How to create a dialog inside onResponse method?

Question

Here is my dialog code

public void registrationSuccess(final Context context, String warning, String message) {
        alert = new AlertDialog.Builder(context);
        alert.setTitle(warning);
        alert.setMessage(message)
                .setCancelable(false)
                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        Intent i = new Intent(context, loginActivity.class).setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                        context.startActivity(i);
                    }
                });
        AlertDialog alertDialog = alert.create();
        alert.show();
    }

and I want to use it inside my onResponse method below

client.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
            System.out.println("Failure!!");
        }

        @Override
        public void onResponse(Call call, Response response) throws IOException {
            if(response.isSuccessful()) {
                registrationSuccess(getApplicationContext(), getResources().getString(R.string.congrats), getResources().getString(R.string.successfull_registration));
            } else {
                System.out.println("FAILED");

            }
        }

    });

getApplicationContext breaks the app with the following error showing in the console

java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.content.Context.getApplicationContext()' on a null object reference

With what should I replace context?

NOTE: its non-activity class

If is it in activity class then use `ActivityName.this` and if it is non-activity class then use `getApplicationContext();` — Piyush, May 09 '17 at 10:42
@Piyush its non activity class and using getApplicationContext() breaks the app with `java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.content.Context.getApplicationContext()' on a null object reference` error on the console — Behrouz Riahi, May 09 '17 at 10:45
@BehrouzRiahi in service you have any context ref at class level? — Lingeshwaran, May 09 '17 at 10:48
@Lingeshwaran it's non activity class. So `name.this` won't work! — Kaushal28, May 09 '17 at 10:55
@Kaushal28 If class extent Service then it will work I used that way. — Lingeshwaran, May 09 '17 at 11:06
@Lingeshwaran you mean I extend Service then I use classname.this? — Behrouz Riahi, May 09 '17 at 12:39

score 3 · Accepted Answer · answered May 09 '17 at 10:50

From activity class, when you initialize your class, pass the context like this:

new My_Non_ActivityClass(MainActivity.this);

now in your class create a constructor like this and get context:

Context context;
My_Non_ActivityClass(Context c){
     context = c;
}

Now you have context, use wherever you want like this:

public void registrationSuccess(context, String warning, String message) {
    alert = new AlertDialog.Builder(context);
    alert.setTitle(warning);
    alert.setMessage(message)
            .setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    Intent i = new Intent(context, loginActivity.class).setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    context.startActivity(i);
                }
            });
    AlertDialog alertDialog = alert.create();
    alert.show();
}

Or no need to pass context, just access it as it is global variable in your class.

NOTE: If you are in service, the service has its own context. Just use this.

Service is a Context, so Context context = this; do it at constructor and pass to that method too. — Lingeshwaran, May 09 '17 at 10:58

Bharat singh · Answer 2 · 2017-05-09T10:52:11.397

0

Create getter setter methods in Application class for context then with this use can get context across the application

change this line

registrationSuccess(null, getResources().getString(R.string.congrats), getResources().getString(R.string.successfull_registration));

With this

registrationSuccess(ApplicationControler.getContext(), getResources().getString(R.string.congrats), getResources().getString(R.string.successfull_registration));

edited May 09 '17 at 10:52

answered May 09 '17 at 10:46

Bharat singh

504
7
17

you mean modifying Application class? how can I access it? I am new to android – Behrouz Riahi May 09 '17 at 14:15

How to create a dialog inside onResponse method?

2 Answers2