Why do we use the TaskStackBuilder?

问题:

Why do we use the TaskStackBuilder when creating a notification? I do not get the logic behind it.

Can someone please explain.

public void showText(final String text){
    Intent intent = new Intent (this, MainActivity.class);
    TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
    stackBuilder.addParentStack(MainActivity.class);
    stackBuilder.addNextIntent(intent);
    PendingIntent pendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
    Notification notification = new Notification.Builder(this)
            .setSmallIcon(R.mipmap.ic_launcher)
            .setContentTitle(getString(R.string.app_name))
            .setAutoCancel(true)
            .setPriority(Notification.PRIORITY_MAX)
            .setDefaults(Notification.DEFAULT_VIBRATE)
            .setContentIntent(pendingIntent)
            .setContentText(text)
            .build();
    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    notificationManager.notify(NOTIFICACTION_ID, notification);
}

回答1:

Suppose you have an email sending app and you have two activities in it. One is MainActivity which has the email list and other one is for displaying an email (EmailViewActivity). So now when you receive a new email you display a notification on statusbar. And now you want to view that email when an user clicks on it and also after displaying the email if the user clicks back button you want to show the email list activity(MainActivity). For this scenario we can use TaskStackBuilder. See below example:

public void showEmail(final String text){

        Intent intent = new Intent (this, MainActivity.class);
        TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
        stackBuilder.addParentStack(MainActivity.class);
        stackBuilder.addNextIntent(intent);
        Intent intentEmailView = new Intent (this, EmailViewActivity.class);
        intentEmailView.putExtra("EmailId","you can Pass emailId here");
        stackBuilder.addNextIntent(intentEmailView);
        PendingIntent pendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
        Notification notification = new Notification.Builder(this)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle(getString(R.string.app_name))
                .setAutoCancel(true)
                .setPriority(Notification.PRIORITY_MAX)
                .setDefaults(Notification.DEFAULT_VIBRATE)
                .setContentIntent(pendingIntent)
                .setContentText(text)
                .build();
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(NOTIFICACTION_ID, notification);
    }

Hope you can understand.

Follow below urls for more details: http://developer.android.com/reference/android/support/v4/app/TaskStackBuilder.html http://developer.android.com/guide/components/tasks-and-back-stack.html http://www.programcreek.com/java-api-examples/index.php?api=android.app.TaskStackBuilder

回答2:

We use a TaskStackBuilder to make sure that the back button will play nicely when the activity gets started. The TaskStackBuilder allows you to access the history of activities used by the back button. Basically, we use it when we want the user to navigate to another activity after pressing back button.

回答3:

The other answers explained it nicely: you use a pending intent to send a user into a detail activity, then you want them to use the back button to go back to the main activity. An alternative way to set this is

Intent detailIntentForToday = new Intent(context, DetailActivity.class);
TaskStackBuilder taskStackBuilder = TaskStackBuilder.create(context);
taskStackBuilder.addNextIntentWithParentStack(detailIntentForToday);
PendingIntent resultPendingIntent = taskStackBuilder
    .getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
resultPendingIntent.send();

For this, you also need to set

android:parentActivityName=".MainActivity"

for the DetailActivity in AndroidManifest.xml.