为什么我无法在 BroadcastReceiver 的 OnReceiver 中创建通知？

Question

我将创建通知并希望在 BroadcastReceiver 的 onReceiver 上显示它。但我做不到。为什么 ？ 我的课的代码是：

public class AlarmNotificationReceiver extends BroadcastReceiver{
//private Intent intent;
private NotificationManager notificationManager;
private Notification notification;
@Override
public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub

    long value1 = intent.getLongExtra("param1", 0);     
    String value2 = intent.getStringExtra("param2");
    Toast.makeText(context, "Hello! How r u ?", Toast.LENGTH_SHORT).show();
    addTwoMonthNotification();  

}

private void addTwoMonthNotification(){
    notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
    int icon = R.drawable.icon;
    CharSequence text = "Your amout is due on this date";
    CharSequence contentTitle = "Tax Calculator App";
    CharSequence contentText = "Your tax amount is due on the "+System.currentTimeMillis()+"";
    long when = System.currentTimeMillis();

    Intent intent = new Intent(this, NotificationViewer.class);
    PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, 0);
    notification = new Notification(icon,text,when);

    long[] vibrate = {0,100,200,300};
    notification.vibrate = vibrate;

    notification.ledARGB = Color.RED;
    notification.ledOffMS = 300;
    notification.ledOnMS = 300;

    notification.defaults |= Notification.DEFAULT_LIGHTS;
    //notification.flags |= Notification.FLAG_SHOW_LIGHTS;

    notification.setLatestEventInfo(this, contentTitle, contentText, contentIntent);
    notificationManager.notify(NotificationConstants.NOTIFICATION_ID, notification);
}

}

为它提供解决方案。 谢谢。

Answer 1

你见过这样的： startActivity() from BroadcastReceiver

您似乎没有使用Context.registerReceiver()，因此您必须将您的接收器静态添加到清单中，如果您还没有：

确保清单中有以下内容

<receiver android:name=".AlarmNotificationReceiver">
    <intent-filter>
            <action android:name="android.intent.action.PHONE_STATE" />
    </intent-filter>
</receiver>

在上面，PHONE_STATE 只是一个意图示例，可以与BroadcastReceiver 结合使用

更多参考：http://thinkandroid.wordpress.com/2010/02/02/custom-intents-and-broadcasting-with-receivers/

希望有帮助！