Android CustomAdapter和ListView

我的代码中一定有遗漏或错误，因此ListView不会显示任何内容

我遵循了这个例子

[我的模型]

package com.example.apinato.layoutexample;

public class MyModel {
    private String name;
    private String surname;
    private String ranking;

    public MyModel(String name, String address, String ranking) {
        this.name = name;
        this.surname = address;
        this.ranking = ranking;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getName() {
        return name;
    }

    public void setSurname(String surname) {
        this.surname = surname;
    }
    public String getSurname() {
        return surname;
    }

    public void setRanking(String ranking) {
        this.surname= ranking;
    }
    public String getRanking() {
        return ranking;
    }

}

[myCustomAdapter]

package com.example.apinato.layoutexample;

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.TextView;


import java.util.ArrayList;
import java.util.List;

public class MyCustomAdapter extends ArrayAdapter {
    private final Context context;
    private final List list;


    public MyCustomAdapter(Context context, int position, ArrayList<com.example.apinato.layoutexample.MyModel> list) {
        super(context, position);
        this.context = context;
        this.list = list;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View rowView = convertView;


        // Get a new instance of the row layout view
        LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
        rowView = inflater.inflate(R.layout.row, parent, false);


        TextView _name = (TextView) rowView.findViewById(R.id.titoloriga1);
        TextView _surname = (TextView) rowView.findViewById(R.id.descrizioneriga1);
        TextView _ranking = (TextView) rowView.findViewById(R.id.ranking1);

        //added according to your suggestions    
        com.example.apinato.layoutexample.MyModel myModel = (com.example.apinato.layoutexample.MyModel) list.get(position);

        _name.setText(myModel.getName());
        _surname .setText(myModel.getName());
        _ranking .setText(myModel.getName());

        return rowView;
    }

}

package com.example.apinato.layoutexample；
导入android.app.Activity；
导入android.content.Context；
导入android.view.LayoutInflater；
导入android.view.view；
导入android.view.ViewGroup；
导入android.widget.ArrayAdapter；
导入android.widget.TextView；
导入java.util.ArrayList；
导入java.util.List；
公共类MyCustomAdapter扩展了ArrayAdapter{
私人最终语境；
私人最终名单；
公共MyCustomAdapter（上下文、int位置、ArrayList列表）{
超级（上下文、位置）；
this.context=上下文；
this.list=列表；
}
@凌驾
公共视图getView（int位置、视图转换视图、视图组父视图）{
视图行视图=转换视图；
//获取行布局视图的新实例
LayoutFlater充气器=（LayoutFlater）context.getSystemService（context.LAYOUT\u充气器\u服务）；
rowView=充气机。充气（R.layout.row，父级，false）；
TextView _name=（TextView）rowView.findViewById（R.id.titoloriga1）；
TextView _姓氏=（TextView）rowView.findViewById（R.id.descripioneriga1）；
TextView _ranking=（TextView）rowView.findViewById（R.id.ranking1）；
//根据您的建议添加
com.example.apinato.layoutexample.MyModel MyModel=（com.example.apinato.layoutexample.MyModel）list.get（位置）；
_name.setText（myModel.getName（））；
_setText（myModel.getName（））；
_setText（myModel.getName（））；
返回行视图；
}
}

[我的活动]

package com.example.apinato.layoutexample;

import android.app.Activity;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


public class MainActivity extends Activity {

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

        final ListView listview = (ListView) findViewById(R.id.listview);

        ArrayList<com.example.apinato.layoutexample.MyModel> list = new ArrayList<com.example.apinato.layoutexample.MyModel>();
        list.add(new com.example.apinato.layoutexample.MyModel("aaaaa1","aaaaa1","2"));
        list.add(new com.example.apinato.layoutexample.MyModel("bbbbb2","bbbbb2","3"));
        list.add(new com.example.apinato.layoutexample.MyModel("ccccc3","ccccc3","1"));
        list.add(new com.example.apinato.layoutexample.MyModel("ddddd4", "ddddd4", "5"));
        list.add(new com.example.apinato.layoutexample.MyModel("ccccc5", "ccccc5", "4"));

        final com.example.apinato.layoutexample.MyCustomAdapter adapter = new com.example.apinato.layoutexample.MyCustomAdapter(this, R.layout.row, list);
        listview.setAdapter(adapter);


