Drawable Bitmap byte[]的转换

android在处理一写图片资源的时候，会进行一些类型的转换：

1、Drawable → Bitmap 的简单方法 ((BitmapDrawable)res.getDrawable(R.drawable.youricon)).getBitmap();

2、Drawable → Bitmap Java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; } 

3.Bitmap→Drawable   的简单方法 BitmapDrawable bitmapDrawable = (BitmapDrawable)bitmap; Drawable drawable = (Drawable)bitmapDrawable;    

Bitmap bitmap = new Bitmap (…); Drawable drawable = new BitmapDrawable(bitmap);  

3、从资源中获取Bitmap Java代码 Resources res=getResources(); 

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

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

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