Fragment at android.support.v7

Fragment at android.support.v7 - android

I am new to android, I tried to create a fragment in android support v7 library
and when I wanted to make an object from fragment class and new it with my fragment java it occurred with an error that could not compile type.
MainActivity
public class MainActivity extends AppCompatActivity {
private TextView mTextMessage;
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
mTextMessage.setText(R.string.title_home);
return true;
case R.id.navigation_dashboard:
mTextMessage.setText(R.string.title_dashboard);
return true;
case R.id.navigation_notifications:
mTextMessage.setText(R.string.title_notifications);
return true;
}
return false;
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextMessage = (TextView) findViewById(R.id.message);
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
}
public boolean test(){
Fragment fr = new navigation_page1();
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.fragment_page1,fr);
}
}
error is in this line
Fragment fr = new navigation_page1();
and navigation_page1 is my fragment java code that has been initialized in my main layout with fragment tag.
my main_xml code :
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
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:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.example.aqamamad.myapplication.navigation_page1"
android:id="#+id/fragment_page1"
></fragment>
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="0dp"
android:layout_marginStart="0dp"
android:background="?android:attr/windowBackground"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="#menu/navigation"/>
</android.support.constraint.ConstraintLayout>
my navigation_page1 code :
public class navigation_page1 extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_navigation_page1, container, false);
}}

Problem solved..
go to fragment java class and delete this line --> import android.support.v4.app.Fragment;
and instead of that write this line --> import android.app.Fragment;

Related

How to switch existing fragments when the dialog is closed?

The main screen of the app is for bottom navigation.
And there are 3 menus, all of which are fragments.
Pressing the button on one of the fragments opens the dialog fragment window.
And when the dialog is closed, the old fragment should be switched to another new fragment.
I use show() and hide() instead of replace().
MainAcitivity.java
public class MainActivity extends AppCompatActivity {
BottomNavigationView bottomNav;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bottomNav = findViewById(R.id.bottom_nav);
bottomNav.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
Fragment curFrag = fm.getPrimaryNavigationFragment();
String tag = String.valueOf(item.getItemId());
int id = item.getItemId();
if(curFrag != null) {
transaction.hide(curFrag);
}
Fragment fragment = fm.findFragmentByTag(tag);
if(fragment == null) {
if(id == R.id.list)
fragment = new WorkoutListFragment();
transaction.add(R.id.content_layout, fragment);
}
else {
transaction.show(fragment);
}
transaction.setPrimaryNavigationFragment(fragment);
transaction.setReorderingAllowed(true);
transaction.commitNow();
return true;
}
});
}
// Switch to another fragment when the dialog is closed
public void onFragmentChanged() {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
String tag = "ABC";
Fragment currentFragment = fragmentManager.getPrimaryNavigationFragment();
if (currentFragment != null) {
fragmentTransaction.hide(currentFragment);
}
Fragment fragment = fragmentManager.findFragmentByTag(tag);
if (fragment == null) {
fragment = new WriteRoutineFragment();
fragmentTransaction.add(R.id.container, fragment, tag);
} else {
fragmentTransaction.show(fragment);
}
fragmentTransaction.setPrimaryNavigationFragment(fragment);
fragmentTransaction.setReorderingAllowed(true);
fragmentTransaction.commitNow();
}
}
DialogFragment.java
Button startBtn;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_body_part_dialog, null);
startBtn = view.findViewById(R.id.check);
startBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
MainActivity activity = (MainActivity) getActivity();
activity.onFragmentChanged(); // change fragment
dismiss();
}
});
return view;
}
#NonNull
#Override
public Dialog onCreateDialog(#Nullable Bundle savedInstanceState) {
Dialog dialog = super.onCreateDialog(savedInstanceState);
dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
dialog.setCanceledOnTouchOutside(false);
return dialog;
}
}
WriteRoutineFragment.java
public class WriteRoutineFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_write_routine, container, false);
return rootView;
}
}
ERROR
java.lang.IllegalArgumentException: No view found for id 0x7f0a0082 (com.example.writeweight:id/container) for fragment WriteRoutineFragment{f3a9b6 (137e8e27-12af-4e5a-9397-2cbdc80ed980) id=0x7f0a0082 ABC}
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:875)
at androidx.fragment.app.FragmentManagerImpl.addAddedFragments(FragmentManagerImpl.java:2100)
at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1874)
at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1830)
at androidx.fragment.app.FragmentManagerImpl.execSingleAction(FragmentManagerImpl.java:1696)
at androidx.fragment.app.BackStackRecord.commitNow(BackStackRecord.java:293)
at com.example.writeweight.activity.MainActivity.onFragmentChanged(MainActivity.java:78)
at com.example.writeweight.fragment.BodyPartDialogFragment$2.onClick(BodyPartDialogFragment.java:89)
at android.view.View.performClick(View.java:8160)
at android.widget.TextView.performClick(TextView.java:16221)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:992)
at android.view.View.performClickInternal(View.java:8137)
at android.view.View.access$3700(View.java:888)
at android.view.View$PerformClick.run(View.java:30236)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:246)
at android.app.ActivityThread.main(ActivityThread.java:8506)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)
I/Process: Sending signal. PID: 23516 SIG: 9
ADDED
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
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"
tools:context=".activity.MainActivity">
<FrameLayout
android:id="#+id/content_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toTopOf="#id/bottom_nav"/>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bottom_nav"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="?android:attr/windowBackground"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="#menu/bottom_nav_menu"/>
</androidx.constraintlayout.widget.ConstraintLayout>
fragment_write_routine.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".fragment.WriteRoutineFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/hello_blank_fragment" />
</FrameLayout>

