java - 安卓把new thread写在onCreate()里面不会运行？

Question

今天写了一个线程在onCreate里面，结果它不运行。我犯错了？？

这个子线程在哪里开start(),有关系吗？我以为无论在哪里开了，它就是特立独行的了？？

新手，理解不是很全....

你觉得呢？

public void onCreate() {
        super.onCreate();
        player = new MediaPlayer();
        player.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mediaPlayer) {

                mListener.onNextPlay(true);

            }
        });

        new Thread() {


            @Override
            public void run() {

                final int millis = 100;

                try {
                    sleep(millis);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                if (player.isPlaying() && player != null) {
                    mListener.onPlaying(player.getCurrentPosition(), player.getDuration());

                    Log.i("ddd", Integer.toString(player.getCurrentPosition()));

                }

            }
        }.start();

    }

Log.i("ddd", Integer.toString(player.getCurrentPosition()));

这句没有信息弹出，如果歌曲播放了，它会不断输出播放进度的数字才是....

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经过添加log，得知这个线程是一开始就运行的，但是sleep一次后，就好像没有醒过来一样....没信息输出

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解决疑惑：能运行，就是要加一个while循环......

Answer 1

onCreate is only run once when creating the activity, and this thread has ended when it runs the last line of the run.
I am also a newbie, please correct me if there are any mistakes.

Answer 2

It will definitely be implemented. But if you call the same object in different threads, you need to carefully check whether there is a competition relationship. Whether synchronization protection is required.

Answer 3

Log at the beginning of the run function to determine whether it is running

Answer 4

Ah, I should write a while loop...

new Thread() {


            @Override
            public void run() {

                Log.i("ddd", "running");

                final int millis = 100;
                
                while (true) {

                    try {

                        sleep(millis);

                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }

                    if (player.isPlaying() && player != null) {
                        mListener.onPlaying(player.getCurrentPosition(), player.getDuration());

                        Log.i("ddd", Integer.toString(player.getCurrentPosition()));

                    }

                }



            }

        }.start();