实现简单通讯录的Android Studio 完整代码

以下是一个简单通讯录的Android Studio完整代码，包括布局文件和Java代码：

1.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">

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

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

    <Button
        android:id="@+id/buttonAdd"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Add" />

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

</LinearLayout>

2.布局文件list_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:orientation="vertical">

    <TextView
        android:id="@+id/textViewName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Name" />

    <TextView
        android:id="@+id/textViewPhone"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Phone" />

</LinearLayout>

3.Java代码MainActivity.java：

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private EditText editTextName, editTextPhone;
    private Button buttonAdd;
    private ListView listViewContacts;
    private ArrayList<Contact> contactList;
    private ContactListAdapter contactListAdapter;

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

        editTextName = findViewById(R.id.editTextName);
        editTextPhone = findViewById(R.id.editTextPhone);
        buttonAdd = findViewById(R.id.buttonAdd);
        listViewContacts = findViewById(R.id.listViewContacts);

        contactList = new ArrayList<>();
        contactListAdapter = new ContactListAdapter(this, R.layout.list_item_contact, contactList);
        listViewContacts.setAdapter(contactListAdapter);

        buttonAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = editTextName.getText().toString();
                String phone = editTextPhone.getText().toString();
                if (name.isEmpty() || phone.isEmpty()) {
                    Toast.makeText(MainActivity.this, "Please enter name and phone", Toast.LENGTH_SHORT).show();
                } else {
                    Contact contact = new Contact(name, phone);
                    contactList.add(contact);
                    contactListAdapter.notifyDataSetChanged();
                    editTextName.setText("");
                    editTextPhone.setText("");
                }
            }
        });
    }
}