package com.sbs.aas2l;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.ListView;import android.widget.TextView;import android.widget.AdapterView.OnItemClickListener;public class aas2l extends Activity implements OnClickListener {    /** Called when the activity is first created. */private String[] data= http://www.mamicode.com/{"Item-1", "Item-2", "Item-3"};private Button btn, btn2;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //setContentView(R.layout.main);        set_aas2l_layout();    }    public void set_aas2l_layout() {     setContentView(R.layout.aas2l);     btn = (Button)findViewById(R.id.pu_btn);     btn.setOnClickListener(this);     btn2 = (Button)findViewById(R.id.exit_btn);     btn2.setOnClickListener(this);     }    public void onClick(View v){     if (v == btn) this.set_pu_layout();     if(v == btn2) this.finish(); }     public void set_pu_layout(){     setContentView(R.layout.pickup);     ListView lv = (ListView)findViewById(R.id.list);     ArrayAdapter<String> arrayAdapter     = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, data);     lv.setAdapter(arrayAdapter);     lv.setOnItemClickListener(listener);    }    OnItemClickListener listener= new OnItemClickListener(){     public void onItemClick(AdapterView arg0, View arg1, int arg2, long arg3){      set_aas2l_layout();      TextView tv = (TextView)findViewById(R.id.tv);      tv.setText("select: " + data[arg2]);     }    };}

step3。编写ass2l.xml (当然也可以在main.xml中写，这次我新建一个。）<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="wrap_content"><TextView android:id= "@+id/tv"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginRight="3dip"android:text="@string/dialog" /><Button android:id= "@+id/pu_btn"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginRight="3dip"android:text="@string/pickup" /><Button android:id= "@+id/exit_btn"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginRight="3dip"android:text="@string/exit" /></LinearLayout>step4。编写pickup.xml(点击select按钮后显示的布局，是一个listview。）<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"><TextViewandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:text="Hello World, aas2l" /><ListView android:id="@+id/list"android:layout_width="wrap_content"android:layout_height="wrap_content" /></LinearLayout>step5。修改strings.xml<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">Hello World, aas2l!</string>    <string name="app_name">adroid activity surport 2 layouts</string>    <string name="pickup">select please</string>    <string name="exit">Exit</string>    <string name="dialog">dialog</string></resources>step6。运行。如图：初始界面点击select后选择后end 。。。。

step3。编写ass2l.xml (当然也可以在main.xml中写，这次我新建一个。）<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="wrap_content"><TextView android:id= "@+id/tv"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginRight="3dip"android:text="@string/dialog" /><Button android:id= "@+id/pu_btn"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginRight="3dip"android:text="@string/pickup" /><Button android:id= "@+id/exit_btn"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginRight="3dip"android:text="@string/exit" /></LinearLayout>step4。编写pickup.xml(点击select按钮后显示的布局，是一个listview。）<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"><TextViewandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:text="Hello World, aas2l" /><ListView android:id="@+id/list"android:layout_width="wrap_content"android:layout_height="wrap_content" /></LinearLayout>step5。修改strings.xml<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">Hello World, aas2l!</string>    <string name="app_name">adroid activity surport 2 layouts</string>    <string name="pickup">select please</string>    <string name="exit">Exit</string>    <string name="dialog">dialog</string></resources>step6。运行。如图：初始界面点击select后选择后end 。。。。