AndroidAnnotations——Adapters and lists 适配器和列表

Adapters and lists

This is just a simple demonstration of how you could handle

Adapters

and

AdapterViews

in
a simple way with AndroidAnnotations.

这是一个使用AndroidAnnotations处理

Adapters

和

AdapterViews

的简单示例

Let's say you have a

Person

class:

让我们假设你有这么一个

Person

类：

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:

和一个

PersonFinder

接口：

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.

我们想创建

PersonListActivity

来列出所有有效人员。因此，我们需要一个

PersonListAdapter

来绑定数据到视图上，

PersonItemView

是列表项的视图。

The

PersonItemView

will use
one

TextView

for the first name, and one

TextView

for
the last name:

PersonItemView

将使用一个

TextView

显示first
name，另一个

TextView

显示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.
请注意，创建一个有子视图注入的自定义视图组不需要使用View Holder Pattern。

There's a

PersonFinder

implementation,
let's say

InMemoryPersonFinder

, that is annotated with

@EBean

.
We won't describe this implementation.

InMemoryPersonFinder

是

PersonFinder

的实现类，用

@EBean

注解。我们不再描述这个实现类。

The adapter directly manipulates it to bind its data and create the corresponding views:
适配器直接操作实现类，并绑定数据，创建相应的视图：

@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.

PersonListActivity

绑定

PersonListAdapter

到一个

ListView

视图上，当视图项PersonItemView被单击时，显示一句toast。

@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();
}
}

本文档的简单示例下载