BitMap、Drawable、inputStream及byte[] 互转

1、Drawable → Bitmap

    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

Resources res=getResources();

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

3、Bitmap → byte[]

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

4、 byte[] → Bitmap

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

5. InputStream→ byte[]

private byte[] getBytes(InputStream is) throws IOException {

ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] b = new byte[1024];
int len = 0;

while ((len = is.read(b, 0, 1024)) != -1)
{
baos.write(b, 0, len);
baos.flush();
}
byte[] bytes = baos.toByteArray();
return bytes;
}