java - 如何在从 Web 服务器接收图标 URL 时将图标添加到自定义 ListView 中

Question

如何在从 Web 服务器接收图标 URL 时将图标添加到自定义 ListView 中。我想在 ListView 中添加图标而不是网址。我是新人，请帮助我，这是我的代码

这是我在服务器上的 json 文件。

   {"status": 200,"status_message":"Success","response":
  [{"platform":0,"logo":"http:\/\/betfan.com\/images\/servicelogo\/258.png",
  "name":"Andy Bell Racing","oppid":"258","hadtip":0},
  {"platform":0,"logo":"http:\/\/betfan.com\/images\/servicelogo\/327.png",
  "name":"Dog Race Wagers","oppid":"327","hadtip":0}]}

欢迎.java

 package com.example.newapp;

 package com.example.newapp;
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.UnsupportedEncodingException;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.ArrayList;
 import java.util.List;
 import org.apache.http.HttpEntity;
 import org.apache.http.HttpResponse;
 import org.apache.http.NameValuePair;
 import org.apache.http.client.ClientProtocolException;
 import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.impl.client.DefaultHttpClient;
 import org.apache.http.message.BasicNameValuePair;
 import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 import android.app.Activity;
 import android.app.Dialog;
 import android.app.ProgressDialog;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemClickListener;
 import android.widget.ListView;
 import android.widget.Toast;

 public class Welcome extends Activity {

String[] temp_Arr;
ListView lv;
ArrayList<list>listitem;
String title;



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

    login();

    title="Free Tip - Betfans";

    lv=(ListView) findViewById(R.id.lvID);
    listitem=new ArrayList<list>();
}
private void login() {

    class LoginAsync extends AsyncTask<String, Void, String>{

        private Dialog loadingDialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            loadingDialog = ProgressDialog.show(Welcome .this, "Please while wait", "Loading...");
        }

        @Override
        protected String doInBackground(String... params) {



            JSONObject jsonObject = new JSONObject();

            try {
                jsonObject.accumulate("device", "de3b5e2d7f401829ea54fd5aca9d2fa92deb65c1b9b6b7729b3c3c8df11e75f4");

            } catch (JSONException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }

            try {
                jsonObject.accumulate("userID", "2385");
            } catch (JSONException e2) {
                // TODO Auto-generated catch block
                e2.printStackTrace();
            }
                 try {
                    jsonObject.accumulate("userkey", "d69b87b2c0ad828bf7c0c30b83ea0c11");
                } catch (JSONException e3) {
                    // TODO Auto-generated catch block
                    e3.printStackTrace();
                }

            try {
                jsonObject.accumulate("key", "MEu07MgiuWgXwJOo7Oe1aHL0yM8VvP");
            } catch (JSONException e4) {
                // TODO Auto-generated catch block
                e4.printStackTrace();
            }
          // 4. convert JSONObject to JSON to String
            String dataString = jsonObject.toString();

            InputStream is = null;
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
            nameValuePairs.add(new BasicNameValuePair("data", dataString));

            String result = null;

            try{


                HttpClient httpClient = new DefaultHttpClient();
                HttpGet httpRequest = new HttpGet();

                URI apiurl = new URI("http://mobile.betfan.com/api/?action=v2list&device=de3b5e2d7f401829ea54fd5aca9d2fa92deb65c1b9b6b7729b3c3c8df11e75f4&key=MEu07MgiuWgXwJOo7Oe1aHL0yM8VvP&userID=2385&userkey=d69b87b2c0ad828bf7c0c30b83ea0c11");

                httpRequest.setURI(apiurl);

                HttpResponse response = httpClient.execute(httpRequest);

                HttpEntity entity = response.getEntity();

                is = entity.getContent();

                BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"), 8);
                StringBuilder sb = new StringBuilder();

                String line = null;
                while ((line = reader.readLine()) != null)
                {
                    sb.append(line + "\n");
                }
                result = sb.toString();
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (URISyntaxException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return result;
        }

        protected void onPostExecute(String result){
            String s = result.trim();
            //Toast.makeText(Welcome.this, s, Toast.LENGTH_LONG).show();
          Toast.makeText(Welcome.this, "Services received!", Toast.LENGTH_LONG).show();

            loadingDialog.dismiss();

                JSONObject respObject;
                try {
                    respObject = new JSONObject(s);
                    String active = respObject.getString("status_message");

                    //boolean status = respObject.getBoolean("status_message");

                    if(active.equalsIgnoreCase("success")){
                         JSONArray array = respObject.getJSONArray("response");
                            for (int i =0; i<array.length();i++){

