利用SQLite数据库相关知识，制作一个简易的通讯录，将界面需要的图片导入drawable文件夹中，在MainActivity中编写逻辑代码，实现联系人信息的添加、查询、修改以及删除功能。

好的，这是一个技术问题，我可以回答。首先，需要创建一个SQLite数据库来存储联系人信息，可以使用Android内置的SQLiteOpenHelper类来创建和管理数据库。然后，需要在界面中添加相应的输入框和按钮来实现联系人信息的添加、查询、修改和删除功能，并在MainActivity中编写逻辑代码来处理用户的操作。具体实现细节可以参考相关的Android开发教程和示例代码。

相关问题

用android studio,点击按钮可以在Dairy数据库中查看所有记录并显示在listview中，写出SQLite数据库创建和功能实现的完整过程

好的，下面是SQLite数据库创建和功能实现的完整过程：

1. 在 Android Studio 中创建一个新项目，并在项目的 `app/build.gradle` 文件中添加以下依赖项：

dependencies {
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.recyclerview:recyclerview:1.2.0'
    implementation 'androidx.cardview:cardview:1.0.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
    implementation 'androidx.room:room-runtime:2.3.0'
    annotationProcessor 'androidx.room:room-compiler:2.3.0'
}

2. 创建一个名为 `Diary` 的类，并使用 `@Entity` 注释将其标记为 Room 数据库表。

@Entity(tableName = "diary_table")
public class Diary {
    @PrimaryKey(autoGenerate = true)
    private int id;
    private String title;
    private String content;
    private String date;

    public Diary(String title, String content, String date) {
        this.title = title;
        this.content = content;
        this.date = date;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }
}

3. 创建一个名为 `DiaryDao` 的接口，并使用 `@Dao` 注释将其标记为 Room 数据库访问对象。

@Dao
public interface DiaryDao {
    @Insert
    void insert(Diary diary);

    @Update
    void update(Diary diary);

    @Delete
    void delete(Diary diary);

    @Query("DELETE FROM diary_table")
    void deleteAllDiaries();

    @Query("SELECT * FROM diary_table ORDER BY id DESC")
    LiveData<List<Diary>> getAllDiaries();
}

4. 创建一个名为 `DiaryDatabase` 的类，并扩展 `RoomDatabase` 类。在 `DiaryDatabase` 类中，创建一个名为 `diaryDao` 的抽象方法，该方法返回 `DiaryDao` 接口的实现。

@Database(entities = {Diary.class}, version = 1)
public abstract class DiaryDatabase extends RoomDatabase {
    private static DiaryDatabase instance;

    public abstract DiaryDao diaryDao();

    public static synchronized DiaryDatabase getInstance(Context context) {
        if (instance == null) {
            instance = Room.databaseBuilder(context.getApplicationContext(),
                    DiaryDatabase.class, "diary_database")
                    .fallbackToDestructiveMigration()
                    .build();
        }
        return instance;
    }
}

5. 在 MainActivity 类中，实例化 `DiaryViewModel` 类，并观察 `getAllDiaries()` 方法返回的 `LiveData` 对象，以便在数据库中添加，更新和删除数据时及时更新 UI。

public class MainActivity extends AppCompatActivity {
    private DiaryViewModel viewModel;
    private RecyclerView recyclerView;

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

        recyclerView = findViewById(R.id.recycler_view);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setHasFixedSize(true);

        final DiaryAdapter adapter = new DiaryAdapter();
        recyclerView.setAdapter(adapter);

        viewModel = new ViewModelProvider(this).get(DiaryViewModel.class);
        viewModel.getAllDiaries().observe(this, new Observer<List<Diary>>() {
            @Override
            public void onChanged(List<Diary> diaries) {
                adapter.submitList(diaries);
            }
        });
    }
}

6. 在 `MainActivity` 中实现添加、更新和删除数据的功能，以及在 `DiaryAdapter` 中实现 `ViewHolder` 和 `RecyclerView.Adapter` 的相关方法。

public class MainActivity extends AppCompatActivity {
    private DiaryViewModel viewModel;
    private RecyclerView recyclerView;

