单击 RecyclerView 中的特定项目后如何打开 URL？答案

【问题标题】：How to open URL after clicking at a particular item in RecyclerView?单击 RecyclerView 中的特定项目后如何打开 URL？
【发布时间】：2020-08-21 09:02:59
【问题描述】：

我将一个对象列表传递给我的适配器。对象的类型为Uploads 类，其中仅包含Docname 和Docurl。在每个 RecyclerView 项目上显示 Docname 后，我希望当用户点击任何项目时，浏览器应该打开与该项目的 URL 对应的 URL。

这是我尝试过的。它没有抛出任何错误，应用程序运行顺利，但是当我点击任何项目时，什么也没有发生。

public class EbookRepresentAdapter extends RecyclerView.Adapter<EbookRepresentAdapter.EbookRepresentViewHolder> {

    private Context mContext;
    private List<Uploads> mbooks;
    public String bookurl;


    public EbookRepresentAdapter(Context context, List<Uploads> books) {
        mContext = context;
        mbooks = books;
    }

    public class EbookRepresentViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

        public Context usecontext;
        public TextView mbookname;


        public EbookRepresentViewHolder(View itemView) {
            super(itemView);

            mbookname = itemView.findViewById(R.id.subjectname);
            usecontext=itemView.getContext();

        }


        @Override
        public void onClick(View v) {

            Intent intent=new Intent(Intent.ACTION_VIEW);
            intent.setData(Uri.parse(bookurl));
            mContext.startActivity(intent);
        }
    }
    

    @NonNull
    @Override
    public EbookRepresentViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v= LayoutInflater.from(mContext).inflate(R.layout.subjectcard,parent,false);
        return new EbookRepresentViewHolder(v);
    }

    @Override
    public void onBindViewHolder(@NonNull EbookRepresentViewHolder holder, int position) {

        Uploads yearSubjectcurrent= mbooks.get(position);
        String subname=yearSubjectcurrent.getDocname();
        bookurl= yearSubjectcurrent.getDocurl();
        //Log.d(TAG,"subname = "+ subname);
        holder.mbookname.setText(subname);

    }

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

如果有人能帮忙就好了。

【问题讨论】：

标签： android android-recyclerview android-adapter

【解决方案1】：

您需要添加itemView.setOnClickListener(this)

public EbookRepresentViewHolder(View itemView) {
            super(itemView);

            mbookname = itemView.findViewById(R.id.subjectname);
            usecontext=itemView.getContext();
            itemView.setOnClickListener(this)
        }

加上改变这个

public void onBindViewHolder(@NonNull EbookRepresentViewHolder holder, int position) {

        Uploads yearSubjectcurrent= mbooks.get(position);
        String subname=yearSubjectcurrent.getDocname();
        bookurl= yearSubjectcurrent.getDocurl();
        //Log.d(TAG,"subname = "+ subname);
        holder.mbookname.setText(subname);

到

 public void onBindViewHolder(@NonNull EbookRepresentViewHolder holder, int position) {

    Uploads yearSubjectcurrent= mbooks.get(position);
    String subname=yearSubjectcurrent.getDocname();
    //bookurl= yearSubjectcurrent.getDocurl(); //delete this line
    //Log.d(TAG,"subname = "+ subname);
    holder.mbookname.setText(subname);

}

    }

您将覆盖 bookurl 变量。

并使用

public void onClick(View v) {
            int i = getLayoutPosition();
            Uploads yearSubjectcurrent= mbooks.get(i);
            bookurl= yearSubjectcurrent.getDocurl();
            //than Intent Code
        }

【讨论】：

【解决方案2】：

您忘记添加itemView.setOnClickListener(this)

就用这个吧，

        public EbookRepresentViewHolder(View itemView) {
            super(itemView);

            mbookname = itemView.findViewById(R.id.subjectname);
            usecontext=itemView.getContext();
            itemView.setOnClickListener(this)
        }

【讨论】：

【解决方案3】：

在你的 itemview 上设置 onClickListener 作为

 public EbookRepresentViewHolder(View itemView) {
            super(itemView);

            mbookname = itemView.findViewById(R.id.subjectname);
            usecontext=itemView.getContext();
            itemView.setOnClickListener(this);

        }

【讨论】：