Drawable、Bit地图、byte[]之间的转换

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.      }