警报不在同一日期触发 [英] Alarm is not triggering on the same Date

问题描述

我想在特定时间重启设备，所以我为此使用了警报管理器。以下是我的活动代码。

I want to reboot device on particular time so i am using alarm manager for that.below is the code of my activity.

public class MainActivity extends AppCompatActivity {

    private static int timeHour = Calendar.getInstance().get(Calendar.HOUR_OF_DAY);
    private static int timeMinute = Calendar.getInstance().get(Calendar.MINUTE);
    AlarmManager alarmManager;
    private PendingIntent pendingIntent;


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

        alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        Intent myIntent = new Intent(MainActivity.this, AlarmReceiver.class);
        pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, myIntent, 0);
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.set(Calendar.HOUR_OF_DAY, 11);
        calendar.set(Calendar.MINUTE, 02);
        alarmManager.cancel(pendingIntent);
//        if(Calendar.getInstance().after(calendar)){
//            // Move to tomorrow
//            calendar.add(Calendar.DATE, 1);
//        }
      alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),AlarmManager.INTERVAL_DAY, pendingIntent);

//
//        alarmManager.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
//                SystemClock.elapsedRealtime() + AlarmManager.INTERVAL_DAY,
//                AlarmManager.INTERVAL_DAY, pendingIntent);
    }
}

这是我的接收者

 public class AlarmReceiver extends BroadcastReceiver {

    public static void rebootDevice() {
        try {
            Process process = Runtime.getRuntime().exec("su");
            DataOutputStream os = new DataOutputStream(process.getOutputStream());
            os.writeBytes("reboot \n");
        } catch (Throwable t) {

            t.printStackTrace();
        }
    }

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

        Toast.makeText(context, "Triggered", Toast.LENGTH_SHORT).show();
        Log.d("Gajanand", "onReceive: Triggered");

        rebootDevice();

    }
}

代码可以正常工作，但不能正常工作在确切的日期。例如，如果我现在运行相同的代码。如果我更改触发日期，警报不会触发。我没有收到代码的问题，触发警报有10秒的延迟。任何帮助

Yes code is working fine but not on the exact date.for example if i run the same code now. alarm not triggers if i change the date it triggers. i am not getting what is the problem with code and there is 10 seconds delay in triggering alarm. any help

推荐答案

您的代码有两个问题：

Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, 11);
calendar.set(Calendar.MINUTE, 02);

此处您要设置 HOUR_OF_DAY 和 MINUTE ，但 SECOND 字段仍具有其初始值，因此不会在$ b分钟一刻触发警报$ b（除非您确切地在分钟内调用了 calendar.setTimeInMillis（System.currentTimeMillis（）），这不太可能。）

Here you're setting HOUR_OF_DAY and MINUTE but the SECOND field still has its initial value, so the alarm won't be triggered exactly on the minute (unless you called calendar.setTimeInMillis(System.currentTimeMillis()) exactly on the minute, which is quite unlikely).

应该是这样的：

Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, 11);
calendar.set(Calendar.MINUTE, 2);
calendar.set(Calendar.SECOND, 0); // setting seconds to 0

setRepeating（）不精确，无法与Doze配合使用。

setRepeating() is inexact and doesn't work with Doze.

要获取确切的触发时间，您应该使用确切的警报，请检查示例。

For exact trigger times you should use exact alarms, check this answer for an example.

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