動畫結束時dismiss掉popupwindow出錯 at android.view.ViewRootImpl.drawAccessibilityFocusedDrawableIfNeeded

導致這個錯誤的是動畫結束時dismiss掉popupwindow出錯

java.lang.NullPointerException
at android.view.ViewRootImpl.drawAccessibilityFocusedDrawableIfNeeded(ViewRootImpl.java:2429)
at android.view.ViewRootImpl.drawSoftware(ViewRootImpl.java:2386)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:2277)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2145)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1956)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1113)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4481)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
at android.view.Choreographer.doCallbacks(Choreographer.java:555)
at android.view.Choreographer.doFrame(Choreographer.java:525)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4867)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1007)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:774)
at dalvik.system.NativeStart.main(Native Method)

解決方法：來自 stackoverflow ，在動畫結束時調用handler來dismiss popupwindow 。

animation.setAnimationListener(new AnimationListener() {
    public void onAnimationEnd(final Animation animation) {
        // The animation has ended
        new Handler().post(new Runnable() {
            @Override
            public void run() {
                popupWindow.dismiss();
            }
        });
    }
    public void onAnimationRepeat(final Animation animation) {}
    public void onAnimationStart(final Animation animation) {}
});

原文：http://www.tuicool.com/articles/mi2u6r