1、bitmap转换为drawable

public static Drawable bitmap2Drawable(Bitmap bitmap)
{
if(bitmap == null)
return null;
else
return new BitmapDrawable(bitmap);
}

2、drawable转换为bitmap

public static Bitmap drawable2Bitmap(Drawable drawable)
{
if(drawable == null)
return null;
else
return ((BitmapDrawable)drawable).getBitmap();
}

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