App stürzt onCreateOptionsMenu (vielleicht)

Question

Lassen Sie mich sagen, bevor ich dieses Problem konfrontiert hatte ich fast mein ganzes Projekt, hatte Fehler für ein paar Tage und löste sie schließlich. Meine Android-App ist jetzt fast in Ordnung, außer dass jedes Mal, wenn ich auf das Menü Optionen klicke (in JEDER Aktivität, nicht nur diese hier), stürzt es unerwartet mit einer seltsamen Nachricht ab, die KEINEN Bezug auf meinen Code herstellt.

Hier ist der Stack-Trace:

12-28 22:15:07.842 11672-11672/com.cats.timemanager E/AndroidRuntime: FATAL EXCEPTION: main 
                    Process: com.cats.timemanager, PID: 11672 
                    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference 
                     at android.support.v7.view.menu.ListMenuItemView.setTitle(ListMenuItemView.java:127) 
                     at android.support.v7.view.menu.ListMenuItemView.initialize(ListMenuItemView.java:113) 
                     at android.support.v7.view.menu.MenuAdapter.getView(MenuAdapter.java:100) 
                     at android.support.v7.view.menu.MenuPopup.measureIndividualMenuWidth(MenuPopup.java:160) 
                     at android.support.v7.view.menu.StandardMenuPopup.tryShow(StandardMenuPopup.java:153) 
                     at android.support.v7.view.menu.StandardMenuPopup.show(StandardMenuPopup.java:187) 
                     at android.support.v7.view.menu.MenuPopupHelper.showPopup(MenuPopupHelper.java:290) 
                     at android.support.v7.view.menu.MenuPopupHelper.tryShow(MenuPopupHelper.java:175) 
                     at android.support.v7.widget.ActionMenuPresenter$OpenOverflowRunnable.run(ActionMenuPresenter.java:803) 
                     at android.os.Handler.handleCallback(Handler.java:789) 
                     at android.os.Handler.dispatchMessage(Handler.java:98) 
                     at android.os.Looper.loop(Looper.java:164) 
                     at android.app.ActivityThread.main(ActivityThread.java:6541) 
                     at java.lang.reflect.Method.invoke(Native Method) 
                     at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) 
                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767) 

Es sieht genauso aus wie meine app ohne Grund abstürzt. Hier ist mein Code:

package com.cats.timemanager.activities; 
//Cannot write imports here sorry, StackOverflow editor sucks 

public class MainActivity extends AppCompatActivity { 
/** 
* The {@link android.support.v4.view.PagerAdapter} that will provide 
* fragments for each of the sections. We use a 
* {@link FragmentPagerAdapter} derivative, which will keep every 
* loaded fragment in memory. If this becomes too memory intensive, it 
* may be best to switch to a 
* {@link android.support.v4.app.FragmentStatePagerAdapter}. 
*/ 
private SectionsPagerAdapter mSectionsPagerAdapter; 

/** 
* The {@link ViewPager} that will host the section contents. 
*/ 
private ViewPager mViewPager; 

AppSettingsData myAppSettingsData; 

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

    myAppSettingsData = new AppSettingsData(getApplicationContext()); 
    if (myAppSettingsData.getBoolean("first_start", true)) { 
     Intent tempIntent = new Intent(getBaseContext(), IntroActivity.class); 
     startActivity(tempIntent); 
    } 

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
    mViewPager = (ViewPager) findViewById(R.id.container); 

    setSupportActionBar(toolbar); 
    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); 
    mViewPager.setAdapter(mSectionsPagerAdapter); 
    mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { 
     @Override 
     public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { 

     } 

     @Override 
     public void onPageSelected(int position) { 
      setTitle(mSectionsPagerAdapter.getPageTitle(position)); 
     } 

     @Override 
     public void onPageScrollStateChanged(int state) { 

     } 
    }); 
    setTitle(mSectionsPagerAdapter.getPageTitle(0)); 


    /** 
    * TODO find out sth else to check whether the service is on 
    */ 
    if (isServiceRunning(ScreenService.class) == false) { 
     Intent intentScreenService = new Intent(getApplicationContext(), ScreenService.class); 
     intentScreenService.putExtra("EVENT", 1); 
     getApplicationContext().startService(intentScreenService); 
    } 


    fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Intent myIntent = new Intent(getBaseContext(), ApplicationStatisticsActivity.class); 
      startActivity(myIntent); 
     } 
    }); 
} 


@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_activity_menu, menu); 
    Log.i("CATs", "THIS LOG APPEARS-> THE APP IS WORKING FINE TILL NOW."); 
    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.main_activity_action_settings) { 
     Intent myIntent = new Intent(getBaseContext(), SettingsActivity.class); 
     startActivity(myIntent); 
     return true; 
    } 
    if (id == R.id.main_activity_action_per_app_statistics) { 
     Intent myIntent = new Intent(getBaseContext(), ApplicationStatisticsActivity.class); 
     startActivity(myIntent); 
     return true; 
    } 
    if (id == R.id.main_activity_action_timeline) { 
     Intent myIntent = new Intent(getBaseContext(), TimeLineActivity.class); 
     startActivity(myIntent); 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 