When you say
fragmentTransaction.add(R.id.container, fragment, tag);
What you're saying is that you want the FragmentManager to find the R.id.container in your layout and add your fragment to that container. As you're using getSupportFragmentManager(), you're using the Activity's FragmentManager and hence, R.id.container needs to be in your activity's layout. However, R.id.container isn't in your activity's layout, which is why you're getting an exception.
Instead, you should be using the container that is in your Activity's layout - R.id.content_layout:
fragmentTransaction.add(R.id.content_layout, fragment, tag);

ViewPager inside Fragment doest show content

im developing an android app which has a bottomnavigation that opens 3 different fragments without a viewpager. One fragment has a viewpager inside it which opens 2 fragments. these 2 fragments are the same fragment and each has a recyclerview inside it. my problem is that when I run the app everything except the viewpager runs as intended. I tried putting the fragment inside the viewpager instead of it and the fragment works. I even tried putting the viewpager in a empty activity which worked as well.
This is my MainActivity which holds the BottomNavigation and its functionality:
public class MainActivity extends AppCompatActivity implements BottomNavigationView.OnNavigationItemSelectedListener {
private androidx.appcompat.widget.Toolbar toolbar;
private BottomNavigationView navView;
private Fragment fragment1 = new HomeFragment();
private Fragment fragment2 = new SearchFragment();
private Fragment fragment3 = new SettingsFragment();
private FragmentManager fm = getSupportFragmentManager();
private Fragment active = fragment1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = findViewById(R.id.action_bar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle("Home");
fm.beginTransaction().add(R.id.main_container, fragment3, "settings").hide(fragment3).commit();
fm.beginTransaction().add(R.id.main_container, fragment2, "search").hide(fragment2).commit();
fm.beginTransaction().add(R.id.main_container, fragment1, "home").commit();
navView = findViewById(R.id.nav_view);
navView.setOnNavigationItemSelectedListener(this);
}
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem menuItem) {
switch (menuItem.getItemId()) {
case R.id.navigation_home:
fm.beginTransaction().hide(active).show(fragment1).addToBackStack("home").commit();
active = fragment1;
toolbar.setTitle("Home");
return true;
case R.id.navigation_search:
fm.beginTransaction().hide(active).show(fragment2).addToBackStack("search").commit();
active = fragment2;
toolbar.setTitle("Search");
return true;
case R.id.navigation_settings:
fm.beginTransaction().hide(active)
.show(fragment3).addToBackStack("settings").commit();
active = fragment3;
toolbar.setTitle("Settings");
return true;
}
return false;
}
public void setCurrentPage(Fragment fragment, int position) {
if(fm.findFragmentByTag("playlist"+position) != null){
fm.beginTransaction().remove(fragment).hide(active).add(R.id.main_container, fragment, "playlist"+position).addToBackStack(null).commit();
active = fragment;
} else {
fm.beginTransaction().hide(active).add(R.id.main_container, fragment, "playlist"+position).addToBackStack(null).commit();
active = fragment;
}
}
}
This is the MainActivityLayout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
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"
tools:context=".MainActivity">
<include
layout="#layout/action_bar"
android:id="#+id/action_bar"/>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="56dp"
android:layout_marginBottom="70dp"
android:id="#+id/main_container_parent">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:id="#+id/main_container"/>
</androidx.core.widget.NestedScrollView>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/nav_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:attr/windowBackground"
