Fragment保持状态替换，以防止重复加载

来源：互联网发布：sql语句里日期取变量编辑：程序博客网时间：2024/05/22 00:36

啊哈哈哈没验证好像没错吧

提供一个int INDEX和一个 String key的搜寻方法。

FragmentManager manager;Fragment fragmentA, fragmentB;public void show(int showIndex, int fragmentId) {if (manager == null) {manager = getSupportFragmentManager();}FragmentTransaction transaction = manager.beginTransaction();hide(showIndex, transaction);if (showIndex == 0) {if (fragmentA == null) {fragmentA = new Fragment();transaction.add(fragmentId, fragmentA);}} else {if (fragmentB == null) {fragmentB = new Fragment();transaction.add(fragmentId, fragmentB);}}transaction.show(fragmentA).commit();}/** *  * @param showIndex *            0,1 */public void hide(int showIndex, FragmentTransaction transaction) {if (showIndex == 0) {if (fragmentA != null) {transaction.hide(fragmentA);}} else {if (fragmentB != null) {transaction.hide(fragmentB);}}}/** *  * @param key * @param fragmentId */public void showB(String key, int fragmentId) {if (manager == null) {manager = getSupportFragmentManager();}FragmentTransaction transaction = manager.beginTransaction();hideB(key, transaction);Fragment f = manager.findFragmentByTag(key);if (f == null) {if (key.equals("A")) {fragmentA = new Fragment();transaction.add(fragmentId, fragmentA, key);f = fragmentA;}if (key.equals("B")) {fragmentB = new Fragment();transaction.add(fragmentId, fragmentB, key);f = fragmentB;}}transaction.show(f).commit();}/** * 显示的KEY，其他的需要隐藏 *  * @param showKey * @param transaction */public void hideB(String showKey, FragmentTransaction transaction) {if (showKey.equals("B")) {if (fragmentA != null) {transaction.hide(fragmentA);}} else {if (fragmentB != null) {transaction.hide(fragmentB);}}}

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