代码android studio 通讯录

以下是一个简单的Android Studio通讯录代码示例，包括添加联系人、修改联系人、删除联系人和查询联系人等功能：

// 添加联系人
public void addContact(String name, String phone, String email) {
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues values = new ContentValues();
    values.put(KEY_NAME, name);
    values.put(KEY_PHONE, phone);
    values.put(KEY_EMAIL, email);
    db.insert(TABLE_CONTACTS, null, values);
    db.close();
}

// 修改联系人
public int updateContact(Contact contact) {
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues values = new ContentValues();
    values.put(KEY_NAME, contact.getName());
    values.put(KEY_PHONE, contact.getPhoneNumber());
    values.put(KEY_EMAIL, contact.getEmail());
    return db.update(TABLE_CONTACTS, values, KEY_ID + " = ?",
            new String[] { String.valueOf(contact.getID()) });
}

// 删除联系人
public void deleteContact(Contact contact) {
    SQLiteDatabase db = this.getWritableDatabase();
    db.delete(TABLE_CONTACTS, KEY_ID + " = ?",
            new String[] { String.valueOf(contact.getID()) });
    db.close();
}

// 查询联系人
public Contact getContact(int id) {
    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.query(TABLE_CONTACTS, new String[] { KEY_ID,
            KEY_NAME, KEY_PHONE, KEY_EMAIL }, KEY_ID + "=?",
            new String[] { String.valueOf(id) }, null, null, null, null);
    if (cursor != null)
        cursor.moveToFirst();
    Contact contact = new Contact(Integer.parseInt(cursor.getString(0)),
            cursor.getString(1), cursor.getString(2), cursor.getString(3));
    return contact;
}