变化imgae路径后，应通知库进行更新，所以你应该发送广播做出来。


4.4前，你可以调用这个：

After change imgae path,you should notify the gallery to update,so you should send a broadcast to make it.
Before 4.4,you can call this:

sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,Uri.parse("file://"+Environment.getExternalStorageDirectory())));  

4.4后，试试这个：

After 4.4,try this:

sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + file)));
//the file is new image's path