Question

我想创建一个在通知中显示的计数器。即使屏幕被锁定，更新的通知也应一直保持更新（或者当屏幕显示带有通知的锁定屏幕时，应更新更新的通知。

我创建了服务来更新通知中的文本。解锁设备屏幕后，一切都很好（通知一直在更新）。当设备屏幕锁定时，服务仅在一段时间内更新通知。

服务：

public class MySimpleService extends Service {

private Notifi notifi;
private SimpleCounter counter;

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public void onCreate() {
    super.onCreate();
    notifi = new Notifi(this);
    startForeground(NOTIFICATION_ID, notifi.getNotification());
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    int countTo = 100;
    counter = new SimpleCounter(countTo, tic -> notifi.updateText(Integer.toString(tic)));
    counter.start();
    return super.onStartCommand(intent, flags, startId);
}

@Override
public void onDestroy() {
    stopForeground(true);
    super.onDestroy();
}
}

计数器：

public class SimpleCounter {

public interface Listener {
    void tic(int tic);
}

private int countTo;
private Listener listener;

public SimpleCounter(int countTo, Listener listener){
    this.countTo = countTo;
    this.listener = listener;
}

public void start(){
    for (int i = 0; i < countTo; i++) {
        wait1sec();
        tic(i);
    }
}

private void tic(int i) {
    listener.tic(i);
}

private void wait1sec() {
    try {
        Thread.sleep(1000L);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}
}

我如何运行服务：

Intent intent = new Intent(this, MySimpleService.class);
ContextCompat.startForegroundService(this, intent);

屏幕锁定时，Oreo Service并非始终都在更新通知

0 个答案: