Android告警启动新活动并重置告警

Question

我从早上开始就一直在搜索这个问题，并提到了stackoverflow上的大多数android警报问题。

我试着用不同的意图设置多个闹钟。在收到警报时，我希望取消警报，并将活动放在前面，以防它已经运行，或者如果它被杀死，则重新启动，但这次不应再次设置警报。我不希望其他的警报受到影响。当前的问题是，单击通知会再次启动活动并重置警报。如果我尝试使用alarmmanager.cancel取消它，它根本不会通知用户。这是我的代码，请帮助

我的MainActivity设置了多个警报

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Calendar cal = Calendar.getInstance();       //for using this you need to import java.util.Calendar;

    // add minutes to the calendar object
    cal.set(Calendar.DAY_OF_WEEK,Calendar.MONDAY);
    cal.set(Calendar.HOUR_OF_DAY, 22);
    cal.set(Calendar.MINUTE, 8);
//  cal.add(Calendar.MINUTE, 1);
    AlarmManager mgrAlarm = (AlarmManager) this.getSystemService(ALARM_SERVICE);
    ArrayList<PendingIntent> intentArray = new ArrayList<PendingIntent>();

    for(int i = 0; i < 10; ++i)
    {
       Intent intent = new Intent(this, AlarmReceiver.class);
       intent.putExtra("title", "notification no."+String.valueOf(i));
       intent.putExtra("NOTIFICATION_ID", String.valueOf(i));
       // Loop counter `i` is used as a `requestCode`
       PendingIntent pendingIntent = PendingIntent.getBroadcast(this, i, intent, 0);
       // Single alarms in 1, 2, ..., 10 minutes (in `i` minutes)
       mgrAlarm.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, 
                    SystemClock.elapsedRealtime() + 60000 * i, 
                    pendingIntent); 

       intentArray.add(pendingIntent);
    }
}

我的AlarmReceiver类

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

    NotificationManager manger = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
    Notification notification = new Notification(R.drawable.ic_launcher, "Alarm App", System.currentTimeMillis());

            Bundle extras=intent.getExtras();
            String title=extras.getString("title");
            int notif_id=Integer.parseInt(extras.getString("NOTIFICATION_ID"));

    //here we get the title and description of our Notification
                Class myclass = MainActivity.class;
            PendingIntent contentIntent = PendingIntent.getActivity(context, notif_id, 
                    new Intent(context, MainActivity.class), 0);
            String note=extras.getString("note");
            notification.setLatestEventInfo(context, note, title, contentIntent);
            notification.flags = Notification.FLAG_INSISTENT;
            notification.defaults |= Notification.DEFAULT_SOUND;
    //here we set the default sound for our 
    //notification   
            // The PendingIntent to launch our activity if the user selects this notification
            manger.notify(notif_id, notification);
}

};

Answer 1

在您的MainActivity中，您可以通过在intent中添加一个参数来区分启动和通知。您无论如何都需要通知id来取消特定的通知。因此，您可以在MainActivity中尝试执行以下操作

  @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Intent appIntent = this.getIntent();
        int notif_id = appIntent.getIntExtra( "my_notification_id", -1 ) ;
        if( notif_id != -1 )
        {
            Log.d ( "LOG_TAG",  "Launched from Notification ");
            NotificationManager nm = (NotificationManager) getSystemService(     NOTIFICATION_SERVICE );
            nm.cancel( notif_id );

           /* Do the separate processing here */
           .....
        }
        else
        {
            /* Your previous onCreate code goes here */

在文件AlarmReceiver.java中，您需要进行以下更改

//PendingIntent contentIntent = PendingIntent.getActivity(context, notif_id, new           Intent(context, MainActivity.class), 0);

Intent appIntent = new Intent(  context, MainActivity.class );
appIntent.putExtra( "my_notification_id", notif_id );
PendingIntent contentIntent = PendingIntent.getActivity(context, notif_id, appIntent, 0);

希望这能有所帮助。