Android之自定义适配器

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.android_listview_adapter.MainActivity" >

<!-- ListView一定要让属性设置为 android:layout_height="match_parent"-->
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true" >

</ListView>

</RelativeLayout>

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

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:textColor="#FF8000"
/>

</LinearLayout>

package com.example.android_listview_adapter;

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

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

private ListView listView;
private MyAdapter myAdapter;//自定义适配器
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView=(ListView) this.findViewById(R.id.listView1);
myAdapter=new MyAdapter(getData());//把数据加进去
listView.setAdapter(myAdapter);
}

public List<String> getData(){
List<String> list=new ArrayList<String>();
for(int i=0;i<100;i++){
list.add("ccnu"+i);
}
return list;
}

/**
*
* @author liuya
*
*一个基本的适配器有四个属性getCount，getItem，getItemId，getView
*/
//由于json数据太复杂，所以要自定义适配器，声明适配器的类
public class MyAdapter extends BaseAdapter{

private List<String> list;

//构造方法，通过构造方法传递参数
public MyAdapter(List<String> list) {
// TODO Auto-generated constructor stub
this.list=list;
}

@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();//得到适配器中填充的集合的个数，即是适配器的个数
}

@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);//得到数据集的选项
}

@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
View view=LayoutInflater.from(MainActivity.this).inflate(R.layout.items, null);//手工加载一个布局
TextView textView=(TextView) view.findViewById(R.id.textView1);//把items.xml中的TextView加载到页面
textView.setText(list.get(position));
System.out.println("---->>"+position);
return view;
}

}

@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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}