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 。 我在使用AlarmManager遇到一些问题：我在1分钟的距离处设置了两个警报，但是只有一个会触发，并且延迟了几分钟（我想这是无法预测的）。

这是我的主要活动（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));
            }
        });
    }
}

我的接收器仅显示一个Toast，并使手机振动。 Constants.EXTENDED_DATA_STATUS是Constants类中的一个字符串，它已添加到Android清单中我的Reveiver的intent-filter中。

我想念什么？ 我用setExact()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

之所以只有一次开火，是因为您总是 取消第一个

从文档中：如果已经为同一IntentSender安排了警报，则该先前的警报将首先被取消。

要解决此问题，请对两个警报使用不同的PendingIntents 。

-要让您的接收器多次触发，请在onReceive()重新安排它的时间

示例： 仅当您要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中注册警报：

<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警报：

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

    }
}

第二警报：

public class yourSecondAlarmReceiverextends BroadcastReceiver {

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

    //Do something when second alarm goes off

    }
}

应该可以帮助你。

Answer 2

是的，上面的代码当然只会触发一个警报，因为您为两个警报设置了相同的ID。

警报通过挂起意图中的ID进行标识和区分。

对不同的警报使用不同的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);