关于自定义Adapter实现ListView的使用

以下为使用BaseAdapter作扩展，自定义Adapter来使用ListView控件：

需要注意以下的几点：

1、自定义Adapter时，需要特别注意Adapter类中getView()方法覆盖，注意加载布局文件和加载控件的区别；

2、自定义好Adapter后，在Activity中实现ListView的过程：

（1）生成Adapter对象（注意传入一个list表），并将Adapter对象作为ListView的适配器

ListViewAdapter adapter = new ListViewAdapter(getApplicationContext(),list); listView.setAdapter(adapter);
　　 （2）当list发生改动的时候，需要使用adapter.notifyDataSetChanged();
3、在Adapter的getView（）时，使用LayoutInflater.Inflate()方法加载布局，findViewByID（）加载控件；

项目包含的文件如下：

结果如下：

1、输入数字时候为第一种布局

2、输入文本的时候为第二种布局

完整代码如下

Adapter类：

package com.example.testlistview;

import java.util.List;

import android.content.Context;
import android.content.res.ColorStateList;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

public class ListViewAdapter extends BaseAdapter {
private Context context;
private LayoutInflater listContainer;
private List<String> listItems;

private TextView textView1;
private TextView textView2;
private Button button1;
private Button button2;

public ListViewAdapter(Context context,List<String> list) {
// TODO Auto-generated constructor stub
this.context = context;
this.listItems = list;
this.listContainer = LayoutInflater.from(context);
}

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

@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}

@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
String str = listItems.get(position).toString();
if(isNum(str)==false){
convertView = listContainer.inflate(R.layout.list_item_layout2, null);
textView1 = (TextView)convertView.findViewById(R.id.textView1);
textView2 = (TextView)convertView.findViewById(R.id.textView2);
button1 = (Button)convertView.findViewById(R.id.button1);
button2 = (Button)convertView.findViewById(R.id.button2);
textView1.setText(listItems.get(position));
textView1.setTextColor(Color.BLACK);
textView2.setText(listItems.get(position));
textView2.setTextColor(Color.BLACK);
button1.setText(listItems.get(position));
button2.setText(listItems.get(position));
return convertView;
}else {
convertView = listContainer.inflate(R.layout.list_item_layout1, null);
textView1 = (TextView)convertView.findViewById(R.id.textView1);
textView2 = (TextView)convertView.findViewById(R.id.textView2);
textView1.setText(listItems.get(position));
textView1.setTextColor(Color.BLACK);
textView2.setText(listItems.get(position));
textView2.setTextColor(Color.BLACK);
return convertView;
}
}

public static boolean isNum(String str){
return str.matches("^[-+]?(([0-9]+)([.]([0-9]+))?|([.]([0-9]+))?)$");
}

}

//Activity类

package com.example.testlistview;

import java.util.ArrayList;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;

public class ListViewActivity extends ActionBarActivity {
private ListView listView;
private Button btn;
private EditText edt;
private ListViewAdapter adapter;
private ArrayList<String> list = new ArrayList<String>();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_view);
listView = (ListView)findViewById(R.id.listView1);
btn = (Button)findViewById(R.id.button1);
edt = (EditText)findViewById(R.id.editText1);
adapter = new ListViewAdapter(getApplicationContext(),list);
listView.setAdapter(adapter);

btn.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
list.add(edt.getText().toString());
adapter.notifyDataSetChanged();
}
});
}

}

主布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="312dp" >
</ListView>

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >

<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10" >

<requestFocus />
</EditText>

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="提交" />

</LinearLayout>

</LinearLayout>

layout1布局：

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:orientation="horizontal" >

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="0.5"
android:text="TextView" />

<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="0.5"
android:text="TextView" />

</LinearLayout>

layout2布局：

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="0.3"
android:gravity="center"
android:text="detail" />

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.4"
android:gravity="center"
android:orientation="vertical" >

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="layout1" />

<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="layout2" />

</LinearLayout>

<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="0.3"
android:gravity="center"
android:text="state" />

</LinearLayout>