java - 单击通知后从后台打开应用程序后运行函数

Question

我对 Android 开发还很陌生。当应用程序在后台运行时，我能够收到弹出的通知。当我单击它时，它成功加载应用程序备份。但是，我想从页面加载警报，但仅当通过通知单击打开警报时才加载。

这是生成通知的代码。任何帮助将不胜感激。

private void getNotificationForPasswordChange() {
    NotificationManager mNotificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        CharSequence name = "Hello";// The user-visible name of the channel.
        int importance = NotificationManager.IMPORTANCE_HIGH;
        NotificationChannel mChannel = new NotificationChannel(CHANNEL_ID, name, importance);
        if (mNotificationManager != null)
            mNotificationManager.createNotificationChannel(mChannel);
    }

    Bitmap icon = BitmapFactory.decodeResource(getResources(),
            R.mipmap.ic_launcher);
    Intent i=new Intent(this, MainActivity.class);
    i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    i.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
    PendingIntent mainIntent = PendingIntent.getActivity(this, 0,
            i, PendingIntent.FLAG_UPDATE_CURRENT);

    Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID)
            .setContentTitle("Pronto Tracker")
            .setTicker("Pronto Tracker")
            .setContentText("Cannot connect to server. Location is not being updated.")
            .setSmallIcon(R.mipmap.ic_pronto_logo)
            .setLargeIcon(Bitmap.createScaledBitmap(icon, 128, 128, false))
            .setOngoing(true).setContentIntent(mainIntent).
                    build();
    mNotificationManager.notify(Constants.PASSWORD_CHANGE_NOTIFICATION_ID, notification);
}

Answer 1

您可以通过通知 PendingIntent 传递警报消息。在 PendingIntent .putExtra() 中添加要显示为警报的消息或值，并在 PendingIntent 中指定要以对话框或其他形式显示警报的 Activity 。

 Intent intent = new Intent(Application.getAppContext(), MainActivity.class);
 intent.putExtra("is_notification", true);
 intent.putExtra("alert_message", "Hello World!");
 intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
 PendingIntent lowIntent = PendingIntent.getActivity(mContext, 100, intent, PendingIntent.FLAG_CANCEL_CURRENT);

之后将 PendingIntent 添加到您的通知中。您需要做的第二件事是当用户点击通知时从 Intent 获取数据。在您的 MainActivity 中添加以下代码以从 Intent 获取数据:-

if (getIntent() != null) {
   String message = getIntent().getStringExtra("alert_message");
   boolean isNotification = getIntent().getBooleanExtra("is_notification", false);

    if(is_notification){
       // show alert
      }
    }