android java 每 2 篇博客文章后显示来自 firebase 实时数据库的广告

问题描述 投票：0回答：1

我有以下 firebase 实时数据库，其中 root 中有 patrs

1：博客帖子 2：广告

  • 根

  • 博客帖子

    • post_id_1
      • 标题：“博客文章 1”
      • 内容：“博客文章1的内容”
      • 内容类型：“文本”
      • contentUrl：“https://example.com/post1”
    • post_id_2
      • 标题：“博客文章 2”
      • 内容：“博客文章2的内容”
      • 内容类型：“文本”
      • contentUrl：“https://example.com/post2”

  • post_id_3

    • 标题：“博客文章 3”
    • 内容：“博客文章3的内容”
    • 内容类型：“文本”
    • contentUrl：“https://example.com/post3”
    • post_id_4
      • 标题：“博客文章 4”
      • 内容：“博客文章4的内容”
      • 内容类型：“文本”
      • contentUrl：“https://example.com/post4”

    ...

  • 广告

    • ad_id_1
      • 标题：“广告1”
      • 内容：“广告1的内容”
      • 内容类型：“图像”
      • 内容网址：“https://example.com/ad1”
    • ad_id_2
      • 标题：“广告2”
      • 内容：“广告2的内容”
      • 内容类型：“图像”
      • 内容网址：“https://example.com/ad2”

我想要实现的是每 2 篇博客文章后显示广告。

但是当我运行我的代码时，这就是结果（所有帖子后都会出现广告）。

这是我的代码

    import androidx.appcompat.app.AppCompatActivity;
    import android.os.Bundle;
    import omega.jschii.healourlandafrica.R;
    import androidx.recyclerview.widget.LinearLayoutManager;
    import androidx.recyclerview.widget.RecyclerView;
    import com.google.firebase.database.DataSnapshot;
    import com.google.firebase.database.DatabaseError;
    import com.google.firebase.database.DatabaseReference;
    import com.google.firebase.database.FirebaseDatabase;
    import com.google.firebase.database.ValueEventListener;
    import java.util.ArrayList;
    import java.util.List;
    import androidx.annotation.NonNull;

            public class MainActivityViewPost extends AppCompatActivity {
                private RecyclerView recyclerView;
                private Adapter adapter;
                private List<Object> items;

                @Override
                protected void onCreate(Bundle savedInstanceState) {
                    super.onCreate(savedInstanceState);
                    setContentView(R.layout.activity_main_view_post);

                    recyclerView = findViewById(R.id.recyclerView);
                    LinearLayoutManager layoutManager = new LinearLayoutManager(this);
                    recyclerView.setLayoutManager(layoutManager);

                    items = new ArrayList<>();

                    DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference();
                    databaseReference.child("blog_posts").addListenerForSingleValueEvent(new ValueEventListener() {
                        @Override
                        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                            for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                                BlogPost blogPost = snapshot.getValue(BlogPost.class);
                                items.add(blogPost);
                            }
                            adapter.notifyDataSetChanged();
                        }

                        @Override
                        public void onCancelled(@NonNull DatabaseError databaseError) {
                            // Handle database error
                        }
                    });

                    databaseReference.child("Ads").addListenerForSingleValueEvent(new ValueEventListener() {
                        @Override
                        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                            for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                                Ads ad = snapshot.getValue(Ads.class);
                                items.add(ad);
                            }
                            adapter.notifyDataSetChanged();
                        }

                        @Override
                        public void onCancelled(@NonNull DatabaseError databaseError) {
                            // Handle database error
                        }
                    });
                    adapter = new Adapter(this, items);
                    recyclerView.setAdapter(adapter);
                }
            }

}

适配器类

   import android.content.Context;
   import android.view.LayoutInflater;
   import android.view.View;
   import android.view.ViewGroup;
   import android.widget.TextView;
   import androidx.annotation.NonNull;
   import androidx.recyclerview.widget.RecyclerView;
   import java.util.List;
public class Adapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static final int VIEW_TYPE_BLOG_POST = 0;
private static final int VIEW_TYPE_AD = 1;

private List<Object> items;
private Context context;

// Constructor
public Adapter(Context context, List<Object> items) {
    this.context = context;
    this.items = items;
}

@Override
public int getItemViewType(int position) {
    Object item = items.get(position);
    return item instanceof BlogPost ? VIEW_TYPE_BLOG_POST : VIEW_TYPE_AD;
}

