Drawable與Bitmap相互轉換

Bitmap和Drawable區別

• 在進行兩者的轉換之前我們需要了解：Biamap與Drawable的區別

Biamap轉換爲Drawable

• Bitmap轉換爲Drawable

Drawable bitmapDrawable = new BitmapDrawable(bitmap);
imageView.setBackground(bitmapDrawable);

Drawable轉換爲Bitmap

將png格式drawable轉換爲Bitmap

Bitmap bitmap = BitmapFactory.decodeResource(getResources(), 
R.drawable.niuniu);
imageView.setImageBitmap(bitmap);

將xml格式的VectorDrawable轉換爲Bitmap

Drawable drawable = getResources().getDrawable(R.drawable.rotation);
Bitmap bitmap = DrawableToBitmap(drawable);imageView.setImageBitmap(bitmap);


private Bitmap DrawableToBitmap(Drawable drawable){
    Bitmap bitmap = null;
    int width = drawable.getIntrinsicWidth();
    int height = drawable.getIntrinsicHeight();
    bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    drawable.setBounds(0, 0, width, height);
    drawable.draw(canvas);
    return bitmap;
}