Question

此应用程序允许我启动一项服务来提醒我饮酒。如果我单击通知，我想查看该服务是否正在运行，但是使用Intent.putExtra方法没有任何输出。

我的MainActivity类：

Boolean isServiceRunning = false;
AlarmManager alarmManager;
PendingIntent pendingIntent;
TextView mainText;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mainText = findViewById(R.id.mainTextView);

    Bundle extras = getIntent().getExtras();
    if (extras == null) {
            mainText.setText("Service is paused");
    } else {
        mainText.setText("Service is running");
    }

}

public void sendNotification(View view) {

    if (!isServiceRunning) {
        isServiceRunning = true;
        Toast.makeText(this, "Reminder service started.", Toast.LENGTH_SHORT).show();
        alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

        mainText.setText("Service is running.");
        Intent i = new Intent(this, reciever.class);
        i.putExtra("isServiceRunning", isServiceRunning.booleanValue());

        pendingIntent = PendingIntent.getBroadcast(this, 100, i, PendingIntent.FLAG_UPDATE_CURRENT);

        Calendar calendar = Calendar.getInstance();
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 1000 * 60 * 10, pendingIntent);
    } else {
        isServiceRunning = false;
        Toast.makeText(this, "Reminder service ended.", Toast.LENGTH_SHORT).show();
        mainText.setText("Service paused.");
        alarmManager.cancel(pendingIntent);
    }
}

我认为可以使用共享首选项解决此问题，但这不是一个好的解决方法。

编辑：

我的广播接收器课程：

public class reciever BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {

    Intent notificationIntent = new Intent(context, drinkReminder.class);

    TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
    stackBuilder.addParentStack(drinkReminder.class);
    stackBuilder.addNextIntent(notificationIntent);

    PendingIntent pendingIntent = stackBuilder.getPendingIntent(100, PendingIntent.FLAG_UPDATE_CURRENT);


    NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
    Notification notification = new NotificationCompat.Builder(context, CHANNEL_1_ID)
            .setContentTitle("Title")
            .setContentText("description")
            .setSmallIcon(R.drawable.icon_waterdrop)
            .setTimeoutAfter(30000)
            .setContentIntent(pendingIntent)
            .setAutoCancel(true)
            .build();

    notificationManager.notify(0, notification);

}

}

Answer 1

代替onCreate（）和putExtra（）中的代码，您可以在每种情况下创建两个挂起的Intent，每个Intent使用不同的广播接收器。在该广播接收器中，您可以打印单独的吐司消息。

MyBroadcastRecieverStart.java

 public class MyBroadcastReceiverStart extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {

Toast.makeText(this, "Reminder service started.", Toast.LENGTH_SHORT).show();

}
}

MyBroadcastReceiverStop.java

public class MyBroadcastReceiverStop extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {

Toast.makeText(this, "Reminder service ended.", Toast.LENGTH_SHORT).show();

}
}

SendNotification方法-

public void sendNotification(View view) {

if (!isServiceRunning) {
    isServiceRunning = true;

    alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

    mainText.setText("Service is running.");
    Intent i = new Intent(this, MyBroadcastReceiverStart.class);


    pendingIntent = PendingIntent.getBroadcast(this, 100, i, PendingIntent.FLAG_UPDATE_CURRENT);

    Calendar calendar = Calendar.getInstance();
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 1000 * 60 * 10, pendingIntent);
} else {
    isServiceRunning = false;

    mainText.setText("Service paused.");
    Intent i = new Intent(this, MyBroadcastReceiverStop.class);


    pendingIntent = PendingIntent.getBroadcast(this, 100, i, PendingIntent.FLAG_UPDATE_CURRENT);

    Calendar calendar = Calendar.getInstance();
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 1000 * 60 * 10, pendingIntent);
    alarmManager.cancel(pendingIntent);
}
}

如果您在else块中编写alarmManager.cancel（pendingIntent），它将取消一个不存在的意图，因为您已经在if块中创建了该意图，并且如果else被执行则不会创建，因此我创建了意图阻止其他人。

Answer 2

您正在将“附加”添加到传递给Intent的{{1}}上。此“额外”将包含在AlarmManager中传递给您的BroadcastReceiver的Intent中，但您对此不做任何事情。

当您单击onReceive()时，它将启动Notification，我希望它是drinkReminder。

您也在评论中说：

您能再告诉我一件事吗？有时如果我按按钮启动服务，大约10分钟后会出现通知秒，此后它将显示应有的所有10分钟。我怎么能够解决这个问题？

这是您设置闹钟的代码：

Activity

当您调用Calendar calendar = Calendar.getInstance(); alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 1000 * 60 * 10, pendingIntent);时，第二个参数指定警报第一次响起，第三个参数指定重复间隔。您已经告诉警报管理器，您希望第一个警报立即触发，然后在之后每10分钟触发一次。

如果您希望在按下按钮10分钟后触发第一个警报，则需要调整第二个参数，使其代表未来10分钟的时间，例如：

setRepeating()

Intent .putExtra使用PendingIntent返回null

2 个答案: