在程序界面建立一个ListView组件，组件分四行，每行三项，分别显示“赵林 男 20；钱杰 男 24；孙红 女 22；李成 男 29”，点击ListView组件某一行，在Toast组件中显示“你选择了XX”。

可以通过自定义Adapter来实现ListView的展示，并使用OnItemClickListener来监听ListView的点击事件，在点击事件中通过Toast来展示选择的内容。具体实现请参考以下代码：

1. 创建一个Model类，用于存储每一项的数据：

public class Person {
    private String name;
    private String gender;
    private int age;

    public Person(String name, String gender, int age) {
        this.name = name;
        this.gender = gender;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public String getGender() {
        return gender;
    }

    public int getAge() {
        return age;
    }
}

2. 创建一个自定义Adapter类，用于展示ListView中的每一项：

public class PersonAdapter extends BaseAdapter {
    private List<Person> personList;
    private Context context;

    public PersonAdapter(List<Person> personList, Context context) {
        this.personList = personList;
        this.context = context;
    }

    @Override
    public int getCount() {
        return personList.size();
    }

    @Override
    public Object getItem(int position) {
        return personList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            convertView = LayoutInflater.from(context).inflate(R.layout.item_person, parent, false);
            holder = new ViewHolder();
            holder.nameTextView = convertView.findViewById(R.id.name_text_view);
            holder.genderTextView = convertView.findViewById(R.id.gender_text_view);
            holder.ageTextView = convertView.findViewById(R.id.age_text_view);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        Person person = personList.get(position);
        holder.nameTextView.setText(person.getName());
        holder.genderTextView.setText(person.getGender());
        holder.ageTextView.setText(String.valueOf(person.getAge()));

        return convertView;
    }

    private static class ViewHolder {
        TextView nameTextView;
        TextView genderTextView;
        TextView ageTextView;
    }
}

3. 在布局文件中添加ListView组件：

<ListView
    android:id="@+id/list_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

4. 在Activity中初始化ListView和Adapter，并设置OnItemClickListener：

public class MainActivity extends AppCompatActivity {
    private ListView listView;

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

        List<Person> personList = new ArrayList<>();
        personList.add(new Person("赵林", "男", 20));
        personList.add(new Person("钱杰", "男", 24));
        personList.add(new Person("孙红", "女", 22));
        personList.add(new Person("李成", "男", 29));

        PersonAdapter adapter = new PersonAdapter(personList, this);

        listView = findViewById(R.id.list_view);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                String name = personList.get(position).getName();
                Toast.makeText(MainActivity.this, "你选择了" + name, Toast.LENGTH_SHORT).show();
            }
        });
    }
}

需要注意的是，item_person.xml文件是每一项的布局文件，可以根据需要自行定义。