Drawable、Bitmap、byte[]之间的转换

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1、Drawable → Bitmap
Java代码收藏代码

    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;
    }

2、从资源中获取Bitmap

Java代码收藏代码

    Resources res=getResources();

    Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic);

3、Bitmap → byte[]

Java代码收藏代码

    private byte[] Bitmap2Bytes(Bitmap bm){
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
        return baos.toByteArray();
       }

4、 byte[] → Bitmap
Java代码收藏代码

    private Bitmap Bytes2Bimap(byte[] b){
                if(b.length!=0){
                    return BitmapFactory.decodeByteArray(b, 0, b.length);
                }
                else {
                    return null;
                }
          }