8. 利用反射机制， ListArray，intent来实现多Activity的切换

package com.example.thenewboston;import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;public class Menu extends ListActivity{

//classes里面存放的都是其他Activity的name
private String classes[] = {"MainActivity", "Splash", "example2", "example3", "example4", "example5"}; @Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
//利用ListAdapter将classes与onListItemClick（）关联
setListAdapter(new ArrayAdapter<String>(Menu.this, android.R.layout.simple_list_item_1, classes)); }

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);

//每当click的时候可以得到所click的Activity name在Array中的position
String cheese = classes[position]; try {
//利用反射找到Class类
Class ourClass = Class.forName("com.example.thenewboston."+cheese);
//将这个class传递给Intent
Intent intent = new Intent(Menu.this, ourClass);
//start activity
startActivity(intent);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{ } }}