Some changes need to be done in ImageTargetsRenderer (as explained in the article);

however, the Button should be added in the ImageTargets.java; then, from ImageTargetsRenderer you will need some method that calls to another method in ImageTargets.java to show/hide the button

Ok....

I mean from all of that, every change i make should be declare or initiate in imagetargetrendere. java ?

this code is to show Toast in imagetarget.java , so how about to show Button ?

The article shows an example of how to show a toast message, as this is one of many possible actions that you can do in the UI, so to exaplain the main concept of how to trigger UI changes in response to target detection;

but then how to specifcally show a Button is a simple matter of Android programming...

Dear Al, and other member

I find this thread related to my case,

after trying to implement the related link on : https://developer.vuforia.com/forum/faq/android-how-can-i-update-my-ui-response-tracking-events

i need to show 3 buttons on UI after tracking events,

and try to put this code into imagetarget.java :

public void addListenerOnButton()
imageButton = (ImageButton) findViewById(R.id.button_web);
 
imageButton.setOnClickListener(new OnClickListener() {
 
@Override
public void onClick(View arg0) {
 
Intent myWebLink = new Intent (android.content.Intent.ACTION_VIEW);
myWebLink.setData(Uri.parse("http://google.com"));
startActivity(myWebLink);
 

the problem is :

I. In Imagertargetrendering.java

// A handler object for sending messages to the main activity thread
    public static Handler mainActivityHandler;

    // Called from native to display a message
    public void displayMessage(String text)
    {
        // We use a handler because this thread cannot change the UI
        Message message = new Message();
        message.obj = text;
        mainActivityHandler.sendMessage(message);
    }

this code is to show Toast in imagetarget.java , so how about to show Button ?

Great.

Thank you Alessandro,

my mistake was that i didnt but my method not after the initApplicationAR() method.

Now it works :-)

Have you tried adding your button programmatically on top of the mUILayout ?

This should work (as I just verified):

Hi Alessandro,

i put it now in the ImageTarget.java

 mC = (Button) mUILayout
                .findViewById(R.id.buttonss);

        // Sets the Close Button functionality
        mC.setOnClickListener(new OnClickListener()
        {
            public void onClick(View v)
            {
               Uri...
               
        
            }
    
    });

App is starting but there is no reaktion on the button when i clicked...

Hi, make sure that your clickable view (button) is added on top of other views.

In ImageTargets.java, a good place where to add custom widgets is the mUILayout (you can find it in the code).

For more information about handling views, you can also consult the Android developer guide:

http://developer.android.com/reference/android/view/View.html

http://developer.android.com/guide/topics/ui/declaring-layout.html