android - Android ViewDragHelper 中的 ArrayIndexOutOfBoundsException

Question

我无法找出源代码中的错误所在。

有什么办法可以解决吗？

在我的代码中抛出了 "ArrayIndexOutOfBoundsException" 但我找不到位置。

logcat 在 android studio 中:

07-29 22:31:26.745  11782-11782/com.example.petr.myapp1 E/InputEventReceiver﹕ Exception dispatching input event.07-29 22:31:26.745  11782-11782/com.example.petr.myapp1 D/AndroidRuntime﹕ Shutting down VM07-29 22:31:26.745  11782-11782/com.example.petr.myapp1 W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x41595ba8)07-29 22:31:26.745  11782-11782/com.example.petr.myapp1 E/AndroidRuntime﹕ FATAL EXCEPTION: main    Process: com.example.petr.myapp1, PID: 11782    java.lang.ArrayIndexOutOfBoundsException: length=1; index=1            at android.support.v4.widget.ViewDragHelper.shouldInterceptTouchEvent(ViewDragHelper.java:1004)            at android.support.v4.widget.DrawerLayout.onInterceptTouchEvent(DrawerLayout.java:979)            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1859)            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)            at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2068)            at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1515)            at android.app.Activity.dispatchTouchEvent(Activity.java:2458)            at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2016)            at android.view.View.dispatchPointerEvent(View.java:7886)            at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3947)            at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3826)            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3392)            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3442)            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3411)            at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3518)            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3419)            at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3575)            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3392)            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3442)            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3411)            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3419)            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3392)            at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5532)            at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5512)            at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5483)            at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5612)            at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)            at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)            at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:176)            at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:5585)            at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:5631)            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)            at android.view.Choreographer.doCallbacks(Choreographer.java:574)            at android.view.Choreographer.doFrame(Choreographer.java:542)            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)            at android.os.Handler.handleCallback(Handler.java:733)            at android.os.Handler.dispatchMessage(Handler.java:95)            at android.os.Looper.loop(Looper.java:136)            at android.app.ActivityThread.main(ActivityThread.java:5001)            at java.lang.reflect.Method.invokeNative(Native Method)            at java.lang.reflect.Method.invoke(Method.java:515)            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)            at dalvik.system.NativeStart.main(Native Method)

Answer 1

感谢 this.，我能够解决这个问题要解决此问题，需要在 ViewGroup 中覆盖两个方法。

• requestDisallowInterceptTouchEvent(boolean disallowIntercept)
• dispatchTouchEvent(MotionEvent ev)

requestDisallowInterceptTouchEvent 设置如下:

@Override
public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
    Log.i(TAG, "In requestDisallowInterceptTouchEvent!!!");
    mIsDisallowIntercept = disallowIntercept;
    super.requestDisallowInterceptTouchEvent(disallowIntercept);
}

将 disallowIntercept 存储在本地:

private boolean mIsDisallowIntercept = false;

然后dispatchTouchEvent是这样设置的:

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    if (ev.getPointerCount() > 1 && mIsDisallowIntercept) {
        requestDisallowInterceptTouchEvent(false);
        boolean handled = super.dispatchTouchEvent(ev);
        requestDisallowInterceptTouchEvent(true);
        return handled;
    } else {
        return super.dispatchTouchEvent(ev);
    }
}

其他解决方案包括像这样覆盖 onInterceptTouchEvent:

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) { 
        if( _locked ) {
            return false;
        } else {
            try{
                return super.onInterceptTouchEvent(ev);
            }catch(IllegalArgumentException ex){
                ex.printStackTrace();
            }
        }
        return false;
}

此方法对我没有帮助，但可能对其他人有帮助。找到此解决方案 here.

希望对您有所帮助。