android activity statck

android 開發過程中，有很多人都使用 activity statck， 來協助自己 類比 android 底層不可見的 那個 activity stack。

優缺點 不多說了。。

下面是個 實現。

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);}