Android中 Bitmap和Drawable相互转换的方法

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、从资源中获取Bitmap

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;                }      }

转载自http://blog.csdn.net/hezhipin610039/article/details/7899248/

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