如何在Android Recyclerview OnClick适配器中进行对话

Question

我想在RecyclerView中列出的项目的onClick事件中打开一个对话框。

这是Activity代码：

public class EventPage extends AppCompatActivity {
EventAdapter adapter;
private RecyclerView recyclerView;
ArrayList<String> ticketName=new ArrayList<String>();
ArrayList<String>ticketPrice=new ArrayList<String>();
ArrayList<String>ticketCode=new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.eventfinished);
    recyclerView = (RecyclerView) findViewById(R.id.rvUserProfile);
    adapter = new EventAdapter(ticketName, ticketPrice,getApplicationContext(),recyclerView);
    recyclerView.setHasFixedSize(true);
    recyclerView.setAdapter(adapter);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));
    adapter.notifyDataSetChanged();

这是Adapter代码：

public class EventAdapter extends RecyclerView.Adapter<info.androidhive.uplus.EventAdapter.MyViewHolder> {
private ArrayList<String> mDataset=new ArrayList<String>();
private ArrayList<String> mPrice=new ArrayList<String>();
Context ctx;
RecyclerView rec;
Uri uri;
public EventAdapter(ArrayList<String> mDataset,ArrayList<String> mPrice ,Context ctx,RecyclerView rec){
    this.mDataset   = mDataset;
    this.mPrice     = mPrice;
    this.ctx        = ctx;
    this.rec        =rec;
}
public static class MyViewHolder extends RecyclerView.ViewHolder{
    // public CardView mCardView;
    public TextView mTextView, mTicketPrice;
    public RelativeLayout relativeLayout;// mCardView;
    public MyViewHolder(View v, final Context context,final ArrayList<String>eventName, final ArrayList<String>eventPrice,final RecyclerView rcc){
        super(v);
        mTextView       = (TextView) v.findViewById(R.id.ticketName1);
        mTicketPrice    = (TextView) v.findViewById(R.id.ticketamount);
        v.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int p=rcc.indexOfChild(v);
                try
                {
                    final Dialog dialog = new Dialog(context);
                    dialog.setCancelable(true);
                    dialog.setContentView(R.layout.bookticket);
                    dialog.show();
                    Toast.makeText(context,"Clicked"+eventName.get(p),Toast.LENGTH_LONG).show();
                }
                catch (Exception ex)
                {
                    ex.printStackTrace();
                }
            }
        });
    }
}

@Override
public info.androidhive.uplus.EventAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType){
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.eventitem, parent, false);
    info.androidhive.uplus.EventAdapter.MyViewHolder vh = new info.androidhive.uplus.EventAdapter.MyViewHolder(v, this.ctx, this.mDataset, this.mPrice, this.rec);
    return vh;
}
@Override
public void onBindViewHolder(final info.androidhive.uplus.EventAdapter.MyViewHolder holder, final int position){
    holder.mTextView.setText(mDataset.get(position));
    holder.mTicketPrice.setText(currencyConverter(mPrice.get(position)));
}

这是我在列表中单击元素时遇到的错误：

android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application

Answer 1

您的上下文是空的，请按以下步骤带来Java类中的上下文

 public static Context contextOfApplication;  // create variable
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         contextOfApplication = getApplicationContext();
}

在外部创建方法 ongreate

public static Context getContextOfApplication(){
        return contextOfApplication;
    }

现在在适配器类中添加上下文

final Dialog dialog = new Dialog("youractivityname".getContextOfApplication());

(或( @sachinvarma建议

只需使用此 v.getContext((