AndroidX Preferences and Navigation - android-preferences

Are there any examples of using the Jetpack / androidx preference library alongside the navigation component / Single activity? All the examples I'm seeing ( e.g. Google's example ) are using supportFragmentManager and replacing the content of a FrameLayout.
Navigating to the PreferenceFragmentCompat() with the navigation component almost works, in that it shows the Preferences page, but it is missing all of the toolbar/navigation icons. It's just implanted over the previous fragment, so to exit it, you need to hit the hardware back button.
Looks like this already has an issue filed with Google's issue tracker here

I just ran into the same problem and this is how I implemented it. Before I get into the code I want to give a quick summary. I have a single activity and two fragments. One of the fragments is the main fragment that is the home screen for the application and the other is the fragment that shows the settings. I end up not using SupportFragmentManager (which Google shows in their settings guide) as I was running into the same problem where the view would just appear on top of the previous view. So I just navigate to the settings fragment in the same way you would navigate to any other fragment in the single activity architecture using findNavController().navigate(...).
Firstly you will need to add the appropriate dependencies to your app build.gradle:
dependencies {
// androidx Preferences
implementation "androidx.preference:preference-ktx:1.1.0"
// androidx Navigation
implementation 'androidx.navigation:navigation-fragment-ktx:2.2.0'
implementation 'androidx.navigation:navigation-ui-ktx:2.2.0'
Then I set up my MainActivity.kt for Navigation as described in Google's navigation guide
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
this, this.findNavController(
// Allows the up arrow to navigate back to the navigation host fragment.
override fun onSupportNavigateUp(): Boolean {
return Navigation.findNavController(this,
After that, set up a fragment that will be hosted by MainActivity.kt. This fragment is what will appear when you open up your app. I call mine MainFragment.kt. See Google's menu guide for help on creating the dropdown menu that is inflated when the three dot icon in the toolbar is clicked.
class MainFragment : Fragment() {
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Show the three dot icon in the top right had corner of the toolbar
return inflater.inflate(R.layout.fragment_main, container, false)
override fun onOptionsItemSelected(item: MenuItem): Boolean {
return when (item.itemId) {
// Navigate to the settings fragment when the options menu item is selected -> {
else -> super.onOptionsItemSelected(item)
// Inflates menu.xml when the three dot icon is clicked
override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
inflater.inflate(, menu)
Finally, the settings fragment is pretty easy to implement. Reference Google's settings guide (see link above) on how to set that up.
class MySettingsFragment : PreferenceFragmentCompat() {
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
setPreferencesFromResource(R.xml.preferences, rootKey)
Also, don't forget to hook up your fragments in nav_graph.xml. Reference Google's navigation guide linked above for examples of that.
Hope this helps!


