适配器 Adapter

<pre name="code" class="java">package com.example.adapter;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

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

ListView listview = (ListView) findViewById(R.id.listView);
ArrayAdapter adapter = new MyAdapter(this,-1);
listview.setAdapter(adapter);
}

private class MyAdapter extends ArrayAdapter{

private String [] data;
private LayoutInflater inflater = null;

public MyAdapter(Context context, int resource) {
super(context,resource);

data=new String [20];
for(int i=0;i<data.length;i++){
data [i]="数据"+i;
}
inflater=LayoutInflater.from(context);
}

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

Log.d("getView",position+"");

if(convertView == null){

Log.d("convertView","convertView==null 需要创建新的View");

convertView = inflater.inflate(R.layout.item,null);
}else{
Log.d("convertView","复用");

}

//View view = inflater.inflate(R.layout.item,null);

TextView text = (TextView) convertView.findViewById(R.id.textView1);
text.setText(data[position]);

TextView text2 = (TextView) convertView.findViewById(R.id.textView2);

text2.setText("pos="+position);

return convertView;
}

@Override
public int getCount() {

return data.length;
}

}
}

<pre name="code" class="java"><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"tools:context="com.example.adapter.MainActivity" ><ListViewandroid:id="@+id/listView"android:layout_width="match_parent"android:layout_height="match_parent"></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" ><TextViewandroid:id="@+id/textView1"android:textSize="12sp"android:padding="10dip"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="没有数据1" /><TextViewandroid:id="@+id/textView2"android:textSize="10sp"android:padding="10dip"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="没有数据2" /></LinearLayout>