Bitmap 和 Drawable之間的轉化關係。

http://blog.csdn.net/yang1z1/article/details/6709855

(轉)Android Bitmap 與 Drawable之間的轉換

轉換Bitmap to Drawable

1. Bitmap bitmap = new Bitmap (...);       
2. Drawable drawable = new BitmapDrawable(bitmap);

轉換Drawable to Bitmap

1. Drawable d = ImagesList.get(0);    
2. Bitmap bitmap = ((BitmapDrawable)d).getBitmap(); 
   

1、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;
}

2、從資源中獲取Bitmap

Resources res=getResources();

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

3、Bitmap → byte[]

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

4、 byte[] → Bitmap 

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

以上是我在實踐中遇到的一些轉換，以後遇到類似的就不用到處找了，希望對大家也有一點用處！

http://bingtian.iteye.com/blog/642128