AlarmManager 延迟触发或根本不触发

Question

大家好，我正在尝试学习如何在 Android 中使用 AlarmManager 和 BroadcastReceiver。 AlarmManager 我遇到了一些问题：我在 1 分钟的距离设置了两个警报，但只有一个触发，而且晚了几分钟（我猜无法预测）。

这是我的主要 activity（我通过点击按钮设置闹钟）

public class MainActivity extends AppCompatActivity {
    AlarmManager alarmManager;
    Intent intent;
    PendingIntent pendingIntent;
    AtomicInteger atomicInteger;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        intent = new Intent(Constants.EXTENDED_DATA_STATUS);
        atomicInteger = new AtomicInteger();
        setContentView(R.layout.activity_main);

        Button startButton = (Button) findViewById(R.id.start_button);

        startButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int id = atomicInteger.incrementAndGet();
                pendingIntent = PendingIntent.getBroadcast(getApplicationContext(),id,intent,0);
                Calendar firstLullo = Calendar.getInstance();
                Calendar secondLullo = Calendar.getInstance();
                firstLullo.set(Calendar.HOUR_OF_DAY,10);
                firstLullo.set(Calendar.MINUTE,55);
                secondLullo.set(Calendar.HOUR_OF_DAY,10);
                secondLullo.set(Calendar.MINUTE,56);
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                    alarmManager.setExact(AlarmManager.RTC_WAKEUP,firstLullo.getTimeInMillis(),pendingIntent);
                    alarmManager.setExact(AlarmManager.RTC_WAKEUP,secondLullo.getTimeInMillis(),pendingIntent);
                }
                Log.d("ALARM","settato con id " + String.valueOf(id));
            }
        });
    }
}

我的接收器只是显示一个 Toast 并使 phone 振动。 Constants.EXTENDED_DATA_STATUS 是来自 Constants class 的字符串，它被添加到 Android Manifest 中我 Receiver 的 intent-filter。

我错过了什么？我在谷歌上搜索了很多，只发现我必须使用 setExact() 但没有运气..

提前致谢

Answer 1

只有一个触发的原因是因为你取消你的第一个总是

From the docs: If there is already an alarm scheduled for the same IntentSender, that previous alarm will first be canceled.

要解决此问题，请对两个警报使用不同的 PendingIntents。

- 要让您的接收器发射多次次，请在您的 onReceive()

中重新安排

示例： 仅当您希望两个接收器彼此分开时！

//Declare AlarmManager
AlarmManager am = (AlarmManager) LayoutActivity.this.getSystemService(ALARM_SERVICE);

//create new calendar instance for your first alarm
Calendar startTime= Calendar.getInstance();

//set the time of your first alarm
firstLullo.set(Calendar.HOUR_OF_DAY,10);
firstLullo.set(Calendar.MINUTE, 55);
firstLullo.set(Calendar.SECOND, 0);

//create a pending intent 
PendingIntent firstPI = PendingIntent.getBroadcast(yourActivity.this, 0, new Intent("yourFirstAlarmReceiver"), PendingIntent.FLAG_UPDATE_CURRENT);

//schedule time for pending intent, and set the interval to day so that this event will repeat at the selected time every day
am.setRepeating(AlarmManager.RTC_WAKEUP, firstAlarm.getTimeInMillis(), firstPI);

//----------------------------------------------------

//create new calendar instance for your second alarm
Calendar endCalender = Calendar.getInstance();

//Set the time alarm of your second alarm
secondLullo.set(Calendar.HOUR_OF_DAY,10);
secondLullo.set(Calendar.MINUTE,56);
secondLullo.set(Calendar.SECOND, 0);

//create a pending intent to be 
PendingIntent secondPI= PendingIntent.getBroadcast(yourActivity.this, 0, new Intent("yourSecondAlarmReceiver"), PendingIntent.FLAG_UPDATE_CURRENT);

//schedule time for pending intent, and set the interval to day so that this event will repeat at the selected time every day
am.setRepeating(AlarmManager.RTC_WAKEUP, secondLullo.getTimeInMillis(), secondPI);

在Manifest.XML中注册闹钟:

<receiver android:name="firstAlarm" >
    <intent-filter>
        <action android:name="yourFirstAlarmReceiver" >
        </action>
    </intent-filter>
</receiver>

<receiver android:name="secondAlarm" >
    <intent-filter>
            <action android:name="yourSecondAlarmReceiver" >
            </action>
    </intent-filter>
</receiver>

现在您可以通过以下方式拨打闹钟：

第一个警报：

public class yourFirstAlarmReceiver extends BroadcastReceiver {

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

    //Do something when first alarm goes off

    }
}

第二个警报：

public class yourSecondAlarmReceiverextends BroadcastReceiver {

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

    //Do something when second alarm goes off

    }
}

应该能帮到你。

Answer 2

是的，当然上面的代码只会触发一个警报，因为您为两个警报设置了相同的 ID。

通过 pendingintent 中的 id 标识和区分警报。

不同的闹钟使用不同的id

更新代码：

pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 1234 ,intent,0);
alarmManager.setExact(AlarmManager.RTC_WAKEUP,firstLullo.getTimeInMillis(),pendingIntent);

pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 5678, intent,0);
alarmManager.setExact(AlarmManager.RTC_WAKEUP,secondLullo.getTimeInMillis(),pendingIntent);

AlarmManager 延迟触发或根本不触发

AlarmManager fires late or doesn't fire at all

android

alarmmanager