How can I compare the Image of an ImageButton to a drawable?

Question

I want a certain action to be done if the image of my ImageButton button is equal to a drawable. Like this:

if (button.getBackground().getConstantState()==getResources().getDrawable(R.drawable.mydrawable).getConstantState())
{
     //perform action//
}

But if I do so, getDrawable gets red underline and I don't know why?

Can anyone help me?

Answer 1

First

ImageButton temp =  findViewById(R.id.myImagebtn);
Bitmap imageBtm = ((BitmapDrawable)temp.getDrawable()).getBitmap();
Drawable myDrawable = getResources().getDrawable(R.drawable.apple);
Bitmap appleBtm = ((BitmapDrawable) myDrawable).getBitmap();

second

if(imageBtm.sameAs(appleBtm))
{
Log.i("Bitmap compare", "equal");
}

Answer 2

getConstantState() doesn't always work.

You could compare if they are equal with their:

• width x height
• pixels
• bytes