1、Drawable → Bitmap

Java代码public static Bitmap drawableToBitmap(Drawable drawable) {   
  1.            
  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);   
  8.         Canvas canvas = new Canvas(bitmap);   
  9.         //canvas.setBitmap(bitmap);   
  10.         drawable.setBounds(00, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());   
  11.         drawable.draw(canvas);   
  12.         return bitmap;   
  13. }  

 

2、从资源中获取Bitmap

 

Java代码 Resources res=getResources();   
  1.   
  2. Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic);  

 

3、Bitmap → byte[]

 

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

 
4、 byte[] → Bitmap

Java代码
  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.       }