I've implemented the Hello Gallery tutorial from the Android web:
http://developer.android.com/resources/tutorials/views/hello-gallery.html
The tutorial shows what happens when you select an image from the gallery - just display its position.
However, I also want to display the image in full size when an image is selected. Can someone tell how to do that?
Here's the code when an image is clicked:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Gallery g = (Gallery) findViewById(R.id.gallery);
g.setAdapter(new ImageAdapter(this));
g.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView parent, View v, int position, long id) {
Toast.makeText(HelloGallery.this, "" + position, Toast.LENGTH_SHORT).show();
}
});
}
I unsuccessfully tried adding another 'ImageView' in main.xml, but it won't let me place that on the layout. May be because it's gallery layout?
Thanks.
In your onClick() you probably want to set the layout of the image to fill_parent with something like:
imageView.setLayoutParams(new Gallery.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.FILL_PARENT));
try this
i.setScaleType(ImageView.ScaleType.FIT_XY);
Related
I have no idea why the background color doesn't work.
I want to change color when the button is clicked.
This is the screenshot of the problem:
https://gyazo.com/e2b8a9eb269562299bea441c18af4ce0
There is no reason for you to use that 'If' statement and that is not OK in any case, as you can see you are getting error also.
You only need to do subscription to the 'Click' event handler. So, remove the 'If' statement, you don't need it!
Your method 'ChangeColorToRed' will be called only when user clicks on that button.
Code for changing background color to red of your button looks like this:
protected override void OnCreate(Bundle savedInstanceState)
{
// ...
// other code
// ...
ScreenClickButton.Click += ChangeColorToRed;
}
private void ChangeColorToRed(object sender, EventArgs e)
{
ScreenClickButton.SetBackgroundColor(color: Color.Red);
}
Wish you good luck with coding!
Can someone provide an example of how to use the IconTabbedPage in Iconize, preferably in Xaml? I have an IconTabbedPage with IconNavigation pages as children, all defined in Xaml. I then set the Icon property of the subpages by specifiying the font awesome name (“fa-home”). I tried to set the title as well, but neither of these will render the icon. I have search (a lot) for examples of the IconTabbedPage but couldn’t find any in Xaml. Additional bonus if you can provide an example of how to use the icons in a list cell context action.
Looking into #Niklas Code, you can create a tabbed page with a base class that inherits from IconTabbedPage , then your xaml will look like this.
<icon:IconTabbedPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:icon="clr-namespace:Plugin.Iconize;assembly=Plugin.Iconize"
....
>
<icon:IconTabbedPage.Children>
<ContentPage Title="Build" Icon="md-build">
</ContentPage>
</icon:IconTabbedPage.Children>
I hope it will help somebody
I think you can take a look on Sample on GitHub
[\[assembly: XamlCompilation(XamlCompilationOptions.Compile)\]
namespace Iconize.FormsSample
{
public class App : Application
{
public App()
{
// The root page of your application
var tabbedPage = new IconTabbedPage { Title = "Iconize" };
foreach (var module in Plugin.Iconize.Iconize.Modules)
{
tabbedPage.Children.Add(new Page1
{
BindingContext = new ModuleWrapper(module),
Icon = module.Keys.FirstOrDefault()
});
}
MainPage = new IconNavigationPage(tabbedPage);
}
protected override void OnStart()
{
// Handle when your app starts
}
protected override void OnSleep()
{
// Handle when your app sleeps
}
protected override void OnResume()
{
// Handle when your app resumes
}
}
}][1]
My app has 10 pages and all of them have black background. I want to let user change background color of all pages using radioButton in my app. How can I do this in easiest way?
Go through these blogs
1. Theme Forcing for Windows Phone 7 or,
2. Windows Phone Mango Custom application Theme
these might prove helpful to you. You can study these and modify to put them in your settings page.
Thank You :)
Ok so you have 10 pages and on each page you want to change the background colour of those pages through the settings menu. What you can do is use the Windows Phone IsolatedStorageSettings.
Firstly you want to initialize the IsolatedStorageSettings. You can do that like this:
IsolatedStorageSettings MyAppSettings = IsolatedStorageSettings.ApplicationSettings;
Then you will have to set a default value for it so it doesn't throw an exception. You can do this:
MyAppSettings.Add("PageBackgroundColor", "#000000"); // you can set whatever the default colour you want here. i.e. Black
the best place i think would be is to add this code in:
private void Application_Launching(object sender, LaunchingEventArgs e)
{
if (IsolatedStorageSettings.ApplicationSettings.Contains("PageBackgroundColor"))
{
// Don't do anything because you've already set the default background colour for the pages
}
else
{
// add the default color
}
}
Now in your MainPage you can reinitialize the IsolatedStorageSettings. Once you've done that you will want to get the value of the setting and depending on the value you will want to change the background color. To read the value:
string Sortval = (string)MyAppSettings["PageBackgroundColor"];
You can add this in the:
protected override void OnNavigatedTo(NavigationEventArgs e)
{
}
Or
public MainPage
{
InitializeComponent();
}
Remember that public MainPage will only run once and the OnNavigatedTo runs every time the page is loaded so if you want to update the background color right after adding the setting, OnNavigatedTo is the way to go but if you want to apply the changes after a restart, public Mainpage is it.