WPF native windows 10 toasts

Using .NET WPF and Windows 10, is there a way to push a local toast notification onto the action center using c#? I've only seen people making custom dialogs for that but there must be a way to do it through the os.
You can use a NotifyIcon from System.Windows.Forms namespace like this:
class Test
private readonly NotifyIcon _notifyIcon;
public Test()
_notifyIcon = new NotifyIcon();
// Extracts your app's icon and uses it as notify icon
_notifyIcon.Icon = Icon.ExtractAssociatedIcon(Assembly.GetExecutingAssembly().Location);
// Hides the icon when the notification is closed
_notifyIcon.BalloonTipClosed += (s, e) => _notifyIcon.Visible = false;
public void ShowNotification()
_notifyIcon.Visible = true;
// Shows a notification with specified message and title
_notifyIcon.ShowBalloonTip(3000, "Title", "Message", ToolTipIcon.Info);
This should work since .NET Framework 1.1. Refer to this MSDN page for parameters of ShowBalloonTip.
As I found out, the first parameter of ShowBalloonTip (in my example that would be 3000 milliseconds) is generously ignored. Comments are appreciated ;)
I know this is an old post but I thought this might help someone that stumbles on this as I did when attempting to get Toast Notifications to work on Win 10.
This seems to be good outline to follow -
Send a local toast notification from desktop C# apps
I used that link along with this great blog post- Pop a Toast Notification in WPF using Win 10 APIs
to get my WPF app working on Win10. This is a much better solution vs the "old school" notify icon because you can add buttons to complete specific actions within your toasts even after the notification has entered the action center.
Note- the first link mentions "If you are using WiX" but it's really a requirement. You must create and install your Wix setup project before you Toasts will work. As the appUserModelId for your app needs to be registered first. The second link does not mention this unless you read my comments within it.
TIP- Once your app is installed you can verify the AppUserModelId by running this command on the run line shell:appsfolder . Make sure you are in the details view, next click View , Choose Details and ensure AppUserModeId is checked. Compare your AppUserModelId against other installed apps.
Here's a snipit of code that I used. One thing two note here, I did not install the "Notifications library" mentioned in step 7 of the first link because I prefer to use the raw XML.
private const String APP_ID = "YourCompanyName.YourAppName";
public static void CreateToast()
XmlDocument toastXml = ToastNotificationManager.GetTemplateContent(
// Fill in the text elements
XmlNodeList stringElements = toastXml.GetElementsByTagName("text");
stringElements[0].AppendChild(toastXml.CreateTextNode("This is my title!!!!!!!!!!"));
stringElements[1].AppendChild(toastXml.CreateTextNode("This is my message!!!!!!!!!!!!"));
// Specify the absolute path to an image
string filePath = Environment.GetFolderPath(Environment.SpecialFolder.ProgramFilesX86) + #"\Your Path To File\Your Image Name.png";
XmlNodeList imageElements = toastXml.GetElementsByTagName("image");
imageElements[0].Attributes.GetNamedItem("src").NodeValue = filePath;
// Change default audio if desired - ref -
XmlElement audio = toastXml.CreateElement("audio");
//audio.SetAttribute("src", "ms-winsoundevent:Notification.Reminder");
//audio.SetAttribute("src", "ms-winsoundevent:Notification.IM");
//audio.SetAttribute("src", "ms-winsoundevent:Notification.Mail"); // sounds like default
//audio.SetAttribute("src", "ms-winsoundevent:Notification.Looping.Call7");
audio.SetAttribute("src", "ms-winsoundevent:Notification.Looping.Call2");
//audio.SetAttribute("loop", "false");
// Add the audio element
XmlElement actions = toastXml.CreateElement("actions");
// Create a simple button to display on the toast
XmlElement action = toastXml.CreateElement("action");
action.SetAttribute("content", "Show details");
action.SetAttribute("arguments", "viewdetails");
// Create the toast
ToastNotification toast = new ToastNotification(toastXml);
// Show the toast. Be sure to specify the AppUserModelId
// on your application's shortcut!
This seems to be working fine on windows 10
you will need to add these nugets
Install-Package WindowsAPICodePack-Core
Install-Package WindowsAPICodePack-Shell
Add reference to:
C:\Program Files (x86)\Windows Kits\8.1\References\CommonConfiguration\Neutral\Windows.winmd
C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETCore\v4.5\System.Runtime.WindowsRuntime.dll
And use the following code:
XmlDocument toastXml = ToastNotificationManager.GetTemplateContent(ToastTemplateType.ToastImageAndText04);
// Fill in the text elements
XmlNodeList stringElements = toastXml.GetElementsByTagName("text");
for (int i = 0; i < stringElements.Length; i++)
stringElements[i].AppendChild(toastXml.CreateTextNode("Line " + i));
// Specify the absolute path to an image
string imagePath = "file:///" + Path.GetFullPath("toastImageAndText.png");
XmlNodeList imageElements = toastXml.GetElementsByTagName("image");
ToastNotification toast = new ToastNotification(toastXml);
ToastNotificationManager.CreateToastNotifier("Toast Sample").Show(toast);
The original code can be found here:
I managed to gain access to the working API for windows 8 and 10 by referencing
C:\Program Files (x86)\Windows Kits\8.0\References\CommonConfiguration\Neutral
This exposes Windows.UI.Notifications.
You can have a look at this post for creating a COM server that is needed in order to have notifications persisted in the AC with Win32 apps
A working sample can be found at

