用代码编写一个安卓通讯录管理系统

好的，以下是一个简单的安卓通讯录管理系统的代码：

1. 创建联系人类

public class Contact {
    private String name;
    private String phone;

    public Contact(String name, String phone) {
        this.name = name;
        this.phone = phone;
    }

    public String getName() {
        return name;
    }

    public String getPhone() {
        return phone;
    }
}

2. 创建通讯录管理类

public class ContactManager {
    private List<Contact> contacts;

    public ContactManager() {
        contacts = new ArrayList<>();
    }

    public void addContact(Contact contact) {
        contacts.add(contact);
    }

    public void removeContact(int position) {
        contacts.remove(position);
    }

    public List<Contact> getAllContacts() {
        return contacts;
    }
}

3. 创建适配器类

public class ContactAdapter extends RecyclerView.Adapter<ContactAdapter.ContactViewHolder> {
    private List<Contact> contacts;

    public ContactAdapter(List<Contact> contacts) {
        this.contacts = contacts;
    }

    @NonNull
    @Override
    public ContactViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_contact, parent, false);
        return new ContactViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ContactViewHolder holder, int position) {
        Contact contact = contacts.get(position);
        holder.tvName.setText(contact.getName());
        holder.tvPhone.setText(contact.getPhone());
    }

    @Override
    public int getItemCount() {
        return contacts.size();
    }

    static class ContactViewHolder extends RecyclerView.ViewHolder {
        TextView tvName;
        TextView tvPhone;

        ContactViewHolder(@NonNull View itemView) {
            super(itemView);
            tvName = itemView.findViewById(R.id.tv_name);
            tvPhone = itemView.findViewById(R.id.tv_phone);
        }
    }
}

4. 创建界面布局

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/edit_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Name" />

    <EditText
        android:id="@+id/edit_phone"
        android:layout_below="@id/edit_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Phone" />

    <Button
        android:id="@+id/btn_add"
        android:layout_below="@id/edit_phone"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Add Contact" />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_below="@id/btn_add"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

item_contact.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:padding="16dp">

    <TextView
        android:id="@+id/tv_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp" />

    <TextView
        android:id="@+id/tv_phone"
        android:layout_marginStart="16dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp" />

</LinearLayout>

5. 创建 MainActivity 类

public class MainActivity extends AppCompatActivity {
    private EditText editName;
    private EditText editPhone;
    private Button btnAdd;
    private RecyclerView recyclerView;
    private ContactManager contactManager;
    private ContactAdapter contactAdapter;

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

        editName = findViewById(R.id.edit_name);
        editPhone = findViewById(R.id.edit_phone);
        btnAdd = findViewById(R.id.btn_add);
        recyclerView = findViewById(R.id.recycler_view);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        contactManager = new ContactManager();
        contactAdapter = new ContactAdapter(contactManager.getAllContacts());
        recyclerView.setAdapter(contactAdapter);

        btnAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = editName.getText().toString();
                String phone = editPhone.getText().toString();
                Contact contact = new Contact(name, phone);
                contactManager.addContact(contact);
                contactAdapter.notifyDataSetChanged();
            }
        });
    }
}

以上就是一个简单的安卓通讯录管理系统的代码。