在Android我怎么知道當前的通知id清除通知

Question

現在在 android 中，我將這段代碼放在一個活動中，以便在按下按鈕時顯示通知。

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);
                }
            }
    );

從通知管理器，我點擊它的任何通知，它會將我重定向到另一個活動（NotificationActivity）

現在我把這段代碼用來清除通知，但它只清除 id 為 0 的通知，所以我怎樣才能清除當前按下的通知

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

}

如果可能的話，我需要通過它的 id 清除通知。

Answer 1

您應該在通知中添加標記，然后通過提供正確的ID和正確的標記來清除通知。

如果您傳遞相同的ID，則不需要通知計數器，因為當通知看到相同的ID時，它會清除舊通知並添加新通知，除非您希望顯示該用戶收到多個通知。

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);
}

取消通知只需使用此方法：

//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

你需要在創建通知時添加這行代碼！

notification.flags |= Notification.FLAG_AUTO_CANCEL;

這將取消點擊通知。

進一步閱讀： 點擊通知后打開應用程序

**編輯，添加一個額外的內容以確定是否點擊了某個通知pIntent.putExtra("fromNotification", true);

Answer 3

您也可以使用通知渠道https://developer.android.com/develop/ui/views/notifications#ManageChannels