ADF Jdeveloper Refresh Parent Form on Popup close

I want to refresh(update few fields) on my parent form when OK button is clicked on Poup Dialog. But it does not refresh the fields. I have also set partialTriggers for the fields with Popup Id.
My Jdeveloper version is
Umer Farooq
All you need is linking the OK button action (or action listener) property with a call through an EL to a method provided on a managed bean. Then, in it you should refresh either each component or just the form/parent component keeping all of them(by registering it's bind into a partial target of the ADF context). The method should be similar to this example:
public String refresh() {
return null;
private RichPanelFormLayout installDisable; //this should be the binding to the JSF form
public void setInstallDisable(RichPanelFormLayout installDisable) {
this.installDisable = installDisable;
public RichPanelFormLayout getInstallDisable() {
return installDisable;
I would need to see what you implemented in your code in order to provide you the "best" solution overall - as theres multiple ways to implement a dialog in a popup. However, here's a couple options depending on how your Popup Dialog is programmed:
Dialog Listener - use this if you use the built-in buttons of a dialog box. You'll need a managed bean for your jspx/jsf page. Create a Dialog Listener on your managed bean that is on your Dialog box. See below for a example of a dialog listener.
public void myDialogListener(DialogEvent dialogEvent) {
if (dialogEvent.getOutcome().equals(DialogEvent.Outcome.yes)) {
// do something...
} else if (dialogEvent.getOutcome().equals( {
//do something...
Return Listener - if you're running a task flow as a popup dialog, on your button, then add a ReturnListener to your page's managed bean. This fires whenever a your popup/dialog is closing.
public void myReturnListener(ReturnEvent returnEvent) {
//do something...
Otherwise, i'd add a an ActionListener to your manual button as Endrik suggests.
Now for refreshing your components, use this method in your managed bean, i use it all the time in my projects:
public void refreshComponent(UIComponent comp) {
RequestContext rContext = RequestContext.getCurrentInstance();
To use it, you need to bind your Form's UI components to a managed bean. Then feed in the UI Component's bean property into the method.
For example, below will refresh a Rich Output Text that i have bound to a managed bean:
private RichOutputText myOutputText;
public void refreshMyStuff() {
Have a good one.

IOS 6 - Auto Rotate MPMovieplayer

So, i'm fix interface Iphone is portrait and i wanna show landscapte when i playing video(using MPMoviePlayerController), i have read in ios6 sdk,ShouldAutorotateToInterfaceOrientation is deprecated. How to rotate only this player view? I can only rotate whole app, but don't want to do this.
i tryed with
return [[self.viewControllers lastObject] shouldAutorotate];
return [[self.viewControllers lastObject] supportedInterfaceOrientations];
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
return [[self.viewControllers lastObject] preferredInterfaceOrientationForPresentation];
in this link or link but video still doesn't change.. Can you help me
First of all, in your app settings, do you allow any other orientation besides portrait?
Second, is your view controller embedded in an UINavigationController/UITabBarController/UISplitViewController?
The code you posted is supposed to work as a category or by subclassing an UINavigationController. If your container is not a UINavigationController, it won't work.(at least not for UITabBarController).
Can you also post the code where you enable to rotation for your view controller?
Also, it could be helpful to also show the whole code for your category/subclass.

