如何在应用程序关闭后保留警报管理器运行？

Question

我想要我的 MainActivity.java 文件中的 AlarmManager 每分钟都会触发一个 IntentService。

我写的代码是：

public void scheduleAlarm() {
    Intent intent = new Intent(getApplicationContext(), MyAlarmReceiver.class);
    final PendingIntent pendingIntent = PendingIntent.getBroadcast(this, MyAlarmReceiver.REQEST_CODE, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    long firstMillis = System.currentTimeMillis();
    AlarmManager alarm = (AlarmManager) this.getSystemService(Context.ALARM_SERVICE);
    alarm.setRepeating(AlarmManager.RTC_WAKEUP, firstMillis, 60000, pendingIntent);
}

这是我的 IntentService：

public class MyTestService extends IntentService {

    public MyTestService() {
        super("MyTestService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        Log.d("tag_tag_tag", "Service running");

        String filename = "example.txt";
        String fileContents = "\ndone ";
        FileOutputStream fos = null;

    try {
            fos = openFileOutput(filename, MODE_APPEND);
            fos.write(fileContents.getBytes());
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
       }

    }
}

这里我只是附加到一个文件，只是为了检查服务是否在应用程序关闭后运行，但它没有。

这是我的接收器： public class MyAlarmReceiver 扩展 BroadcastReceiver {

    public static final int REQEST_CODE = 12345;
    public static final String ACTION = "com.always_in_beta.bekar";

    @Override
    public void onReceive(Context context, Intent intent) {
        Intent i = new Intent(context, MyTestService.class);
        i.putExtra("foo", "bar");
        context.startService(i);
    }
}

我希望即使在应用程序关闭后每分钟在后台触发此服务。

Answer 1

AlarmManager 的使用非常不可靠，尤其是从 Android M 开始。 phone 瞌睡模式会忽略警报事件。我使用 Firebase JobDispatcher https://github.com/firebase/firebase-jobdispatcher-android 非常适合这个目的。代码： Gradle:

implementation 'com.firebase:firebase-jobdispatcher:0.8.5'

工作class：

import com.firebase.jobdispatcher.JobParameters;
import com.firebase.jobdispatcher.JobService;

public class MyTestService extends JobService {
@Override
public boolean onStartJob(JobParameters job) {
    // something like
 Log.d("tag_tag_tag", "Service running");

    String filename = "example.txt";
    String fileContents = "\ndone ";
    FileOutputStream fos = null;

try {
        fos = openFileOutput(filename, MODE_APPEND);
        fos.write(fileContents.getBytes());
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (fos != null) {
            try {
                fos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
   }

    return false; // Answers the question: "Is there still work going on?"
}

@Override
public boolean onStopJob(JobParameters job) {
    return false; // Answers the question: "Should this job be retried?"
}

}

清单：

<service
android:exported="false"
android:name=".MyTestService">
<intent-filter>
    <action android:name="com.firebase.jobdispatcher.ACTION_EXECUTE"/>
</intent-filter>

在您的 activity 中，创建调度程序：

// Create a new dispatcher using the Google Play driver.
FirebaseJobDispatcher dispatcher = new FirebaseJobDispatcher(new GooglePlayDriver(context));

然后安排作业：

Job myJob = dispatcher.newJobBuilder()
.setService(MyTestService.class) // the JobService that will be called
.setTag("my-unique-tag")        // uniquely identifies the job
.setRecurring(true)
.setTrigger(Trigger.executionWindow(1*60-10,1*60+10))//1 minute +/- 10 seconds
.build();

dispatcher.mustSchedule(myJob);

这应该有用，至少对我有用。

如何在应用程序关闭后保留警报管理器运行？

How to keep Alarm Manager running even after the app closes?

android

alarmmanager

intentservice

如何在应用程序关闭后保留警报管理器 运行？

How to keep Alarm Manager running even after the app closes?

android

alarmmanager

intentservice

如何在应用程序关闭后保留警报管理器运行？