java.lang.ClassCastException:android.view.ViewGroup $ LayoutParams没有LayoutParams的用法

我使用了一个具有RelativeLayout – > ScrollView – > LinearLayout的视图。 我得到例外:

11-22 11:17:24.605: ERROR/AndroidRuntime(5161): FATAL EXCEPTION: main 11-22 11:17:24.605: ERROR/AndroidRuntime(5161): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams 11-22 11:17:24.605: ERROR/AndroidRuntime(5161): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3131) 11-22 11:17:24.605: ERROR/AndroidRuntime(5161): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 11-22 11:17:24.605: ERROR/AndroidRuntime(5161): at android.view.View.measure(View.java:8172) 11-22 11:17:24.605: ERROR/AndroidRuntime(5161): at android.view.ViewRoot.performTraversals(ViewRoot.java:805) 11-22 11:17:24.605: ERROR/AndroidRuntime(5161): at android.view.ViewRoot.handleMessage(ViewRoot.java:1744) 11-22 11:17:24.605: ERROR/AndroidRuntime(5161): at android.os.Handler.dispatchMessage(Handler.java:99) 11-22 11:17:24.605: ERROR/AndroidRuntime(5161): at android.os.Looper.loop(Looper.java:144) 11-22 11:17:24.605: ERROR/AndroidRuntime(5161): at android.app.ActivityThread.main(ActivityThread.java:4937) 11-22 11:17:24.605: ERROR/AndroidRuntime(5161): at java.lang.reflect.Method.invokeNative(Native Method) 11-22 11:17:24.605: ERROR/AndroidRuntime(5161): at java.lang.reflect.Method.invoke(Method.java:521) 11-22 11:17:24.605: ERROR/AndroidRuntime(5161): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 11-22 11:17:24.605: ERROR/AndroidRuntime(5161): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 11-22 11:17:24.605: ERROR/AndroidRuntime(5161): at dalvik.system.NativeStart.main(Native Method) 

为什么只偶尔发生? 为什么没有代码失败的细节?

更新:我怀疑它应该失败这个代码:

 EditText input = new EditText(context); input.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); 

LayoutParams是RelativeLayout.LayoutParams

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使用new LinearLayout.LayoutParams(...)而不是new LayoutParams(...)

您始终需要为LayoutParams使用父级布局的类。 例如,如果EditTextFrameLayout则必须使用FrameLayout.LayoutParams