setContentView вызывает NullPointerException

I/m имеет исключение NullPointerException, и я считаю, что проблема связана с setContentView в методе onCreate.setContentView вызывает NullPointerException

здесь является основным видом деятельности:

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

    }

и это код, в котором я добавить текст в TextView .. этот код написан на другом виде:

public boolean onTouchEvent(MotionEvent event) { 

    // get pointer index from the event object 
    int pointerIndex = event.getActionIndex(); 

    // get pointer ID 
    int pointerId = event.getPointerId(pointerIndex); 

    // get masked (not specific to a pointer) action 
    int maskedAction = event.getActionMasked(); 

    switch (maskedAction) { 

    case MotionEvent.ACTION_DOWN: 
    case MotionEvent.ACTION_POINTER_DOWN: { 
     // We have a new pointer. Lets add it to the list of pointers 

     PointF f = new PointF(); 
     f.x = event.getX(pointerIndex); 
     f.y = event.getY(pointerIndex); 
     mActivePointers.put(pointerId, f); 
     break; 
    } 
    case MotionEvent.ACTION_MOVE: { // a pointer was moved 
     for (int size = event.getPointerCount(), i = 0; i < size; i++) { 
      PointF point = mActivePointers.get(event.getPointerId(i)); 
      if (point != null) { 
       point.x = event.getX(i); 
       point.y = event.getY(i); 
      } 
     } 
     break; 
    } 
    case MotionEvent.ACTION_UP: 
     String schema = getLetterSchema(); 
     String letter = getLetter(schema); 

     if(letter == null) { 
      System.out.println("***************************"); 
      System.out.println("****ERROR***"+schema+"***"); 
      System.out.println("***************************"); 
     } else { 

      TextView t=(TextView)findViewById(R.id.textView); 
      t.setText(letter); 

      System.out.println("***************************"); 
      System.out.println("*"+letter+"*"); 
      System.out.println("****************"+schema+"****"); 
     } 

     mActivePointers.clear(); 
     break; 
    case MotionEvent.ACTION_POINTER_UP: 
     // DO NOT USE 
     break; 
    case MotionEvent.ACTION_CANCEL: { 
     // DO NOT USE 
     mActivePointers.clear(); 
     break; 
    } 
    } 
    ; 
    invalidate(); 

    return true; 
}

здесь является войти:

09-09 18:01:47.221: I/(29842): PLATFORM VERSION : JB-MR-2 
09-09 18:01:47.246: D/mali_winsys(29842): new_window_surface returns 0x3000 
09-09 18:01:47.321: D/OpenGLRenderer(29842): Enabling debug mode 0 
09-09 18:01:50.546: E/InputEventReceiver(29842): Exception dispatching input event. 
09-09 18:01:50.551: E/MessageQueue-JNI(29842): Exception in MessageQueue callback:  handleReceiveCallback 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): java.lang.NullPointerException 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at com.example.multitouch.MultitouchView.onTouchEvent(MultitouchView.java:127) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.View.dispatchTouchEvent(View.java:8112) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2420) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2153) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2420) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2153) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2420) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2153) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2420) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2153) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2252) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1587) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.app.Activity.dispatchTouchEvent(Activity.java:2507) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2200) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.View.dispatchPointerEvent(View.java:8320) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4558) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4430) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3988) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4042) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4011) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4122) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4019) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4179) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3988) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4042) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4011) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4019) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3988) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6333) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6249) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6220) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6185) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6413) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.os.MessageQueue.nativePollOnce(Native Method) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.os.MessageQueue.next(MessageQueue.java:138) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.os.Looper.loop(Looper.java:123) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at android.app.ActivityThread.main(ActivityThread.java:5335) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at java.lang.reflect.Method.invokeNative(Native Method) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at java.lang.reflect.Method.invoke(Method.java:515) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081) 
09-09 18:01:50.556: E/MessageQueue-JNI(29842): at dalvik.system.NativeStart.main(Native Method) 
09-09 18:01:50.556: D/AndroidRuntime(29842): Shutting down VM 
09-09 18:01:50.556: W/dalvikvm(29842): threadid=1: thread exiting with uncaught exception (group=0x4175fc08) 
09-09 18:01:50.571: E/AndroidRuntime(29842): FATAL EXCEPTION: main 
09-09 18:01:50.571: E/AndroidRuntime(29842): Process: com.example.multitouch, PID: 29842 
09-09 18:01:50.571: E/AndroidRuntime(29842): java.lang.NullPointerException 
09-09 18:01:50.571: E/AndroidRuntime(29842): at com.example.multitouch.MultitouchView.onTouchEvent(MultitouchView.java:127) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.View.dispatchTouchEvent(View.java:8112) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2420) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2153) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2420) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2153) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2420) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2153) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2420) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2153) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2252) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1587) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.app.Activity.dispatchTouchEvent(Activity.java:2507) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2200) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.View.dispatchPointerEvent(View.java:8320) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4558) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4430) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3988) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4042) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4011) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4122) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4019) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4179) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3988) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4042) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4011) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4019) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3988) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6333) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6249) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6220) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6185) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6413) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.os.MessageQueue.nativePollOnce(Native Method) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.os.MessageQueue.next(MessageQueue.java:138) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.os.Looper.loop(Looper.java:123) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at android.app.ActivityThread.main(ActivityThread.java:5335) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at java.lang.reflect.Method.invokeNative(Native Method) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at java.lang.reflect.Method.invoke(Method.java:515) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081) 
09-09 18:01:50.571: E/AndroidRuntime(29842): at dalvik.system.NativeStart.main(Native Method) 
09-09 18:01:53.381: I/Process(29842): Sending signal. PID: 29842 SIG: 9

линия 127 это: t.setText(letter);

44445 +16410617451515053691368888

здесь является основным видом деятельности:

public class MainActivity extends Activity 
{ 

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

    } 

    @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, menu); 
     return true; 
    } 

}

источник

2014-09-09 Haya D

Вам нужно будет опубликовать stacktrace, чтобы мы могли видеть, где ошибка. – codeMagic

Почему вы считаете, что это ошибка setContentView? – Blackbelt

coud вы публикуете свою ошибку logcat? –

Ваше предположение неверно. Это не имеет никакого отношения к setContentView(), а скорее к вашему звонку findViewById. Вы указываете, что код от другой вид, что означает, что ваш код находится в пределах класса, который распространяется на View. Но View сам также имеет метод findViewById(). Ниже документация

Ищите детское представление с данным идентификатором. Если это представление имеет данный идентификатор, верните это представление.

Параметры:
ID ID для поиска.
Возвращает:
мнения, что имеет данный идентификатор в иерархии или нулевой

И я думаю, ваш R.id.textView не ребенок вашей другого вида.

Вы звоните findViewById() на свой номер Context, например, позвоните по номеру getContext().findViewById(R.id.textView). Надеюсь, это поможет.

источник

2014-09-09 19:08:10 stealthjong

setContentView вызывает NullPointerException

ответ

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