    }
}

package com.example.apinato.layoutexample；
导入android.app.Activity；
导入android.content.Context；
导入android.support.v7.app.AppActivity；
导入android.os.Bundle；
导入android.view.LayoutInflater；
导入android.view.view；
导入android.view.ViewGroup；
导入android.widget.Adapter；
导入android.widget.AdapterView；
导入android.widget.ArrayAdapter；
导入android.widget.ImageView；
导入android.widget.ListView；
导入android.widget.simpledapter；
导入android.widget.TextView；
导入java.util.ArrayList；
导入java.util.HashMap；
导入java.util.List；
导入java.util.Map；
公共类MainActivity扩展了活动{
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
最终ListView ListView=（ListView）findViewById（R.id.ListView）；
ArrayList=新建ArrayList（）；
添加（新的com.example.apinato.layoutexample.MyModel（“AAAA1”、“AAAA1”、“2”））；
添加（新的com.example.apinato.layoutexample.MyModel（“bbbbb2”、“bbbbb2”、“3”））；
添加（新的com.example.apinato.layoutexample.MyModel（“CCCC3”、“CCCC3”、“1”））；
add（new com.example.apinato.layoutexample.MyModel（“ddd4”、“ddd4”、“5”））；
添加（新的com.example.apinato.layoutexample.MyModel（“ccccc5”、“ccccc5”、“4”）；
final com.example.apinato.layoutexample.MyCustomAdapter adapter=new com.example.apinato.layoutexample.MyCustomAdapter（此，R.layout.row，列表）；
setAdapter（适配器）；
}
}

[行的布局]（未显示活动的布局）

试试这个：

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View rowView = convertView;


        // Get a new instance of the row layout view
        LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
        rowView = inflater.inflate(R.layout.row, parent, false);


        TextView _name = (TextView) rowView.findViewById(R.id.titoloriga1);
        TextView _surname = (TextView) rowView.findViewById(R.id.descrizioneriga1);
        TextView _ranking = (TextView) rowView.findViewById(R.id.ranking1);

        MyModel myModel = list.get(position);

        _name.setText(myModel.getName()); 
        _surname .setText(myModel..getSureName());
        _ranking .setText(myModel.getRanking());

        return rowView;
    }

---

将这些行添加到

getView（）

方法中，您缺少设置属性值的功能，正如Blackbelt所说

_name.setText(list.get(position).getName()));
_surname.setText(list.get(position).getSureName()));
_ranking.setText(list.get(position).getRanking());

---

更改您的自定义适配器

@Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View rowView = convertView;


        // Get a new instance of the row layout view
        LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
        rowView = inflater.inflate(R.layout.row, parent, false);


        TextView _name = (TextView) rowView.findViewById(R.id.titoloriga1);
        TextView _surname = (TextView) rowView.findViewById(R.id.descrizioneriga1);
        TextView _ranking = (TextView) rowView.findViewById(R.id.ranking1);
        _name.setText(list.get(position).getName());
        _surname.setText(list.get(position).getSurname());
        _ranking.setText(list.get(position)getRanking());
        return rowView;
    }

---

GetView中缺少

\u name.setText（）

。在自定义适配器中，您没有为

\u name、\u姓氏和\u排名设置值，因此它不会显示任何内容，并且在添加这些内容后仍然不起作用？您缺少适配器中的实现getCount。默认情况下，此方法返回0，这意味着您的适配器有0项。是否也可以在列表中显示drawable？
@Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View rowView = convertView;


        // Get a new instance of the row layout view
        LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
        rowView = inflater.inflate(R.layout.row, parent, false);


        TextView _name = (TextView) rowView.findViewById(R.id.titoloriga1);
        TextView _surname = (TextView) rowView.findViewById(R.id.descrizioneriga1);
        TextView _ranking = (TextView) rowView.findViewById(R.id.ranking1);
        _name.setText(list.get(position).getName());
        _surname.setText(list.get(position).getSurname());
        _ranking.setText(list.get(position)getRanking());
        return rowView;
    }