重复点击底部导航后刷新界面

app/src/main/java/cn/yunliyunwai/beyondclouds/MainActivity.java

@@ -23,10 +23,11 @@ import cn.yunliyunwai.beyondclouds.ui.HomeFragment;
 import cn.yunliyunwai.beyondclouds.ui.MyFragment;
 import cn.yunliyunwai.beyondclouds.ui.ProjectFragment;
 import cn.yunliyunwai.beyondclouds.ui.QAFragment;
+import cn.yunliyunwai.beyondclouds.ui.listener.OnNavigationReselectedListener;
 import cn.yunliyunwai.beyondclouds.util.StatusBarUtils;
 import cn.yunliyunwai.beyondclouds.viewmodel.MainActivityViewModel;
 
-public class MainActivity extends BaseActivity<MainActivityViewModel, ActivityMainBinding> implements BottomNavigationView.OnNavigationItemSelectedListener {
+public class MainActivity extends BaseActivity<MainActivityViewModel, ActivityMainBinding> implements BottomNavigationView.OnNavigationItemSelectedListener, BottomNavigationView.OnNavigationItemReselectedListener {
 
     private static final String TAG = MainActivity.class.getCanonicalName();
     private List<Fragment> fragments;
@@ -75,6 +76,7 @@ public class MainActivity extends BaseActivity<MainActivityViewModel, ActivityMa
 
 
         binding.bottomNavigationView.setOnNavigationItemSelectedListener(this);
+        binding.bottomNavigationView.setOnNavigationItemReselectedListener(this);
         binding.bottomNavigationView.setItemIconTintList(null);
     }
 
@@ -100,6 +102,34 @@ public class MainActivity extends BaseActivity<MainActivityViewModel, ActivityMa
         return true;
     }
 
+    @Override
+    public void onNavigationItemReselected(@NonNull MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.home_fragment:
+                dispatchReSelectEvent(0);
+                break;
+            case R.id.project_fragment:
+                dispatchReSelectEvent(1);
+                break;
+            case R.id.dynamic_fragment:
+                dispatchReSelectEvent(2);
+                break;
+            case R.id.qa_fragment:
+                dispatchReSelectEvent(3);
+                break;
+            case R.id.my_fragment:
+                dispatchReSelectEvent(4);
+                break;
+        }
+    }
+
+    private void dispatchReSelectEvent(int index) {
+        Fragment fragment = fragments.get(index);
+        if (fragment instanceof OnNavigationReselectedListener) {
+            ((OnNavigationReselectedListener) fragment).onNavigationReselected();
+        }
+    }
+
     private void switchFragment(int index) {
         int previousIndex = binding.getViewModel().getCurrentIndex();
         FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

app/src/main/java/cn/yunliyunwai/beyondclouds/adapter/common/CategoryFragmentPagerAdapter.java

 package cn.yunliyunwai.beyondclouds.adapter.common;
 
 import android.os.Bundle;
+import android.view.ViewGroup;
 
 import androidx.annotation.NonNull;
 import androidx.fragment.app.Fragment;
@@ -15,6 +16,7 @@ import cn.yunliyunwai.beyondclouds.ui.common.FragmentFactory;
 public class CategoryFragmentPagerAdapter extends FragmentStatePagerAdapter {
     private List<CommonCategory> categories;
     private FragmentFactory factory;
+    private Fragment currentFragment;
 
     public CategoryFragmentPagerAdapter(@NonNull FragmentManager fm, List<CommonCategory> categories, FragmentFactory factory) {
         super(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
@@ -33,7 +35,17 @@ public class CategoryFragmentPagerAdapter extends FragmentStatePagerAdapter {
     }
 
     @Override
+    public void setPrimaryItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
+        super.setPrimaryItem(container, position, object);
+        currentFragment = (Fragment) object;
+    }
+
+    @Override
     public int getCount() {
         return categories.size();
     }
+
+    public Fragment getCurrentFragment() {
+        return currentFragment;
+    }
 }

app/src/main/java/cn/yunliyunwai/beyondclouds/ui/DynamicFragment.java

@@ -22,13 +22,14 @@ import cn.yunliyunwai.beyondclouds.data.model.Post;
 import cn.yunliyunwai.beyondclouds.databinding.FragmentDynamicBinding;
 import cn.yunliyunwai.beyondclouds.ui.common.FragmentFactory;
 import cn.yunliyunwai.beyondclouds.ui.common.RefreshableFragment;
+import cn.yunliyunwai.beyondclouds.ui.listener.OnNavigationReselectedListener;
 import cn.yunliyunwai.beyondclouds.util.CategoryViewpagerUtils;
 import cn.yunliyunwai.beyondclouds.util.ContextUtils;
 import cn.yunliyunwai.beyondclouds.viewmodel.DynamicFragmentViewModel;
 import cn.yunliyunwai.beyondclouds.viewmodel.DynamicListFragmentViewModel;
 
