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app/src/main/java/top/iletter/lvnote/FragmentHome.java

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+package top.iletter.lvnote;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.viewpager2.widget.ViewPager2;
+
+import com.google.android.material.tabs.TabLayout;
+
+public class FragmentHome extends Fragment {
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        return inflater.inflate(R.layout.fragment_home, container, false);
+    }
+
+    @Override
+    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+
+        TabLayout tabLayout = view.findViewById(R.id.tab_layout);
+        ViewPager2 viewPager = view.findViewById(R.id.view_pager);
+
+        // 设置三标签：看过/正在看/准备看
+        tabLayout.addTab(tabLayout.newTab().setText("看过"));
+        tabLayout.addTab(tabLayout.newTab().setText("正在看"));
+        tabLayout.addTab(tabLayout.newTab().setText("准备看"));
+
+        // TODO: 后续实现 ViewPager2 适配器
+    }
+}

app/src/main/java/top/iletter/lvnote/FragmentProfile.java

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+package top.iletter.lvnote;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+
+public class FragmentProfile extends Fragment {
+
+    // ⚠️ 必须有无参构造函数！
+    public FragmentProfile() {
+        // Required empty public constructor
+    }
+
+    @Nullable
+    @Override
+    public View onCreateView(@NonNull LayoutInflater inflater,
+                             @Nullable ViewGroup container,
+                             @Nullable Bundle savedInstanceState) {
+        return inflater.inflate(R.layout.fragment_profile, container, false);
+    }
+
+    @Override
+    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+
+        // 安全地操作 View
+        TextView movieCount = view.findViewById(R.id.tv_movie_count);
+        TextView bookCount = view.findViewById(R.id.tv_book_count);
+
+        if (movieCount != null) movieCount.setText("24");
+        if (bookCount != null) bookCount.setText("18");
+    }
+}

app/src/main/java/top/iletter/lvnote/MainActivity.java

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+package top.iletter.lvnote;
+
+import android.os.Bundle;
+import android.widget.Toast;
+
+import androidx.activity.EdgeToEdge;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.graphics.Insets;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.WindowInsetsCompat;
+import androidx.fragment.app.Fragment;
+
+import com.google.android.material.bottomappbar.BottomAppBar;
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+
+import android.os.Bundle;
+import android.view.View;
+import android.widget.ImageButton;
+import android.widget.Toast;
+
+public class MainActivity extends AppCompatActivity {
+    private FragmentHome homeFragment = new FragmentHome();
+    private FragmentProfile profileFragment = new FragmentProfile();
+    private Fragment currentFragment = homeFragment;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        // 初始化默认显示主页
+        if (savedInstanceState == null) {
+            getSupportFragmentManager().beginTransaction()
+                    .replace(R.id.fragment_container, homeFragment)
+                    .commit();
+        }
+
+        // 左按钮：主页
+        ImageButton btnHome = findViewById(R.id.btn_home);
+        btnHome.setOnClickListener(v -> switchFragment(homeFragment));
+
+        // 右按钮：我的
+        ImageButton btnProfile = findViewById(R.id.btn_profile);
+        btnProfile.setOnClickListener(v -> switchFragment(profileFragment));
+
+        // 中间按钮：添加
+        FloatingActionButton fabAdd = findViewById(R.id.fab_add);
+        fabAdd.setOnClickListener(v -> {
+            // TODO: 跳转到新增页面
+            Toast.makeText(this, "点击了添加按钮", Toast.LENGTH_SHORT).show();
+        });
+    }
+
+    private void switchFragment(Fragment targetFragment) {
+        if (currentFragment != targetFragment) {
+            getSupportFragmentManager().beginTransaction()
+                    .setCustomAnimations(
+                            android.R.anim.fade_in,
+                            android.R.anim.fade_out,
+                            android.R.anim.fade_in,
+                            android.R.anim.fade_out
+                    )
+                    .replace(R.id.fragment_container, targetFragment)
+                    .commit();
+            currentFragment = targetFragment;
+        }
+    }
+}