显示java.lang.NullPointerException - onModifiedTouchEvent

Question

以下例外发生在Android框架：

java.lang.NullPointerException 
at android.inputmethodservice.KeyboardView.onModifiedTouchEvent(KeyboardView.java:1270) 
at android.inputmethodservice.KeyboardView.onTouchEvent(KeyboardView.java:1209) 
at android.view.View.dispatchTouchEvent(View.java:7249) 
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2177) 
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1878) 
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2177) 
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1878) 
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2177) 
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1878) 
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2177) 
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1878) 
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2177) 
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1878) 
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2177) 
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1878) 
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2177) 
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1878) 
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2177) 
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1878) 
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2177) 
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1878) 
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1954) 
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1405) 
at android.app.Activity.dispatchTouchEvent(Activity.java:2410) 
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1902) 
at android.view.View.dispatchPointerEvent(View.java:7429) 
at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3358) 
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3303) 
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:4444) 
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:4423) 
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:4515) 
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:179) 
at android.os.MessageQueue.nativePollOnce(Native Method) 
at android.os.MessageQueue.next(MessageQueue.java:125) 
at android.os.Looper.loop(Looper.java:124) 
at android.app.ActivityThread.main(ActivityThread.java:5041) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:511) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
at dalvik.system.NativeStart.main(Native Method) 

我在做什么，是造成这个框架崩溃？

Answer 1

您使用的是KeyboardView没有设定OnKeyboardActionListener：

mKeyboardView.setOnKeyboardActionListener(new OnKeyboardActionListener() { 

    @Override 
    public void onKey(int primaryCode, int[] keyCodes) { 
    } 

    @Override 
    public void swipeUp() { 
    } 

    @Override 
    public void swipeRight() { 
    } 

    @Override 
    public void swipeLeft() { 
    } 

    @Override 
    public void swipeDown() { 
    } 

    @Override 
    public void onText(CharSequence text) { 
    } 

    @Override 
    public void onRelease(int primaryCode) { 
    } 

    @Override 
    public void onPress(int primaryCode) { 
    } 

}