在Fragment中每秒执行一次方法 - 第二次运行时为NULL值

时间:2017-03-19 18:38:01

标签: java android multithreading android-activity fragment

我们从onCreate方法获取someID的值。当onCreateView方法第一次运行时,一切都很好。但是,在第二次运行(1000间隔后),someID值为NULL。我们如何确保这个someID值是粘性的?请记住,此线程存在于片段

@Override
        public void onCreate(Bundle savedInstanceState){
            super.onCreate(savedInstanceState);
            someID = getArguments().getString(SOME_ID_KEY);

        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
            View v = inflater.inflate(R.layout.fragment_game, container, false);
            Toast.makeText(getActivity(), someID, Toast.LENGTH_SHORT).show();

            handler.postDelayed(new Runnable() {
                @Override
                public void run() {

                    System.out.print(someID); // works on 1st time but not any other future runs of the 1k interval
                    handler.postDelayed(this, 1000);
                }
            }, 1000);

1 个答案:

答案 0 :(得分:1)

你可以这样做

private void printId(){
    handler.postDelayed(new Runnable() {
            @Override
            public void run() {

                System.out.print(someID); // works on 1st time but not any other future runs of the 1k interval
                printId();
            }
        }, 1000);
}

并在onCreateView中将所有处理程序代码替换为:

pirntId();