环渤海-页面交互

app/src/main/java/com/example/merchanthbh/ui/Home/HomeActivity.java

@@ -2,19 +2,54 @@ package com.example.merchanthbh.ui.Home;
 
 import android.content.Intent;
 import android.os.Bundle;
+import android.view.MenuItem;
 import android.view.View;
 import android.widget.Button;
 
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentTransaction;
 
 import com.example.merchanthbh.R;
+import com.example.merchanthbh.ui.mine.MineFragment;
+import com.google.android.material.bottomnavigation.BottomNavigationView;
 
 public class HomeActivity extends AppCompatActivity {
+    private HomeFragment homeFragment;
+    private BottomNavigationView bottomNavigationView;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_home);
+        // 初始化底部导航栏
+        bottomNavigationView = findViewById(R.id.bottom_navigation_view);
+        bottomNavigationView.setOnNavigationItemSelectedListener(navItemSelectedListener);
 
+        // 显示默认的 Fragment
+        getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, new HomeFragment()).commit();
+    }
+
+    private BottomNavigationView.OnNavigationItemSelectedListener navItemSelectedListener = item -> {
+        Fragment selectedFragment = null;
+
+        // 根据选项 ID 创建相应的 Fragment
+        switch (item.getItemId()) {
+            case R.id.menu_home:
+                selectedFragment = new HomeFragment();
+                break;
+            case R.id.menu_mine:
+                selectedFragment = new MineFragment();
+                break;
+            default:
+        }
+
+        // 替换当前显示的 Fragment
+        getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, selectedFragment).commit();
+
+        return true;
+    };
     }
 
 }

app/src/main/java/com/example/merchanthbh/ui/Home/HomeFragment.java

+package com.example.merchanthbh.ui.Home;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.fragment.app.Fragment;
+
+import com.example.merchanthbh.R;
+
+public class HomeFragment extends Fragment {
+    public HomeFragment() {
+        // 空的构造函数
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        // 加载 Fragment 的布局文件，并返回对应的 View 对象
+        return inflater.inflate(R.layout.fragment_home, container, false);
+    }
+}

app/src/main/java/com/example/merchanthbh/ui/mine/MineFragment.java

+package com.example.merchanthbh.ui.mine;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.fragment.app.Fragment;
+
+import com.example.merchanthbh.R;
+
+public class MineFragment extends Fragment {
+    public MineFragment() {
+        // 空的构造函数
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        // 加载 Fragment 的布局文件，并返回对应的 View 对象
+        return inflater.inflate(R.layout.fragment_mine, container, false);
+    }
+}
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app/src/main/res/layout/activity_mine.xml

@@ -22,7 +22,7 @@
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:background="@color/bg_grey"
-            app:layout_constraintTop_toBottomOf="@+id/bar">
+            tools:ignore="MissingConstraints">
 
             <LinearLayout
                 android:layout_width="match_parent"

app/src/main/res/menu/bottom_nav_menu.xml

+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:id="@+id/menu_home"
+        android:icon="@mipmap/tab_icon_home_selected"
+        android:title="首页" />
+    <item
+        android:id="@+id/menu_huanbohai"
+        android:icon="@mipmap/tab_icon_huanbohai_default"
+        android:title="环渤海" />
+    <item
+        android:id="@+id/menu_mine"
+        android:icon="@mipmap/tab_icon_wode_default"
+        android:title="我的" />
+</menu>
\ No newline at end of file