一、启动页面 AppStart

/**
* 应用程序启动类：显示欢迎界面并跳转到主界面
* @author liux (http://my.oschina.net/liux)
* @version 1.0
* @created 2012-3-21
*/
public class AppStart extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final View view = View.inflate(this, R.layout.start, null);
setContentView(view);

//渐变展示启动屏     -------------------------------------------------------  分析 1
AlphaAnimation aa = new AlphaAnimation(0.3f,1.0f);
aa.setDuration(2000);
view.startAnimation(aa);
aa.setAnimationListener(new AnimationListener()
{
@Override
public void onAnimationEnd(Animation arg0) {
redirectTo();
}
@Override
public void onAnimationRepeat(Animation animation) {}
@Override
public void onAnimationStart(Animation animation) {}

});

//兼容低版本cookie（1.5版本以下，包括1.5.0,1.5.1）
AppContext appContext = (AppContext)getApplication();
String cookie = appContext.getProperty("cookie");     //-----------------------------------------------分析 2
if(StringUtils.isEmpty(cookie)) {
String cookie_name = appContext.getProperty("cookie_name");
String cookie_value = appContext.getProperty("cookie_value");
if(!StringUtils.isEmpty(cookie_name) && !StringUtils.isEmpty(cookie_value)) {
cookie = cookie_name + "=" + cookie_value;
appContext.setProperty("cookie", cookie);
appContext.removeProperty("cookie_domain","cookie_name","cookie_value","cookie_version","cookie_path");
}
}
}

/**
* 跳转到...
*/
private void redirectTo(){
Intent intent = new Intent(this, Main.class);
startActivity(intent);
finish();
}
}

appContext.getProperty("cookie")  调用流程：