Android Question Rotate Button1.SetBackgroundImage???

Your code looks correct. Which issue have you encountered?

B4A say:
Error compiling program.
Error description: Unknown type: android.graphics.drawable.Drawable
Are you missing a library reference?
Occurred on line: 63
BM1.Initialize3(Button1.Background.Bitmap)
Word: bitmap

Button.Background returns a Drawable object. It may not be a BitmapDrawable. If you know that it is a BitmapDrawable (because you previously set an image) then you can write:

Hi, B4A say:

LogCat connected to: emulator-5554
** Activity (main) Create, isFirst = true **

main_activity_create (B4A line: 31)

Dim BMD1 As BitmapDrawable = Button1.Background
java.lang.RuntimeException: Object should first be initialized (Button).

Did you forget to call Activity.LoadLayout?
at anywheresoftware.b4a.AbsObjectWrapper.getObject(AbsObjectWrapper.java:46)
at anywheresoftware.b4a.objects.ViewWrapper.getBackground(ViewWrapper.java:85)
at anywheresoftware.b4a.samples.animation.main._activity_create(main.java:281)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:169)
at anywheresoftware.b4a.samples.animation.main.afterFirstLayout(main.java:89)
at anywheresoftware.b4a.samples.animation.main.access$100(main.java:16)
at anywheresoftware.b4a.samples.animation.main$WaitForLayout.run(main.java:74)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:3683)

at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
java.lang.RuntimeException: Object should first be initialized (Button).

Did you forget to call Activity.LoadLayout?
** Activity (main) Create, isFirst = true **

** Activity (main) Resume **

main_activity_longclick (B4A line: 94)

Dim BMD1 As BitmapDrawable = Button1.Background
java.lang.ClassCastException: android.graphics.drawable.StateListDrawable

at anywheresoftware.b4a.samples.animation.main._activity_longclick(main.java:403)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:169)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:157)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:153)
at anywheresoftware.b4a.objects.ViewWrapper$2.onLongClick(ViewWrapper.java:73)
at android.view.View.performLongClick(View.java:2503)
at android.view.View$CheckForLongPress.run(View.java:9056)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:3683)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)

The problem is that the button background is not a simple BitmapDrawable. It is a StateListDrawable.

This is why I wrote:

If you know that it is a BitmapDrawable (because you previously set an image)

Click to expand...

The above code will only work if you set the background as a BitmapDrawable.

Thanks,
¿how load one image in (visual) designer in one button (set BitmapDrawable)?

for work in this moment, i use this code, because the image files exist in folder "files" (saved) is same that (visual) designer, is same that function "File.DirAssets"
Dim BM1 As Bitmap, BM2 As Bitmap,C1 As Canvas, RSI1 As RSImageProcessing
BM1.Initialize(File.DirAssets,"compass2.png")
BM2 = RSI1.rotateBitmap(BM1,90)
Button2.SetBackgroundImage(BM2)

You will need to set the image with that code. The designer will always create a StateListDrawable (for buttons).

Thanks