drawer NavigationView
| Fragment A -- ViewPagerA ----Tab1 - Fragment1
Tab2 - Fragment2
| Tab3 - Fragment3
| Fragment B -- ViewPagerB ----Tab1 - Fragment4
Tab2 - Fragment5
| Tab3 - Fragment6
Fragment1-6 are list view fragments.
The problem is when I switch from Fragment A to Fragment B, viewpager will cache the content of list view from Fragment1 and try to show the cached content to the adapter of Fragment4. So that it always shows wrong information when the first time I switch fragments from navigation drawer.
My Code:
MainActivity:
public class MainActivity extends Activity {
#InjectView(R.id.navigation_view) public NavigationView mNavigationView;
#InjectView(R.id.drawerLayout) public DrawerLayout mDrawerLayout;
//......Layout injections..............///
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mDrawerToggle = new ActionBarDrawerToggle(this,mDrawerLayout, mToolbar,R.string.app_name,
R.string.app_name){
/** Called when a drawer has settled in a completely closed state. */
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
}
/** Called when a drawer has settled in a completely open state. */
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
}
};
}
public void setUpToggle()
{
mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
// This method will trigger on item Click of navigation menu
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
if (menuItem.isChecked()) menuItem.setChecked(false);
else menuItem.setChecked(true);
//Closing drawer on item click
mDrawerLayout.closeDrawers();
switch (menuItem.getItemId()) {
case R.id.a_drawer:
startFragment(FragmentA.newInstance());
return true;
case R.id.b_drawer:
startFragment(FragmentB.newInstance());
return true;
default:
Toast.makeText(getApplicationContext(),"More things need to be added",Toast.LENGTH_SHORT).show();
return true;
}
}
});
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerToggle.syncState();
}
}
Fragment A/B (Exactly the same structures and layouts)
public class TabFragment extends Fragment {
public static TabLayout tabLayout;
public static ViewPager viewPager;
public static int int_items = n; //n is any positive integer
private Context mContext;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
/**
*Inflate tab_layout and setup Views.
*/
View tabView = inflater.inflate(R.layout.fragment_tab,null);
tabLayout = (TabLayout) tabView.findViewById(R.id.tabs);
viewPager = (ViewPager) tabView.findViewById(R.id.viewpager);
viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));
tabLayout.post(new Runnable() {
#Override
public void run() {
tabLayout.setupWithViewPager(viewPager);
}
});
return tabView;
}
class MyAdapter extends FragmentStatePagerAdapter{
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position)
{
switch (position){
case 0 : return new Fragment1();//or Fragment4 5 6 here
case 1 : return new Fragment2();
case 2 : return new Fragment3();
default:return new Fragment1();
}
}
#Override
public int getCount() {
return int_items;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position){
case 0 :
return "F1";
case 1 :
return "F2";
case 2 :
return "F3";
}
return null;
}
}
Fragment 1 - 6 :
public class TabFocusFragmentextends extends Fragment
implements LoaderManager.LoaderCallbacks<Cursor>
{
private TabFocusAdapter mAdapter;
private List<E> mList;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
loadData();// never been executed,:(
setHasOptionsMenu(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_tab_focus, container, false);
loadData();
setupRecyclerView();
return view;
}
#Override
public void onResume() {
super.onResume();
}
#Override
public void onLoadMore() {
if(NeedLoad)
loadData();
}
private void loadData() {
//RequestData
……
}
private void setupRecyclerView() {
…...
}
#Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
return new CursorLoader(mActivity, ContentProvider.createUri(E.class, null),
null, null, null, null);
}
#Override //fragment starts here, why??
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
if (loadedList.size() > 0) {
//crashes here …...
if (!fullPacketLoaded) {
}
}
#Override
public void onLoaderReset(Loader<Cursor> loader) {
}
If new fragment list adapter doesn't have an appropriate to show previous content, it will crash.
Based on this question, if you have a better solution for the question down below as well? Why is Tablayout and Viewpager crashing with NullpointerException when I start a fragment with LoaderManager from TabFragment?
Finally fixed.
In my onCreate() method of which fragment implemented LoaderManager, I did this
getLoaderManager().initLoader(0, null, this);
if(!getLoaderManager().getLoader(0).isReset()) {
getLoaderManager().restartLoader(0, null, this);
}
It works when new loader was not actived properly.