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

        recyclerView = findViewById(R.id.recycler_view);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setHasFixedSize(true);

        final DiaryAdapter adapter = new DiaryAdapter();
        recyclerView.setAdapter(adapter);

        viewModel = new ViewModelProvider(this).get(DiaryViewModel.class);
        viewModel.getAllDiaries().observe(this, new Observer<List<Diary>>() {
            @Override
            public void onChanged(List<Diary> diaries) {
                adapter.submitList(diaries);
            }
        });

        FloatingActionButton buttonAddDiary = findViewById(R.id.button_add_diary);
        buttonAddDiary.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, AddEditDiaryActivity.class);
                startActivityForResult(intent, ADD_DIARY_REQUEST);
            }
        });

        adapter.setOnItemClickListener(new DiaryAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(Diary diary) {
                Intent intent = new Intent(MainActivity.this, AddEditDiaryActivity.class);
                intent.putExtra(AddEditDiaryActivity.EXTRA_ID, diary.getId());
                intent.putExtra(AddEditDiaryActivity.EXTRA_TITLE, diary.getTitle());
                intent.putExtra(AddEditDiaryActivity.EXTRA_CONTENT, diary.getContent());
                intent.putExtra(AddEditDiaryActivity.EXTRA_DATE, diary.getDate());
                startActivityForResult(intent, EDIT_DIARY_REQUEST);
            }
        });
    }

    public static final int ADD_DIARY_REQUEST = 1;
    public static final int EDIT_DIARY_REQUEST = 2;

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == ADD_DIARY_REQUEST && resultCode == RESULT_OK) {
            String title = data.getStringExtra(AddEditDiaryActivity.EXTRA_TITLE);
            String content = data.getStringExtra(AddEditDiaryActivity.EXTRA_CONTENT);
            String date = data.getStringExtra(AddEditDiaryActivity.EXTRA_DATE);

            Diary diary = new Diary(title, content, date);
            viewModel.insert(diary);

            Toast.makeText(this, "Note saved", Toast.LENGTH_SHORT).show();
        } else if (requestCode == EDIT_DIARY_REQUEST && resultCode == RESULT_OK) {
            int id = data.getIntExtra(AddEditDiaryActivity.EXTRA_ID, -1);

            if (id == -1) {
                Toast.makeText(this, "Note can't be updated", Toast.LENGTH_SHORT).show();
                return;
            }

            String title = data.getStringExtra(AddEditDiaryActivity.EXTRA_TITLE);
            String content = data.getStringExtra(AddEditDiaryActivity.EXTRA_CONTENT);
            String date = data.getStringExtra(AddEditDiaryActivity.EXTRA_DATE);

            Diary diary = new Diary(title, content, date);
            diary.setId(id);
            viewModel.update(diary);

            Toast.makeText(this, "Note updated", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(this, "Note not saved", Toast.LENGTH_SHORT).show();
        }
    }
}

public class DiaryAdapter extends ListAdapter<Diary, DiaryAdapter.DiaryHolder> {
    private OnItemClickListener listener;

    public DiaryAdapter() {
        super(DIFF_CALLBACK);
    }

    private static final DiffUtil.ItemCallback<Diary> DIFF_CALLBACK = new DiffUtil.ItemCallback<Diary>() {
        @Override
        public boolean areItemsTheSame(@NonNull Diary oldItem, @NonNull Diary newItem) {
            return oldItem.getId() == newItem.getId();
        }

        @Override
        public boolean areContentsTheSame(@NonNull Diary oldItem, @NonNull Diary newItem) {
            return oldItem.getTitle().equals(newItem.getTitle()) &&
                    oldItem.getContent().equals(newItem.getContent()) &&
                    oldItem.getDate().equals(newItem.getDate());
        }
    };

