Activity优化几个结束的方法

 package com.itau.jingdong;

 import java.util.Stack;
 import android.app.Activity;
 import android.app.ActivityManager;
 import android.content.Context;

 /**
  * @author Tau.Chen 陈涛
  *
  * @email tauchen1990@gmail.com,1076559197@qq.com
  *
  * @date 2013年9月12日
  *
  * @version V_1.0.0
  *
  * @description 应用程序Activity的管理类
  *
  */
 public class AppManager {
     private static Stack<Activity> mActivityStack;
     private static AppManager mAppManager;

     private AppManager() {
     }

     /**
      * 单一实例
      */
     public static AppManager getInstance() {
         if (mAppManager == null) {
             mAppManager = new AppManager();
         }
         return mAppManager;
     }

     /**
      * 添加Activity到堆栈
      */
     public void addActivity(Activity activity) {
         if (mActivityStack == null) {
             mActivityStack = new Stack<Activity>();
         }
         mActivityStack.add(activity);
     }

     /**
      * 获取栈顶Activity（堆栈中最后一个压入的）
      */
     public Activity getTopActivity() {
         Activity activity = mActivityStack.lastElement();
         return activity;
     }

     /**
      * 结束栈顶Activity（堆栈中最后一个压入的）
      */
     public void killTopActivity() {
         Activity activity = mActivityStack.lastElement();
         killActivity(activity);
     }

     /**
      * 结束指定的Activity
      */
     public void killActivity(Activity activity) {
         if (activity != null) {
             mActivityStack.remove(activity);
             activity.finish();
             activity = null;
         }
     }

     /**
      * 结束指定类名的Activity
      */
     public void killActivity(Class<?> cls) {
         for (Activity activity : mActivityStack) {
             if (activity.getClass().equals(cls)) {
                 killActivity(activity);
             }
         }
     }

     /**
      * 结束所有Activity
      */
     public void killAllActivity() {
         for (int i = 0, size = mActivityStack.size(); i < size; i++) {
             if (null != mActivityStack.get(i)) {
                 mActivityStack.get(i).finish();
             }
         }
         mActivityStack.clear();
     }

     /**
      * 退出应用程序
      */
     public void AppExit(Context context) {
         try {
             killAllActivity();
             ActivityManager activityMgr = (ActivityManager) context
                     .getSystemService(Context.ACTIVITY_SERVICE);
             activityMgr.restartPackage(context.getPackageName());
             System.exit(0);
         } catch (Exception e) {
         }
     }
 }