Android™ Application Development - Bahar Ali Khan

Chapter 9: Peer-to-Peer Communication
300
5. At this point, the GUI will be complete, so starting the application should show you the screen
shown in Figure 9-3.
Figure 9-3
6. Create a new Array List of Strings within the EmergencyResponder Activity to store the phone
numbers of the incoming requests for your status. Bind the Array List to the List View, using an
Array Adapter in the Activity’s onCreate method, and create a new ReentrantLock object to
ensure thread safe handling of the Array List.
Take the opportunity to get a reference to the Check Box and to add Click Listeners for each
of the response buttons. Each button should call the respond method, while the Setup Auto
Responder button should call the startAutoResponder stub.
ReentrantLock lock;
CheckBox locationCheckBox;
ArrayList requesters;
ArrayAdapter aa;
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
}
lock = new ReentrantLock();
requesters = new ArrayList();
wireUpControls();
private void wireUpControls() {
locationCheckBox = (CheckBox)findViewById(R.id.checkboxSendLocation);