Bitmap與Drawable,byte[]之間的轉化

android在處理一寫圖片資源的時候，會進行一些類型的轉換，現在有空整理一下，以便於以後隨時可用

1、drawable---->bitmap

View Code

 1 public static Bitmap drawableToBitmap(Drawable drawable) {              2        Bitmap bitmap = Bitmap    3                        .createBitmap(    4                                       drawable.getIntrinsicWidth(),    5                                        drawable.getIntrinsicHeight(),    6                                       drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888    7                                                       : Bitmap.Config.RGB_565);           Canvas canvas = new Canvas(bitmap);    8        //canvas.setBitmap(bitmap);    9        drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());   10         drawable.draw(canvas);   11        return bitmap;   12 }  

2、從資源中擷取Bitmap：drawable---->bitmap

View Code

1 Resources res=getResources();     2 Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic);  3 //或者這種方法也行，這兩種方法都一樣4 Bitmap bmp = ((BitmapDrawable)this.getResources.getDrawable(R.drawable.pic)).getBitmap();

3、bitmap---->drawable

View Code

1 /** 2     * Bitmap轉化為drawable 3     * @param bitmap 4     * @return 5     */  6     public static Drawable bitmap2Drawable(Bitmap bitmap){  7         return new BitmapDrawable(bitmap) ;  8     }  

4、bitmap---->byte[]

View Code

1 private byte[] Bitmap2Bytes(Bitmap bm){   2     ByteArrayOutputStream baos = new ByteArrayOutputStream();     3     bm.compress(Bitmap.CompressFormat.PNG, 100, baos);     4     return baos.toByteArray();   5    }  

5、byte[]---->bitmap

View Code

1 private Bitmap Bytes2Bimap(byte[] b){   2             if(b.length!=0){   3                 return BitmapFactory.decodeByteArray(b, 0, b.length);   4             }   5             else {   6                 return null;   7             }   8      }