Android

Question

编辑：已解决！曾经想设置从特定日期开始的某个时间点的通知（当 activity 启动或按下按钮时？）阅读更多内容以了解如何：

 //Set a notification in 7 days
                Calendar sevendayalarm = Calendar.getInstance();

                sevendayalarm.add(Calendar.DATE, 7);

                Intent intent = new Intent(this, Receiver.class);
                PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 001, intent, 0);

                AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
                am.set(AlarmManager.RTC_WAKEUP, sevendayalarm.getTimeInMillis(), pendingIntent);

这是接收器的代码class

public class Receiver extends Service {

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        Intent intent = new Intent(this, Test.class);
        long[] pattern = {0, 300, 0};
        PendingIntent pi = PendingIntent.getActivity(this, 01234, intent, 0);
        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)
            .setSmallIcon(R.drawable.depressiontest)
            .setContentTitle("Take Questionnaire")
            .setContentText("Take questionnaire for Duke Mood Study.")
            .setVibrate(pattern)
            .setAutoCancel(true);

        mBuilder.setContentIntent(pi);
        mBuilder.setDefaults(Notification.DEFAULT_SOUND);
        mBuilder.setAutoCancel(true);
        NotificationManager mNotificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
        mNotificationManager.notify(01234, mBuilder.build());
    }
}

并且不要忘记在清单中添加以下权限！

<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
 <service android:name=".Receiver2" android:enabled="true">
        <intent-filter> <action android:name="NOTIFICATION_SERVICE" /></intent-filter>
    </service>

Answer 1

不要忘记授予以下清单权限

<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />

你的广播接收器注册应该是这样的

   <receiver android:name=".AlarmReceiver" >
         <intent-filter>
           <action android:name="NOTIFICATION_SERVICE" />
         </intent-filter>
     </receiver>

Answer 2

需要注意的重要事项：使用 Intent-Filter 注册广播接收器时，您需要添加 exported 属性并将其设置为 false。像这样：

<service

        android:name=".utility.AlarmReceiver" android:exported="false">
        <intent-filter>
            <action android:name="NOTIFICATION_SERVICE" />
        </intent-filter>

    </service>

其他应用程序的其他组件将能够调用您的服务或与之交互。

来自Google的完整解释：

android:exported

   Specifies whether or not components of other applications
   can invoke the service or interact with it —
   "true" if they can, and "false" if not.

When the value is "false", only components of the same application or    
applications with the same user ID can start the service or bind to it.

The default value depends on whether the service contains intent filters.      
The absence of any filters means that it can be invoked only by specifying 
its exact class name. This implies that the service is intended only for 
application-internal use (since others would not know the class name). So 
in this case, the default value is "false". On the other hand, the presence 
of at least one filter implies that the service is intended for external 
use, so the default value is "true".

Android - 如何将通知设置为将来的特定日期？

Android - How to set a notification to a specific date in the future?

date

calendar

notifications

alarmmanager