java - 使用定时器时java中的"Variable might not have been initialized"

Question

这个问题已经有答案了:

"Variable example might not have been initialized" in anonymous class (3 个回答)

已关闭 6 年前。

这是我在 fragment 中的代码:

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View view= inflater.inflate(R.layout.fragment_profile, container, false);
    profile();
    textView = (TextView) view.findViewById(R.id.textViewUsername);
    listView = (ListView) view.findViewById(R.id.listView);
    timer_start();
    return view;
}

public void timer_start(){
    final Runnable mTicker = new Runnable() {
        @Override
        public void run() {
            sendRequest();
            handler.postDelayed(mTicker, 5000); // error shows only for this line
        }
    };

    handler.postDelayed(mTicker, 5000);
}

我想每5秒执行一次sendRequest()函数。但它显示错误:“当我调用timer_start() fragment 时，变量mTicker可能尚未初始化。

Answer 1

您在初始化的同一行中引用了 mTicker。这是不允许的。这就像说:

String s = s;

这没有意义。尝试使用“this”:

handler.postDelayed(this, 5000);