Question

我正在尝试使用AlarmManager和Service

实现警报应用程序

在我的活动中，我已声明以下内容以启动警报服务

Intent intent = new Intent(getApplicationContext(), OnAlarmManager.class);
PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(),
        234324243, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+(i * 1000), pendingIntent);
Toast.makeText(getApplicationContext(), "Alarm set in " + i + " seconds", Toast.LENGTH_LONG).show();

我的OnAlarmManager代码如下所示

public class OnAlarmManager extends Service{
    private static final String TAG = "OnAlarmReceiver";

    private NotificationManager nm;

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

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        Intent mainActivityIntent = new Intent(this, MainActivity.class);
        PendingIntent pIntent = PendingIntent.getActivity(this, 0, mainActivityIntent, 0);

        //setting up notification
        Notification notification = new NotificationCompat.Builder(this)
                .setContentTitle("New Notification")
                .setContentText("This is a successfull app on service")
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentIntent(pIntent)
                .build();
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        notification.flags |= Notification.FLAG_SHOW_LIGHTS;
        notification.defaults |= Notification.DEFAULT_SOUND;
        notification.defaults |= Notification.DEFAULT_VIBRATE;
        notification.defaults |= Notification.DEFAULT_LIGHTS;
        nm.notify(0, notification);
        Toast.makeText(getApplicationContext(), "Alarm has begun", Toast.LENGTH_LONG).show();
        Log.i(TAG, "Alarm has begun");
         return START_STICKY;
    }
}

现在，当我尝试运行此操作时，即使我在设置警报后关闭应用程序，也会在JellyBean上运行的设备中的给定时间触发通知。但是在Marshmallow上运行的设备中，应用程序关闭时永远不会触发服务类

我在这里缺少什么？

Answer 1

你能试试前台服务吗？ http://www.vogella.com/tutorials/AndroidServices/article.html

根据你的说法，服务似乎在主线程上运行，它会与应用程序一起被杀死。

Answer 2

为此，请尝试将AlarmManager.setExact与IntentService一起使用。您的代码将如下所示：

Intent intent = new Intent(OnAlarmManager.ACTION_TRIGGER_ALARM);
PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(),
        234324243, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
Toast.makeText(getApplicationContext(), "Alarm set in " + i + " seconds", Toast.LENGTH_LONG).show();

if (android.os.Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
    alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+(i * 1000), pendingIntent);
} else {
    alarmManager.setExact(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+(i * 1000), pendingIntent);
}

您的服务将类似于：

public class OnAlarmManager extends IntentService {
    public static final String ACTION_TRIGGER_ALARM = "com.example.myapplication.ACTION_TRIGGER_ALARM";

    private static final String TAG = "OnAlarmReceiver";

    private NotificationManager nm;

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

    @Override
    protected void onHandleIntent(Intent intent) {
        nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        Intent mainActivityIntent = new Intent(this, MainActivity.class);
        PendingIntent pIntent = PendingIntent.getActivity(this, 0, mainActivityIntent, 0);

        //setting up notification
        Notification notification = new NotificationCompat.Builder(this)
                .setContentTitle("New Notification")
                .setContentText("This is a successfull app on service")
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentIntent(pIntent)
                .build();
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        notification.flags |= Notification.FLAG_SHOW_LIGHTS;
        notification.defaults |= Notification.DEFAULT_SOUND;
        notification.defaults |= Notification.DEFAULT_VIBRATE;
        notification.defaults |= Notification.DEFAULT_LIGHTS;
        nm.notify(0, notification);
        Log.i(TAG, "Alarm has begun");
    }
}

并在AndroidManifest.xml中添加操作信息：

<service
    android:name=".OnAlarmManager"
    android:exported="true">
    <intent-filter>
        <action android:name="com.example.myapplication.ACTION_TRIGGER_ALARM" />
    </intent-filter>
</service>

Answer 3

只需在Manifest.xml文件中注册服务

即可

<service android:name=".YourServiceClassName" />

应用关闭时服务未运行

3 个答案: