I have made an RCP application which starts by default on system startup. It has a login dialog which authenticates the user before creating workbench.
My application starts in system tray by default. Below is the code(I have only posted relevant code).
Application.java
public Object start(IApplicationContext context) {
Display display = PlatformUI.createDisplay();
minimizeToTray(display,context);
}
private void minimizeToTray(Display display,IApplicationContext context){
Shell displayShell = new Shell(display);
URL imageURL = Platform.getProduct().getDefiningBundle().getEntry(Platform.getProduct().getProperty("trayIcon"));
Image image = ImageDescriptor.createFromURL(imageURL).createImage();
//Create Tray and add listener for double click
trayItem.addSelectionListener(new SelectionAdapter() {
public void widgetDefaultSelected(SelectionEvent e) {
image.dispose();
item.dispose();
startLogin(); //Call login dialog and create workbench after authentication
displayShell.dispose();
}
});
//Close current splash screen.
context.applicationRunning();
//Do-event loop
while(!displayShell.isDisposed()){
if(!display.readAndDispatch()){
display.sleep();
}
}
}
When application starts, a splash screen is displayed. After adding application to system tray, I am closing the splash screen using context.applicationRunning(); and waiting for user to double click the tray icon.
After the user double clicks the icon, I want to display the splash screen again.
Related
I am developing an app in Xamarin.Forms, before I was trying to make a master detail page to become my MainPage when I logged in to my app, this I have already achieved. Now I have the problem that when I use the button behind the phone my app is miimiza and goes to the background which is the behavior I hope, but when I return to my app does not continue showing my master detail page, but returns to my LginPage.
It is as if my app was running twice or at least there were two instances of LoginPage existing at the same time, this is because in my LoginPage I trigger some DisplayAlert according to some messages that my page is listening through the MessaginCenter and they are they shoot twice.
Can someone tell me how I can return the same to my app on the master detail page and not restart in the strange way described?
LoginView.xaml.cs:
public partial class LogonView : ContentPage
{
LogonViewModel contexto = new LogonViewModel();
public LogonView ()
{
InitializeComponent ();
BindingContext = contexto;
MessagingCenter.Subscribe<LogonViewModel>(this, "ErrorCredentials", async (sender) =>
{
await DisplayAlert("Error", "Email or password is incorrect.", "Ok");
}
);
}
protected override void OnDisappearing()
{
base.OnDisappearing();
MessagingCenter.Unsubscribe<LogonViewModel>(this, "ErrorCredentials");
}
}
Part of my ViewModel:
if (Loged)
{
App.token = token;
Application.Current.MainPage = new RootView();
}
else
{
MessagingCenter.Send(this, "ErrorCredentials");
}
Thanks.
I hope this is in Android. All you can do is, you can override the backbuttonpressed method in MainActivity for not closing on back button pressed of the entry page. like below, you can add some conditions as well.
public override void OnBackPressed()
{
Page currentPage = Xamarin.Forms.Application.Current.MainPage.Navigation.NavigationStack.LastOrDefault();
if (currentPage != null)
{
if (currentPage.GetType().Name == "HomePage" || currentPage.GetType().Name == "LoginPage")
{
return;
}
}
base.OnBackPressed();
}
When you press the Home button, the application is paused and the
current state is saved, and finally the application is frozen in
whatever state it is. After this, when you start the app, it is
resumed from the last point it was saved with.
However, when you use the Back button, you keep traversing back in
the activity stack, closing one activity after another. in the end,
when you close the first activity that you opened, your application
exits. This is why whenever you close your application like this, it
gets restarted when you open it again.
Answer taken from this answer. The original question asks about the native Android platform, but it still applies here.
It means you have to Use Setting Plugin or save data in Application properties.
You have to add below code in App.xaml.cs file:
if (SettingClass.UserName == null)
MainPage = new LoginPage();
else
MainPage = new MasterDetailPage();
For Setting Plugin you can refer this link.
I have a button. If clicked a Dialog opens up. The Dialog always appears at the center of the screen even though I want to place it to a certain location.
Why is that? How can I set the location of my Dialog?
#Override
public void widgetSelected(SelectionEvent e) {
Dialog dialog = new MyDialog(PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(), "MyDialog");
dialog.open();
Point pt = ImageDisplayHelper.getDisplay().getCursorLocation();
System.out.println("location pt: "+pt); // pt is a valid location something like Point {1368, 220}
dialog.getShell().setLocation(pt); // no effect whatsoever
dialog.getShell().setLocation(10, 10); // no effect whatsoever
}
The dialog open method displays the dialog and waits for it to be closed. So setting the location after calling open is too late.
Instead call the create method of dialog, then set the location and finally call open:
dialog.create();
... set location
dialog.open();
An alternative is to override the
protected Point getInitialLocation(Point initialSize)
method in the dialog and return the location you want.
I want to start an activity and change the widget image button on click.
How can i do it? I don't know it properly.After much googling, it still is not solvable.
There are different ways to create a button.
I will use the programmatic way:
Source to create the button in one Activity class:
//making the container for the button
TableLayout.LayoutParams tableParams = new TableLayout.LayoutParams(MATCH_PARENT, WRAP_CONTENT);
TableLayout tableLayout = new TableLayout(this);
tableLayout.setLayoutParams(tableParams);
//making the button
Button button = new Button(this);
//making the class what will handler the click
button.setOnClickListener(new ClassWithBehavior());
//set the color of button state1
button.getBackground().setColorFilter(Color.parseColor("#ff00ff"), PorterDuff.Mode.MULTIPLY);
//adding the button at the container
tableLayout.addView(button);
source of the ClassWithBehavior:
private class ClassWithBehavior implements View.OnClickListener {
public void onClick(View button) {
//set the color of button state2
this.getBackground().setColorFilter(Color.parseColor("#00ff00"), PorterDuff.Mode.MULTIPLY);
}
}
create a new activity:
//need have first a Intent before change of the activity
Intent i = new Intent(a, Activity2.class);
//share data between old_activity and the new_activity
i.putExtra("id_tag_name_of_the_data_from_activity1_to_activity2",data);
//launch the new activity
this.startActivity(i);
Remember that every activity have its own variables, and views, if you not pass the state of button or the color at the new activity, this wouldn't have these info.
I'm going to use home button (Action bar App icon) as back button. I got it to work but not in the way i intended.
My MainActivity is an activity which holds (1) a drawer that shows a list of categories. And a Fragment that displays a list of items in the category chosen in the drawer.
when a item in the list is clicked, a new DetailActivity is started to show the details.
here starts the problem:
From the DetailActivity when i press Back button, it returns to the MainActivity as it was before clicking the item to show details. That is what I expect. However, when use home button as Up navigation, it starts the MainActivity as if I opened the app again. Not showing the list that was previously being shown.
I read in developer documents that for fragments I have to use: .add(detailFragment, "detail") And .addToBackStack() then commit.
But what am I suppose to add in add(---,"---"). And then how should I use it?!
this is my codes:
the method is the MainActivity that shows the content:
public void refreshDisplay(Context context, View view, String category, int i) {
List<Lesson> lessonByCategory = datasource.findByCategory(category, i);
final ListView lv = (ListView) view.findViewById(R.id.listView);
final ArrayAdapter<Lesson> adapter = new LessonListAdapter(context, lessonByCategory);
lv.setAdapter(adapter);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick (AdapterView<?> parent, View view, int position, long id) {
Log.i(LOGTAG, "onListItemClick called");
ArrayAdapter<Lesson> m_adapter = adapter;
// get the Lesson object for the clicked row
Lesson lesson = m_adapter.getItem(position);
Intent intent = new Intent(MainActivity.this, LessonDetailActivity.class);
intent.putExtra(".model.Lesson", lesson);
intent.putExtra("isStared", isStared);
startActivityForResult(intent, LESSON_DETAIL_ACTIVITY);
}
});
}
In my LESSON_DETAIL_ACTIVITY that shows the detail content I have this code to enable up navigation for home button:
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// I have some other cases here
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
And finally in the Manifest I used the code below to introduce MainActivity as the parrent of LessonDetailActivity:
<activity
android:name=".LessonDetailActivity">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.MainActivity" />
</activity>
I want the Home button as up navigation to behave like back button so that when its clicked it takes me to the MainActivity as it was before opening the LessonDetailActivity. The code above doesn't do that and every time I press Home in the action bar it starts the MainActivity from scratch.
Could anyone help me with this please?
I also should say that I'm new so I'd appreciate it if the answers were detailed.
I have created a Dialog with two buttons Yes, No, and then I have add action listener to them, my problem is that I want no button to hide the Dialog that I have created
the code is looks like:
dialog = new Dialog(title);
dialog.setDialogType(Dialog.TYPE_CONFIRMATION);
ta = new TextArea(text);
ta.getStyle().setBorder(Border.createEmpty());
ta.setEditable(false);
yesCommand = new Button("YES");
noCommand = new Button("NO");
yesCommand.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
LGBMainMidlet.getLGBMidlet().notifyDestroyed();
}
});
noCommand.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
Logger.Log("Bye Bye");
dialog = null;
System.gc();
}
});
dialog.addComponent(ta);
dialog.addComponent(yesCommand);
dialog.addComponent(noCommand);
dialog.show();
the code is not working for me, can anyone told me what is the problem?
B.N. I have used dialog.dispose(), but it exit the whole application
It is better to use
dialog.setTimeout(1000); the number show the time limit the dialog box wait in milliseconds. So by doing this you can exit the dialog form automatically.
Dialog.dispose() does not exit the whole application, it just closes the dialog.
If you have nothing in your application you might see nothing if you dispose the dialog.