zhibo/android-app/app/src/main/java/com/example/livestreaming/FindGameActivity.java

package com.example.livestreaming;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;

import com.example.livestreaming.databinding.ActivityFindGameBinding;
import com.google.android.material.bottomnavigation.BottomNavigationView;

import java.util.List;

public class FindGameActivity extends AppCompatActivity {

    private static final String CATEGORY = "找人玩游戏";
    private ActivityFindGameBinding binding;
    private PostAdapter postAdapter;

    public static void start(Context context) {
        Intent intent = new Intent(context, FindGameActivity.class);
        context.startActivity(intent);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivityFindGameBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        setupUI();
        setupRecyclerView();
        loadPosts();
    }

    private void setupUI() {
        binding.backButton.setOnClickListener(v -> finish());

        binding.fabPublish.setOnClickListener(v -> {
            PublishPostHelper.showPublishDialog(this, CATEGORY, new PublishPostHelper.PublishCallback() {
                @Override
                public void onSuccess(Post post) {
                    postAdapter.addPost(post);
                    binding.recyclerPosts.scrollToPosition(0);
                    updateEmptyView();
                }

                @Override
                public void onError(String error) {}
            });
        });

        BottomNavigationView bottomNavigation = binding.bottomNavInclude.bottomNavigation;
        bottomNavigation.setSelectedItemId(R.id.nav_friends);
        UnreadMessageManager.updateBadge(bottomNavigation);
        
        bottomNavigation.setOnItemSelectedListener(item -> {
            int id = item.getItemId();
            if (id == R.id.nav_home) {
                startActivity(new Intent(this, MainActivity.class));
                finish();
                return true;
            }
            if (id == R.id.nav_wish_tree) {
                WishTreeActivity.start(this);
                finish();
                return true;
            }
            if (id == R.id.nav_messages) {
                MessagesActivity.start(this);
                finish();
                return true;
            }
            if (id == R.id.nav_profile) {
                ProfileActivity.start(this);
                finish();
                return true;
            }
            return true;
        });
    }

    private void setupRecyclerView() {
        postAdapter = new PostAdapter();
        binding.recyclerPosts.setLayoutManager(new LinearLayoutManager(this));
        binding.recyclerPosts.setAdapter(postAdapter);
    }

    private void loadPosts() {
        List<Post> posts = PostManager.getPostsByCategory(this, CATEGORY);
        postAdapter.setPosts(posts);
        updateEmptyView();
    }

    private void updateEmptyView() {
        if (postAdapter.getItemCount() == 0) {
            binding.emptyView.setVisibility(View.VISIBLE);
            binding.recyclerPosts.setVisibility(View.GONE);
        } else {
            binding.emptyView.setVisibility(View.GONE);
            binding.recyclerPosts.setVisibility(View.VISIBLE);
        }
    }
    
    @Override
    protected void onResume() {
        super.onResume();
        if (binding != null) {
            BottomNavigationView bottomNav = binding.bottomNavInclude.bottomNavigation;
            bottomNav.setSelectedItemId(R.id.nav_friends);
            UnreadMessageManager.updateBadge(bottomNav);
            loadPosts();
        }
    }
}