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我正在尝试编写一个包含倒数计时器的活动。我通过一个新线程创建它，当应用程序被发送到后台时，这个倒数计时器继续在他的线程中运行；问题是当我再次开始活动时；这会创建另一个执行相同操作的线程。

那么，有什么方法可以“恢复”在应用程序发送到后台之前创建的先前线程，而无需创建新副本？

这是代码：

public class MainActivity extends FragmentActivity{

private static final String TAG = Values.Tags.MAIN_ACTIVITY;
private TextView timeTextView;
final Handler mHandler = new Handler();

@Override
protected void onCreate(Bundle savedInstanceState) {
    // GENERAL ACTIVITY TASKS (all activities should do these).
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // MAIN_ACTIVITY TASKS.
    timeTextView = (TextView) findViewById(R.id.activityMain_timer);

    createThread();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

public void buttonPressed(View view){
    DialogFragment newFragment = new TimePickerFragment();
    newFragment.show(getSupportFragmentManager(), "timePicker");
}

public static class TimePickerFragment extends DialogFragment implements TimePickerDialog.OnTimeSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Create a new instance of TimePickerDialog and return it
        return new TimePickerDialog(getActivity(), this, 0, 0, true);
    }

    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        Log.d(TAG, "set time");
        getPickedTime(hourOfDay, minute);
    }

}

public static void getPickedTime(int hourOfDay, int minute) {
    Log.d(TAG, "Hora: "+hourOfDay+", minute: "+minute);
}

private void createThread() {
    Thread thread = new Thread(){
        public void run(){
            try {
                Thread.sleep(10000);
            } catch (InterruptedException e){
                Log.d(TAG, e.getMessage());
            }
            Log.d(TAG, this.getName()+ " is about to complete...");
            mHandler.post(doAction);
        }
    };
    thread.setName("thread00");
    thread.start();
}

final Runnable doAction = new Runnable(){
    public void run(){
        Log.d(TAG, "Completed.");
    }
};

}

谢谢。

4

3 回答 3

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在您的线程中创建一个变量

Boolean isRunning = false;

当您的线程开始时，将其放入应用程序共享首选项中，如下所示..

isRunning = true;
SharedPreferences settings = getSharedPreferences("isThreadRunning", 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("isRunning", isRunning);
editor.commit();

现在，当线程完成时，只需将其更改回 false。

isRunning = false;

在 OnCreate() 中，读取相同的首选项

SharedPreferences settings = getSharedPreferences("isThreadRunning", 0);
boolean running = settings.getBoolean("silentMode", false); 

if(running){
   //Thread already running
}else{
   //the thread isnt running so lets start it.
}
于 2013-01-30T12:12:17.517 回答
0

我假设我想要做的事情是不可能仅使用线程的。我想我应该使用服务。

于 2013-01-30T09:19:27.733 回答
0

如果您可以发布您的代码，我会更好。现在只是通过猜测我给出了一些建议，在 oncreate 方法中而不是在 onresume 中启动你的线程。在 ondestroy 中销毁活动时停止线程。

于 2013-01-25T05:00:24.197 回答