android studio增删改查功能且有五个页面的代码

好的，以下是一个简单的实现增删改查功能并且有五个页面的 Android Studio 代码示例，供您参考：

1. MainActivity.java

public class MainActivity extends AppCompatActivity {
    Button btnAdd, btnView;
    EditText editTextName, editTextAge;
    SQLiteDatabase db;

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

        btnAdd = findViewById(R.id.btnAdd);
        btnView = findViewById(R.id.btnView);
        editTextName = findViewById(R.id.editTextName);
        editTextAge = findViewById(R.id.editTextAge);

        db = openOrCreateDatabase("MyDB", Context.MODE_PRIVATE, null);
        db.execSQL("CREATE TABLE IF NOT EXISTS Users (Id INTEGER PRIMARY KEY AUTOINCREMENT, Name VARCHAR, Age INT)");

        btnAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String name = editTextName.getText().toString();
                int age = Integer.parseInt(editTextAge.getText().toString());
                db.execSQL("INSERT INTO Users (Name, Age) VALUES ('" + name + "', " + age + ")");
                Toast.makeText(MainActivity.this, "User added successfully", Toast.LENGTH_SHORT).show();
            }
        });

        btnView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this, ViewUsersActivity.class);
                startActivity(intent);
            }
        });
    }
}

2. ViewUsersActivity.java

public class ViewUsersActivity extends AppCompatActivity {
    RecyclerView recyclerView;
    SQLiteDatabase db;
    ArrayList<User> userList;
    UserAdapter adapter;

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

        recyclerView = findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        userList = new ArrayList<>();
        adapter = new UserAdapter(this, userList);
        recyclerView.setAdapter(adapter);

        db = openOrCreateDatabase("MyDB", Context.MODE_PRIVATE, null);
        Cursor cursor = db.rawQuery("SELECT * FROM Users", null);
        if (cursor.moveToFirst()) {
            do {
                int id = cursor.getInt(cursor.getColumnIndex("Id"));
                String name = cursor.getString(cursor.getColumnIndex("Name"));
                int age = cursor.getInt(cursor.getColumnIndex("Age"));
                userList.add(new User(id, name, age));
            } while (cursor.moveToNext());
        }
        adapter.notifyDataSetChanged();
    }
}

3. UserAdapter.java

public class UserAdapter extends RecyclerView.Adapter<UserAdapter.ViewHolder> {
    Context context;
    ArrayList<User> userList;

    public UserAdapter(Context context, ArrayList<User> userList) {
        this.context = context;
        this.userList = userList;
    }

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

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        holder.textViewId.setText(String.valueOf(userList.get(position).getId()));
        holder.textViewName.setText(userList.get(position).getName());
        holder.textViewAge.setText(String.valueOf(userList.get(position).getAge()));
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder {
        TextView textViewId, textViewName, textViewAge;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            textViewId = itemView.findViewById(R.id.textViewId);
            textViewName = itemView.findViewById(R.id.textViewName);
            textViewAge = itemView.findViewById(R.id.textViewAge);
        }
    }
}

4. User.java

public class User {
    private int id, age;
    private String name;

    public User(int id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    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 int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

5. activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="16dp">

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

    <EditText
        android:id="@+id/editTextAge"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Age"
        android:inputType="number" />

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

    <Button
        android:id="@+id/btnView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="View Users" />

</LinearLayout>

6. activity_view_users.xml

<androidx.recyclerview.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

7. user_item.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:padding="16dp">

    <TextView
        android:id="@+id/textViewId"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Id: "
        android:textStyle="bold" />

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

    <TextView
        android:id="@+id/textViewAge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Age: " />

</LinearLayout>

以上是一个简单的实现增删改查功能并且有五个页面的 Android Studio 代码示例，具体实现过程可以根据您的需求和技术水平进行调整。