??在Activity之间数据传递中还有一种比较实用的方式，就是全局对象，实用J2EE的读者来说都知道Java Web的四个作用域，
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这四个作用域从小到大分别是Page、Request、Session和Application，其中Application域在应用程序的任何地方都可以使用
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和访问，除非是Web服务器停止，Android中的全局对象非常类似于Java Web中的Application域，除非是Android应用程序清
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除内存，否则全局对象将一直可以访问。
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?案例一
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package com.android.myapp;import android.R.integer;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;public class Main extends Activity { /** Called when the activity is first created. */ private Button button; private MyApp myApp; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); button = (Button)this.findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub myApp = (MyApp)getApplication(); myApp.setName("jack");//修改之后的名称 Intent intent = new Intent(Main.this,OtherActivity.class); startActivity(intent); } }); }}?
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package com.android.myapp;import android.app.Activity;import android.os.Bundle;import android.widget.TextView;public class OtherActivity extends Activity { private MyApp myApp; private TextView textView; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.other); textView = (TextView)this.findViewById(R.id.msg); myApp = (MyApp)getApplication(); textView.setText("-appname-->>"+myApp.getName()); }}?
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package com.android.myapp;import android.app.Application;public class MyApp extends Application { public String name; public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public void onCreate() { // TODO Auto-generated method stub super.onCreate(); setName("张三"); }}?