AlarmManager延遲觸發或根本不觸發

Question

大家好，我正在嘗試學習如何在Android中使用AlarmManager和BroadcastReceiver 。 我在使用AlarmManager遇到一些問題：我在1分鍾的距離處設置了兩個警報，但是只有一個會觸發，並且延遲了幾分鍾（我想這是無法預測的）。

這是我的主要活動（我通過點擊按鈕設置“鬧鍾”）

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));
            }
        });
    }
}

我的接收器僅顯示一個Toast，並使手機振動。 Constants.EXTENDED_DATA_STATUS是Constants類中的一個字符串，它已添加到Android清單中我的Reveiver的intent-filter中。

我想念什么？ 我用setExact()搜索了很多，只發現我必須使用setExact()但沒有運氣。

提前致謝

Answer 1

之所以只有一次開火，是因為您總是 取消第一個

從文檔中：如果已經為同一IntentSender安排了警報，則該先前的警報將首先被取消。

要解決此問題，請對兩個警報使用不同的PendingIntents 。

-要讓您的接收器多次觸發，請在onReceive()重新安排它的時間

示例： 僅當您要兩個接收器彼此分開時！

//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中注冊警報：

<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>

現在，您可以通過以下方式撥打警報：

第一個警報：

public class yourFirstAlarmReceiver extends BroadcastReceiver {

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

    //Do something when first alarm goes off

    }
}

第二警報：

public class yourSecondAlarmReceiverextends BroadcastReceiver {

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

    //Do something when second alarm goes off

    }
}

應該可以幫助你。

Answer 2

是的，上面的代碼當然只會觸發一個警報，因為您為兩個警報設置了相同的ID。

警報通過掛起意圖中的ID進行標識和區分。

對不同的警報使用不同的ID

更新代碼：

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);