android activity statck

android 开发过程中，有很多人都使用 activity statck， 来帮助自己 模拟 android 底层不可见的 那个 activity stack。

优缺点 不多说了。。

下面是个 实现。

	private static Stack<Activity> s_activitiesStack = new Stack<Activity>();

	public final static void pushActivity(Activity activity) {
		if (IConfig.MANAGE_ACTIVITYSTACK_MANUALLY) {
			if (IConfig.DEBUG_ON)
				Log.v(TAG, "Push activity:" + activity.getClass().getName());
			s_activitiesStack.push(activity);
		}
	}

	public final static void popActivity() {
		if (IConfig.MANAGE_ACTIVITYSTACK_MANUALLY) {
			if (!s_activitiesStack.isEmpty()) {
				s_activitiesStack.pop();
			}
		}
	}

	public final static Activity getTopActivity() {
		if (IConfig.MANAGE_ACTIVITYSTACK_MANUALLY) {
			if (!s_activitiesStack.isEmpty()) {
				return s_activitiesStack.peek();
			}
		}
		return null;
	}

	public final static void backToActivity(Class activity) {
		if (IConfig.MANAGE_ACTIVITYSTACK_MANUALLY) {
			while (!s_activitiesStack.isEmpty()) {
				Activity a = s_activitiesStack.peek();
				if (a.getClass().equals(activity)
						|| a.getClass().equals(HomeActivity.class)) {
					break;
				}
				if (IConfig.DEBUG_ON)
					Debug.u(TAG, "a.getClass():" + a.getClass().toString());
				if(a instanceof HotelDetailsActivity){
					((HotelDetailsActivity)a).back();
				}else{
					a.finish();
					Utils.popActivity();
				}
				
			}
		}
	}

	public final static void exit(Context context, Class luanchActivity) {

		Intent intent = new Intent();
		intent.setClass(context, luanchActivity);
		intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
		intent.putExtra(AppConstants.BUNDLEKEY_EXIT, true);
		context.startActivity(intent);
	}