NullPointerException android.support.v4.app.FragmentManagerImpl.saveFragmentBasicState

Question

Về việc sử dụng Share Ý định App Crashes với Lỗi sau

01-25 12:16:09.270: E/AndroidRuntime(28699): FATAL EXCEPTION: main 
01-25 12:16:09.270: E/AndroidRuntime(28699): java.lang.NullPointerException 
01-25 12:16:09.270: E/AndroidRuntime(28699): at android.support.v4.app.FragmentManagerImpl.saveFragmentBasicState(FragmentManager.java:1576) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at android.support.v4.app.FragmentManagerImpl.saveAllState(FragmentManager.java:1617) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at android.support.v4.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:481) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at com.actionbarsherlock.app.SherlockFragmentActivity.onSaveInstanceState(SherlockFragmentActivity.java:127) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at android.app.Activity.performSaveInstanceState(Activity.java:1113) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1188) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:2805) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at android.app.ActivityThread.handleStopActivity(ActivityThread.java:2863) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at android.app.ActivityThread.access$900(ActivityThread.java:127) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1173) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at android.os.Handler.dispatchMessage(Handler.java:99) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at android.os.Looper.loop(Looper.java:137) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at android.app.ActivityThread.main(ActivityThread.java:4507) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at java.lang.reflect.Method.invokeNative(Native Method) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at java.lang.reflect.Method.invoke(Method.java:511) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 
01-25 12:16:09.270: E/AndroidRuntime(28699): at dalvik.system.NativeStart.main(Native Method) 

PlacesActivity.java

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    switch (item.getItemId()) { 
    case R.id.action_share: 
     // Google Analytics Tracking 
     GATracker.sendEvent("ui_action", "button_press", "share", 
       click_value); 

     shareIt(); 
     break; 
    default: 
     break; 
    } 
    return true; 
} 


private void shareIt() { 
    Intent sharingIntent = new Intent(android.content.Intent.ACTION_SEND); 
    sharingIntent.setType("text/plain"); 

    String shareText = name + "\n" + distance + " kms - " + days + " days" 
      + "\n" + todo + "\n\n" 
      + "Check out Nomad for Android http://goo.gl/i1mH9"; 

    sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, 
      "Check out this!!"); 
    sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, shareText); 
    startActivity(Intent.createChooser(sharingIntent, "Share via")); 
} 

Answer 1

của nó là một lỗi của các loại (hoặc có thể không). nhưng thử folloing: Đối với tất cả các mảnh vỡ, ghi đè lên onSaveInstanceState như sau

@Override 
public void onSaveInstanceState(Bundle outState) 
{ 
//first saving my state, so the bundle wont be empty. 
outState.putString("WORKAROUND_FOR_BUG_19917_KEY", "WORKAROUND_FOR_BUG_19917_VALUE"); 
super.onSaveInstanceState(outState); 
} 

này link có một số cái nhìn sâu sắc hơn

Answer 2

Cố gắng sử dụng FragmentStatePagerAdapter thay vì FragmentPageAdapter. Là một cách tiếp cận tốt hơn nhiều.