adapters and lists - PerfectCarl/androidannotations GitHub Wiki
This is just a simple demonstration of how you could handle Adapters and AdapterViews in a simple way with AndroidAnnotations.
Let's say you have a Person class:
public class Person {
public final String firstName;
public final String lastName;
public Person(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
}and a PersonFinder interface:
public interface PersonFinder {
List<Person> findAll();
}We want to create a PersonListActivity that lists all the available persons. For that, we'll need a PersonListAdapter that binds the data to the views, and a PersonItemView that is the view for one item in the list.
The PersonItemView will use one TextView for the first name, and one TextView for the last name:
@EViewGroup(R.layout.person_item)
public class PersonItemView extends LinearLayout {
@ViewById
TextView firstNameView;
@ViewById
TextView lastNameView;
public PersonItemView(Context context) {
super(context);
}
public void bind(Person person) {
firstNameView.setText(person.firstName);
lastNameView.setText(person.lastName);
}
}Notice that creating a custom view group that has its child views injected removes the need to use a View Holder Pattern.
There's a PersonFinder implementation, let's say InMemoryPersonFinder, that is annotated with @EBean. We won't describe this implementation.
The adapter directly manipulates it to bind its data and create the corresponding views:
@EBean
public class PersonListAdapter extends BaseAdapter {
List<Person> persons;
@Bean(InMemoryPersonFinder.class)
PersonFinder personFinder;
@RootContext
Context context;
@AfterInject
void initAdapter() {
persons = personFinder.findAll();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
PersonItemView personItemView;
if (convertView == null) {
personItemView = PersonItemView_.build(context);
} else {
personItemView = (PersonItemView) convertView;
}
personItemView.bind(getItem(position));
return personItemView;
}
@Override
public int getCount() {
return persons.size();
}
@Override
public Person getItem(int position) {
return persons.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
}The PersonListActivity binds the PersonListAdapter to a ListView, and displays a toast when a PersonItemView is clicked.
@EActivity(R.layout.person_list)
public class PersonListActivity extends Activity {
@ViewById
ListView personList;
@Bean
PersonListAdapter adapter;
@AfterViews
void bindAdapter() {
personList.setAdapter(adapter);
}
@ItemClick
void personListItemClicked(Person person) {
makeText(this, person.firstName + " " + person.lastName, LENGTH_SHORT).show();
}
}