博客

具体报错信息如下：

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)

报错原因：

创建控件的时候在其构造方法里动态创建了一个子控件，并把该控件的

AttributeSet

参数传递给了子控件。

public SlidingTabLayout(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    ... ...
    mTabStrip = new SlidingTabStrip(context,attrs);
    ... ...
}

传递AttributeSet给子控件会导致子控件与父控件拥有相同的

id

，因此Android会尝试将父控件的SavedState恢复给子控件，反之亦然。因此，会导致类型转换bug。

参考：


java.lang.ClassCastException: android.view.AbsSavedState$1 cannot be cast to android.support.v7.widget.Toolbar$SavedState