Android中自定义适配器BaseAdapter基本用法

效果图：

实现步骤：

1、activity_main4.xml 中写一个ListView

2、Main4Activity 中造一组假数据，并绑定

package rolechina.jremm.com.test4;

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

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

public class Main4Activity extends Activity {

    private ListView listView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main4);
        listView = findViewById(R.id.listView);
        bindAdapter();
    }

    /**
     * 绑定数据
     */
    private void bindAdapter(){
        List list = getData();
        MyItemLayoutAdapter myItemLayoutAdapter = new MyItemLayoutAdapter(list,Main4Activity.this);
        listView.setAdapter(myItemLayoutAdapter);

    }

    /**
     * 造一组假数据
     * @return
     */
    private List getData(){
        Listlist = new ArrayList<>();
        for(int i = 0; i <20 ; i++) {
            list.add("我是条目"+i);

        }
        return list;

    }


}

3、MyItemLayoutAdapter 适配器

/**
 * Created by 16838 on 2019/5/28.
 */
package rolechina.jremm.com.test4;

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.TextView;

/**
 * 适配器
 */
public  class MyItemLayoutAdapter extends BaseAdapter {

//  数据列表
    private List listData ;
//  上下文
    private Context context;

    /**
     * 构造方法
     */
    public MyItemLayoutAdapter(ListlistData,Context context) {
        this.listData = listData;
        this.context = context;

    }

    /**
     * 绑定多少条数据
     */
    @Override
    public int getCount() {
        return listData.size();
    }

    @Override
    public String getItem(int position) {
        return listData.get(position);
    }

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

    /**
     * 绑定数据
     * @param position
     * @param convertView
     * @param parent
     * @return
     */
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder = null;
        if (convertView == null) {
            viewHolder = new ViewHolder();
            convertView = LayoutInflater.from(context).inflate(R.layout.my_item_layout, null);
            viewHolder.textView = convertView.findViewById(R.id.textView);
            convertView.setTag(viewHolder);
        }else{
            viewHolder = (ViewHolder) convertView.getTag();
        }

//      绑定数据
        viewHolder.textView.setText(listData.get(position));
        return convertView;
    }

    /**
     * 缓存类
     */
    class ViewHolder {
        TextView textView;



    }
}

4、my_item_layout.xml布局中

ok,完了

 

如果没有明白，我有个简单demo,免积分下载

http://download.csdn.net/detail/zhaihaohao1/8247185