handler 警告This Handler class should be static or leaks might occur 的回调解决方法

As others have mentioned the Lint warning is because of the potential memory leak. You can avoid the Lint warning by passing a Handler.Callback when constructing Handler (i.e. you don't subclass Handlerand there is no Handler non-static inner class):
Handler mIncomingHandler = new Handler(new Handler.Callback() {    @Override    public boolean handleMessage(Message msg) {    }});
As I understand it, this will not avoid the potential memory leak. Message objects hold a reference to the mIncomingHandler object which holds a reference the Handler.Callback object which holds a reference to the Service object. As long as there are messages in the Looper message queue, the Service will not be GC. However, it won't be a serious issue unless you have long delay messages in the message queue.