Selenium WebDriver page object

Quick question about page objects in selenium webdriver. our site is very dynamic with lots of ajax and various authentication states. It is tough to figure out how to define each page object BUT lets say I have figured that out and defined several page objects that represent our site.
How do you handle crossing from page to page. So I get a page object for my home page and one for my account page and one for my results page. Then I need to write a test that traverses all my pages to simulate a user performing multiple actions.
How do you say give me a HomePage object to create a new use -> then get a account page object to go perform some user actions - then get a result page object to verify those actions all from a single script.
How are people doing this?
When you're simulating having the user enter a new URL into the URL bar of the browser, then it's the responsibility of the test class to create the page object it needs.
On the other hand, when you're doing some operation on the page that would cause the browser to point to another page -- for example, clicking a link or submitting a form -- then it's the responsibility of that page object to return the next page object.
Since I don't know enough about the relationships between your home page, account page, and result page to tell you exactly how it'd play out in your site, I'll use an online store app as an example instead.
Let's say you've got a SearchPage. When you submit the form on the SearchPage, it returns a ResultsPage. And when you click on a result, you get a ProductPage. So the classes would look something like this (abbreviated to just the relevant methods):
public class SearchPage {
public void open() {
return driver.get(url);
public ResultsPage search(String term) {
// Code to enter the term into the search box goes here
// Code to click the submit button goes here
return new ResultsPage();
public class ResultsPage {
public ProductPage openResult(int resultNumber) {
// Code to locate the relevant result link and click on it
return new ProductPage();
The test method to execute this story would look something like this:
public void testSearch() {
// Here we want to simulate the user going to the search page
// as if opening a browser and entering the URL in the address bar.
// So we instantiate it here in the test code.
SearchPage searchPage = new SearchPage();; // calls driver.get() on the correct URL
// Now search for "video games"
ResultsPage videoGameResultsPage ="video games");
// Now open the first result
ProductPage firstProductPage = videoGameResultsPage.openResult(0);
// Some assertion would probably go here
So as you can see, there's this "chaining" of Page Objects where each one returns the next one.
The result is that you end up with lots of different page objects instantiating other page objects. So if you've got a site of any considerable size, you could consider using a dependency injection framework for creating those page objects.
Well, I created my own Java classes which represent the pages:
Say, the below is code to represent home page. Here user can login:
public class HomePage{
private WebDriver driver;
private WebElement loginInput;
private WebElement passwordInput;
private WebElement loginSubmit;
public WebDriver getDriver(){
return driver;
public HomePage(){
driver = new FirefoxDriver();
public CustomerPage login(String username, String password){
loginInput = driver.findElement("username"));
passwordInput = driver.findElement("password"));
loginSubmit = driver.findElement("login"));;
return new CustomerPage(this);
And the page for Customer can look like this. Here I am demonstrating, how to get, say, logged in user:
public class CustomerPage{
private HomePage homePage;
private WebElement loggedInUserSpan;
public CustomerPage(HomePage hp){
this.homePage = hp;
public String getLoggedInUser(){
loggedInUserSpan = homePage.getDriver().findElement("usrLongName"));
return loggedInUserSpan.getText();
And the test can go like this:
public void testLogin(){
HomePage home = new HomePage();
CustomerPage customer = home.login("janipav", "extrasecretpassword");
Assert.assertEquals(customer.getLoggedInUser(), "Pavel Janicek");
You generally want to model what a user actually does when using your site. This ends up taking the form of a Domain Specific Language (DSL) when using page objects. It gets confusing with reusable page components though.
Now that Java 8 is out with default methods, reusable page components can be treated as mixins using default methods. I have a blog post with some code samples found here that explains this in more detail:
I suggest you use a framework that provides support for these patterns. Geb is one of the best one out there. Below is an example taken from their manual {
to LoginPage
assert at(LoginPage)
loginForm.with {
username = "admin"
password = "password"
assert at(AdminPage)
class LoginPage extends Page {
static url = ""
static at = { heading.text() == "Please Login" }
static content = {
heading { $("h1") }
loginForm { $("form.login") }
loginButton(to: AdminPage) { loginForm.login() }
class AdminPage extends Page {
static at = { heading.text() == "Admin Section" }
static content = {
heading { $("h1") }
I enjoy writing Selenium Webdriver tests using the Page Object pattern. But was personally annoyed at the verbosity and repetition of having to always explicitly instantiate and return the next page or page component. So with the benefit of Python's metaclasses I wrote a library, called Keteparaha, that automatically figures out what should be returned from a selenium page object's method calls.

how to pass parameter to a page?

I have a page that is loaded into a frame. in the code behind, i have a string variable called mode. What i want to do is when a hyperlink is clicked, open the page and set the mode
I was hoping to do it declaratively. I tried doing
and then adding the following to the code behind after the initialize component call
mode = this.NavigationContext.QueryString["mode"];
But I was getting a page not found error. I have a feeling I'm on another planet. I'm new to silverlight. How do i navigate to a page in this fashion and pass that argument?
Take a look at the UriMapper in you main page. The final UriMapping would normally be the catch all that looks like this:-
<uriMapper:UriMapping Uri="/{pageName}" MappedUri="/Views/{pageName}.xaml"/>
You will note the "/" at the beginning of the Uri and the corresponding page belongs in the "/Views" folder.
Use the attribute:-
make sure your page in the Views folder.
However I'm pretty sure you already have that. Your real problem is your attempt to access the NavigationContext in the execution the page constructor. Its not available at that point in the pages lifecycle. You should not attempt to use it until OnNavigatedTo is executed.
public partial class MyPage : Page
public MyPage()
protected override void OnNavigatedTo(NavigationEventArgs e)
string mode = null;
if (NavigationContext.QueryString.ContainsKey("mode"))
mode = NavigationContext.QueryString["mode"];
// Do stuff with mode.
The reason you are seeing "page not found error" is thats because the Nav apps ErrorWindow just assumes any failure to load a page was because it wasn't found. Which assuming you've coded your pages correctly is probably a reasonable assumption.