Question

My app opens a new view from the main view with:

Intent ElementsIntent = new Intent(this, ElementList.class);
startActivityForResult(ElementsIntent, 0);

which shows a list of elements and when pushing 1 of these elements a view opens up the same way as before with a new Activity. Inside this view I would like to show a AlertDialog in a button click handler, but when I call show() the app crashes.

I am pretty sure it has got somthing to do with the Context not being correct according to where I try and open the dialog, but I have tried making a static context from the main view, I have tried with element.this, which is the class connected to the activity, and I have tried getApplicationContext, and all of these result in an app crash.

I hope someone can explain what I am doing wrong.

Thanks.

Here is the AlertDialog code which crashes:

public void GoBackClickHandler(View v)
{
    AlertDialog.Builder builder = new AlertDialog.Builder(ElementItem.this);
    builder.setMessage("Skal ændringer i besvarelse gemmes?")
           .setCancelable(false)
           .setPositiveButton("Ja", new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int id) {
                   dialog.cancel();
                if(inputIsValue())
                {
                    UpdateELement task = new UpdateELement();
                    task.applicationContext = ElementItem.this;
                    task.execute(1);
                }
               }
           })
           .setNegativeButton("Nej", new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int id) {
                    dialog.cancel();
                    finish();
               }
           });
    AlertDialog alert = builder.create();
    alert.show();       
}

If I move this code to the OnCreate, then the alert shows just fine and no app crash. It is only if I place it in a ClickHandler it crashes.

Answer 1

I finally found a soloution to this issue.

I had to save the context of the Activity in a variable in the onCreate method and then use this in the ClickHandler AlertDialog call, then everything works.

Hope this will be of help to someone else with this annoying problem.