在 Android 中，我如何知道当前的通知 ID 以清除通知

Question

现在在 android 中，我将此代码放在一个活动中，以便在按下按钮时显示通知。

static int notificationCount = 0;

然后

 btnNotification.setOnClickListener(
            new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    Intent notificationIntent = new Intent(AlertsActivity.this,NotificationActivitty.class);
                    PendingIntent pIntent = PendingIntent.getActivity(AlertsActivity.this,notificationCount,notificationIntent,Intent.FLAG_ACTIVITY_NEW_TASK);

                    // Construct the notification
                    Notification.Builder nBuilder = new Notification.Builder(AlertsActivity.this);
                    nBuilder.setContentTitle("You Have a notification!");
                    nBuilder.setContentText("See Your Notification");
                    nBuilder.setSmallIcon(android.R.drawable.btn_star);
                    nBuilder.setContentIntent(pIntent);
                   nBuilder.addAction(android.R.drawable.stat_notify_call_mute, "go to", pIntent); // from icecream sandwatch - required api 16

                    // Build the notification
                    Notification noti = nBuilder.build(); // required api 16

                    //Send it to manager
                        NotificationManager manager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
                        manager.notify(notificationCount++,noti);
                }
            }
    );

来自通知管理器，我点击它的任何通知，都会将我重定向到另一个活动（NotificationActivity）

现在我把这段代码用来清除通知，但它只清除 id 为 0 的通知，所以我怎样才能清除当前按下的通知

public class NotificationActivitty  extends Activity{

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_notification);

    NotificationManager manager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
    manager.cancel(0);
    // manager.cancelAll(); // Cancel all notifications for this app. from manager

}

如果可能的话，我需要通过它的 id 清除通知。

Answer 1

您应该在通知中添加标签，然后通过提供正确的 id 和正确的标签来清除通知。

如果您传递相同的 id，则不需要通知计数器，因为当通知看到相同的 id 时，它会清除旧通知并放入新通知，除非您想显示该用户收到了多个通知。

private static final String TAG = "YourNotification";
private static final int NOTIFICATION_ID = 101;
private Notification notification;
public NotificationManager notificationManager;

//you can create notification with it's own id and tag, text, etc by passing 
//these variables into the method (int id, String tag, ... etc)

public void createNotification()
{
    notification = new Notification.Builder(context)
                       .setContentTitle("Content title")
                       .setContentText("Content text")
                       .setSmallIcon(R.drawable.your_small_icon)
                       .setLargeIcon(bitmapYourLargeIcon)
                       .setContentIntent(pendingIntent)
                       .addAction(R.drawable.icon, pendingIntentAction)
                       .build();
    notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    notification.flags |= Notification.FLAG_AUTO_CANCEL;
    notificationManager.notify(TAG, NOTIFICATION_ID, notification);
}

要取消通知，只需使用以下方法：

//clears your notification in 100% cases

public void cancelNotification(int id, String tag)
{
  //you can get notificationManager like this:
  //notificationManage r= (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    notificationManager.cancel(tag, id);
}

Answer 2

您需要在创建通知时添加这行代码！！！

notification.flags |= Notification.FLAG_AUTO_CANCEL;

这将取消点击通知。

延伸阅读：Open application after clicking on Notification

** 编辑，添加额外内容以确定是否点击了某个通知 pIntent.putExtra("fromNotification", true);