抓住滑动以关闭事件

Question

一旦服务完成（成功或失败），我正在使用 android 通知提醒用户，并且我想在该过程完成后删除本地文件。

我的问题是，如果发生故障 - 我想让用户有一个“重试”选项。如果他选择不重试并关闭通知，我想删除为处理目的而保存的本地文件（图像...）。

有没有办法捕捉通知的滑动关闭事件？

Answer 1

删除意图： DeleteIntent 是一个 PendingIntent 对象，可以与通知相关联，并在通知被删除时触发，ether by ：

• 用户特定操作
• 用户删除所有通知。

您可以将 Pending Intent 设置为广播接收器，然后执行您想要的任何操作。

  Intent intent = new Intent(this, MyBroadcastReceiver.class);
  PendingIntent pendingIntent = PendingIntent.getBroadcast(this.getApplicationContext(), 0, intent, 0);
  Builder builder = new Notification.Builder(this):
 ..... code for your notification
  builder.setDeleteIntent(pendingIntent);

MyBroadcastReceiver

public class MyBroadcastReceiver extends BroadcastReceiver {
      @Override
      public void onReceive(Context context, Intent intent) {
             .... code to handle cancel
         }

  }

Answer 2

一个完整的答案（感谢我先生的回答）：

1) 创建一个接收器来处理 swipe-to-dismiss 事件：

public class NotificationDismissedReceiver extends BroadcastReceiver {
  @Override
  public void onReceive(Context context, Intent intent) {
      int notificationId = intent.getExtras().getInt("com.my.app.notificationId");
      /* Your code to handle the event here */
  }
}

2) 在清单中添加一个条目：

<receiver
    android:name="com.my.app.receiver.NotificationDismissedReceiver"
    android:exported="false" >
</receiver>

3) 为待处理的 Intent 使用唯一的 id 创建待处理的 Intent（此处使用通知 ID），因为没有这个，相同的额外内容将被重复用于每个解除事件：

private PendingIntent createOnDismissedIntent(Context context, int notificationId) {
    Intent intent = new Intent(context, NotificationDismissedReceiver.class);
    intent.putExtra("com.my.app.notificationId", notificationId);

    PendingIntent pendingIntent =
           PendingIntent.getBroadcast(context.getApplicationContext(), 
                                      notificationId, intent, 0);
    return pendingIntent;
}

4) 构建您的通知：

Notification notification = new NotificationCompat.Builder(context)
              .setContentTitle("My App")
              .setContentText("hello world")
              .setWhen(notificationTime)
              .setDeleteIntent(createOnDismissedIntent(context, notificationId))
              .build();

NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(notificationId, notification);

Answer 3

另一个想法：

如果您正常创建通知，您还需要其中的一、二或三项操作。我创建了一个“NotifyManager”，它创建了我需要的所有通知并接收所有 Intent 调用。 所以我可以管理所有的动作，也可以在一个地方捕捉解雇事件。

public class NotifyPerformService extends IntentService {

@Inject NotificationManager notificationManager;

public NotifyPerformService() {
    super("NotifyService");
    ...//some Dagger stuff
}

@Override
public void onHandleIntent(Intent intent) {
    notificationManager.performNotifyCall(intent);
}

要创建 deleteIntent 使用这个（在 NotificationManager 中）：

private PendingIntent createOnDismissedIntent(Context context) {
    Intent          intent          = new Intent(context, NotifyPerformMailService.class).setAction("ACTION_NOTIFY_DELETED");
    PendingIntent   pendingIntent   = PendingIntent.getService(context, SOME_NOTIFY_DELETED_ID, intent, 0);

    return pendingIntent;
}

我用来设置删除 Intent 像这样（在 NotificationManager 中）：

private NotificationCompat.Builder setNotificationStandardValues(Context context, long when){
    String                          subText = "some string";
    NotificationCompat.Builder      builder = new NotificationCompat.Builder(context.getApplicationContext());


    builder
            .setLights(ContextUtils.getResourceColor(R.color.primary) , 1800, 3500) //Set the argb value that you would like the LED on the device to blink, as well as the rate
            .setAutoCancel(true)                                                    //Setting this flag will make it so the notification is automatically canceled when the user clicks it in the panel.
            .setWhen(when)                                                          //Set the time that the event occurred. Notifications in the panel are sorted by this time.
            .setVibrate(new long[]{1000, 1000})                                     //Set the vibration pattern to use.

            .setLargeIcon(BitmapFactory.decodeResource(context.getResources(), R.mipmap.ic_launcher))
            .setSmallIcon(R.drawable.ic_white_24dp)
            .setGroup(NOTIFY_GROUP)
            .setContentInfo(subText)
            .setDeleteIntent(createOnDismissedIntent(context))
    ;

    return builder;
}

最后在同一个 NotificationManager 中是 perform 函数：

public void performNotifyCall(Intent intent) {
    String  action  = intent.getAction();
    boolean success = false;

    if(action.equals(ACTION_DELETE)) {
        success = delete(...);
    }

    if(action.equals(ACTION_SHOW)) {
        success = showDetails(...);
    }

    if(action.equals("ACTION_NOTIFY_DELETED")) {
        success = true;
    }


    if(success == false){
        return;
    }

    //some cleaning stuff
}