Activity管理

/** * 管理所有Activity 当启动一个Activity时，就将其保存到Stack中， 退出时，从Stack中删除 *  * @version v1.0 * @date 2013-7-30 */public class ActivityManager{    /**     * 保存所有Activity     */    private volatile Stack<Activity> activityStack = new Stack<Activity>();        private static volatile ActivityManager instance;        private ActivityManager()    {    }        /**     * 创建单例类，提供静态方法调用     *      * @return ActivityManager     */    public static ActivityManager getInstance()    {        if (instance == null)        {            instance = new ActivityManager();        }        return instance;    }        /**     * 退出Activity     *      * @param activity Activity     */    public void popActivity(Activity activity)    {        if (activity != null)        {            LogN.d(this, "popActivity: " + activity.getLocalClassName());            activityStack.remove(activity);        }    }        /**     * 获得当前栈顶的Activity     *      * @return Activity Activity     */    public Activity currentActivity()    {        Activity activity = null;        if (!activityStack.empty())        {            activity = activityStack.lastElement();        }        return activity;    }        /**     * 将当前Activity推入栈中     *      * @param activity Activity     */    public void pushActivity(Activity activity)    {        LogN.d(this, "pushActivity: " + activity.getLocalClassName());        activityStack.add(activity);    }        /**     * 退出栈中其他所有Activity     *      * @param cls Class 类名     */    @SuppressWarnings("rawtypes")    public void popOtherActivity(Class cls)    {        if(null == cls)        {            LogN.e(this, "cls is null");            return;        }                for(Activity activity : activityStack)        {            if (null == activity || activity.getClass().equals(cls))            {                continue;            }                        activity.finish();        }        LogN.d(this, "activity num is : " + activityStack.size());    }        /**     * 退出栈中所有Activity     *      */    public void popAllActivity()    {        while (true)        {            Activity activity = currentActivity();            if (activity == null)            {                break;            }            activity.finish();            popActivity(activity);        }        LogN.d(this, "activity num is : " + activityStack.size());    }        public void startNextActivity(Class<?> activity)    {        Activity curActivity = currentActivity();        Intent intent = new Intent(curActivity, activity);        curActivity.startActivity(intent);        curActivity.overridePendingTransition(R.anim.push_right_in, R.anim.push_left_out);    }}