自定义警告对话框，RecyclerView

问题描述

我用 RecyclerView 来列举一些文字，现在我想，这样当文本用户点击自定义警告对话框弹出来做到这一点。

到目前为止我试过，但得到一个NullPointerException异常;这可能是错在这里？

 公共类CBAdapter扩展RecyclerView.Adapter＆LT; CBAdapter.ViewHolder＆GT; {清单＆LT; AdapterData＆GT; mItems;公共CBAdapter（）{
    超（）;
    mItems =新的ArrayList＆LT;＆GT;（）;
    AdapterData数据=新AdapterData（）;
    data.setTextOne（许多弓）;
    mItems.add（数据）;    数据=新AdapterData（）;
    data.setTextOne（对不起）;
    mItems.add（数据）;    数据=新AdapterData（）;
    data.setTextOne（下降到膝盖和放大器;求）;
    mItems.add（数据）;    数据=新AdapterData（）;
    data.setTextOne（后空翻）;
    mItems.add（数据）;}@覆盖
公共ViewHolder onCreateViewHolder（ViewGroup中ViewGroup中，int i）以{
    视图V = LayoutInflater.from（viewGroup.getContext（））
            .inflate（R.layout.test3，ViewGroup中，FALSE）;
    返回新ViewHolder（V）;
}@覆盖
公共无效onBindViewHolder（ViewHolder viewHolder，int i）以{
    AdapterData数据= mItems.get（I）
    viewHolder.textOne.setText（data.getTextOne（））;}
@覆盖
公众诠释getItemCount（）{    返回mItems.size（）;
}类ViewHolder扩展RecyclerView.ViewHolder {    公众的TextView textOne;
    私人上下文的背景下;    公共ViewHolder（查看ItemView控件）{
        超（ItemView控件）;
        textOne =（TextView中）itemView.findViewById（R.id.textView1）;        itemView.setOnClickListener（新View.OnClickListener（）{
            @覆盖
            公共无效的onClick（视图v）{                最后对话的对话=新的对话框（背景）;
                dialog.setContentView（R.layout.custom_dialog）;
                dialog.setTitle（标题）;                TextView的文本=（TextView的）dialog.findViewById（R.id.text）;
                text.setText（世界你好）;                ImageView的图像=（ImageView的）dialog.findViewById（R.id.image）;
                image.setImageResource（R.drawable.ic_launcher）;                按钮dialogBu​​tton =（按钮）dialog.findViewById（R.id.dialogBu​​ttonOK）;                dialogBu​​tton.setOnClickListener（新View.OnClickListener（）{
                    @覆盖
                    公共无效的onClick（视图v）{
                        dialog.dismiss（）;
                    }
                }）;                dialog.show（）;
            }
        }）;
    }
}
}
 

解决方案

没关系我忘了初始化我的上下文

=背景itemView.getContext（）;

I'm using RecyclerView to list some text and now I want to make it so that when the user clicks on text a custom Alert Dialog box pops up.

I have tried this so far but get a NullPointerException; what could be wrong here?

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

List<AdapterData> mItems;

public CBAdapter() {
    super();
    mItems = new ArrayList<>();
    AdapterData data = new AdapterData();
    data.setTextOne("Many Bows");
    mItems.add(data);

    data = new AdapterData();
    data.setTextOne("Pardon");
    mItems.add(data);

    data = new AdapterData();
    data.setTextOne("Fall To Knees & Beg");
    mItems.add(data);

    data = new AdapterData();
    data.setTextOne("Backflips");
    mItems.add(data);



}

@Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
    View v = LayoutInflater.from(viewGroup.getContext())
            .inflate(R.layout.test3, viewGroup, false);
    return new ViewHolder(v);
}

@Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {
    AdapterData data = mItems.get(i);
    viewHolder.textOne.setText(data.getTextOne());

}


@Override
public int getItemCount() {

    return mItems.size();
}

class ViewHolder extends RecyclerView.ViewHolder{

    public TextView textOne;
    private Context context;





    public ViewHolder(View itemView) {
        super(itemView);
        textOne = (TextView)itemView.findViewById(R.id.textView1);

        itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                final Dialog dialog = new Dialog(context);
                dialog.setContentView(R.layout.custom_dialog);
                dialog.setTitle("Title");

                TextView text = (TextView) dialog.findViewById(R.id.text);
                text.setText("hello world");

                ImageView image = (ImageView) dialog.findViewById(R.id.image);
                image.setImageResource(R.drawable.ic_launcher);

                Button dialogButton = (Button) dialog.findViewById(R.id.dialogButtonOK);

                dialogButton.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        dialog.dismiss();
                    }
                });

                dialog.show();
            }
        });


    }
}
}

解决方案

Nevermind I forgot the initialization my context

context = itemView.getContext();

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