在回收站視圖中單擊項目時顯示按鈕

Question

我是android的新手

我有這個適配器類用於列出聯系人

import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;

public class ContactAdapter extends RecyclerView.Adapter<ContactAdapter.MyViewHolder>{

    public ImageButton mCallButton, mMoreButton, mSmsButton, mEmailButton;
    public TextView mContactName;
    public List<Contact> mContactList;
    public Context mContext;

    public class MyViewHolder extends RecyclerView.ViewHolder implements OnClickListener{

        public MyViewHolder(View view) {
            super(view);
            mContactName = (TextView) view.findViewById(R.id.tv_contact_name);
            mCallButton = (ImageButton) view.findViewById(R.id.imgbtn_call);
            mMoreButton = (ImageButton) view.findViewById(R.id.imgbtn_more);
            mSmsButton = (ImageButton) view.findViewById(R.id.imgbtn_sms);
            mEmailButton = (ImageButton) view.findViewById(R.id.imgbtn_email);
            mContext = view.getContext();
            mCallButton.setOnClickListener(this);
            mMoreButton.setOnClickListener(this);
            mSmsButton.setOnClickListener(this);
            mEmailButton.setOnClickListener(this);
        }

        public void onClick(View v) {
            int index = getAdapterPosition();
            String number = mContactList.get(index).getContactNumber();
            String email = mContactList.get(index).getContactEmail();
            String name = mContactList.get(index).getContactName();
            if(v.getId() == mCallButton.getId()) {
                Intent callIntent = new Intent(Intent.ACTION_DIAL);
                callIntent.setData(Uri.parse("tel:"+number));
                mContext.startActivity(callIntent);
            }
            if(v.getId() == mMoreButton.getId()) {
                Log.d("Index kya hai?", index + "");
                mSmsButton.setVisibility(View.VISIBLE);
                mEmailButton.setVisibility(View.VISIBLE);
            }
            if(v.getId() == mSmsButton.getId()) {
                Intent smsIntent = new Intent(Intent.ACTION_VIEW);
                smsIntent.setType("vnd.android-dir/mms-sms");
                smsIntent.putExtra("address", number);
                mContext.startActivity(Intent.createChooser(smsIntent, "Send Sms To " + name + " (" + number + ")"));
            }
            if(v.getId() == mEmailButton.getId()) {
                Intent emailIntent = new Intent(Intent.ACTION_SEND);
                emailIntent.setType("text/plain");
                emailIntent.putExtra(Intent.EXTRA_EMAIL, email);
                mContext.startActivity(Intent.createChooser(emailIntent, "Send Email to " + email));
            }
        }
    }



    public ContactAdapter(List<Contact> contactList) {
        mContactList = contactList;
    }

    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.single_contact_layout, parent, false);
        return new MyViewHolder(itemView);
    }

    public void onBindViewHolder(MyViewHolder holder, int position) {
        Contact contact = mContactList.get(position);
        mContactName.setText(contact.getContactName());
    }

    public int getItemCount() {
        return mContactList.size();
    }
}

現在有一個圖像按鈕mMoreButton只有一個工作顯示隱藏圖像按鈕mSmsButton ， mEmailButton但是每當我點擊時，按鈕都沒有顯示正確的索引（？）

假設我點擊索引5，但mEmailButtton和mSmsButton會出現在隨機索引10上，我不知道我做錯了什么

Answer 1

將視圖（ TextView和ImageButton ）移動到ViewHolder類，因此不會始終替換它們的引用。 或者您可以在onBindViewHolder方法下設置按鈕單擊偵聽器，這是我在創建自定義recyclerview適配器時始終執行的操作。

ImageButton mSmsButton_last, mEmailButton_last;
public void onBindViewHolder(MyViewHolder holder, int position) {
    Contact contact = mContactList.get(position);
    holder.mContactName.setText(contact.getContactName());

    holder.mCallButton.setOnClickListener(new View.OnClickListener() {
         public void onClick(View v) {
            Intent callIntent = new Intent(Intent.ACTION_DIAL);
            callIntent.setData(Uri.parse("tel:"+number));
            mContext.startActivity(callIntent);
         }
    });

    holder.mMoreButton.setOnClickListener(new View.OnClickListener() {
         public void onClick(View v) {
            Log.d("Index kya hai?", index + "");
            holder.mSmsButton.setVisibility(View.VISIBLE);
            holder.mEmailButton.setVisibility(View.VISIBLE);
            if (mSmsButton_last != null && mEmailButton_last != null) {
                mSmsButton_last.setVisibility(View.GONE);
                mEmailButton_last.setVisibility(View.GONE);
            }
            mSmsButton_last = holder.mSmsButton;
            mEmailButton_last = holder.mEmailButton;
         }
    });

    holder.mSmsButton.setOnClickListener(new View.OnClickListener() {
         public void onClick(View v) {
            Intent smsIntent = new Intent(Intent.ACTION_VIEW);
            smsIntent.setType("vnd.android-dir/mms-sms");
            smsIntent.putExtra("address", number);
            mContext.startActivity(Intent.createChooser(smsIntent, "Send Sms To " + name + " (" + number + ")"));
         }
    });

    holder.mEmailButton.setOnClickListener(new View.OnClickListener() {
         public void onClick(View v) {
            Intent emailIntent = new Intent(Intent.ACTION_SEND);
            emailIntent.setType("text/plain");
            emailIntent.putExtra(Intent.EXTRA_EMAIL, email);
            mContext.startActivity(Intent.createChooser(emailIntent, "Send Email to " + email));
         }
    });
}

而你的ViewHolder就像這樣

public class MyViewHolder extends RecyclerView.ViewHolder{
    public ImageButton mCallButton, mMoreButton, mSmsButton, mEmailButton;
    public TextView mContactName;
    public MyViewHolder(View view) {
        super(view);
        mContactName = (TextView) view.findViewById(R.id.tv_contact_name);
        mCallButton = (ImageButton) view.findViewById(R.id.imgbtn_call);
        mMoreButton = (ImageButton) view.findViewById(R.id.imgbtn_more);
        mSmsButton = (ImageButton) view.findViewById(R.id.imgbtn_sms);
        mEmailButton = (ImageButton) view.findViewById(R.id.imgbtn_email);
        mContext = view.getContext();
    }
}

希望這對你有用。 :)