Set a NinePatch Background Programmatically

StackOverflow https://stackoverflow.com/questions/21644935

  •  08-10-2022
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Question

When I'm trying to use 9patch background programmatically,

it only works when: (scenario 1) the 'Stretch Regions' (top/left) is bigger then the 'Content Padding Regions' (bottom/right)

but if: (scenario 2) the padding is bigger then the stretch - I'm getting this error:

02-08 10:32:04.203: E/AndroidRuntime(397): FATAL EXCEPTION: main
02-08 10:32:04.203: E/AndroidRuntime(397): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.game.test}: java.lang.ClassCastException: android.graphics.drawable.BitmapDrawable
02-08 10:32:04.203: E/AndroidRuntime(397):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
02-08 10:32:04.203: E/AndroidRuntime(397):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
02-08 10:32:04.203: E/AndroidRuntime(397):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-08 10:32:04.203: E/AndroidRuntime(397):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
02-08 10:32:04.203: E/AndroidRuntime(397):  at android.os.Handler.dispatchMessage(Handler.java:99)
02-08 10:32:04.203: E/AndroidRuntime(397):  at android.os.Looper.loop(Looper.java:123)
02-08 10:32:04.203: E/AndroidRuntime(397):  at android.app.ActivityThread.main(ActivityThread.java:3683)
02-08 10:32:04.203: E/AndroidRuntime(397):  at java.lang.reflect.Method.invokeNative(Native Method)
02-08 10:32:04.203: E/AndroidRuntime(397):  at java.lang.reflect.Method.invoke(Method.java:507)
02-08 10:32:04.203: E/AndroidRuntime(397):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-08 10:32:04.203: E/AndroidRuntime(397):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-08 10:32:04.203: E/AndroidRuntime(397):  at dalvik.system.NativeStart.main(Native Method)
02-08 10:32:04.203: E/AndroidRuntime(397): Caused by: java.lang.ClassCastException: android.graphics.drawable.BitmapDrawable
02-08 10:32:04.203: E/AndroidRuntime(397):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-08 10:32:04.203: E/AndroidRuntime(397):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)

anyone knows how to solve scenario 2?

Code:

linLayout = new LinearLayout(this);
NinePatchDrawable ninep = (NinePatchDrawable)getResources().getDrawable(R.drawable.ninepatch_background) ;
linLayout.setBackground(ninep);
Was it helpful?

Solution 2

What I end up doing is to use scenario 1 NinePatch (Stretch is bigger then Padding - which I didn't want)

and set up the padding zone manually, with this code:

NinePatchDrawable ninepatch;
Bitmap image = BitmapFactory.decodeResource(getResources(),R.drawable.ninepatch_background);
if (image.getNinePatchChunk()!=null){
    byte[] chunk = image.getNinePatchChunk();
    Rect paddingRectangle = new Rect(30, 0, 30, 50);
    ninepatch = new NinePatchDrawable(getResources(), image, chunk, paddingRectangle, null);
}
int sdk = android.os.Build.VERSION.SDK_INT;
if(sdk < android.os.Build.VERSION_CODES.JELLY_BEAN) {
    linLayout.setBackgroundDrawable(ninepatch);
} else {
    linLayout.setBackground(ninepatch);
}

OTHER TIPS

There is no need to create a NinePatchDrawable object. You can simply use setBackgroundResource(R.drawable.ninepatch_background). I don't know if that's the problem but I hope it helps.

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