bimap压缩

public static Bitmap bitmapRoom(Bitmap srcBitmap,int newWidth,int newHeight)
	{
		int srcWidth = srcBitmap.getWidth();   
        int srcHeight = srcBitmap.getHeight();    
  
        float scaleWidth = ((float) newWidth) / srcWidth;   
        float scaleHeight = ((float) newHeight) / srcHeight;   
  
        Matrix matrix = new Matrix();   
        matrix.postScale(scaleWidth, scaleHeight);     
        Bitmap resizedBitmap = Bitmap.createBitmap(srcBitmap, 0, 0, srcWidth,   
        		srcHeight, matrix, true);
        if(resizedBitmap != null)
        {
        	return resizedBitmap;
        }
        else
        {
        	return srcBitmap;
        }
		
	}