Fehler beim Hinzufügen von Kontrollkästchen zur Navigationsleiste ListView

Question

Ich versuche, meiner Android-Anwendung eine benutzerdefinierte Navigationsleiste hinzuzufügen. Was ich brauche, ist eine Listenansicht hinzuzufügen, die Symbol, Name und ein Kontrollkästchen enthält.

Momentan konnte ich ein Symbol und einen Namen hinzufügen.

Das ist mein onCreateView in NavigationDrawerFragment.java

public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     mDrawerListView = (ListView) inflater.inflate(
       R.layout.fragment_navigation_drawer, container, false); 
     mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
       selectItem(position); 
      } 
     }); 

     final TypedArray typedArray = getResources().obtainTypedArray(R.array.sections_icons); 
     mDrawerListView.setAdapter(new ArrayAdapter<String>(
       getActionBar().getThemedContext(), 
       android.R.layout.simple_list_item_activated_1, 
       android.R.id.text1, 
       getResources().getStringArray(R.array.sections) 
     ) { 
      @Override 
      public View getView(int position, View convertView, ViewGroup parent) { 
       View v = super.getView(position, convertView, parent); 
       int resourceId = typedArray.getResourceId(position, 0); 
       Drawable drawable = getResources().getDrawable(resourceId); 
       ((TextView) v).setCompoundDrawablesWithIntrinsicBounds(drawable, null, null, null); 
       return v; 
      } 
     }); 

     mDrawerListView.setItemChecked(mCurrentSelectedPosition, true); 
     return mDrawerListView; 
    } 

Aber ich konnte nicht das Kontrollkästchen meiner Navigationsleiste hinzuzufügen. Also, ich folgte this und ich versuchte, Kontrollkästchen hinzufügen, indem mDrawerList.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

Dies gibt mir den folgenden Fehler.

05-05 11:24:49.537 3640-3640/com.myayubo E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    Process: com.myayubo, PID: 3640 
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myayubo/com.myayubo.MainActivity}: java.lang.NullPointerException 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2338) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390) 
      at android.app.ActivityThread.access$800(ActivityThread.java:151) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321) 
      at android.os.Handler.dispatchMessage(Handler.java:110) 
      at android.os.Looper.loop(Looper.java:193) 
      at android.app.ActivityThread.main(ActivityThread.java:5299) 
      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:829) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:645) 
      at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.NullPointerException 
      at com.myayubo.MainActivity.onCreate(MainActivity.java:67) 
      at android.app.Activity.performCreate(Activity.java:5264) 
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088) 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2302) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390) 
            at android.app.ActivityThread.access$800(ActivityThread.java:151) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321) 
            at android.os.Handler.dispatchMessage(Handler.java:110) 
            at android.os.Looper.loop(Looper.java:193) 
            at android.app.ActivityThread.main(ActivityThread.java:5299) 
            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:829) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:645) 
            at dalvik.system.NativeStart.main(Native Method) 

Jemand bitte sagen Sie mir, wie Sie Kontrollkästchen zu meinem Code hinzufügen.

Vielen Dank im Voraus. :)

Answer 1

Sie sollten diese Art und Weise tun:

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    View rootView = inflater.inflate(R.layout.fragment_navigation_drawer, container, false); 

    ListView mDrawerListView = (ListView) rootView.findViewById(R.id.listView); 
    mDrawerList.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); 
    // Other stuff 
    return rootView; 
} 

Edit 1:

public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     View rootView = inflater.inflate(R.layout.fragment_navigation_drawer, container, false); 

    ListView mDrawerListView = (ListView) rootView.findViewById(R.id.listView); 
    mDrawerList.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); 

     mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
       selectItem(position); 
      } 
     }); 

     final TypedArray typedArray = getResources().obtainTypedArray(R.array.sections_icons); 
     mDrawerListView.setAdapter(new ArrayAdapter<String>(
       getActionBar().getThemedContext(), 
       android.R.layout.simple_list_item_activated_1, 
       android.R.id.text1, 
       getResources().getStringArray(R.array.sections) 
     ) { 
      @Override 
      public View getView(int position, View convertView, ViewGroup parent) { 
       View v = super.getView(position, convertView, parent); 
       int resourceId = typedArray.getResourceId(position, 0); 
       Drawable drawable = getResources().getDrawable(resourceId); 
       ((TextView) v).setCompoundDrawablesWithIntrinsicBounds(drawable, null, null, null); 
       return v; 
      } 
     }); 

     mDrawerListView.setItemChecked(mCurrentSelectedPosition, true); 
     return rootView; 
    } 

Sie tun, ist falsch mit der Listview-Bindung.

Hoffe, das wird Sinn machen.