创建多个待处理的意图警报管理器并取消特定警报

Question

我正在尝试使用挂起的意图创建多个计划警报通知，并设置触发按钮以取消警报。我已经成功创建了一个警报并取消了它，但是在删除当前警报之前，我似乎无法创建多个警报。从那里我需要取消特定的警报。

这是我的代码：测试活动.java

    public class TestActivity extends AppCompatActivity {
    Button btnStart, btnCancel;
    AlarmManager alarmManager;
    Intent intent;
    PendingIntent pendingIntent;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test);
        btnStart = (Button) findViewById(R.id.btnStart);
        btnCancel = (Button) findViewById(R.id.btnCancel);
        alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        btnStart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                StartAlarm();
            }
        });
        btnCancel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                CancelAlarm();
            }
        });
    }
    void StartAlarm(){
        Calendar cal = Calendar.getInstance();
        cal.add(Calendar.SECOND, 5);
        String timeStamp = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(Calendar.getInstance().getTime());
        GlobalVariable.Alarm_ID += 1;
        intent = new Intent(this, AlarmReceiver.class);
        pendingIntent = PendingIntent.getBroadcast(this, GlobalVariable.Alarm_ID, intent, PendingIntent.FLAG_IMMUTABLE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            alarmManager.setExact(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), pendingIntent);
            Toast.makeText(this, "Alarm Set To : "  + cal.getTimeInMillis(), Toast.LENGTH_SHORT).show();
        }
    }
    void CancelAlarm(){
        intent = new Intent(this, AlarmReceiver.class);
        alarmManager.cancel(pendingIntent);
        Toast.makeText(this, "Alarm Canceled", Toast.LENGTH_SHORT).show();
    }
}

报警接收器.java

    public class AlarmReceiver extends BroadcastReceiver {
    Uri notificationSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    @Override
    public void onReceive(Context context, Intent intent) {
        String timeStamp = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(Calendar.getInstance().getTime());
        Intent notificationIntent = new Intent(context, InfoActivity.class);
        notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, notificationIntent, 0);
        NotificationCompat.Builder notifBuilder = new NotificationCompat.Builder(context, "Channel ID")
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle("Order Service")
                .setContentText("Alarm_ID : " + GlobalVariable.Alarm_ID + ". Time : " + timeStamp)
                .setGroup("Orders")
                .setAutoCancel(true)
                .setSound(notificationSound)
                .setContentIntent(pendingIntent)
                .setVibrate(new long[] { 1000, 1000, 1000, 1000, 1000 });
        NotificationManager notificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
        GlobalVariable.Alarm_ID = 1;
        notificationManager.notify(GlobalVariable.Alarm_ID, notifBuilder.build());
    }
}

程序中没有错误，我只是不知道在哪里更改以创建多个警报并取消其中的一些警报。

蒂亚

Answer 1

通过 ID 取消通知的方法：

    public static void cancelNotification(Context ctx, int notifyId) {
      String ns = Context.NOTIFICATION_SERVICE;
      NotificationManager nMgr = (NotificationManager) ctx.getSystemService(ns);
      nMgr.cancel(notifyId);
    }