AndroidにおけるBitmapとDrawableの相互変換方法

1.Drawable—>Bitmap
Resources res=getResources();
Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.sample_0); Resources res=getResources(); private byte[] Bitmap2Bytes(Bitmap bm){
2.Bitmap—->Drawable
Drawable drawable =new BitmapDrawable(bmp);
3、Drawable → Bitmap
public static Bitmap drawableToBitmap(Drawable drawable) {

    Bitmap bitmap = Bitmap.createBitmap(

                                    drawable.getIntrinsicWidth(),

                                    drawable.getIntrinsicHeight(),

                                    drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888

                                                    : Bitmap.Config.RGB_565);

    Canvas canvas = new Canvas(bitmap);

    //canvas.setBitmap(bitmap);

    drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());

    drawable.draw(canvas);

    return bitmap;

}
4、資源からBitmapを取得する
Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic);
5、Bitmap → byte[]

ByteArrayOutputStream baos = new ByteArrayOutputStream();

bm.compress(Bitmap.CompressFormat.PNG, 100, baos);

return baos.toByteArray();   }

6、 byte[] → Bitmap
private Bitmap Bytes2Bimap(byte[] b){

                if(b.length!=0){

                        return BitmapFactory.decodeByteArray(b, 0, b.length);

                }

                else {

                        return null;

                }

      }

転載先http://blog.csdn.net/hezhipin610039/article/details/7899248/