                         JSONObject jsonObject = array.getJSONObject(i);
                         String logo= jsonObject.getString("logo");
                         String name= jsonObject.getString("name");
                         String hadtip = jsonObject.getString("hadtip");
                         String tipstr="";
                        if(hadtip.equalsIgnoreCase("1")){
                             tipstr = "Today's Tips ready.";
                        }else{
                             tipstr = "No Today's Tips";
                        }

                          listitem.add(new list((1),name, tipstr));
            //1 is any dummy integer because when i pass logo it gives error and application get crashed.
                        }
                         lv.setAdapter(new Custom_adapter(Welcome.this, listitem)); 

                    }else {
                        Toast.makeText(getApplicationContext(), "services received Fail", Toast.LENGTH_LONG).show();

                    }

                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

                lv.setOnItemClickListener(new OnItemClickListener() {

                    @Override
                    public void onItemClick(AdapterView<?> arg0, View arg1,
                            int arg2, long arg3) {
                        // TODO Auto-generated method stub
                        String strName = listitem.get(arg2).getname();

                        Toast.makeText(Welcome.this, strName, Toast.LENGTH_LONG)
                        .show();

                    }
                });

        }

    }

    LoginAsync la = new LoginAsync();
    la.execute();

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
 }
}

这是 Activitywelcome.xml 代码

  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/LinearLayout1"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="horizontal">

  <ListView
      android:id="@+id/lvID"
      android:layout_width="match_parent"
      android:layout_height="wrap_content" >

</ListView>

列表.java

package com.example.newapp;

public class list {
private int icon;
private String name;
private String tips;


public int getIcon() {
    return icon;
}
public void setIcon(int icon) {
    this.icon = icon;
}
public String getname() {
    return name;
}
public void setname(String name) {
    this.name = name;
}
public String getTips() {
    return tips;
}
public void setTips(String tips) {
    this.tips = tips;
}
public list(int icon, String name, String tips) {
    super();
    this.icon = icon;
    this.name = name;
    this.tips = tips;
 }



}

自定义适配器.java

  package com.example.newapp;

 import java.util.ArrayList;
 import java.util.List;
 import android.content.Context;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.ImageView;
 import android.widget.TextView;
 import com.squareup.picasso.Picasso;

public class Custom_adapter extends BaseAdapter{
Context context;
ArrayList<list>mylist;
public Custom_adapter(Context context, ArrayList<list> mylist) {
super();
this.context = context;
this.mylist = mylist;
 }

@Override
public int getCount() {
// TODO Auto-generated method stub
return mylist.size();
}

@Override
public Object getItem(int  position) {
// TODO Auto-generated method stub
return position;
}

@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if(convertView==null){
    LayoutInflater inflater=(LayoutInflater)    context.getSystemService(context.LAYOUT_INFLATER_SERVICE);

    convertView=inflater.inflate(R.layout.activity_custom_adapter,null);
    ImageView icon=(ImageView)convertView.findViewById(R.id.iconID);
    TextView title=(TextView) convertView.findViewById(R.id.txt_titleID);
    TextView tips=(TextView) convertView.findViewById(R.id.txt_tipsID);


    list list=mylist.get(position);
    Picasso.with(context).load(list.getIcon()).into(icon);
    title.setText(list.getname());
    tips.setText(list.getTips());

  }
  return convertView;
 }
}

Acitvity_custom_adapter.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">

 <ImageView
     android:id="@+id/iconID"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:src="@drawable/ic_launcher" />

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/txt_titleID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="110dp"
        android:text="TextView" />

    <TextView
        android:id="@+id/txt_tipsID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="110dp"
        android:layout_marginTop="5dp"
        android:text="TextView" />

</LinearLayout>

请任何人帮助我，除了图标之外，所有代码都工作正常，当我收到图标 URL 时，图标没有添加到 ListView 中，但我不知道如何在此 URL 后面添加图标。感谢大家告诉我我做什么并给我写一些代码，谢谢。

Answer 1

您的代码中的这一行似乎有一些错误:

listitem.add(new list((1),name,tipstr));

这里的“(1)”是什么，您应该传递从 json 响应解析的 logo，例如

listitem.add(new list(logo,name,tipstr));

如果这不能帮助检查 list.getIcon() 是否包含 logo 网址，

编辑，

您应该更新您的 Model 类以接受 String 而不是 int 作为 的 Url Logo 将是 String

因此，请在模型类中进行以下更改

String icon;
public String getIcon() {
    return icon;
}
public void setIcon(String icon) {
    this.icon = icon;
}

public list(String icon, String name, String tips) {
    super();
    this.icon = icon;
    this.name = name;
    this.tips = tips;
}

这应该可以解决问题，