Java Code Examples for androidx.core.app.TaskStackBuilder#startActivities()

@Override
public void onClick(View v) {
    // This ID represents the Home or Up button. In the case of this
    // activity, the Up button is shown. Use NavUtils to allow users
    // to navigate up one level in the application structure. For
    // more details, see the Navigation pattern on Android Design:
    //
    // http://developer.android.com/design/patterns/navigation.html#up-vs-back
    //
    final Intent listIntent = new Intent(this, PostItemListActivity.class);
    if (NavUtils.shouldUpRecreateTask(this, listIntent)) {
        final TaskStackBuilder taskStack = TaskStackBuilder.create(this);
        taskStack.addNextIntent(listIntent);
        taskStack.startActivities();
    } else {
        NavUtils.navigateUpTo(this, listIntent);
    }
}
 

/**
 * This method is called whenever the user chooses to navigate Up within your application's
 * activity hierarchy from the action bar.
 *
 * <p>If a parent was specified in the manifest for this activity or an activity-alias to it,
 * default Up navigation will be handled automatically. See
 * {@link #getSupportParentActivityIntent()} for how to specify the parent. If any activity
 * along the parent chain requires extra Intent arguments, the Activity subclass
 * should override the method {@link #onPrepareSupportNavigateUpTaskStack(androidx.core.app.TaskStackBuilder)}
 * to supply those arguments.</p>
 *
 * <p>See <a href="{@docRoot}guide/topics/fundamentals/tasks-and-back-stack.html">Tasks and
 * Back Stack</a> from the developer guide and
 * <a href="{@docRoot}design/patterns/navigation.html">Navigation</a> from the design guide
 * for more information about navigating within your app.</p>
 *
 * <p>See the {@link androidx.core.app.TaskStackBuilder} class and the Activity methods
 * {@link #getSupportParentActivityIntent()}, {@link #supportShouldUpRecreateTask(android.content.Intent)}, and
 * {@link #supportNavigateUpTo(android.content.Intent)} for help implementing custom Up navigation.</p>
 *
 * @return true if Up navigation completed successfully and this Activity was finished,
 *         false otherwise.
 */
public boolean onSupportNavigateUp() {
    Intent upIntent = getSupportParentActivityIntent();

    if (upIntent != null) {
        if (supportShouldUpRecreateTask(upIntent)) {
            TaskStackBuilder b = TaskStackBuilder.create(this);
            onCreateSupportNavigateUpTaskStack(b);
            onPrepareSupportNavigateUpTaskStack(b);
            b.startActivities();

            try {
                ActivityCompat.finishAffinity(this);
            } catch (IllegalStateException e) {
                // This can only happen on 4.1+, when we don't have a parent or a result set.
                // In that case we should just finish().
                finish();
            }
        } else {
            // This activity is part of the application's task, so simply
            // navigate up to the hierarchical parent activity.
            supportNavigateUpTo(upIntent);
        }
        return true;
    }
    return false;
}
 

/**
 * Enables back navigation for activities that are launched from the NavBar. See
 * {@code AndroidManifest.xml} to find out the parent activity names for each activity.
 * @param intent
 */
private void createBackStack(Intent intent) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
        TaskStackBuilder builder = TaskStackBuilder.create(this);
        builder.addNextIntentWithParentStack(intent);
        builder.startActivities();
    } else {
        startActivity(intent);
        finish();
    }
}
 

/**
 * This method is called whenever the user chooses to navigate Up within your application's
 * activity hierarchy from the action bar.
 *
 * <p>If a parent was specified in the manifest for this activity or an activity-alias to it,
 * default Up navigation will be handled automatically. See
 * {@link #getSupportParentActivityIntent()} for how to specify the parent. If any activity
 * along the parent chain requires extra Intent arguments, the Activity subclass
 * should override the method {@link #onPrepareSupportNavigateUpTaskStack(androidx.core.app.TaskStackBuilder)}
 * to supply those arguments.</p>
 *
 * <p>See <a href="{@docRoot}guide/topics/fundamentals/tasks-and-back-stack.html">Tasks and
 * Back Stack</a> from the developer guide and
 * <a href="{@docRoot}design/patterns/navigation.html">Navigation</a> from the design guide
 * for more information about navigating within your app.</p>
 *
 * <p>See the {@link androidx.core.app.TaskStackBuilder} class and the Activity methods
 * {@link #getSupportParentActivityIntent()}, {@link #supportShouldUpRecreateTask(android.content.Intent)}, and
 * {@link #supportNavigateUpTo(android.content.Intent)} for help implementing custom Up navigation.</p>
 *
 * @return true if Up navigation completed successfully and this Activity was finished,
 *         false otherwise.
 */
public boolean onSupportNavigateUp() {
    Intent upIntent = getSupportParentActivityIntent();

    if (upIntent != null) {
        if (supportShouldUpRecreateTask(upIntent)) {
            TaskStackBuilder b = TaskStackBuilder.create(this);
            onCreateSupportNavigateUpTaskStack(b);
            onPrepareSupportNavigateUpTaskStack(b);
            b.startActivities();

            try {
                ActivityCompat.finishAffinity(this);
            } catch (IllegalStateException e) {
                // This can only happen on 4.1+, when we don't have a parent or a result set.
                // In that case we should just finish().
                finish();
            }
        } else {
            // This activity is part of the application's task, so simply
            // navigate up to the hierarchical parent activity.
            supportNavigateUpTo(upIntent);
        }
        return true;
    }
    return false;
}