Android Development--drawable and bitmap knowledge

Get drawable from your resources

Drawable drawable = getResources().getDrawable(R.drawable.xxx);

drawable Conversion bitmapdrawble

BitmapDrawable bitmapdrawable = (BitmapDrawable) getResources().getDrawable(R.drawable.xxx);

Drawble conversion to bitmap

• The first way

  In fact, it is simpler to convert drawable to bitmapdrawable and then bitmapdrawable to bitmap.

  Bitmap bitmap = bitmapdrawable.getBitmap();

• The second way

  Need to re-draw, more troublesome, recommend the use of the first

    public static Bitmap drawableToBitmap(Drawable drawable) {         // 取 drawable 的长宽         int w = drawable.getIntrinsicWidth();         int h = drawable.getIntrinsicHeight();         // 取 drawable 的颜色格式         Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888                 : Bitmap.Config.RGB_565;         // 建立对应 bitmap         Bitmap bitmap = Bitmap.createBitmap(w, h, config);         // 建立对应 bitmap 的画布         Canvas canvas = new Canvas(bitmap);         drawable.setBounds(0, 0, w, h);         // 把 drawable 内容画到画布中         drawable.draw(canvas);         return bitmap;  }   

Bitmap conversion to Drawable

• The first way

• The second way

  Ps:bitmapdrawable is a subclass of drawable and can be used directly in the Drawable method

Android Development--drawable and bitmap knowledge