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I use a view which has RelativeLayout -> ScrollView -> LinearLayout. I get exception:
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)
Why does it happen only occassionally? Why is there no detail of where the code failed?
Update: I suspect it should fail around this code:
EditText input = new EditText(context);
input.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
LayoutParams is RelativeLayout.LayoutParams
834
ViewGroup is a collection of Views(TextView, EditText, ListView, etc..), somewhat like a container. A View object is a component of the user interface (UI) like a button or a text box, and it's also called a widget.
In android (and most other technologies), views can have subviews, aka "children". Most views can have children and can be a child of a parent view. It's kind of like a "tree". The most obvious feature of being a child of some other view is that the child moves with the parent view.
View is a basic building block of UI (User Interface) in android. A view is a small rectangular box which responds to user inputs. Eg: EditText , Button , CheckBox , etc.. ViewGroup is a invisible container of other views (child views) and other viewgroups.
Android supports the following ViewGroups: LinearLayout. AbsoluteLayout. TableLayout.
Use new LinearLayout.LayoutParams(...) instead of new LayoutParams(...)
You always need to use the parent layout's class for the LayoutParams. E.g. if EditText is inside FrameLayout then FrameLayout.LayoutParams must be used.
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