DialogExampleActivity.java

package com.vgrec.espressoexamples.activities;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.TextView;

import com.vgrec.espressoexamples.R;

public class DialogExampleActivity extends ActionBarActivity {

    private TextView statusTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dialog_example);

        statusTextView = (TextView) findViewById(R.id.status_text);

        findViewById(R.id.confirm_dialog_button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showAlertDialog();
            }
        });
    }

    private void showAlertDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(R.string.dialog_title);
        builder.setMessage(R.string.dialog_message);
        builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                statusTextView.setText(getString(R.string.cancel));
            }
        });
        builder.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                statusTextView.setText(getString(R.string.ok));
            }
        });
        builder.create().show();
    }
}