Show dialogue outside of activity

Question

I am trying to launch a dialogue from a non activity java class. Can this be done if so how?

Answer 1

You can show a Dialog outside of an activity, but you'll need a reference to a Context object.

This class isn't an activity but can create and show dialogs:

public class DialogExample {
  public Context mContext;

  public DialogExample(Context context) {
    mContext = context;
  }

  public void dialogExample() {
    AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
    builder.setMessage("Dialog created in a separate class!");
    builder.show();
  }

Then you can reference this in an Activity:

public void onCreate(Bundle icicle) {
  super.onCreate(icicle);

  DialogExample otherClass = new DialogExample(this);
  otherClass.dialogExample();
}

This can be handy when you have utility methods for creating similar dialogs that are used in multiple activities in an app.