实现fragment切换无需重载

删除无用布局

mobile/src/main/java/cn/garymb/ygomobile/ui/home/HomeActivity.java

@@ -7,9 +7,12 @@ import android.os.Handler;
 import android.view.Gravity;
 import android.view.Menu;
 import android.view.MenuItem;
+import android.widget.FrameLayout;
 import android.widget.Toast;
 
 import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentTransaction;
 import androidx.navigation.ui.AppBarConfiguration;
 
 import com.ashokvarma.bottomnavigation.BottomNavigationBar;
@@ -45,6 +48,11 @@ public abstract class HomeActivity extends BaseActivity implements OnDuelAssista
 
     long exitLasttime = 0;
 
+    private BottomNavigationBar bottomNavigationBar;
+    private FrameLayout frameLayout;
+    private FragmentTransaction transaction;
+    private Fragment mFragment;
+
     private HomeFragment fragment_home;
     private CardSearchFragment fragment_search;
     private DeckManagerFragment fragment_deck_cards;
@@ -93,8 +101,9 @@ public abstract class HomeActivity extends BaseActivity implements OnDuelAssista
     }
 
     private void initBottomNavigationBar() {
+        frameLayout = (FrameLayout) findViewById(R.id.fragment_content);
         // 获取页面上的底部导航栏控件
-        BottomNavigationBar bottomNavigationBar = (BottomNavigationBar) findViewById(R.id.bottom_navigation_bar);
+        bottomNavigationBar = (BottomNavigationBar) findViewById(R.id.bottom_navigation_bar);
         bottomNavigationBar
                 .addItem(new BottomNavigationItem(R.drawable.ic_home, R.string.mc_home))
                 .addItem(new BottomNavigationItem(R.drawable.ic_search, R.string.search))
@@ -104,11 +113,27 @@ public abstract class HomeActivity extends BaseActivity implements OnDuelAssista
                 .setActiveColor(R.color.holo_blue_bright)
                 .setBarBackgroundColor(R.color.transparent)
                 .setMode(BottomNavigationBar.MODE_FIXED)
+                .setFirstSelectedPosition(0)
                 .initialise();//所有的设置需在调用该方法前完成
         bottomNavigationBar.setTabSelectedListener(new BottomNavigationBar.OnTabSelectedListener() {
             @Override
             public void onTabSelected(int position) {
-                //未选中->选中
+                switch (position) {
+                    case 0:
+                        switchFragment(fragment_home);
+                        break;
+                    case 1:
+                        switchFragment(fragment_search);
+                        break;
+                    case 2:
+                        switchFragment(fragment_deck_cards);
+                        break;
+                    case 3:
+                        switchFragment(fragment_mycard);
+                        break;
+                    case 4:
+                        break;
+                }
             }
 
             @Override
@@ -125,16 +150,29 @@ public abstract class HomeActivity extends BaseActivity implements OnDuelAssista
         fragment_search = new CardSearchFragment();
         fragment_deck_cards = new DeckManagerFragment();
         fragment_mycard = new MycardFragment();
+        mFragment = fragment_home;
         getSupportFragmentManager().beginTransaction()
-                .add(R.id.fragment_home, fragment_home)
-                .add(R.id.fragment_search, fragment_search)
-                .add(R.id.fragment_deck_cards, fragment_deck_cards)
-                .add(R.id.fragment_mycard, fragment_mycard)
-                //.add(R.id.fragment_settings,new Fragment())
+                .add(R.id.fragment_content, fragment_home)
                 .commit();
         getSupportActionBar().hide();
     }
 
