如何在Android中将多个ArrayList传递给BaseAdapter？

Question

我试图传递一些动态数据来BaseAdapter显示它listview.(使用ArrayList),我当前的代码给我以下错误:

错误:

error: cannot find symbol variable ArrayList
error: cannot find symbol variable String

指向这部分代码(ArrayList <String>):

CustomAdapter customAdapter = new CustomAdapter(getApplicationContext(), ArrayList<String> NameArrayList, ArrayList<String> IconArrayList);

我检查了Arraylist大小,发现IconArrayList和NameArrayList不是空的,使用int itemCount = IconArrayList.size();

但是如果我将下面的静态字符串数组传递给Baseadapter,那么它会在listview上显示数据!

String NameArrayList[] = {"USA", "China", "australia", "Portugle", "Norway", "NewZealand"};
String IconArrayList[] = {"http://awebsite.com/icons/usa.png", "http://awebsite.com/icons/china.png", "http://awebsite.com/icons/australia.png", "http://awebsite.com/icons/portugle.png", "http://awebsite.com/icons/norway.png", "http://awebsite.com/icons/new_zealand.png"};

CustomAdapter customAdapter = new CustomAdapter(getApplicationContext(), NameArrayList, IconArrayList);

你能帮助我解决上面的错误并成功地将arraylist传递给baseAdapter,以便显示它.谢谢你提前.

MainActivity.java:

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;

import android.view.View;
import android.widget.AdapterView;
import android.widget.Toast;

import android.os.StrictMode;
import android.os.StrictMode.ThreadPolicy.Builder;

import java.io.InputStreamReader;

import java.net.URL;
import java.net.HttpURLConnection;
import java.io.OutputStream;
import java.io.BufferedReader;

import java.util.ArrayList;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        sendGetRequest();

     }


public String sendGetRequest() {

         String NEW_ICON = "icon";


        ArrayList<String> IconArrayList =new ArrayList<String>();
        ArrayList<String> NameArrayList =new ArrayList<String>();
        ArrayList<String> UrlArrayList =new ArrayList<String>();


        try {

            StrictMode.setThreadPolicy(new Builder().permitAll().build());

            HttpURLConnection myURLConnection = (HttpURLConnection) new URL("http://awebsite.com/test/test.php").openConnection();


            myURLConnection.setReadTimeout(60000);
            myURLConnection.setConnectTimeout(60000);
            myURLConnection.setRequestMethod("GET");
            myURLConnection.setUseCaches(false);
            myURLConnection.setDoInput(true);
            myURLConnection.setDoOutput(true);
            myURLConnection.setRequestProperty("Content-Type", "html");
            myURLConnection.setRequestProperty("User-Agent", "Dalvik/2.1.0 (Linux; U; Android 6.0;)");

            OutputStream os = myURLConnection.getOutputStream();

            os.close();

            myURLConnection.connect();

            BufferedReader in = new BufferedReader(new InputStreamReader(myURLConnection.getInputStream()));


            StringBuffer sb = new StringBuffer();

            String line;


            while ((line = in.readLine()) != null) {

                sb.append(line);
                sb.append("\\n");
            }
            in.close();



            String linesArray[] = sb.toString().split("#MYLIST:");

            for (int i = 0; i < linesArray.length; i++) {
                String currLine = linesArray[i];


                String[] dataArray = currLine.split(",");

                if (dataArray[0].contains(NEW_ICON)) {

                   String s =dataArray[0];

                    s = s.substring(s.indexOf("(") + 1);
                    s = s.substring(0, s.indexOf(")"));


                    IconArrayList.add(s);



                    if (dataArray[1].contains("http://")) {
                        String[] split = dataArray[1].split("http://");
                        String name = split[0];
                        String url = split[1];
                        url ="http://"+url;

                        //adding name and url to arraylist
                        NameArrayList.add(name);
                        UrlArrayList.add(url);
                      }


                }



            }// end of for loop

            //showing array list total
            int itemCount = IconArrayList.size();
            int itemCount2 = NameArrayList.size();
            int itemCount3 = UrlArrayList.size();


            ListView simpleList;
            simpleList = (ListView) findViewById(R.id.simpleListView);
            CustomAdapter customAdapter = new CustomAdapter(getApplicationContext(), ArrayList<String> NameArrayList, ArrayList<String> IconArrayList);
            simpleList.setAdapter(customAdapter);


        } catch (Exception e) {

        }
        return null;

    }

BaseAdapter:

public class CustomAdapter extends BaseAdapter {
    Context context;
    String countryList[];

    String flags[];

    LayoutInflater inflter;

    public CustomAdapter(Context applicationContext, String[] countryList, String[] flags) {
        this.context = context;
        this.countryList = countryList;
        this.flags = flags;
        inflter = (LayoutInflater.from(applicationContext));
    }

    @Override
    public int getCount() {
        return countryList.length;
    }

    @Override
    public Object getItem(int i) {
        return null;
    }

    @Override
    public long getItemId(int i) {
        return 0;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        view = inflter.inflate(R.layout.activity_listview, null);
        TextView country = (TextView) view.findViewById(R.id.textView);
        ImageView icon = (ImageView) view.findViewById(R.id.icon);
        country.setText(countryList[i]);

        Picasso.with(view.getContext())
                .load(flags[i])
                //.resize(50,50)
                .into(icon);

        return view;
    }
}

Answer 1

你正在发送 WRONG TYPE

CustomAdapter customAdapter = new CustomAdapter(getApplicationContext(), ArrayList<String> NameArrayList, ArrayList<String> IconArrayList);

这将是

 CustomAdapter customAdapter = new CustomAdapter(getApplicationContext(),  NameArrayList,  IconArrayList);

所以,你Constructor 会的

ArrayList<String> countryList;
ArrayList<String> flags;

public CustomAdapter(Context applicationContext,ArrayList<String> countryListOBJ, ArrayList<String> flagsOBJ) {
        this.context = context;
        this.countryList = countryListOBJ;
        this.flags = flagsOBJ;
        inflter = (LayoutInflater.from(applicationContext));
    }

然后

 @Override
    public int getCount() {
        return countryList.size();
    }