android中对于activity管理添加，关闭制定的activity工具类

public class AppManager {

private static Stack<Activity> activityStack;
private static AppManager instance;

private AppManager(){}
/**
 * 单一实例
 */
public static AppManager getAppManager(){
    if(instance==null){
        instance=new AppManager();
    }
    return instance;
}
/**
 * 添加Activity到堆栈
 */
public void addActivity(Activity activity){
    if(activityStack==null){
        activityStack=new Stack<Activity>();
    }
    if(!activityStack.contains(activity)){
    activityStack.add(activity);
    }
}
/**
 * 获取当前Activity（堆栈中最后一个压入的）
 */
public Activity currentActivity(){
    Activity activity=activityStack.lastElement();
    return activity;
}
/**
 * 结束当前Activity（堆栈中最后一个压入的）
 */
public void finishActivity(){
    Activity activity=activityStack.lastElement();
    finishActivity(activity);
}
/**
 * 结束指定的Activity
 */
public void finishActivity(Activity activity){
    if(activity!=null){
        activityStack.remove(activity);
        activity.finish();
        activity=null;
    }
}
/**
 * 结束指定类名的Activity
 */
public void finishActivity(Class<?> cls){
    Activity act=null;
    if (activityStack!=null){
        for (Activity activity : activityStack) {
            if(activity.getClass().equals(cls) ){
                act=activity;
            }
        }
    }
    if(act!=null){
    finishActivity(act);
    }
}
/**
 * 结束所有Activity
 */
public void finishAllActivity(){
    for (int i = 0, size = activityStack.size(); i < size; i++){
        if (null != activityStack.get(i)){
            activityStack.get(i).finish();
        }
    }
    activityStack.clear();
}
/**
 * 退出应用程序
 */
public void AppExit(Context context) {
    try {
        finishAllActivity();
        android.os.Process.killProcess(android.os.Process.myPid());

// ActivityManager activityMgr= (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
// activityMgr.restartPackage(context.getPackageName());
// System.exit(0);
} catch (Exception e) {

    }
}

}