Android自定义ListView

android

实现自定义Adapter

首先需要自定义一个adapter类，继承BaseAdapter，具体如下：

class ViewHolder
    {
        public ImageView imageView;
        public TextView textView;
        public Button button;
    }
    class MyAdapter extends BaseAdapter
    {
        private LayoutInflater inflater;
        public MyAdapter(Context context)
        {
            inflater = LayoutInflater.from(context);
        }
        @Override
        public int getCount() {
            return data.size();
        }
        @Override
        public Object getItem(int location) {
            return data.get(location);
        }
        @Override
        public long getItemId(int position) {
            return 0;
        }
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder = null;
            if (convertView == null)
            {
                holder = new ViewHolder();
                convertView = inflater.inflate(R.layout.list_item, null);
                holder.imageView = (ImageView) convertView.findViewById(R.id.img);
                holder.textView = (TextView) convertView.findViewById(R.id.text);
                holder.button = (Button) convertView.findViewById(R.id.button);
                convertView.setTag(holder);
            }
            else {
                holder = (ViewHolder) convertView.getTag();
            }
            holder.imageView.setImageResource((Integer)data.get(position).get("img"));
            holder.textView.setText(data.get(position).get("info").toString());
            final int p = position;
            holder.button.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(getApplicationContext(), String.valueOf(p), Toast.LENGTH_LONG).show();
                }
            });
            return convertView;
        }
    }

自定义布局文件

然后，需要自定义一个xml文件，即list_item的布局文件，如下：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/bg"
    android:clickable="true">
    <LinearLayout 
        android:layout_width="fill_parent"
        android:layout_height="50dip"
        android:orientation="horizontal"
        android:layout_alignParentLeft="true"
        android:gravity="center_vertical">
        <ImageView 
            android:id="@+id/img"
            android:layout_width="30dip"
            android:layout_height="30dip"
            android:scaleType="centerInside"
            android:src="@drawable/ic_launcher"
            />
        <TextView 
            android:id="@+id/text"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:text="hello"
            android:textSize="16sp"
            android:textColor="#ccc"
            android:gravity="center_vertical"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="10dip"/>
    </LinearLayout>
    <Button 
        android:id="@+id/button"
        android:text="Button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:layout_alignParentRight="true"/>
</RelativeLayout>

整个完整代码如下：

package com.lwz.activity;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.example.testandroid.R;
public class MainActivity extends Activity {
    private ListView list;
    private List<Map<String, Object>> data; 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
    }
    public void init()
    {
        list = (ListView) findViewById(R.id.list1);
        // set data
        data = new ArrayList<Map<String,Object>>();
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("img", R.drawable.ic_launcher);
        map.put("info", "hello");
        data.add(map);
        MyAdapter adapter = new MyAdapter(this);
        list.setAdapter(adapter);
        list.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
                Toast.makeText(getApplicationContext(), "click" + arg2, Toast.LENGTH_LONG).show();
            }
        });
    }
    class ViewHolder
    {
        public ImageView imageView;
        public TextView textView;
        public Button button;
    }
    class MyAdapter extends BaseAdapter
    {
        private LayoutInflater inflater;
        public MyAdapter(Context context)
        {
            inflater = LayoutInflater.from(context);
        }
        @Override
        public int getCount() {
            return data.size();
        }
        @Override
        public Object getItem(int location) {
            return data.get(location);
        }
        @Override
        public long getItemId(int position) {
            return 0;
        }
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder = null;
            if (convertView == null)
            {
                holder = new ViewHolder();
                convertView = inflater.inflate(R.layout.list_item, null);
                holder.imageView = (ImageView) convertView.findViewById(R.id.img);
                holder.textView = (TextView) convertView.findViewById(R.id.text);
                holder.button = (Button) convertView.findViewById(R.id.button);
                convertView.setTag(holder);
            }
            else {
                holder = (ViewHolder) convertView.getTag();
            }
            holder.imageView.setImageResource((Integer)data.get(position).get("img"));
            holder.textView.setText(data.get(position).get("info").toString());
            final int p = position;
            holder.button.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(getApplicationContext(), String.valueOf(p), Toast.LENGTH_LONG).show();
                }
            });
            return convertView;
        }
    }
}

注：这是自己的笔记，仅供参考