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I'm currently learning android, and in my current project I'm using fragment to load the start page.

Here is my FrameLayout:

 <FrameLayout
    android:id="@+id/frame_container"   
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" /><![CDATA[
/>

I use a void in my activity to load the fragment, and here is the code:

private void loadFragment(Fragment fragment) {
    // load fragment
    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
    transaction.replace(R.id.frame_container, fragment);
    transaction.addToBackStack(null);
    transaction.commit();
}

and on oncreate activity, I use this code:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home_activity);

    toolbar = getSupportActionBar();
    toolbar.setTitle("Home");
    loadFragment(new HomeFragment());

    BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
    navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
}

but it seems my app always crashes on startup. Any ideas?

btw sorry for bad english!

Edit: The problem seems on the code transaction.replace()

transaction.replace(R.id.frame_container, fragment);

when I commented it out, my app works, but I can't load a fragment then

Edit 2: here is the cause of my app's crash:

2018-11-07 08:44:44.469 20414-20414/com.example.han.xvit D/AndroidRuntime: Shutting down VM 2018-11-07 08:44:44.470 20414-20414/com.example.han.xvit E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.han.xvit, PID: 20414 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.han.xvit/com.example.han.xvit.home_activity}: java.lang.RuntimeException: com.example.han.xvit.home_activity@a800718 must implement OnFragmentInteractionListener at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2721) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2782) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1521) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:163) at android.app.ActivityThread.main(ActivityThread.java:6228) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794) Caused by: java.lang.RuntimeException: com.example.han.xvit.home_activity@a800718 must implement OnFragmentInteractionListener at com.example.han.xvit.HomeFragment.onAttach(HomeFragment.java:83) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1404) at android.support.v4.app.FragmentTransition.addToFirstInLastOut(FragmentTransition.java:1195) at android.support.v4.app.FragmentTransition.calculateFragments(FragmentTransition.java:1078) at android.support.v4.app.FragmentTransition.startTransitions(FragmentTransition.java:117) at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2408) at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2273) at android.support.v4.app.FragmentManagerImpl.dispatchStateChange(FragmentManager.java:3273) at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:3229) at android.support.v4.app.FragmentController.dispatchActivityCreated(FragmentController.java:201) at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:620) at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:178) at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1249) at android.app.Activity.performStart(Activity.java:6897) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2684) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2782)  at android.app.ActivityThread.-wrap12(ActivityThread.java)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1521)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:163)  at android.app.ActivityThread.main(ActivityThread.java:6228)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)

 

Edit 3: I successfully solved the problem. It seems I am lacking several fragment implementations on my home activity

The solution can be seen at here

Sagar
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ShinyshadoW
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  • Maybe remove `<![CDATA` and `/>` from your XML layout? – Aaron Nov 07 '18 at 00:43
  • Noope, still crashes – ShinyshadoW Nov 07 '18 at 00:48
  • I see, you don't need those anyway. Could you please post the error log too? – Aaron Nov 07 '18 at 01:12
  • what is app:layout_behavior="@string/appbar_scrolling_view_behavior" /><![CDATA[ used for? are you meant to be passing in a string there? Edit: You appear to be trying to add a "Appbar scrolling view behaviour" to a framelayout, i don't believe you require that line of code there, what is it you're trying to achieve with this line? (i might be able to give a better solution to what you want to do) – Brandon Nov 07 '18 at 01:28
  • The problem is, since i compile the app on my phone, there is no error log. The app just crashes, thats it. – ShinyshadoW Nov 07 '18 at 01:36
  • I myself don't know what " app:layout_behavior="@string/appbar_scrolling_view_behavior" /><![CDATA[" is used for. It is automatically generated by android studio. – ShinyshadoW Nov 07 '18 at 01:37
  • `com.example.han.xvit.home_activity@a800718 must implement OnFragmentInteractionListener` – Vladyslav Matviienko Nov 07 '18 at 05:27

1 Answers1

0

First, remove the <![CDATA[/> so the layout becomes like this:

 <FrameLayout
    android:id="@+id/frame_container"   
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

Then, from the following error log:

com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794) Caused by: java.lang.RuntimeException: com.example.han.xvit.home_activity@a800718 must implement OnFragmentInteractionListener at com.example.han.xvit.HomeFragment.onAttach(HomeFragment.java:83) at

it means that you need to implement OnFragmentInteractionListener in your Activity because your HomeFragment needs it. Please check your HomeFragment onAttach.

ישו אוהב אותך
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