我有一组图像以随机方式显示在“回收者视图”中。问题是图像重复出现，而并非所有图像都被使用。我需要的是：使用的所有图像仅显示一次（不重复）。预先感谢您的帮助。
public class Article {
private int mTitle;
private static int[] sTitles = {
R.drawable.image1a,
R.drawable.image2a,
....
R.drawable.image30a
};
public Article() {
Random random = new Random();
// Collections.shuffle（Arrays.asList（sTitles））; //尝试使用此方法，但未成功
mTitle = sTitles[random.nextInt(sTitles.length)];
}
public int getTitle() {
return mTitle;
}
编辑：我的适配器代码
公共类MyAdapter扩展了RecyclerView.Adapter {
private ArrayList<Article> mArticles = new ArrayList<>();
公共RecyclerView mRecyclerView;
private class MyViewHolder extends RecyclerView.ViewHolder {
public ImageView mTitle;
public MyViewHolder(View pItem) {
super(pItem);
mTitle = (ImageView) pItem.findViewById(R.id.imageView);
}
}
public MyAdapter(ArrayList<Article> pArticles, RecyclerView pRecyclerView) {
mArticles = pArticles;
mRecyclerView = pRecyclerView;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, final int i) {
View view = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.article_layout, viewGroup, false);
return new MyViewHolder(view);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, final int i) {
Article article = mArticles.get(i);
((MyViewHolder) viewHolder).mTitle.setImageResource(article.getTitle());
}
@Override
public int getItemCount() {
return mArticles.size();
}
将您的Article类更改为此：
public class Article {
private int mTitle;
private static int[] sTitles = {
R.drawable.image1a,
R.drawable.image2a,
....
R.drawable.image30a
};
public Article(int title) {
this.mTitle = title;
}
public int getTitle() {
return mTitle;
}
public static ArrayList<Integer> getRandomArticles() {
ArrayList<Integer> titles = new ArrayList<>();
ArrayList<Integer> tempTitles = new ArrayList<Integer>(Arrays.asList(sTitles));
Collections.shuffle(tempTitles);
for(int title : tempTitles) {
titles.add(title);
}
return titles;
}
}
然后，当您创建适配器时，将Article.getRandomArticles（）作为文章列表传递，如下所示：
new MyAdapter(Article.getRandomArticles(), yourRecyclerView);
编辑：忘记了getRandomArticles的返回类型
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