@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    LayoutInflater inflater = LayoutInflater.from(parent.getContext());
    if (viewType == VIEW_TYPE_BLOG_POST) {
        View itemView = inflater.inflate(R.layout.item_blog_post, parent, false);
        return new BlogPostViewHolder(itemView);
    } else {
        View itemView = inflater.inflate(R.layout.item_ad, parent, false);
        return new AdViewHolder(itemView);
    }
}

@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
    if (holder instanceof BlogPostViewHolder) {
        BlogPostViewHolder blogPostViewHolder = (BlogPostViewHolder) holder;
        BlogPost blogPost = (BlogPost) items.get(position);
        blogPostViewHolder.bind(blogPost);
    } else if (holder instanceof AdViewHolder) {
        AdViewHolder adViewHolder = (AdViewHolder) holder;
        Ads ad = (Ads) items.get(position);
        adViewHolder.bind(ad);
    }
}

@Override
public int getItemCount() {
    return items.size();
}

// ViewHolder classes for blog posts and ads
private class BlogPostViewHolder extends RecyclerView.ViewHolder {
    private TextView titleTextView;


    BlogPostViewHolder(@NonNull View itemView) {
        super(itemView);
        titleTextView = itemView.findViewById(R.id.titleTextView);
    }

    void bind(BlogPost blogPost) {
        titleTextView.setText(blogPost.getTitle());
    }
}

private class AdViewHolder extends RecyclerView.ViewHolder {
    private TextView titleTextView;


    AdViewHolder(@NonNull View itemView) {
        super(itemView);
        titleTextView = itemView.findViewById(R.id.titleTextView);

    }

    void bind(Ads ad) {
        titleTextView.setText(ad.getTitle());

    }
}

}

这是输出

如何让广告1出现在post2之后，Ad2出现在post4之后，Ad3出现在post6之后

java android firebase firebase-realtime-database
1个回答
0
投票

您可以通过在 RecyclerView 中的特定帖子之后显示广告来获得这种类型的结果，您可以修改 RecyclerView 适配器以包含在这些位置显示广告的逻辑。

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;

public class PostAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    private static final int VIEW_TYPE_POST = 0;
    private static final int VIEW_TYPE_AD = 1;

    private Context context;
    private ArrayList<Post> posts;

    public PostAdapter(Context context, ArrayList<Post> posts) {
        this.context = context;
        this.posts = posts;
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        if (viewType == VIEW_TYPE_POST) {
            View view = inflater.inflate(R.layout.item_post, parent, false);
            return new PostViewHolder(view);
        } else {
            View view = inflater.inflate(R.layout.item_ad, parent, false);
            return new AdViewHolder(view);
        }
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        if (holder instanceof PostViewHolder) {
            bindPostViewHolder((PostViewHolder) holder, position);
        } else if (holder instanceof AdViewHolder) {
            // Bind ad view holder
        }
    }

    private void bindPostViewHolder(PostViewHolder holder, int position) {
        Post post = posts.get(position);
        holder.txtTitle.setText(post.getTitle());
        Picasso.get().load(post.getImageUrl()).into(holder.imgPost);
    }

    @Override
    public int getItemCount() {
        return posts.size() + getAdCount(posts.size());
    }

    @Override
    public int getItemViewType(int position) {
        if (isAdPosition(position)) {
            return VIEW_TYPE_AD;
        } else {
            return VIEW_TYPE_POST;
        }
    }

    private boolean isAdPosition(int position) {
        return position == 2 || position == 5 || position == 8; // Ads after post 2, 5, and 8
    }

    private int getAdCount(int postCount) {
        return postCount / 3; // Assuming an ad after every 3 posts
    }

    private static class PostViewHolder extends RecyclerView.ViewHolder {
        TextView txtTitle;
        ImageView imgPost;

        PostViewHolder(View itemView) {
            super(itemView);
            txtTitle = itemView.findViewById(R.id.txt_title);
            imgPost = itemView.findViewById(R.id.img_post);
        }
    }

    private static class AdViewHolder extends RecyclerView.ViewHolder {
        // Add ad view components here
        AdViewHolder(View itemView) {
            super(itemView);
            // Initialize ad view components
        }
    }
}
最新问题
© www.soinside.com 2019 - 2024. All rights reserved.