Recycler View 和 Adapter 打开 Activity 内容不同

Question

我正在制作新闻应用。我有 2 个活动。第一个 activity 包含显示不同新闻项目的 RecyclerView。为此，我创建了适配器。这是我的适配器代码：

public class NewsAdapter extends RecyclerView.Adapter<NewsAdapter.NewsViewHolder> {

    Context context;
    List<NewsItem> newsItemList;

    public NewsAdapter(Context context, List<NewsItem> newsItemList) {
        this.context = context;
        this.newsItemList = newsItemList;
    }
    @NonNull
    @Override
    public NewsViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.news_row_item, parent, false);
        return new NewsViewHolder(view);
    }
    @Override
    public void onBindViewHolder(NewsViewHolder holder, int position) {
        holder.newsImage.setImageResource(newsItemList.get(position).getNewsImage());
        holder.newsName.setText(newsItemList.get(position).getNewsName());

        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(context, NewsDetails.class);
                intent.putExtra("title",R.string.newsContent1);
                intent.putExtra("image",R.drawable.newsImage1);
                context.startActivity(intent);
            }
        });
    }
    @Override
    public int getItemCount() {
        return newsItemList.size();
    }
    public static final class NewsViewHolder extends RecyclerView.ViewHolder {
        ImageView newsImage;
        TextView newsName;

        public NewsViewHolder(@NonNull View itemView) {
            super(itemView);

            newsImage = itemView.findViewById(R.id.newsImage);
            newsName = itemView.findViewById(R.id.newsName);
        }
    }
}

我的 News.java 代码如下所示

public class news extends AppCompatActivity {

    RecyclerView newsRecycler;
    NewsAdapter newsAdapter;

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

        List<NewsItem> newsItems = new ArrayList<>();
        newsItems.add(new NewsItem("Text", R.drawable.im_maincorpus1));
        newsItems.add(new NewsItem("Text", R.drawable.im_maincorpus1));
        newsItems.add(new NewsItem("Text", R.drawable.im_maincorpus1));
        newsItems.add(new NewsItem("Text", R.drawable.im_maincorpus1));

        setNewsRecycler(newsItems);*/
    }
        private void setNewsRecycler(List<NewsItem> newsItemsList){
        newsRecycler = findViewById(R.id.newsRecycler);
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this, RecyclerView.VERTICAL, false);
        newsRecycler.setLayoutManager(layoutManager);

        newsAdapter = new NewsAdapter(this, newsItemsList);
        newsRecycler.setAdapter(newsAdapter);
    }
}

在我使用 ImageView 和 2 个 TextView 创建 NewsDetails activity 之后。我给了他们身份证。我想要做的是在 NewsActivity 上选择的这个基于 activity 的新闻项目中显示不同的内容。我已经为 TextView 创建了字符串并为 ImageView 创建了导入的图像。我怎样才能做到这一点？提前感谢您的帮助。

在查看 liveAnyway 的回答后，我将其添加到我的 NewsDetails.java。图像更改有效，但文本无效。

public class NewsDetails extends AppCompatActivity {

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

        String newTitle = getIntent().getStringExtra("title");
        int newImage = getIntent().getIntExtra("image", 0);

        TextView newsText = (TextView) findViewById(R.id.newsDetailsContent);
        ImageView newsImage = (ImageView) findViewById(R.id.newsDetailsImage);

        newsText.setText(newTitle);
        newsImage.setImageResource(newImage);
    }
}

我的 NewsItem.java 文件

public class NewsItem {

    String newsName;
    Integer newsImage;

    public NewsItem(String newsName, Integer newsImage) {
        this.newsName = newsName;
        this.newsImage = newsImage;
    }

    public String getNewsName() {
        return newsName;
    }

    public void setNewsName(String newsName) {
        this.newsName = newsName;
    }

    public Integer getNewsImage() {
        return newsImage;
    }

    public void setNewsImage(Integer newsImage) {
        this.newsImage = newsImage;
    }
}

Answer 1

在 startActivity(intent) 之前使用 intent.putExtra()，如下所示

如果您的 NewsItem 属性很少


@Override
public void onClick(View v) {
   //image from newsItemList.get(position).getNewsImage()
   //name from newsItemList.get(position).getNewsName()
   Intent intent = new Intent(context, NewsDetails.class);
   //it just example, You can just put any data what you need
   intent.putExtra("name",name);
   intent.putExtra("image",image);
   ...
   context.startActivity(intent);
}

如果您的 NewsItem 可以 Parcelable

@Override
public void onClick(View v) {
   Intent intent = new Intent(context, NewsDetails.class);
   intent.putExtra("newsItem",newsItem);
   
   context.startActivity(intent);
}

在你的 NewsDetailActivity

//in onCreate()
String newTitle = getIntent().getStringExtra("name");
Int newDrawable = getIntent().getIntExtra("image"); 
//or
NewsItem item = getIntent().getParcelableExtra("newsItem");

更新1

检查点

R.string.id 是 int 所以你应该像下面这样改变

int strId = getIntent().getIntExtra("title");
String title = getString(strId);

你这样写

intent.putExtra("title",R.string.newsContent1);
intent.putExtra("image",R.drawable.newsImage1);

这不是个好主意

您的 NewsItem 需要该数据（如 R.string.newsContent1、R.drawable.newsImage）并使用来自 newsItemList.get(position)

的数据

//for example
int newsContentsStrId =  newsItemList.get(position).getNewsContentsStrId();
int newsImageResId = newsItemList.get(position).getNewsImageResId();
intent.putExtra("title",newsContentsStrId);
intent.putExtra("image",newsImageResId);

更新2

如果你的NewsItem喜欢这样

public class NewsItem {
    String newsName;
    Integer newsImage;
    //added more that you need (it just example)
    Integer newsContentsStrId;
    
    public NewsItem(String newsName, Integer newsImage, Integer newsContentsStrId) {
        this.newsName = newsName;
        this.newsImage = newsImage;
        this.newsContentsStrId = newsContentsStrId;
    }

    public String getNewsName() {
        return newsName;
    }

    public void setNewsName(String newsName) {
        this.newsName = newsName;
    }

    public Integer getNewsImage() {
        return newsImage;
    }

    public void setNewsImage(Integer newsImage) {
        this.newsImage = newsImage;
    }

    public Integer getNewsContentsStrId() {
        return newsContentsStrId;
    }

    public void setNewsContentsStrId(Integer newsContentsStrId) {
        this.newsContentsStrId = newsContentsStrId;
    }
}

构造NewsItem的时候就把这个写上去，我想你已经知道了。

//in news onCreate()
List<NewsItem> newsItems = new ArrayList<>();
newsItems.add(new NewsItem("Text", R.drawable.im_maincorpus1,R.string.newArtical1));
newsItems.add(new NewsItem("Text", R.drawable.im_maincorpus1,R.string.newArtical2));
newsItems.add(new NewsItem("Text", R.drawable.im_maincorpus1,R.string.newArtical3));
newsItems.add(new NewsItem("Text", R.drawable.im_maincorpus1,R.string.newArtical4));

Recycler View 和 Adapter 打开 Activity 内容不同

Recycler VIew and Adapter open Activity with different content

java

android

adapter

android-studio

android-recyclerview

更新1

更新2