android:layout_alignParentBottom="true"
app:menu="#menu/bottom_nav_menu"
app:itemTextColor="#color/bottom_nav_color"
app:itemIconTint="#color/bottom_nav_color"
android:elevation="20dp"/>
</RelativeLayout>
This is my Fragment that implements the ViewPager:
public class HomeFragment extends Fragment {
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_home, container, false);
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
PlaylistsPagerAdapter playlistsPagerAdapter = new PlaylistsPagerAdapter(getChildFragmentManager());
playlistsPagerAdapter.addFragment(new PlaylistsFragment(),"private");
playlistsPagerAdapter.addFragment(new PlaylistsFragment(),"public");
ViewPager viewPager = view.findViewById(R.id.pager_home);
viewPager.setAdapter(playlistsPagerAdapter);
TabLayout tabLayout = view.findViewById(R.id.tab_layout_home);
tabLayout.setupWithViewPager(viewPager);
setHasOptionsMenu(false);
}
public class PlaylistsPagerAdapter extends FragmentStatePagerAdapter {
ArrayList<Fragment> mFragmentList = new ArrayList<>();
ArrayList<String> mFragmentListTitle = new ArrayList<>();
public void addFragment(Fragment playlistsFragment, String title) {
mFragmentListTitle.add(title);
mFragmentList.add(playlistsFragment);
}
public PlaylistsPagerAdapter(FragmentManager fm) {
super(fm);
}
#NonNull
#Override
public Fragment getItem(int i) {
return mFragmentList.get(i);
}
#Override
public int getCount() {
return mFragmentList.size();
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentListTitle.get(position);
}
}
}
This is the HomeFragmentLayout:
<?xml version="1.0" encoding="utf-8"?>
<androidx.viewpager.widget.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/pager_home"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.tabs.TabLayout
android:id="#+id/tab_layout_home"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</androidx.viewpager.widget.ViewPager>
This is the PlaylistsFragment:
public class PlaylistsFragment extends Fragment {
private static final String TAG = "PlaylistsFragment";
private ArrayList<String> mPlaylistName = new ArrayList<>();
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_playlists, container, false);
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
initNameBitmap(view);
}
private void initNameBitmap(View view){
mPlaylistName.add("Playlist1");
mPlaylistName.add("Playlist2");
mPlaylistName.add("Playlist3");
mPlaylistName.add("Playlist4");
initRecyclerView(view);
}
private void initRecyclerView(View view){
RecyclerView recyclerView = view.findViewById(R.id.recycler_view_playlists);
RecyclerViewAdapterPlaylists recyclerViewAdapterPlaylists = new RecyclerViewAdapterPlaylists(mPlaylistName, view.getContext(),this);
recyclerView.setAdapter(recyclerViewAdapterPlaylists);
recyclerView.setLayoutManager(new LinearLayoutManager(getView().getContext()));
}
}
This is the PlaylistsFragments Layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/recycler_view_playlists"
android:layout_margin="10dp" />
</LinearLayout>
The weird thing is that it worked already. I tried around with onBackPressed and when i implemented this and pressed another View on the BottomNavigation than the back button on the phone and than the Home button it showed as intened:
fm.beginTransaction().hide(active).show(fragmentsHistory.get(fragmentsHistory.size()-1));
active = fragmentsHistory.get(fragmentsHistory.size()-1)
fragmentsHistory.remove(fragmentsHistory.size()-1);
What am I doing wrong?
Appreciate the help!

i think the problem is in your layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
tools:context=".ui.plans.PlansFragment">
<com.google.android.material.tabs.TabLayout
android:id="#+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimaryDark"
app:tabSelectedTextColor="#color/white"
app:tabTextColor="#DBD8D8" />
<androidx.viewpager.widget.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
your HomeFragmentLayout should be similar to this

