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PONullPointerException in Drawable's mutate method Android 1.6
 

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  1. PONullPointerException in Drawable's mutate method Android 1.6
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    <p>When using mutate on Android 1.6 with list state Drawable I got always a Null Pointer Exception. It works flawlessly on higher Android versions. I am using the default android list_selector_background as the drawable to mutate, and I need to mutate it otherwise pressed backgrounds get pretty messy -> all or some of them are getting highlight when one is pressed. </p> <p>The project is here: </p> <p><a href="http://code.google.com/p/tree-view-list-android/" rel="nofollow">http://code.google.com/p/tree-view-list-android/</a></p> <p>And relevant piece of code here: <a href="http://code.google.com/p/tree-view-list-android/source/browse/src/pl/polidea/treeview/AbstractTreeViewAdapter.java#205" rel="nofollow">http://code.google.com/p/tree-view-list-android/source/browse/src/pl/polidea/treeview/AbstractTreeViewAdapter.java#205</a></p> <pre><code>return activity.getResources() .getDrawable(android.R.drawable.list_selector_background) .mutate(); </code></pre> <p>Stack trace below:</p> <pre><code>3-11 11:37:39.973: ERROR/AndroidRuntime(5304): java.lang.NullPointerException 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.graphics.drawable.StateListDrawable.mutate(StateListDrawable.java:227) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at pl.polidea.treeview.AbstractTreeViewAdapter.getDrawableOrDefaultBackground(AbstractTreeViewAdapter.java:201) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at pl.polidea.treeview.AbstractTreeViewAdapter.populateTreeItem(AbstractTreeViewAdapter.java:210) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at pl.polidea.treeview.AbstractTreeViewAdapter.getView(AbstractTreeViewAdapter.java:153) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.widget.AbsListView.obtainView(AbsListView.java:1273) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.widget.ListView.makeAndAddView(ListView.java:1658) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.widget.ListView.fillDown(ListView.java:637) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.widget.ListView.fillFromTop(ListView.java:694) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.widget.ListView.layoutChildren(ListView.java:1516) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.widget.AbsListView.onLayout(AbsListView.java:1112) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.view.View.layout(View.java:6569) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:998) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.widget.LinearLayout.onLayout(LinearLayout.java:918) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.view.View.layout(View.java:6569) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.widget.FrameLayout.onLayout(FrameLayout.java:333) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.view.View.layout(View.java:6569) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:998) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.widget.LinearLayout.onLayout(LinearLayout.java:918) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.view.View.layout(View.java:6569) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.widget.FrameLayout.onLayout(FrameLayout.java:333) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.view.View.layout(View.java:6569) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.view.ViewRoot.performTraversals(ViewRoot.java:979) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.view.ViewRoot.handleMessage(ViewRoot.java:1613) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.os.Handler.dispatchMessage(Handler.java:99) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.os.Looper.loop(Looper.java:123) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at android.app.ActivityThread.main(ActivityThread.java:4203) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at java.lang.reflect.Method.invokeNative(Native Method) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at java.lang.reflect.Method.invoke(Method.java:521) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 03-11 11:37:39.973: ERROR/AndroidRuntime(5304): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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