Question

我已经汇总了一些代码，如下所示，它从服务器上托管的JSON文件中获取数据并将其放入RecyclcerView中。这一直工作正常，但任何方式我尝试添加一个单击方法它不起作用。我希望这样做，如果我点击其中一行，它会告诉我它的国家。我不知道我哪里出错了，但我会在下面附上我的代码，获取JSON数据并将其放入RecyclerView。

由于

package com.example.curtisboylan.myapplication;

import android.app.ProgressDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;


import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import android.widget.TextView;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;

import java.util.ArrayList;
import java.util.Objects;

public class MainRecycler extends AppCompatActivity {


    private ArrayList countries;
    private static String url = "http://curtisboylan.me/mygeek/mygeektest.php";

    private String TAG = MainActivity.class.getSimpleName();

    private ProgressDialog pDialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        countries = new ArrayList<>();
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_recycler);
        initViews();
        Bundle bundle = getIntent().getExtras();
        String message = bundle.getString("message");
        TextView txtView = (TextView) findViewById(R.id.textView5);
        if (Objects.equals(message, "di1")){
            txtView.setText("Diagnostics");
        }
        else if (Objects.equals(message, "screen1")){
            txtView.setText("Screen Repair");
        }

        setTitle("Available Technicians");
    }
    private void initViews(){
        RecyclerView recyclerView = (RecyclerView)findViewById(R.id.card_recycler_view);
        recyclerView.setHasFixedSize(true);
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
        recyclerView.setLayoutManager(layoutManager);
        new GetContacts().execute();
    }
    private class GetContacts extends AsyncTask<Void, Void, Void> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            // Showing progress dialog
            pDialog = new ProgressDialog(MainRecycler.this);
            pDialog.setMessage("Please Wait..");
            pDialog.setCancelable(false);
            pDialog.show();

        }

        @Override
        protected Void doInBackground(Void... arg0) {
            HttpHandler sh = new HttpHandler();

            // Making a request to url and getting response
            String jsonStr = sh.makeServiceCall(url);

            Log.e(TAG, "Response from url: " + jsonStr);

            if (jsonStr != null) {
                try {
                    JSONObject jsonObj = new JSONObject(jsonStr);

                    // Getting JSON Array node
                    JSONArray contacts = jsonObj.getJSONArray("MyGeek");

                    // looping through All Contacts
                    for (int i = 0; i < contacts.length(); i++) {
                        JSONObject c = contacts.getJSONObject(i);

                        String id = c.getString("id");
                        String name = c.getString("name");
                        //String email = c.getString("email");
                        //String address = c.getString("address");
                        //String gender = c.getString("gender");

                        // Phone node is JSON Object
                       // JSONObject phone = c.getJSONObject("phone");
                       // String mobile = phone.getString("mobile");
                       // String home = phone.getString("home");
                       // String office = phone.getString("office");

                        countries.add(c.getString("name"));

                    }
                } catch (final JSONException e) {
                    Log.e(TAG, "Json parsing error: " + e.getMessage());
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(getApplicationContext(),
                                    "Json parsing error: " + e.getMessage(),
                                    Toast.LENGTH_LONG)
                                    .show();
                        }
                    });

                }
            } else {
                Log.e(TAG, "Couldn't get json from server.");
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getApplicationContext(),
                                "Couldn't get json from server. Check LogCat for possible errors!",
                                Toast.LENGTH_LONG)
                                .show();
                    }
                });

            }

            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
            pDialog.hide();

            RecyclerView recyclerView = (RecyclerView)findViewById(R.id.card_recycler_view);

            RecyclerView.Adapter adapter = new DataAdapter(countries);
            recyclerView.setAdapter(adapter);

        }


    }
}

Answer 1

不要在Recycler视图上添加单击侦听器，而是尝试在onBindViewHolder方法中的适配器类中添加单击侦听器。这就是你将如何获得执行点击的确切项目。

@Override
public void onBindViewHolder(Viewholder holder, final int position) {
    YourClassObject item = YourClassObjectList.get(position);

    holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Toast.makeText(view.getContext(), "Recycle Click" + position, Toast.LENGTH_SHORT).show();
        }
    });

Answer 2

此链接可以帮助您为recyclerview实现OnItemClick类似的侦听器。

https://antonioleiva.com/recyclerview-listener/

Answer 3

在Adapter类中创建一个接口

public interface EventsCatalogsAdapter{
    void onClickImageCategory(Catalogs catalog);
}

创建EventsCatalogsAdapter的属性

 private EventsCatalogsAdapter event;

创建构造函数

public CatalogsAdapter(EventsCatalogsAdapter event) {
    this.event        = event;
}

在 onBindViewHolder

中添加setOnClickListener

public void onBindViewHolder(final CatalogsViewHolder holder, final int position){
    holder.imageCatalog.setOnClickListener(holder);
}

在你 RecyclerView.ViewHolder 中实现onClickListener事件。

 class CatalogsViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
        private ImageView imageCatalog;
        private TextView tvCatalogName;
        private View vLegendCatalog;

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

            imageCatalog   = (ImageView) itemView.findViewById(R.id.i =vCatalogItem);
            tvCatalogName  = (TextView)itemView.findViewById(R.id.tvCatalogName);
            vLegendCatalog = itemView.findViewById(R.id.vLegendCatalog);

        }

        @Override
        public void onClick(View v) {
            event.onClickImageCategory(catalogsList.get(getAdapterPosition()));
        }
    }

将onClick添加到RecyclerView Android

3 个答案: