android studio通讯录代码和布局文件

以下是一个简单的 Android Studio 通讯录应用的代码和布局文件：

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

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

</LinearLayout>

contact_list_item.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:padding="16dp">

    <TextView
        android:id="@+id/contact_name_text_view"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/contact_phone_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="16sp" />

</LinearLayout>

Contact.java:

public class Contact {
    private String mName;
    private String mPhoneNumber;

    public Contact(String name, String phoneNumber) {
        mName = name;
        mPhoneNumber = phoneNumber;
    }

    public String getName() {
        return mName;
    }

    public String getPhoneNumber() {
        return mPhoneNumber;
    }
}

MainActivity.java:

public class MainActivity extends AppCompatActivity {

    private ListView mContactListView;
    private ContactAdapter mAdapter;

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

        mContactListView = (ListView) findViewById(R.id.contact_list_view);

        ArrayList<Contact> contacts = new ArrayList<>();
        contacts.add(new Contact("Alice", "123-456-7890"));
        contacts.add(new Contact("Bob", "234-567-8901"));
        contacts.add(new Contact("Charlie", "345-678-9012"));

        mAdapter = new ContactAdapter(this, contacts);
        mContactListView.setAdapter(mAdapter);
    }

    private class ContactAdapter extends ArrayAdapter<Contact> {

        public ContactAdapter(Context context, ArrayList<Contact> contacts) {
            super(context, 0, contacts);
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if (convertView == null) {
                convertView = LayoutInflater.from(getContext())
                        .inflate(R.layout.contact_list_item, parent, false);
            }

            Contact contact = getItem(position);

            TextView nameTextView = (TextView) convertView.findViewById(R.id.contact_name_text_view);
            nameTextView.setText(contact.getName());

            TextView phoneTextView = (TextView) convertView.findViewById(R.id.contact_phone_text_view);
            phoneTextView.setText(contact.getPhoneNumber());

            return convertView;
        }
    }
}

这个应用程序只是简单地显示了一个联系人列表，每个列表项包含了联系人的姓名和电话号码。这个列表使用了自定义的列表项布局文件 `contact_list_item.xml` 和一个自定义的 `ContactAdapter` 类来显示数据。