睡眠期間未接收到鬧鈴

Question

睡眠期間未收到鬧鈴。

我有一個鬧鐘設置爲午夜來更新我的視圖，一旦鬧鐘響起。警報在設備醒來時工作 - 已通過將時間更改爲午夜等來測試此功能。但是，在我的手機上進行測試時，它在睡眠期間不起作用。我在午夜前幾個小時讓我的手機進入睡眠狀態，然後在早上8點左右查看應用程序。然而，該視圖沒有更新，所以我認爲沒有收到警報。

我在模擬器上嘗試了以下方法 - 在午夜之前將設備置於睡眠狀態，然後在午夜後喚醒設備。不過，我可以看到正在更新的數據，並且在我的日誌中收到了警報。

有關我在下面的代碼中做了什麼錯誤的任何想法？

活動：

@Override 
    protected void onResume(){ 
     super.onResume(); 
     updateReceiver = new AlarmReceiver(new AlarmReceiverCallback(){ 
      @Override 
      public void onAlarmReceived(Intent intent) { 
       //update view code 
      } 
     }); 
     IntentFilter updateIntentFilter = new IntentFilter("alarm"); 
     registerReceiver(updateReceiver,updateIntentFilter); 
    } 

    @Override 
    protected void onPause(){ 
     super.onPause(); 
     if(this.updateReceiver!=null){ 
      unregisterReceiver(updateReceiver); 
     } 
    } 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     //set up view 

     setRecurringDailyAlarm(); 
    } 

    private void setRecurringDailyAlarm(){ 

     Calendar updateTime = Calendar.getInstance(); 
     updateTime.setTimeInMillis(System.currentTimeMillis()); 

     //daily alarm at midnight 
     updateTime.set(Calendar.HOUR_OF_DAY,00); 
     updateTime.set(Calendar.MINUTE,00); 
     updateTime.set(Calendar.SECOND,00); 
     Log.d(TAG, "Alarm time is: " + updateTime.getTime()); 
     Intent myIntent = new Intent(); 
     myIntent.setAction("alarm"); 
     PendingIntent recurringAlarm = PendingIntent.getBroadcast(MainActivity.this, ALARM_ID, myIntent, 
       PendingIntent.FLAG_CANCEL_CURRENT); 
     AlarmManager alarms = (AlarmManager)getSystemService(Context.ALARM_SERVICE); 

     alarms.setRepeating(AlarmManager.RTC_WAKEUP, updateTime.getTimeInMillis(), 
       AlarmManager.INTERVAL_DAY, recurringAlarm); 

    } 

清單：

 <category android:name="android.intent.category.LAUNCHER" /> 
    </intent-filter> 
</activity> 

<receiver android:name=".receiver.BootUpReceiver" android:enabled="true" android:exported="false" 
    android:permission="android.premission.RECEIVE_BOOT_COMPLETED"> 
    <intent-filter> 
    <action android:name="android.intent.action.BOOT_COMPLETED" /> 
    <category android:name="android.intent.category.DEFAULT" /> 
    </intent-filter> 
</receiver> 
<receiver android:name="com.test.receiver.RestartReceiver" android:enabled="true" android:process=":remote"></receiver> 

== EDIT

如果我改變我的代碼Intent myIntent = new Intent(this, AlarmReceiver.class);

這將在我的應用程序拋出一個錯誤，因爲我已經實現了報警接收機如下。我使用的是「回調」來更新我的UI

報警接收機類：

interface AlarmReceiverCallback{ 
    public void onAlarmReceived(Intent intent); 
} 

public class AlarmReceiver extends BroadcastReceiver{ 

    private AlarmReceiverCallback callback; 

    public AlarmReceiver(AlarmReceiverCallback callback){ 
     this.callback = callback; 
    } 
    @Override 
    public void onReceive(Context context, Intent intent) { 
     callback.onAlarmReceived(intent); 
    } 
} 

錯誤日誌：

01-25 16:05:38.655: D/dalvikvm(810): newInstance failed: no <init>() 
01-25 16:05:38.686: D/AndroidRuntime(810): Shutting down VM 
01-25 16:05:38.686: W/dalvikvm(810): threadid=1: thread exiting with uncaught exception (group=0x40a70930) 
01-25 16:05:38.785: E/AndroidRuntime(810): FATAL EXCEPTION: main 
01-25 16:05:38.785: E/AndroidRuntime(810): java.lang.RuntimeException: Unable to instantiate receiver com.test.receiver.AlarmReceiver: java.lang.InstantiationException: can't instantiate class com.test.receiver.AlarmReceiver; no empty constructor 
01-25 16:05:38.785: E/AndroidRuntime(810): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2357) 
01-25 16:05:38.785: E/AndroidRuntime(810): at android.app.ActivityThread.access$1500(ActivityThread.java:141) 
01-25 16:05:38.785: E/AndroidRuntime(810): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1310) 
01-25 16:05:38.785: E/AndroidRuntime(810): at android.os.Handler.dispatchMessage(Handler.java:99) 
01-25 16:05:38.785: E/AndroidRuntime(810): at android.os.Looper.loop(Looper.java:137) 
01-25 16:05:38.785: E/AndroidRuntime(810): at android.app.ActivityThread.main(ActivityThread.java:5039) 
01-25 16:05:38.785: E/AndroidRuntime(810): at java.lang.reflect.Method.invokeNative(Native Method) 
01-25 16:05:38.785: E/AndroidRuntime(810): at java.lang.reflect.Method.invoke(Method.java:511) 
01-25 16:05:38.785: E/AndroidRuntime(810): at 

Answer 1

使用捕捉警報在您的清單，您應該註冊接收器以及您的其他接收器。然後創建您的意圖啓動AlarmReceiver。

當您在代碼中執行此操作時，它在中未註冊，因此如果警報觸發時您的活動不在前臺，則無法捕捉它。

清單：

<receiver android:name="com.test.receiver.AlarmReceiver" 
/> 

代碼：

private void setRecurringDailyAlarm(){ 

    Calendar updateTime = Calendar.getInstance(); 
    updateTime.setTimeInMillis(System.currentTimeMillis()); 

    //daily alarm at midnight 
    updateTime.set(Calendar.HOUR_OF_DAY,00); 
    updateTime.set(Calendar.MINUTE,00); 
    updateTime.set(Calendar.SECOND,00); 
    Log.d(TAG, "Alarm time is: " + updateTime.getTime()); 

    Intent myIntent = new Intent(this, AlarmReceiver.class); 
    PendingIntent recurringAlarm = PendingIntent.getBroadcast(MainActivity.this, ALARM_ID, myIntent, PendingIntent.FLAG_CANCEL_CURRENT); 
    AlarmManager alarms = (AlarmManager)getSystemService(Context.ALARM_SERVICE); 

    alarms.setRepeating(AlarmManager.RTC_WAKEUP, updateTime.getTimeInMillis(), 
      AlarmManager.INTERVAL_DAY, recurringAlarm); 
}