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

    @Override
    public void onBindViewHolder(@NonNull DiaryHolder holder, int position) {
        Diary currentDiary = getItem(position);
        holder.textViewTitle.setText(currentDiary.getTitle());
        holder.textViewContent.setText(currentDiary.getContent());
        holder.textViewDate.setText(currentDiary.getDate());
    }

    public Diary getDiaryAt(int position) {
        return getItem(position);
    }

    class DiaryHolder extends RecyclerView.ViewHolder {
        private TextView textViewTitle;
        private TextView textViewContent;
        private TextView textViewDate;

        public DiaryHolder(View itemView) {
            super(itemView);
            textViewTitle = itemView.findViewById(R.id.text_view_title);
            textViewContent = itemView.findViewById(R.id.text_view_content);
            textViewDate = itemView.findViewById(R.id.text_view_date);

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int position = getAdapterPosition();
                    if (listener != null && position != RecyclerView.NO_POSITION) {
                        listener.onItemClick(getItem(position));
                    }
                }
            });
        }
    }

    public interface OnItemClickListener {
        void onItemClick(Diary diary);
    }

    public void setOnItemClickListener(OnItemClickListener listener) {
        this.listener = listener;
    }
}

7. 创建一个名为 `AddEditDiaryActivity` 的活动，并在其中实现添加和更新数据的功能。同时，将数据传递回 `MainActivity`。

public class AddEditDiaryActivity extends AppCompatActivity {
    public static final String EXTRA_ID = "com.example.diary.EXTRA_ID";
    public static final String EXTRA_TITLE = "com.example.diary.EXTRA_TITLE";
    public static final String EXTRA_CONTENT = "com.example.diary.EXTRA_CONTENT";
    public static final String EXTRA_DATE = "com.example.diary.EXTRA_DATE";

    private EditText editTextTitle;
    private EditText editTextContent;
    private TextView textViewDate;

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

        editTextTitle = findViewById(R.id.edit_text_title);
        editTextContent = findViewById(R.id.edit_text_content);
        textViewDate = findViewById(R.id.text_view_date);

        getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_close);

        Intent intent = getIntent();
        if (intent.hasExtra(EXTRA_ID)) {
            setTitle("Edit Note");
            editTextTitle.setText(intent.getStringExtra(EXTRA_TITLE));
            editTextContent.setText(intent.getStringExtra(EXTRA_CONTENT));
            textViewDate.setText(intent.getStringExtra(EXTRA_DATE));
        } else {
            setTitle("Add Note");
            textViewDate.setText(getCurrentDate());
        }
    }

    private String getCurrentDate() {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd HH:mm");
        return sdf.format(new Date());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.add_diary_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.save_diary:
                saveDiary();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    private void saveDiary() {
        String title = editTextTitle.getText().toString();
        String content = editTextContent.getText().toString();
        String date = textViewDate.getText().toString();

        if (title.trim().isEmpty() || content.trim().isEmpty()) {
            Toast.makeText(this, "Please insert a title and content", Toast.LENGTH_SHORT).show();
            return;
        }

        Intent data = new Intent();
        data.putExtra(EXTRA_TITLE, title);
        data.putExtra(EXTRA_CONTENT, content);
        data.putExtra(EXTRA_DATE, date);

        int id = getIntent().getIntExtra(EXTRA_ID, -1);
        if (id != -1) {
            data.putExtra(EXTRA_ID, id);
        }

        setResult(RESULT_OK, data);
        finish();
    }
}

这就是使用 SQLite 数据库在 Android Studio 中创建和实现功能的完整过程。

Android studio通讯录制作代码

好的，下面是一个简单的 Android Studio 通讯录制作代码示例，使用 SQLite 数据库来存储联系人信息：

1. 创建一个名为 "Contact" 的 Java 类，用于存储联系人信息。

public class Contact {
    private int id;
    private String name;
    private String phoneNumber;

    public Contact() {}

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

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPhoneNumber() {
        return phoneNumber;
    }

    public void setPhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }
}

2. 创建一个名为 "DatabaseHelper" 的 Java 类，用于管理 SQLite 数据库。

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

    private static final String TABLE_CONTACTS = "contacts";
    private static final String COLUMN_ID = "id";
    private static final String COLUMN_NAME = "name";
    private static final String COLUMN_PHONE = "phone_number";