+    private void switchFragment(Fragment fragment) {
+        //判断当前显示的Fragment是不是切换的Fragment
+        if (mFragment != fragment) {
+            //判断切换的Fragment是否已经添加过
+            if (!fragment.isAdded()) {
+                //如果没有，则先把当前的Fragment隐藏，把切换的Fragment添加上
+                getSupportFragmentManager().beginTransaction().hide(mFragment)
+                        .add(R.id.fragment_content, fragment).commit();
+            } else {
+                //如果已经添加过，则先把当前的Fragment隐藏，把切换的Fragment显示出来
+                getSupportFragmentManager().beginTransaction().hide(mFragment).show(fragment).commit();
+            }
+            mFragment = fragment;
+        }
+    }
+
     @Override
     protected void onResume() {
         super.onResume();
@@ -217,12 +255,6 @@ public abstract class HomeActivity extends BaseActivity implements OnDuelAssista
         duelAssistantManagement.removeDuelAssistantListener(this);
     }
 
-    @Override
-    public boolean onCreateOptionsMenu(Menu menu) {
-        getMenuInflater().inflate(R.menu.main, menu);
-        return true;
-    }
-
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         return super.onOptionsItemSelected(item);

mobile/src/main/java/cn/garymb/ygomobile/ui/home/HomeFragment.java

@@ -512,8 +512,6 @@ public class HomeFragment extends BaseFragemnt implements View.OnClickListener {
     @Override
     public void onClick(View v) {
         switch (v.getId()) {
-            case R.id.action_about:
-                break;
             case R.id.action_game:
                 setRandomCardDetail();
                 if (mCardDetailRandom != null) {
@@ -527,11 +525,6 @@ public class HomeFragment extends BaseFragemnt implements View.OnClickListener {
             case R.id.action_bot:
                 YGOStarter.startGame(getActivity(), null, "-k", "-s");
                 break;
-            case R.id.action_settings: {
-                Intent intent = new Intent(getContext(), SettingsActivity.class);
-                startActivity(intent);
-                break;
-            }
             case R.id.action_download_ex:
                 WebActivity.open(getContext(), getString(R.string.action_download_expansions), Constants.URL_YGO233_ADVANCE);
                 break;

mobile/src/main/res/layout/activity_home.xml

@@ -7,9 +7,16 @@
     android:fitsSystemWindows="true"
     app:layout_behavior="@string/appbar_scrolling_view_behavior">
 
+    <FrameLayout
+        android:id="@+id/fragment_content"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_weight="1">
+    </FrameLayout>
+
     <com.ashokvarma.bottomnavigation.BottomNavigationBar
         android:id="@+id/bottom_navigation_bar"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:layout_gravity="bottom"/>
+        android:layout_gravity="bottom" />
 </FrameLayout>
\ No newline at end of file

mobile/src/main/res/layout/nav_card_search.xml

@@ -17,10 +17,7 @@
         android:layout_marginTop="6dp"
         android:orientation="vertical">
 
-        <com.google.android.material.textfield.TextInputLayout
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginLeft="18dp" />
+        
 
         <LinearLayout
             android:layout_width="match_parent"

mobile/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"
-    xmlns:app="http://schemas.android.com/apk/res-auto">
-    <item
-        android:id="@+id/home_fragment"
-        android:icon="@drawable/start"
-        android:title="@string/mc_home"
-        app:showAsAction="always" />
-    <item
-        android:id="@+id/cardSearcher_fragment"
-        android:icon="@drawable/search"
-        android:title="@string/search"
-        app:showAsAction="always" />
-    <item
-        android:id="@+id/deckManager_fragment"
-        android:icon="@drawable/deck"
-        android:title="@string/deck_manager"
-        app:showAsAction="always" />
-    <item
-        android:id="@+id/mycard_fragment"
-        android:icon="@drawable/mycard"
-        android:title="@string/mycard"
-        app:showAsAction="always" />
-    <item
-        android:id="@+id/setting_fragment"
-        android:icon="@drawable/setting"
-        android:title="@string/settings"
-        app:showAsAction="always" />
-</menu>
\ No newline at end of file

