Error with getApplicationContext(), Dialogs

Question

I can't create a Pogress dialog, because, getApplicationContext(), return null

Problem to create ProgressDialog

public void Diag(Boolean Show){
    ProgressDialog dialog = new ProgressDialog(getApplicationContext());
    if (Show){
        // (Dialog) Wait time
        dialog.setMessage("Iniciando sesión...");
        dialog.setCancelable(false);
        dialog.show();
    }else{
        dialog.dismiss(); // (Dialog) End Wait
    }
}

Error:

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{RubenPX.ROX/RubenPX.ROX.Main}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.content.Context.getApplicationContext()' on a null object reference

EDIT:

I tried this, but not work

public class Diag extends Application{
    ProgressDialog dialog = new ProgressDialog(getApplicationContext());
    public void Show(){
        // (Dialog) Wait time
        dialog.setMessage("Iniciando sesión...");
        dialog.setCancelable(false);
        dialog.show();
    }

    public void Dimiss(){
        dialog.dismiss(); // (Dialog) End Wait
    }
}

dialog always created by the activity context – Tanveer Munir Jan 27 '19 at 13:46 — Tanveer Munir, Jan 27 '19 at 13:46
its never created by application context – Tanveer Munir Jan 27 '19 at 13:48 — Tanveer Munir, Jan 27 '19 at 13:48

score 1 · Accepted Answer · answered Jan 27 '19 at 13:53

You should use Activity Context intead of using application context

Like this:

public void Diag(Boolean Show, Context context){
    ProgressDialog dialog = new ProgressDialog(context);
    if (Show){
        // (Dialog) Wait time
        dialog.setMessage("Iniciando sesión...");
        dialog.setCancelable(false);
        dialog.show();
    }else{
        dialog.dismiss(); // (Dialog) End Wait
    }
}

Must read this

Error with getApplicationContext(), Dialogs

1 Answers1