为了安全退出多个已创建的activity?

可以自定义application：myapplication.

增加一个list成员保存，一些关键的已创建的activity实例：

1 private List
     
       activityList = new LinkedList
      
       (); 2  3 // 保存 所有activity的this 4     public void addActivity(Activity activity) { 5         activityList.add(activity); 6     } 7  8 public void exit() { 9         // save cache data to db10         CacheManager cacheManager = CacheManager.getInstance(this);11         cacheManager.saveNewCache1ToDB();12         this.msgNewListMap.clear();13         for (Activity activity : activityList) {14             activity.finish();15         }16     }
      
     

然后在activit创建的时候，oncreate中添加该activity到list中

1 MyApplication.getInstance().addActivity(ChatListActivity.this);

在程序退出时，例如双击返回键退出程序，调用application的exit方法：

1 // 退出 2     @Override 3     public boolean onKeyDown(int keyCode, KeyEvent event) { 4         // TODO Auto-generated method stub 5         if (keyCode == KeyEvent.KEYCODE_BACK) { 6             long currentTime = System.currentTimeMillis(); 7             if ((currentTime - touchTime) >= waitTime) { 8                 showCustomToast(R.string.main_exit); 9                 touchTime = currentTime;10             } else {11                 // android.os.Process.killProcess(android.os.Process.myPid());12                 MyApplication.getInstance().exit();13             }14             return true;15 16         }17         return super.onKeyDown(keyCode, event);18     }

代码完整路径：http://git.oschina.net/zj2012zy/Android-Demo/tree/master/CustomApplication