mobile/src/main/res/menu/card_search2.xml

-<?xml version="1.0" encoding="utf-8"?>
-<menu xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto">
-    <item
-        android:id="@+id/action_search"
-        android:icon="@drawable/search"
-        android:title="@string/search"
-        app:showAsAction="always" />
-
-</menu>
\ No newline at end of file

mobile/src/main/res/menu/main.xml

-<?xml version="1.0" encoding="utf-8"?>
-<menu xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto">
-    <item
-        android:id="@+id/action_game"
-        android:icon="@drawable/start"
-        android:title="@string/action_game"
-        app:showAsAction="always" />
-    <item
-        android:id="@+id/action_card_search"
-        android:icon="@drawable/search"
-        android:title="@string/card_search"
-        app:showAsAction="always" />
-    <item
-        android:id="@+id/action_deck_manager"
-        android:icon="@drawable/deck"
-        android:title="@string/deck_manager"
-        app:showAsAction="always" />
-</menu>
\ No newline at end of file

mobile/src/main/res/menu/nav_main_menu.xml

-<?xml version="1.0" encoding="utf-8"?>
-<menu xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto">
-    <item
-        android:id="@+id/action_deck_manager"
-        android:icon="@drawable/ic_edit"
-        android:title="@string/deck_manager" />
-    <item
-        android:id="@+id/action_download_ex"
-        android:icon="@drawable/ic_add"
-        android:title="@string/action_add_server" />
-    <item
-        android:id="@+id/action_join_qq_group"
-        android:icon="@drawable/ic_home_black"
-        android:title="@string/mycard" />
-    <item
-        android:id="@+id/action_reset_game_res"
-        android:icon="@drawable/ic_file_download_black_24dp"
-        android:title="@string/reset_game_res" />
-    <item
-        android:id="@+id/action_replay"
-        android:icon="@drawable/ic_album"
-        android:title="@string/replay" />
-    <item
-        android:id="@+id/action_bot"
-        android:icon="@drawable/ic_copy"
-        android:title="@string/bot_mode" />
-
-    <item android:title="@string/menu">
-        <menu>
-            <item
-                android:id="@+id/action_settings"
-                android:icon="@drawable/ic_settings"
-                android:title="@string/action_settings" />
-            <item
-                android:id="@+id/action_help"
-                android:icon="@drawable/ic_live_help"
-                android:title="@string/help" />
-            <item
-                android:id="@+id/action_about"
-                android:icon="@drawable/ic_about"
-                android:title="@string/action_about" />
-
-            <item
-                android:id="@+id/action_quit"
-                android:icon="@drawable/ic_close_black_24dp"
-                android:title="@string/quit" />
-        </menu>
-    </item>
-</menu>
\ No newline at end of file

mobile/src/main/res/navigation/mobile_navigation.xml

-<?xml version="1.0" encoding="utf-8"?>
-<navigation xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:id="@+id/mobile_navigation"
-    app:startDestination="@+id/home_fragment">
-
-    <fragment
-        android:id="@+id/home_fragment"
-        android:name="cn.garymb.ygomobile.ui.home.HomeFragment"
-        tools:layout="@layout/fragment_home" />
-    <fragment
-        android:id="@+id/cardSearcher_fragment"
-        android:name="cn.garymb.ygomobile.ui.cards.CardSearchFragment"
-        tools:layout="@layout/fragment_search"/>
-    <fragment
-        android:id="@+id/deckManager_fragment"
-        android:name="cn.garymb.ygomobile.ui.cards.DeckManagerFragment"
-        tools:layout="@layout/fragment_deck_cards"/>
-    <fragment
-        android:id="@+id/mycard_fragment"
-        android:name="cn.garymb.ygomobile.ui.mycard.MycardFragment"
-        tools:layout="@layout/fragment_mycard" />
-    <fragment
-        android:id="@+id/setting_fragment"
-        android:name="cn.garymb.ygomobile.ui.preference.fragments.SettingFragment"
-        tools:layout="@layout/fragment_settings" />
-
-</navigation>
\ No newline at end of file