无论设置的时间是什么,在1分钟后,AlarmManager的setRepeating()会重复(在这种情况下为5秒,API 18+)

Question

我将重复时间设置为5秒.第一次吐司在5秒后出现,但下一次在1分钟后重复一次.
我也尝试了使用setRepeating()的代码,它仍然不起作用.
这是我的代码:

public void constructJob(){

    Intent alertIntent = new Intent(this, AlarmManagerService.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(
            this, 0,
            alertIntent,
            PendingIntent.FLAG_UPDATE_CURRENT);

    AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    alarmManager.setInexactRepeating(
            AlarmManager.RTC_WAKEUP,
            GregorianCalendar.getInstance().getTimeInMillis(),
            repeatTime(),
            pendingIntent
    );

}

public long repeatTime(){
    return 5000;
}

AlarmManagerService.java

public class AlarmManagerService extends BroadcastReceiver {
      @Override
      public void onReceive(Context context, Intent intent) {
             Toast.makeText(context, "5 seconds have passed",
                            Toast.LENGTH_SHORT).show();
}

Answer 1

文档需要更新.截至我认为Android 5.1(API版本22),重复警报的最短时间为1分钟,未来警报的设置时间不能少于5秒.

如果您需要在一分钟内完成工作,只需直接设置闹钟,然后从该闹钟的处理程序中设置下一个闹钟等.

如果您需要在5秒内完成工作,请将其发布到处理程序而不是使用警报管理器？

Answer 2

不要使用setRepeating()或setInExactRepeating,它不会在5秒后重复.相反,尝试安排一次警报,然后在onReceive()方法中再次重新安排它,就像这样.这将在特定时间间隔后重复(在这种情况下为5秒)

MainActivity.java

public class MainActivity extends AppCompatActivity {

Button btnStartAlarm, btnStopAlarm;

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

    btnStartAlarm = (Button) findViewById(R.id.btnStartAlarm);
    btnStopAlarm = (Button) findViewById(R.id.btnStopAlarm);

    Intent intent = new Intent(MainActivity.this, AlarmReceiver.class);
    final PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 100, intent, 0);

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

    btnStartAlarm.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 5000, pendingIntent);
        }
    });

    btnStopAlarm.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            alarmManager.cancel(pendingIntent);
        }
    });
}
 }

AlarmReceiver.java

public class AlarmReceiver extends BroadcastReceiver {
public AlarmReceiver() {
}

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

    Log.d("Javed", "onReceive called");
    Toast.makeText(context, "onReceive called", Toast.LENGTH_LONG).show();

    Intent intent1 = new Intent(context, AlarmReceiver.class);
    final PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 100, intent1, 0);
    final AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 5000, pendingIntent);
}
  }