Convert immutable Bitmap file to mutable Bitmap

问题

A:

 Bitmap immutableBmp= BitmapFactory.decodeResource(getApplicationContext().getResources(),R.drawable.sample);
 mutableBitmap=immutableBmp.copy(Bitmap.Config.ARGB_8888, true);

B:

Bitmap immutableBmp= BitmapFactory.decodeFile(filePath);
mutableBitmap=immutableBmp.copy(Bitmap.Config.ARGB_8888, true);

C:

BitmapFactory.Options options = new BitmapFactory.Options();
options.inMutable=true;
myBitmap=BitmapFactory.decodeFile(filePath,options);

A works but B and C don't. I am trying to convert an immutable bitmap to mutable. It works on resource images but not file images. What's the problem?

回答1:

Found this:

Bitmap bmp_Copy = bmp_Base.copy(Bitmap.Config.ARGB_8888,true);

回答2:

I have found the problem! All of the 3 methods above are working, there was a problem with the resolution of my image, so I thought the code didn't work and it was not mutable but I was wrong. Here is another solution to change immutable image to mutable.

BitmapFactory.decodeResource returns a mutable Bitmap in Android 2.2 and an immutable Bitmap in Android 1.6

来源：https://stackoverflow.com/questions/30425789/convert-immutable-bitmap-file-to-mutable-bitmap