Now to read the value and change it you want to do something like:
string val = (string)MyAppSettings["PageBackgroundColor"];
if (val == "#000000")
{
//change to black
}
else if (val == "your hex color")
{
//change to whatever color
}
else if (val == "another hex color")
{
//...
}
Now to save the value you want to reinitialize the IsolatedStorageSettings in your settings page and to save the values it would be something like this:
MyAppSettings.Remove("PageBackgroundColor");
MyAppSettings.Add("PageBackgroundColor", "your hex color");
MyAppSettings.Save();
This is untested however It should give you the very basic idea on how to do it in terms of saving and loading setting and then applying it
I taken two Images & added event (MouseButtonDown) for them.
When first image handles event to open Gallery. Second image handles events for open camera.
When user has choosed his image from the gallery, I want to navigate to next page. Its navigates. But before completing navigation process, it displays MainPage & then moves toward next page. I didnt want to display the MainPage once user chooses the image from the gallery.
Plz help.
Thanks in advance.
public partial class MainPage : PhoneApplicationPage
{
PhotoChooserTask objPhotoChooser;
CameraCaptureTask cameraCaptureTask;
// Constructor
public MainPage()
{
InitializeComponent();
objPhotoChooser = new PhotoChooserTask();
objPhotoChooser.Completed += new EventHandler<PhotoResult>(objPhotoChooser_Completed);
cameraCaptureTask = new CameraCaptureTask();
cameraCaptureTask.Completed += new EventHandler<PhotoResult>(objCameraCapture_Completed);
}
void objPhotoChooser_Completed(object sender, PhotoResult e)
{
if (e != null && e.TaskResult == TaskResult.OK)
{
//Take JPEG stream and decode into a WriteableBitmap object
App.CapturedImage = PictureDecoder.DecodeJpeg(e.ChosenPhoto);
//Delay navigation until the first navigated event
NavigationService.Navigated += new NavigatedEventHandler(navigateCompleted);
}
}
void navigateCompleted(object sender, EventArgs e)
{
//Do the delayed navigation from the main page
this.NavigationService.Navigate(new Uri("/ImageViewer.xaml", UriKind.RelativeOrAbsolute));
NavigationService.Navigated -= new NavigatedEventHandler(navigateCompleted);
}
void objCameraCapture_Completed(object sender, PhotoResult e)
{
if (e.TaskResult == TaskResult.OK)
{
//Take JPEG stream and decode into a WriteableBitmap object
App.CapturedImage = PictureDecoder.DecodeJpeg(e.ChosenPhoto);
//Delay navigation until the first navigated event
NavigationService.Navigated += new NavigatedEventHandler(navigateCompleted);
}
}
protected override void OnBackKeyPress(System.ComponentModel.CancelEventArgs e)
{
e.Cancel = true;
}
private void image1_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
objPhotoChooser.Show();
}
private void image2_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
cameraCaptureTask.Show();
}
To my knowledge when you use one of the choosers, like the Photo gallery or the camera, when your application is activating it will take it back to the page you left it. I don't think there is a way to get around this itself. What you would have to do is catch the Activating event in your main page code and Navigate to the desired page from there.
Now I am not completely sure how you would pass the image from the MainPage to the target page. It does not look like there is a property in the Navigation service to store this value. But you could either set it in an application wide variable, ModelView or even store it in the Isolated Storage area.
You could work around this by navigating to an intermediate blank page and have that intermediate page launch the tasks. When the tasks are completed you can then navigate as normal to your new page and only this blank page will show in transit.
Chris is correct that some of the tasks will navigate away from your app (effectively tombstoning it) and will the re-activate your application when the user returns from the task. For the camera this is particularly difficult, as to my knowledge there is no simple way to detect when you are returning from the camera. Also the camera doesn't work when attached to the debugger or Zune software (at least this is true on my HTC Surround), which makes troubleshooting quite difficult!
In my WP7 Barcode Scanning application I ended up using flags on the PhoneApplicationService class to help track where the navigation events are coming from. Something like:
PhoneApplicationService.Current.State["ReturnFromSampleChooser"] = true;
You can then check for these flags in the PhoneApplicationPage_Loaded or OnNavigatedTo method of your main page and redirect to the desired page as needed. Just make sure to clear the flag and be careful to not cause any loops in the navigation, as that might make your app fail certification (back button must ALWAYS work correctly).
For an example of how to use the camera and set/clear flags using PhoneApplicationService check out the source code for the Silverlight ZXing Barcode Library. You can download the full source here or browse the files online.
Is there a way to have a SWT buuton with both image and text in a view? I have tried embedding Swings in SWT and the view looks exactly as I want, but when there is an operation going on, this view doesnot load till it gets over. This makes my perspective look unstable. Please help.
What OS are you using? On Windows XP/Vista/Windows 7, GTK+ and OSX you can just set the text and the image. E.g.
public class ButtonView extends ViewPart
{
private Button m_button;
public void createPartControl(Composite parent)
{
m_button = new Button(parent, SWT.NONE);
m_button.setText("My Button");
m_button.setImage(JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_ERROR));
}
public void setFocus()
{
m_button.setFocus();
}
}