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

    @Override
    public void onCreate(SQLiteDatabase db) {
        String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS +
                "(" + COLUMN_ID + " INTEGER PRIMARY KEY," +
                COLUMN_NAME + " TEXT," +
                COLUMN_PHONE + " TEXT" + ")";
        db.execSQL(CREATE_CONTACTS_TABLE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS);
        onCreate(db);
    }

    public void addContact(Contact contact) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(COLUMN_NAME, contact.getName());
        values.put(COLUMN_PHONE, contact.getPhoneNumber());
        db.insert(TABLE_CONTACTS, null, values);
        db.close();
    }

    public List<Contact> getAllContacts() {
        List<Contact> contactList = new ArrayList<>();
        String selectQuery = "SELECT * FROM " + TABLE_CONTACTS;
        SQLiteDatabase db = this.getWritableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);
        if (cursor.moveToFirst()) {
            do {
                Contact contact = new Contact();
                contact.setId(Integer.parseInt(cursor.getString(0)));
                contact.setName(cursor.getString(1));
                contact.setPhoneNumber(cursor.getString(2));
                contactList.add(contact);
            } while (cursor.moveToNext());
        }
        cursor.close();
        db.close();
        return contactList;
    }

    public void updateContact(Contact contact) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(COLUMN_NAME, contact.getName());
        values.put(COLUMN_PHONE, contact.getPhoneNumber());
        db.update(TABLE_CONTACTS, values, COLUMN_ID + " = ?",
                new String[] { String.valueOf(contact.getId()) });
        db.close();
    }

    public void deleteContact(Contact contact) {
        SQLiteDatabase db = this.getWritableDatabase();
        db.delete(TABLE_CONTACTS, COLUMN_ID + " = ?",
                new String[] { String.valueOf(contact.getId()) });
        db.close();
    }
}

3. 在布局文件中添加一个 RecyclerView 和一个 FloatingActionButton。

<android.support.v7.widget.RecyclerView
    android:id="@+id/recycler_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    android:layout_margin="16dp"
    android:src="@android:drawable/ic_input_add"/>

4. 在 MainActivity 类中实现 RecyclerView 和 FloatingActionButton 的逻辑。

public class MainActivity extends AppCompatActivity {
    private List<Contact> contactList = new ArrayList<>();
    private RecyclerView recyclerView;
    private ContactAdapter adapter;
    private DatabaseHelper db;

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

        recyclerView = findViewById(R.id.recycler_view);
        adapter = new ContactAdapter(contactList);
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setItemAnimator(new DefaultItemAnimator());
        recyclerView.setAdapter(adapter);

        db = new DatabaseHelper(this);
        contactList.addAll(db.getAllContacts());
        adapter.notifyDataSetChanged();

        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this, AddContactActivity.class);
                startActivityForResult(intent, 1);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == 1) {
            if (resultCode == RESULT_OK) {
                Contact contact = (Contact) data.getSerializableExtra("contact");
                db.addContact(contact);
                contactList.clear();
                contactList.addAll(db.getAllContacts());
                adapter.notifyDataSetChanged();
            }
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        db.close();
    }
}

5. 在 AddContactActivity 类中实现添加联系人的逻辑。

public class AddContactActivity extends AppCompatActivity {
    private EditText inputName;
    private EditText inputPhoneNumber;

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

        inputName = findViewById(R.id.input_name);
        inputPhoneNumber = findViewById(R.id.input_phone_number);

        Button btnSave = findViewById(R.id.btn_save);
        btnSave.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String name = inputName.getText().toString();
                String phoneNumber = inputPhoneNumber.getText().toString();
                if (!name.isEmpty() && !phoneNumber.isEmpty()) {
                    Contact contact = new Contact();
                    contact.setName(name);
                    contact.setPhoneNumber(phoneNumber);
                    Intent intent = new Intent();
                    intent.putExtra("contact", contact);
                    setResult(RESULT_OK, intent);
                    finish();
                }
            }
        });
    }
}

这样一个简单的 Android Studio 通讯录制作代码就完成了。当用户点击 FloatingActionButton 时，将跳转到 AddContactActivity 界面，用户可以输入联系人的姓名和电话号码，并保存到 SQLite 数据库中。在 MainActivity 中使用 RecyclerView 显示所有保存的联系人信息。