 
-public class DynamicFragment extends BaseFragment<DynamicFragmentViewModel, FragmentDynamicBinding> {
+public class DynamicFragment extends BaseFragment<DynamicFragmentViewModel, FragmentDynamicBinding> implements OnNavigationReselectedListener {
 
     @Inject
     ViewModelProvider.Factory factory;
@@ -60,6 +61,11 @@ public class DynamicFragment extends BaseFragment<DynamicFragmentViewModel, Frag
         }, binding.magicIndicator, binding.viewPager, viewModel, true);
     }
 
+    @Override
+    public void onNavigationReselected() {
+        CategoryViewpagerUtils.forceRefresh(binding.viewPager.getAdapter());
+    }
+
     public static class DynamicListFragment extends RefreshableFragment<Post, DynamicListFragmentViewModel> {
 
         @Inject

app/src/main/java/cn/yunliyunwai/beyondclouds/ui/HomeFragment.java

@@ -25,12 +25,13 @@ import cn.yunliyunwai.beyondclouds.data.model.Blog;
 import cn.yunliyunwai.beyondclouds.databinding.FragmentHomeBinding;
 import cn.yunliyunwai.beyondclouds.ui.common.FragmentFactory;
 import cn.yunliyunwai.beyondclouds.ui.common.RefreshableFragment;
+import cn.yunliyunwai.beyondclouds.ui.listener.OnNavigationReselectedListener;
 import cn.yunliyunwai.beyondclouds.util.CategoryViewpagerUtils;
 import cn.yunliyunwai.beyondclouds.util.ContextUtils;
 import cn.yunliyunwai.beyondclouds.viewmodel.BlogListFragmentViewModel;
 import cn.yunliyunwai.beyondclouds.viewmodel.HomeFragmentViewModel;
 
-public class HomeFragment extends BaseFragment<HomeFragmentViewModel, FragmentHomeBinding> {
+public class HomeFragment extends BaseFragment<HomeFragmentViewModel, FragmentHomeBinding> implements OnNavigationReselectedListener {
 
     @Inject
     ViewModelProvider.Factory factory;
@@ -75,6 +76,11 @@ public class HomeFragment extends BaseFragment<HomeFragmentViewModel, FragmentHo
 
     }
 
+    @Override
+    public void onNavigationReselected() {
+        CategoryViewpagerUtils.forceRefresh(binding.viewPager.getAdapter());
+    }
+
     public static class BlogListFragment extends RefreshableFragment<Blog, BlogListFragmentViewModel> {
 
         @Inject

app/src/main/java/cn/yunliyunwai/beyondclouds/ui/ProjectFragment.java

@@ -25,13 +25,14 @@ import cn.yunliyunwai.beyondclouds.data.model.Project;
 import cn.yunliyunwai.beyondclouds.databinding.FragmentProjectBinding;
 import cn.yunliyunwai.beyondclouds.ui.common.FragmentFactory;
 import cn.yunliyunwai.beyondclouds.ui.common.RefreshableFragment;
+import cn.yunliyunwai.beyondclouds.ui.listener.OnNavigationReselectedListener;
 import cn.yunliyunwai.beyondclouds.util.CategoryViewpagerUtils;
 import cn.yunliyunwai.beyondclouds.util.ContextUtils;
 import cn.yunliyunwai.beyondclouds.viewmodel.ProjectFragmentViewModel;
 import cn.yunliyunwai.beyondclouds.viewmodel.ProjectListFragmentViewModel;
 
 
-public class ProjectFragment extends BaseFragment<ProjectFragmentViewModel, FragmentProjectBinding> {
+public class ProjectFragment extends BaseFragment<ProjectFragmentViewModel, FragmentProjectBinding> implements OnNavigationReselectedListener {
 
