所以我正在使用Pwittchen的Swipe库，正在使用的代码是这一部分：
CoreActivity.java
@Override
public void onSwipedDown(final MotionEvent event) {
if(m_Toolbar.getVisibility() == View.VISIBLE ){
WebShrink.cancel();
}
//WebView Animation (Shrink)
// if(m_WebView.getAnimation().hasStarted() || m_WebView.getAnimation().hasEnded()){
if(WebEnlarge.hasStarted()){
WebShrink = AnimationUtils.loadAnimation(CoreActivity.this,R.anim.m_webview_shrink);
m_WebView.startAnimation(WebShrink);
m_Preference_Toolbar.setVisibility(View.GONE);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
m_Toolbar.setVisibility(View.VISIBLE);
}
}, 350);//3 seconds
}
}
目前，如果您在创建时向下滑动，我会崩溃。我试图找到解决方法：
if(m_Toolbar.getVisibility() == View.VISIBLE ){
WebShrink.cancel();
}
但这不起作用，我想知道是否有人可以帮助我。理想的情况是，如果工具栏可见或者WebShrink已经到位，那么什么都不做，但我无法找到它周围
logcat的
01-18 20:57:23.652 29764-29764/com.equiware.mickeyt.fire E/InputEventReceiver: Exception dispatching input event.
01-18 20:57:23.653 29764-29764/com.equiware.mickeyt.fire D/AndroidRuntime: Shutting down VM
01-18 20:57:23.654 29764-29764/com.equiware.mickeyt.fire E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.equiware.mickeyt.fire, PID: 29764
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.animation.Animation.cancel()' on a null object reference
at com.equiware.mickeyt.fire.CoreActivity$2.onSwipedDown(CoreActivity.java:161)
at com.github.pwittchen.swipe.library.rx2.Swipe.onActionUp(Swipe.java:138)
at com.github.pwittchen.swipe.library.rx2.Swipe.dispatchTouchEvent(Swipe.java:101)
at com.equiware.mickeyt.fire.CoreActivity.dispatchTouchEvent(CoreActivity.java:216)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:68)
at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:374)
at android.view.View.dispatchPointerEvent(View.java:10177)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4628)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4496)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3947)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4000)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3966)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3974)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3947)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4000)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3966)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4095)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3974)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4152)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3947)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4000)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3966)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3974)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3947)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6437)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6411)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6372)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6571)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)
at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:176)
at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:6519)
at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:6594)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871)
at android.view.Choreographer.doCallbacks(Choreographer.java:683)
at android.view.Choreographer.doFrame(Choreographer.java:613)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6247)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:872)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762)
答案 0 :(得分：1)
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.animation.Animation.cancel()' on a null object reference at com.equiware.mickeyt.fire.CoreActivity$2.onSwipedDown(CoreActivity.java:161)
第161行似乎是：
WebShrink.cancel();
WebShrink可能是null。
答案 1 :(得分：0)
您应该在onSwipeDown方法之外加载动画，也许您可以将其放在活动的onCreate中：
WebShrink = AnimationUtils.loadAnimation(CoreActivity.this,R.anim.m_webview_shrink);
然后在调用onSwipeDown之前将其实例化。