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我制作了一个自定义 ArrayAdapter，但它没有在列表的每一行中显示不同的图像。它只显示文本而不显示来自服务器的图像。这是代码：自定义适配器：

package com.findadoc;

import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class doctorslistAdapter extends ArrayAdapter<Doctors> {
    Context context;
    int layoutResource;
    Doctors[]objects=null;
    public doctorslistAdapter(Context context, int resource, Doctors[] objects) {
        super(context, resource, objects);
        this.context=context;
        this.layoutResource=resource;
        this.objects=objects;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View v=convertView;
        DoctorsHolder holder;
        if(v==null){
            LayoutInflater inflater=((Activity)context).getLayoutInflater();
            v=inflater.inflate(layoutResource, parent, false);
            holder=new DoctorsHolder();
            holder.doc_icon=(ImageView)v.findViewById(R.id.imageViewdocimg);
            holder.doc_name=(TextView)v.findViewById(R.id.textViewdocname);
            holder.specialization=(TextView)v.findViewById(R.id.textViewspecialization);
            v.setTag(holder);
        }
        else
        {
            holder=(DoctorsHolder)v.getTag();
        }
        Doctors doc=objects[position];
        holder.doc_icon.setImageBitmap(doc.bitmap);
        holder.doc_name.setText(doc.doc_name);
        holder.specialization.setText(doc.specialization);
        return v;
    }
    static class DoctorsHolder{
        ImageView doc_icon;
        TextView doc_name,specialization;
    }
}

医生班：

package com.findadoc;

import java.io.BufferedInputStream;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;

public class Doctors {
    public String doc_name,specialization;
    public Bitmap bitmap;
    public Doctors(String icon,String doc_name,String specialization){
        this.doc_name=doc_name;
        this.specialization=specialization;
        (new bitmapclass(icon)).execute();
    }
    class bitmapclass extends AsyncTask<Void, Void, Void>{
        public String icon_url;
        public Bitmap bm = null;
        public bitmapclass(String icon_url){
            this.icon_url=icon_url;
        }
        @Override
        protected Void doInBackground(Void... arg0) {
             try {
                    URL aURL = new URL("http://10.0.2.2/findadoc/images/"+this.icon_url);
                    URLConnection conn = aURL.openConnection();
                    conn.connect();
                    InputStream is = conn.getInputStream();
                    BufferedInputStream bis = new BufferedInputStream(is, conn.getContentLength());
                    bm = BitmapFactory.decodeStream(bis);
                    bis.close();
                    is.close();
               } catch (Exception e) {
                    e.printStackTrace();
               }
            return null;
        }
        @Override
        protected void onPostExecute(Void result) {
            Doctors.this.bitmap=bm;
            super.onPostExecute(result);
        }
    }
}

主要课程：

package com.findadoc;

import java.io.BufferedInputStream;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

import com.findadoc.Doctors.bitmapclass;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.ListView;

public class doctorsActivity extends Activity {
    ListView listviewdocs;
    ImageView imageview;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.doctorsactivity);
        imageview=(ImageView)findViewById(R.id.imageViewtest);
        Doctors d=new Doctors("doc1.png", "", "");
        imageview.setImageBitmap(d.bitmap);
        listviewdocs=(ListView)findViewById(R.id.listViewDoctors);
        Doctors doctors_data[]=new Doctors[]{
                new Doctors("doc1.png", "Dr. Sammy Kulova","Gyaenacologist"),
                new Doctors("doc2.png","Dr.Joan Kulova","Paediatrician"),
                new Doctors("doc3.png","Dr. John Kulova","Pharmacist")
        };
        listviewdocs.setAdapter(new doctorslistAdapter(doctorsActivity.this, R.layout.doctors_list_item_row, doctors_data));
    }
}
4

1 回答 1

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你的 XML 文件在哪里，你必须使用一个 xml 文件，你必须在其中将 listview 的内容指定为 ImageView 和 TextView。并且该 XML 文件进入getView()适配器类中的这一行

（假设是 list_row.xml）

v=inflater.inflate(R.layout.list_row, parent, false);
于 2012-07-25T07:59:55.747 回答