@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dialer);
        mCallerNumber = (EditText) findViewById(R.id.edit_text_caller_number);
    }
Simple Dialer Activity which shows an {@link EditText} field to enter a phone number. Upon
pressing the call button the number entered in the input field is send to the native Android
Dialer app via {@link Intent#ACTION_CALL}.

<p>
Furthermore this Activity contains a pick number button to starts dummy contacts activity to
demonstrate Intent stubbing.
ui/espresso/IntentsBasicSample/app/src/main/java/com/example/android/testing/espresso/IntentsBasicSample/DialerActivity.java