     @Inject
     ViewModelProvider.Factory factory;
@@ -76,6 +77,11 @@ public class ProjectFragment extends BaseFragment<ProjectFragmentViewModel, Frag
 
     }
 
+    @Override
+    public void onNavigationReselected() {
+        CategoryViewpagerUtils.forceRefresh(binding.viewPager.getAdapter());
+    }
+
     public static class ProjectListFragment extends RefreshableFragment<Project, ProjectListFragmentViewModel> {
 
         @Inject

app/src/main/java/cn/yunliyunwai/beyondclouds/ui/QAFragment.java

@@ -22,6 +22,7 @@ import cn.yunliyunwai.beyondclouds.data.model.Question;
 import cn.yunliyunwai.beyondclouds.databinding.FragmentQaBinding;
 import cn.yunliyunwai.beyondclouds.ui.common.FragmentFactory;
 import cn.yunliyunwai.beyondclouds.ui.common.RefreshableFragment;
+import cn.yunliyunwai.beyondclouds.ui.listener.OnNavigationReselectedListener;
 import cn.yunliyunwai.beyondclouds.util.CategoryViewpagerUtils;
 import cn.yunliyunwai.beyondclouds.util.ContextUtils;
 import cn.yunliyunwai.beyondclouds.util.ViewModelUtils;
@@ -29,7 +30,7 @@ import cn.yunliyunwai.beyondclouds.viewmodel.QAFragmentViewModel;
 import cn.yunliyunwai.beyondclouds.viewmodel.QuestionListFragmentViewModel;
 
 
-public class QAFragment extends BaseFragment<QAFragmentViewModel, FragmentQaBinding> {
+public class QAFragment extends BaseFragment<QAFragmentViewModel, FragmentQaBinding> implements OnNavigationReselectedListener {
 
     @Inject
     ViewModelProvider.Factory factory;
@@ -60,6 +61,11 @@ public class QAFragment extends BaseFragment<QAFragmentViewModel, FragmentQaBind
         }, binding.magicIndicator, binding.viewPager, viewModel, false);
     }
 
+    @Override
+    public void onNavigationReselected() {
+        CategoryViewpagerUtils.forceRefresh(binding.viewPager.getAdapter());
+    }
+
     public static class QuestionListFragment extends RefreshableFragment<Question, QuestionListFragmentViewModel> {
 
         @Inject

app/src/main/java/cn/yunliyunwai/beyondclouds/ui/listener/OnNavigationReselectedListener.java

+package cn.yunliyunwai.beyondclouds.ui.listener;
+
+public interface OnNavigationReselectedListener {
+    void onNavigationReselected();
+}

app/src/main/java/cn/yunliyunwai/beyondclouds/util/CategoryViewpagerUtils.java

 package cn.yunliyunwai.beyondclouds.util;
 
+import androidx.fragment.app.Fragment;
+import androidx.viewpager.widget.PagerAdapter;
 import androidx.viewpager.widget.ViewPager;
 
 import net.lucode.hackware.magicindicator.MagicIndicator;
@@ -12,6 +14,7 @@ import cn.yunliyunwai.beyondclouds.adapter.common.CategoryNavigatorAdapter;
 import cn.yunliyunwai.beyondclouds.base.BaseActivity;
 import cn.yunliyunwai.beyondclouds.base.BaseFragment;
 import cn.yunliyunwai.beyondclouds.ui.common.FragmentFactory;
+import cn.yunliyunwai.beyondclouds.ui.common.RefreshableFragment;
 import cn.yunliyunwai.beyondclouds.viewmodel.common.CategoryViewModel;
 
 public class CategoryViewpagerUtils {
@@ -48,4 +51,13 @@ public class CategoryViewpagerUtils {
                             commonNavigator.setAdapter(new CategoryNavigatorAdapter(categories, viewPager));
                         });
     }
+
+    public static void forceRefresh(PagerAdapter adapter) {
+        if (adapter instanceof CategoryFragmentPagerAdapter) {
+            Fragment fragment = ((CategoryFragmentPagerAdapter) adapter).getCurrentFragment();
+            if (null != fragment && fragment instanceof RefreshableFragment) {
+                ((RefreshableFragment) fragment).onRefresh();
+            }
+        }
+    }
 }