Android Studio实现通讯录项目完整代码

很抱歉，由于通讯录项目的代码比较长，无法在此一一列出。但是，我可以提供一些实现通讯录项目的基本步骤和关键代码片段：

1. 创建联系人实体类（Contact）

public class Contact {
    private String name;
    private String phoneNumber;
    private String email;

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

    // getters and setters
}

2. 创建数据库帮助类（DatabaseHelper）

public class DatabaseHelper extends SQLiteOpenHelper {
    private static final String DATABASE_NAME = "contacts.db";
    private static final int DATABASE_VERSION = 1;

    private static final String CREATE_CONTACTS_TABLE = "CREATE TABLE " + ContactContract.ContactEntry.TABLE_NAME + " ("
            + ContactContract.ContactEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
            + ContactContract.ContactEntry.COLUMN_NAME + " TEXT NOT NULL, "
            + ContactContract.ContactEntry.COLUMN_PHONE_NUMBER + " TEXT NOT NULL, "
            + ContactContract.ContactEntry.COLUMN_EMAIL + " TEXT);";

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase sqLiteDatabase) {
        sqLiteDatabase.execSQL(CREATE_CONTACTS_TABLE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
        sqLiteDatabase.execSQL("DROP TABLE IF EXISTS " + ContactContract.ContactEntry.TABLE_NAME);
        onCreate(sqLiteDatabase);
    }
}

3. 创建联系人数据表契约类（ContactContract）

public class ContactContract {
    public static final class ContactEntry implements BaseColumns {
        public static final String TABLE_NAME = "contacts";
        public static final String COLUMN_NAME = "name";
        public static final String COLUMN_PHONE_NUMBER = "phone_number";
        public static final String COLUMN_EMAIL = "email";
    }
}

4. 创建添加联系人界面（AddContactActivity）

public class AddContactActivity extends AppCompatActivity {
    private EditText etName;
    private EditText etPhoneNumber;
    private EditText etEmail;

    private DatabaseHelper databaseHelper;

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

        etName = findViewById(R.id.et_name);
        etPhoneNumber = findViewById(R.id.et_phone_number);
        etEmail = findViewById(R.id.et_email);

        databaseHelper = new DatabaseHelper(this);
    }

    public void onSaveButtonClick(View view) {
        String name = etName.getText().toString();
        String phoneNumber = etPhoneNumber.getText().toString();
        String email = etEmail.getText().toString();

        if (TextUtils.isEmpty(name) || TextUtils.isEmpty(phoneNumber)) {
            Toast.makeText(this, "Name and phone number are required", Toast.LENGTH_SHORT).show();
            return;
        }

        Contact contact = new Contact(name, phoneNumber, email);
        long result = databaseHelper.insertContact(contact);

        if (result == -1) {
            Toast.makeText(this, "Failed to save contact", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(this, "Contact saved", Toast.LENGTH_SHORT).show();
            finish();
        }
    }
}

5. 创建显示联系人列表界面（ContactListActivity）

public class ContactListActivity extends AppCompatActivity {
    private ListView listView;

    private DatabaseHelper databaseHelper;
    private List<Contact> contactList;

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

        listView = findViewById(R.id.list_view);

        databaseHelper = new DatabaseHelper(this);
        contactList = databaseHelper.getAllContacts();

        ContactListAdapter adapter = new ContactListAdapter(this, contactList);
        listView.setAdapter(adapter);
    }
}

6. 创建联系人列表适配器（ContactListAdapter）

public class ContactListAdapter extends ArrayAdapter<Contact> {
    private Context context;
    private List<Contact> contactList;

    public ContactListAdapter(Context context, List<Contact> contactList) {
        super(context, R.layout.item_contact, contactList);
        this.context = context;
        this.contactList = contactList;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = convertView;

        if (view == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.item_contact, null);
        }

        Contact contact = contactList.get(position);

        TextView tvName = view.findViewById(R.id.tv_name);
        TextView tvPhoneNumber = view.findViewById(R.id.tv_phone_number);

        tvName.setText(contact.getName());
        tvPhoneNumber.setText(contact.getPhoneNumber());

        return view;
    }
}

7. 在数据库帮助类中添加插入联系人和获取所有联系人的方法

public long insertContact(Contact contact) {
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(ContactContract.ContactEntry.COLUMN_NAME, contact.getName());
    values.put(ContactContract.ContactEntry.COLUMN_PHONE_NUMBER, contact.getPhoneNumber());
    values.put(ContactContract.ContactEntry.COLUMN_EMAIL, contact.getEmail());

    long result = db.insert(ContactContract.ContactEntry.TABLE_NAME, null, values);
    db.close();

    return result;
}

public List<Contact> getAllContacts() {
    List<Contact> contactList = new ArrayList<>();

    String selectQuery = "SELECT * FROM " + ContactContract.ContactEntry.TABLE_NAME;

    SQLiteDatabase db = this.getWritableDatabase();
    Cursor cursor = db.rawQuery(selectQuery, null);

    if (cursor.moveToFirst()) {
        do {
            String name = cursor.getString(cursor.getColumnIndex(ContactContract.ContactEntry.COLUMN_NAME));
            String phoneNumber = cursor.getString(cursor.getColumnIndex(ContactContract.ContactEntry.COLUMN_PHONE_NUMBER));
            String email = cursor.getString(cursor.getColumnIndex(ContactContract.ContactEntry.COLUMN_EMAIL));
            Contact contact = new Contact(name, phoneNumber, email);
            contactList.add(contact);
        } while (cursor.moveToNext());
    }

    cursor.close();
    db.close();

    return contactList;
}

以上就是Android Studio实现通讯录项目的基本步骤和关键代码片段。