Implement Bottom Navigation View into a fragment

In my Android Studio project I want to implement into the MainActivity a NavigationDrawer with fragments and on every fragments a bottom navigation view.
This is the code of one fragment:
public class U16 extends Fragment{
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
getActivity().setTitle("TITOLO U16");
}
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
switch (item.getItemId()) {
case R.id.navigation_home:
fragmentTransaction.replace(R.id.content, new Calendario()).commit();
return true;
case R.id.navigation_dashboard:
fragmentTransaction.replace(R.id.content, new Palestre()).commit();
return true;
case R.id.navigation_notifications:
fragmentTransaction.replace(R.id.content, new Squadra()).commit();
return true;
}
return false;
}
};
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
BottomNavigationView navigation = (BottomNavigationView) getActivity().findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.content, new Calendario()).commit();
return inflater.inflate(R.layout.u16_layout, container, false);
}
}
I get this error:
FATAL EXCEPTION: main
Process: app.navigationdrawerfragment, PID: 21499
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.design.widget.BottomNavigationView.setOnNavigationItemSelectedListener(android.support.design.widget.BottomNavigationView$OnNavigationItemSelectedListener)' on a null object reference at app.navigationdrawerfragment.U16.onCreateView(U16.java:52)
I know that this error in into the procedure "OnCreateView" doing " navigation.setOnNavigationItemSelectedListener..."
This is the u16_layout.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="simone.biliato.navigationdrawerfragment.MainActivity">
<FrameLayout
android:id="#+id/content"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
</FrameLayout>
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="?android:attr/windowBackground"
app:menu="#menu/navigation" />
</LinearLayout>
So, anyone tried to do the same?

You are trying do set someone that is isn't already created.
So move the code into the event onViewCreated, like this:
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
getActivity().setTitle("Titolo");
BottomNavigationView navigation = (BottomNavigationView) getActivity().findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.content, new Calendario()).commit();
return inflater.inflate(R.layout.u16_layout, container, false);
}
This will work :)

How to add Fragment into Activity in Android

I want add 2 fragment into activity, and when click on button switch between this fragments!
I want show Fragment_1 for by default in activity (my mean is : when running activity, show fragment_1) and when click on button switch between fragment_2 and fragment_1 !
I write below codes, and when running activity show fragment_1 but when click on button for switch between fragments, show me Force Close error.
FC error :
08-27 14:15:41.363 14224-14224/com.mohammad.nouri.diaryday E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.mohammad.nouri.diaryday, PID: 14224
java.lang.IllegalStateException: commit already called
at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:641)
at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:621)
at com.mohammad.nouri.diaryday.Activities.LoginActivity$1.onClick(LoginActivity.java:58)
at android.view.View.performClick(View.java:4764)
at android.view.View$PerformClick.run(View.java:19844)
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:5349)
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:908)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)
Activity codes:
public class LoginActivity extends AppCompatActivity {
private Context context;
private boolean status = false;
FragmentTransaction fT;
FragmentManager fM;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
context = this;
Glide.with(this).load(R.drawable.login_header_image)
.bitmapTransform(new BlurTransformation(context, 20))
.into((ImageView) findViewById(R.id.login_background));
fM = getSupportFragmentManager();
fT = fM.beginTransaction();
if (!status) {
LoginFragment f1 = new LoginFragment();
fT.add(R.id.login_cardView, f1);
fT.commit();
status = true;
}
FloatingActionButton f = (FloatingActionButton) findViewById(R.id.login_registerButton);
f.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (!status) {
RegisterFragment f1 = new RegisterFragment();
fT.add(R.id.login_cardView, f1);
fT.commit();
status = true;
}else {
LoginFragment f2 = new LoginFragment();
fT.add(R.id.login_cardView, f2);
fT.commit();
status = false;
}
}
});
}
}
How can I fix it ? Thanks all <3

You only call commit() once in a FragmentTransaction which you already do in the onCreate(). So, just create a new FragmentTransaction within your fab:
FloatingActionButton f = (FloatingActionButton) findViewById(R.id.login_registerButton);
f.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (!status) {
RegisterFragment f1 = new RegisterFragment();
fM.beginTransaction().add(R.id.login_cardView, f1)
.commit();
status = true;
}else {
LoginFragment f2 = new LoginFragment();
fM.beginTransaction().add(R.id.login_cardView, f2)
.commit();
status = false;
}
}
});

