Develop Reference

android kotlin click listener loses its "click methods" after some time

Hi I'm implementing click listeners in the following way but after some time the methods and variables inside the listener's closure get the wrong values or something. Let me explain the implementation of the listener a little better a for loop creates the listener for a set of image views then later in the program the for loop is called a second time and it resets the listener methods and variables to different values. Everything works great for about 30 minutes but then for some reason, the listener's methods and variables start having the wrong values. Has anybody ever heard of this behavior or can tell me where I've gone wrong with the code? Keep in mind that the listener I'm about to paste here is just a small piece of a 1014 line class. I'm hoping somebody can spot How I'm implementing the listener wrongly and can give me some advice on how to "reset" the listener so that it's variables and values stay over time. Hopefully you can read the code without putting it in an editor but feel free to copy it for readability's sake Here is the code for the image view listener with comments.
//image views are held in an array
//set an image view in its imageview container
imgArr0[slotId1].invalidate()
imgArr0[slotId1].setImageDrawable(null)
//drw is not defined in this example
imgArr0[slotId1].setImageDrawable(drw)
/*if video or image id is set to image then set a listener for the image
*/
/*slotId1 is not defined in this example but it is simply a counter to iterate over the ImageView array
*/
if (videoOrImageId0[slotId1] == "image") {
//null any listeners that might be attached to the image view
imgArr0[slotId1].setOnClickListener(null)
//set or reset the listener
imgArr0[slotId1].setOnClickListener() {
`enter code here`//if the current config is portrait then set a new image image
if (currentConfig0 == "portrait0") {
act0.lrgImage0.invalidate()
act0.lrgImage0.setImageDrawable(null)
/*drw is not defined in this example but works fine in the production script
*/
act0.lrgImage0.setImageDrawable(drw)
}
--calmchess
ccc tv application with problem.
(https://i.stack.imgur.com/PjdbN.jpg)![enter image description here](https://i.stack.imgur.com/FaMnc.

I was able to partially solve this question by destroying all the image views and their associated click listeners then rebuilding those... However I don't consider this issue completely solved so if anybody can provide a better solution I'd love to hear it because rebuilding the images every few minutes has to be using a lot of unnecessary hardware resources.
--calmchess

how to implement text with reference in Android

I want to create a book in android. It's text come from database and every section of this text has a reference.I need to put clickable image inside text to show reference and when I click on image something like Toast which contain reference list will appear.
I didn't see something like that in typical app. any body have any suggestion to implement it ?

If I understand the question correctly, you will have a clickable image inside the activity. Next add a onClickListener to the image, inside of this display the toast with the reference.
ImageView img = (ImageView) findViewById(R.id.img);
img.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(this, "https://www.google.com/", Toast.LENGTH_SHORT).show();
});
}
If you have multiple clickable images then you might be better off implementing the interface View.OnClickListener and adding the onClick method.

I think the best way is to use Linkify class provided by Android Framework - see http://developer.android.com/reference/android/text/util/Linkify.html for details.
Also you can play with google sample - https://github.com/googlesamples/android-TextLinkify

How to show an image for a specific time period?

In my application i need to decrypt the certain message format, to extract information like message id, timeout and so on.i need to show an corresponding image for the given id as well as to show it for the mentioned time period.
For that i have created one custom layout to show the image and other details. i'm using imageview for displaying the image. but dont know how to set timeiut for that?
Do anyone have idea on that?

You can easily use Handler to do that, like this
imageuser.setImageBitmap(bitmapObject);
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
imageuser.setImageBitmap(null);
}
}, 5000);
here, imageuser is your ImageView and replace 5000 with your specific time in miliseconds.

Just use it like whenever you want to show image just call your UI and start a thread for the given time you want to show the image and when the time complete just make that ui visibility gone,this is the logic try it in your own way.
thanks

Displaying an array of objects, one at a time through a single dialog... instead of several dialogs

In my application I have a list of questions stored in an ArrayList, and I want to display a dialog that shows one question, and then continues to the next one after the question is answered. The way that I'm currently doing it (iterating through a loop) hasn't been working because it just layers all of the dialogs on top of one another all at once which causes a host of other issues. What I'm looking for is a way to still iterate through the questions, but just change the layout of the dialog each time until it has finished each question in the list. Can anyone give me a good pointer for how to get this going?

You can make a function that takes title and message as parameters and shows a dialog.
showDialog(String title, String message){ // Show dialog code here}
Within that dialog's answer button's listener call another function (showQuestion(currentQuestion)) that iterates the arrayList till it is over
int currentQuestion=0;
ArrayList<QuestionObject> questionList;
showQuestion(int i){
if(i<questionList.size()){
showDialog(questionList.get(i).getTitle,questionList.get(i).getMessage);
currentQuestion++;
}else{
//quiz is over
}
}

I assume you mean that you just want to change 1 single layout(created within XML i.e main.xml). In order to do this, make sure that the class your working on is pointing to that layout. From there (assuming your using an Event listener for when the user submits an answer) you can change do as you want by the following:
TextView txt = (TextView) findViewById(R.id.textView); // references the txt XML element
and in your Event listener, if the answer is correct then change(Have i be a global variable thats initially set to 0).
if(i<arrayList.size()){
txt.setText(arrayList.get(++i));
}else{
txt.setText("You Finished");
}
From there, in the else statement, you can change arrayLists and reset i to 0;

If you are trying to use the positive, neutral, and negative buttons; then you may have problems with multiple dialogs. Try defining a customized layout with your own TextViews, ListViews, and Buttons. You can implement listeners and everything else like a regular layout. Then just pass your customized layout to the dialog through AlertDialog.Builder.setView().
PS If you include code examples of what you are currently doing we can provided answers that are less vague.

complex listeviewitem image load hang application problem

I am suing Listview and customize listview to display image inside a list item.
I want display image with every search result.
to display complext listeim i am following the following example
http://developer.android.com/guide/samples/ApiDemos/src/com/example/android/apis/view/List4.html
inside wrapper class i am initiating new thread for every new list item's image so that i won't dealy the displaying image.
my code is below
new Handler().post(new Runnable(){
#Override
public void run() {
Drawable dImage = Util.getImageFromURL(imageURL);
getImageIcon().setImageDrawable(dImage);
}
});
mean 10 images initiates 10 different image loading threads other static data is not inside thread.
problem arises when during image loading page application getting hang it should not hang.... any idea what to do ?
alt text http://img509.imageshack.us/img509/7519/thumbnailx.jpg

Use a background operation to retrieve your images, such as an AsyncTask. All your new Handler().post() stuff does is delay the work by a nanosecond, not have it be performed in the background.
Also, if you are going to use Handlers, just create one.