具體報錯信息如下:
java.lang.RuntimeException:Unable to start activity ComponentInfo{com.fsgx.car.android.igo/com.fsgx.car.android.igo.usercenter.mytrips.MyTripsActivity}: java.lang.ClassCastException: android.view.AbsSavedState$1 cannot be cast to android.widget.HorizontalScrollView$SavedState
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2878)
......
Caused by:
java.lang.ClassCastException:android.view.AbsSavedState$1 cannot be cast to android.widget.HorizontalScrollView$SavedState
android.widget.HorizontalScrollView.onRestoreInstanceState(HorizontalScrollView.java:1702)
android.view.View.dispatchRestoreInstanceState(View.java:15781)
android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3271)
android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3277)
android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3277)
android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3277)
android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3277)
android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3277)
android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3277)
android.view.View.restoreHierarchyState(View.java:15759)
com.android.internal.policy.PhoneWindow.restoreHierarchyState(PhoneWindow.java:2130)
android.app.Activity.onRestoreInstanceState(Activity.java:1154)
android.app.Activity.performRestoreInstanceState(Activity.java:1109)
android.app.Instrumentation.callActivityOnRestoreInstanceState(Instrumentation.java:1175)
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2841)
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2940)
android.app.ActivityThread.-wrap12(ActivityThread.java)
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1663)
android.os.Handler.dispatchMessage(Handler.java:102)
android.os.Looper.loop(Looper.java:159)
android.app.ActivityThread.main(ActivityThread.java:6385)
java.lang.reflect.Method.invoke(Native Method)
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1096)
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:883)
報錯原因:
創建控件的時候在其構造方法裏動態創建了一個子控件,並把該控件的AttributeSet
參數傳遞給了子控件。
public SlidingTabLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
... ...
mTabStrip = new SlidingTabStrip(context,attrs);
... ...
}
傳遞AttributeSet給子控件會導致子控件與父控件擁有相同的id
,因此Android會嘗試將父控件的SavedState恢復給子控件,反之亦然。因此,會導致類型轉換bug。