cheesesquare是一个用于材料设计的演示应用程序。
在将compileSdkVersion，targetSdkVersion以及库com.android.support{design|appcompat-v7|cardview-v7|recyclerview-v7}更新为版本23时，会出现bug。
当手动关闭快餐栏时，应用程序崩溃如下：
09-02 17:56:30.883 27476-27476/com.support.android.designlibdemo E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.support.android.designlibdemo, PID: 27476
java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.MotionEvent.getAction()' on a null object reference
at android.support.design.widget.AppBarLayout$Behavior.onInterceptTouchEvent(AppBarLayout.java:729)
at android.support.design.widget.AppBarLayout$Behavior.onInterceptTouchEvent(AppBarLayout.java:629)
at android.support.design.widget.CoordinatorLayout.performIntercept(CoordinatorLayout.java:357)
at android.support.design.widget.CoordinatorLayout.onInterceptTouchEvent(CoordinatorLayout.java:409)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1960)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2369)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1719)
at android.app.Activity.dispatchTouchEvent(Activity.java:2742)
at android.support.v7.internal.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
at android.support.v7.internal.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2330)
at android.view.View.dispatchPointerEvent(View.java:8666)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4123)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3989)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3680)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3737)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5807)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5781)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5752)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5897)
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:5868)
at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:5920)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
at android.view.Choreographer.doCallbacks(Choreographe
覆盖默认的AppBarLayout.Behavior onInterceptTouchEvent方法，如下所示：
@Override
public boolean onInterceptTouchEvent(CoordinatorLayout parent, AppBarLayout child,
MotionEvent ev) {
return ev != null && super.onInterceptTouchEvent(parent, child, ev);
}
并将其应用于AppBarLayout。
但我不确定这是什么意思。
我发现的最明确的建议是this
public class AppBarLayoutBehavior extends AppBarLayout.Behavior {
@Override
public boolean onInterceptTouchEvent(CoordinatorLayout parent, AppBarLayout child,
MotionEvent ev) {
return !(parent != null && child != null && ev != null)
|| super.onInterceptTouchEvent(parent, child, ev);
}
}
设置行为：
((CoordinatorLayout.LayoutParams) findViewById(R.id.appBarLayout).getLayoutParams()).setBehavior(new AppBarLayoutBehavior());
所以我添加了课程AppBarLayoutBehavior并将上面的行放在相关课程的onCreate中。但现在我明白了：
09-02 17:49:38.421 23604-23604/com.support.android.designlibdemo E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.support.android.designlibdemo, PID: 23604
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.support.android.designlibdemo/com.support.android.designlibdemo.MainActivity}: java.lang.ClassCastException: android.support.v4.widget.DrawerLayout$LayoutParams cannot be cast to android.support.design.widget.CoordinatorLayout$LayoutParams
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.ClassCastException: android.support.v4.widget.DrawerLayout$LayoutParams cannot be cast to android.support.design.widget.CoordinatorLayout$LayoutParams
at com.support.android.designlibdemo.MainActivity.onCreate(MainActivity.java:64)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
测试
答案 0 :(得分：1)
已在23.0.1版中修复。支持库