Drawable、Bitmap、byte[]之间的转换

1、Drawable → Bitmap

Java代码  

1. public static Bitmap drawableToBitmap(Drawable drawable) {   
2.            
3.         Bitmap bitmap = Bitmap   
4.                         .createBitmap(   
5.                                         drawable.getIntrinsicWidth(),   
6.                                         drawable.getIntrinsicHeight(),   
7.                                         drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888   
8.                                                         : Bitmap.Config.RGB_565);   
9.         Canvas canvas = new Canvas(bitmap);   
10.         //canvas.setBitmap(bitmap);   
11.         drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());   
12.         drawable.draw(canvas);   
13.         return bitmap;   
14. }  

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  

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

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

 

3、Bitmap → byte[]

 

Java代码  

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

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  

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.       }