Instead of adding the fragments try replacing because you have already added once above.
MainActivity.java
public class MainActivity extends AppCompatActivity {
Button btnFragment;
LinearLayout fragmentContainer;
boolean toggleFlag = false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragmentContainer = (LinearLayout) findViewById(R.id.fragment_container);
FragmentA fragmentA = new FragmentA();
final FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragmentA);
fragmentTransaction.commit();
btnFragment = (Button) findViewById(R.id.btn_fragment);
btnFragment.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(toggleFlag) {
FragmentA fragmentA = new FragmentA();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragmentA);
fragmentTransaction.commit();
} else {
FragmentB fragmentB = new FragmentB();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragmentB);
fragmentTransaction.commit();
}
toggleFlag = !toggleFlag;
}
});
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="#+id/btn_fragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Toggle Fragment" />
</LinearLayout>
<LinearLayout
android:id="#+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
</LinearLayout>
</LinearLayout>
FragmentA.java
public class FragmentA extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootview = inflater.inflate(R.layout.layout_fragment_a, null);
return rootview;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
}
layout_fragment_a.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="#+id/picture"
android:layout_width="50dp"
android:layout_height="50dp"
android:src="#mipmap/ic_launcher"/>
<TextView
android:id="#+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Demo Fragment A"
android:textColor="#android:color/black"/>
</LinearLayout>
FragmentB.java
public class FragmentB extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootview = inflater.inflate(R.layout.layout_fragment_b, null);
return rootview;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
}
layout_fragment_b.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="#+id/picture"
android:layout_width="50dp"
android:layout_height="50dp"
android:src="#mipmap/ic_launcher"/>
<TextView
android:id="#+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Demo Fragment B"
android:textColor="#android:color/black"/>
</LinearLayout>

use this method to call fragment
rplaceFragment(Fragment fragment , int id){
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(id, fragment);
fragmentTransaction.commit();
}

How to change entire layout with fragments?

I am trying to change the layout, or inflate the layout, of the main activity to the About activity when one of the items is clicked in the navigation drawer.
This is how my main activity looks
public class MainActivity extends ActionBarActivity implements
NavigationDrawerFragment.NavigationDrawerCallbacks {
private NavigationDrawerFragment mNavigationDrawerFragment;
private CharSequence mTitle;
#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();
fragmentManager
.beginTransaction()
.replace(R.id.container,
PlaceholderFragment.newInstance(position + 1)).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;
}
}
public void restoreActionBar() {
ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle(mTitle);
}
public static class PlaceholderFragment extends Fragment {
private static final String ARG_SECTION_NUMBER = "section_number";
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment holderFragment = new PlaceholderFragment();
Bundle bundle = new Bundle();
switch (sectionNumber) {
case 1:
bundle.putInt(ARG_SECTION_NUMBER, 05);
break;
case 2:
fragment = new About();
bundle.putInt(ARG_SECTION_NUMBER, 16);
break;
case 3:
bundle.putInt(ARG_SECTION_NUMBER, 1991);
break;
}
holderFragment.setArguments(bundle);
return holderFragment;
}
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
TextView textView = (TextView) rootView
.findViewById(R.id.section_label);
textView.setText(Integer.toString(getArguments().getInt(
ARG_SECTION_NUMBER)));
return rootView;
}
}
}
my main activity .xml looks like this
<!--
As the main content view, the view below consumes the entire
space available using match_parent in both dimensions.
-->
<FrameLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<!--
android:layout_gravity="start" tells DrawerLayout to treat
this as a sliding drawer on the left side for left-to-right
languages and on the right side for right-to-left languages.
If you're not building against API 17 or higher, use
android:layout_gravity="left" instead.
-->
<!--
The drawer is given a fixed width in dp and extends the full height of
the container.
-->
<fragment
android:id="#+id/navigation_drawer"
android:name="com.projectname.NavigationDrawerFragment"
android:layout_width="#dimen/navigation_drawer_width"
android:layout_height="match_parent"
android:layout_gravity="start" />
I have a fragment_about.xml
and this is how the about class looks.
public class About extends Fragment {
public About(){}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_about, container, false);
return rootView;
}
}
this is how my fragment_main.xml looks like
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.projectname.MainActivity$PlaceholderFragment">
<TextView
android:id="#+id/section_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<fragment
android:id="#+id/fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</RelativeLayout>
the navigation drawer works fine but it only changes a text view, i cant figure out how to change the entire layout from the main activity to the about activity on the click of an item in the drawer.
i Just don't know what to do, every time i do something i get an error.

First of all you should extend the FragmentActivity class by your MainActivity. Then in NavigationDrawer click listener do this:
RelativeLayout l = (RelativeLayout) findViewById(R.id.container);
FragmentManager manager = getSupportFragmentManager();
About fragment = new About();
transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container, fragment);
transaction.commit();
And remove from fragment_main (if you not gonna use next like one deeper fragment).

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Fragment at android.support.v7 - android

Problem solved.. go to fragment java class and delete this line --> import android.support.v4.app.Fragment; and instead of that write this line --> import android.app.Fragment;

Related

How to switch existing fragments when the dialog is closed?

ViewPager inside Fragment doest show content

Implement Bottom Navigation View into a fragment

How to add Fragment into Activity in Android

How to change entire layout with fragments?

Categories

Resources