/** 
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to 
* one of the sections/tabs/pages. 
*/ 
public class SectionsPagerAdapter extends FragmentPagerAdapter { 

    public SectionsPagerAdapter(FragmentManager fm) { 
     super(fm); 
    } 

    @Override 
    public Fragment getItem(int position) { 
     // getItem is called to instantiate the fragment for the given page. 
     // Return a ApplicationStatisticsFragment (defined as a static inner class below). 
     switch (position+1) { 
      case 1: 
       return DailyFragment.newInstance(position + 1); 
      case 2: 
       return WeeklyFragment.newInstance(position + 1); 
      case 3: 
       return MonthlyFragment.newInstance(position + 1); 
      case 4: 
       return YearlyFragment.newInstance(position + 1); 
     } 
     return null; 
    } 

    @Override 
    public int getCount() { 
     // Show 4 total pages. 
     return 4; 
    } 

    @Override 
    public CharSequence getPageTitle(int position) { 
     switch (position+1) { 
      case 1: 
       return "Usage stats - Today"; 
      case 2: 
       return "Usage stats - This Week"; 
      case 3: 
       return "Usage stats - This Month"; 
      case 4: 
       return "Usage stats - This Year"; 
     } 
     return null; 
    } 
} 

private boolean isServiceRunning(Class<?> serviceClass) { 
    ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE); 
    for (ActivityManager.RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) { 
     if (serviceClass.getName().equals(service.service.getClassName())) { 
      return true; 
     } 
    } 
    return false; 
} 
} 

Hier ist der wichtigste Teil davon:

@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_activity_menu, menu); 
    Log.i("CATs", "THIS LOG APPEARS-> THE APP IS WORKING FINE TILL NOW."); 
    //THE APP IS WORKING FINE TILL HERE. PROBABLY onCreateOptionsMenu is NOT THE PROBLEM. 
    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.main_activity_action_settings) { 
     Intent myIntent = new Intent(getBaseContext(), SettingsActivity.class); 
     startActivity(myIntent); 
     return true; 
    } 
    if (id == R.id.main_activity_action_per_app_statistics) { 
     Intent myIntent = new Intent(getBaseContext(), ApplicationStatisticsActivity.class); 
     startActivity(myIntent); 
     return true; 
    } 
    if (id == R.id.main_activity_action_timeline) { 
     Intent myIntent = new Intent(getBaseContext(), TimeLineActivity.class); 
     startActivity(myIntent); 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 

hier main_activity_menu.xml:

<menu xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
tools:context="com.cats.timemanager.activities.MainActivity"> 
<item 
    android:id="@+id/main_activity_action_per_app_statistics" 
    android:orderInCategory="100" 
    android:title="@string/main_activity_action_per_app_statistics" /> 
<item 
    android:id="@+id/main_activity_action_timeline" 
    android:orderInCategory="101" 
    android:title="@string/main_activity_action_timeline" /> 
<item 
    android:id="@+id/main_activity_action_settings" 
    android:orderInCategory="102" 
    android:title="@string/main_activity_action_settings" /> 
</menu> 

Und hier das Layout activity_main.xml:

<?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:id="@+id/main_content" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:fitsSystemWindows="true" 
tools:context="com.cats.timemanager.activities.MainActivity"> 

<android.support.design.widget.AppBarLayout 
    android:id="@+id/appbar" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:theme="@style/AppTheme.AppBarOverlay"> 

    <android.support.v7.widget.Toolbar 
     android:id="@+id/toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="?attr/actionBarSize" 
     android:background="?attr/colorPrimary" 
     app:layout_scrollFlags="scroll|enterAlways" 
     app:popupTheme="@style/AppTheme.PopupOverlay"> 

    </android.support.v7.widget.Toolbar> 

</android.support.design.widget.AppBarLayout> 

<android.support.v4.view.ViewPager 
    android:id="@+id/container" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" /> 

<android.support.design.widget.FloatingActionButton 
    android:id="@+id/fab" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_gravity="end|bottom" 
    android:layout_margin="@dimen/fab_margin" 
    android:tint="@color/white" 
    app:srcCompat="@drawable/apps_icon" /> 

</android.support.design.widget.CoordinatorLayout> 

Warum stürzt es so komisch? Sorry die Frage ist so lang, Sie können einfach den ersten Code ignorieren, den ich gepostet habe, weil ich nicht denke, dass der Fehler dort ist (wenn es irgendwelche gibt ...).

Answer 1

Für die mutigen Seelen, die versuchen, diesen Fehler zu lösen.

Die Menü stürzte immer die Anwendung: so entschied ich mich ein neues Projekt zu erstellen, das alle alten Dateien importiert und ich aktualisierte Support-Bibliotheken zu v27.0.2 (von 25.3.1).

Arbeitete für eine Stunde oder so: jetzt, wenn ich die App starte, sagt es mir, es stürzt OHNE einen Fehler zu werfen. Wenn ich auf "Anwendung schließen" klicke, funktioniert die App einwandfrei und das Menü funktioniert einwandfrei.

TLDR einfach aufgeben und

git checkout [olderVersionWithNoErrors]