static long lastClickTime = 0;
public static Fragment switchPagesByHide(Map>> map, FragmentManager fragmentManager, int fragment_container_id, int key) {
Fragment fragment;
ArrayList needHideFragments = new ArrayList<>();
for (Integer currentKey : map.keySet()) {
if (currentKey == key) {
continue;
}
PairX> pair = map.get(currentKey);
fragment = pair.second.get();
if (fragment == null) {
fragment = fragmentManager.findFragmentByTag(getFragmentTagName(pair.first));
if (fragment != null && fragment.isAdded()) {
needHideFragments.add(fragment);
if (BuildConfig.DEBUG && AppContext.DEBUG_) {
Log.w(TAG, "from tag fragment :" + fragment.getClass().getSimpleName());
}
}
continue;
} else if (fragment.isAdded()) {
needHideFragments.add(fragment);
} else {
fragment = fragmentManager.findFragmentByTag(getFragmentTagName(fragment.getClass()));
if (fragment != null && fragment.isAdded()) {
needHideFragments.add(fragment);
if (BuildConfig.DEBUG && AppContext.DEBUG_) {
Log.w(TAG, " and instance not add,from tag fragment :" + fragment.getClass().getSimpleName());
}
}
}
}
PairX> pair = map.get(key);
Fragment currentFragment = pair.second.get();
Fragment tagCurrentFragment = fragmentManager.findFragmentByTag(getFragmentTagName(currentFragment.getClass().getName()));
if (currentFragment == null) {
if (tagCurrentFragment != null) {
currentFragment = tagCurrentFragment;
} else {
try {
currentFragment = (Fragment) Class.forName(pair.first).newInstance();
pair.second = new SoftReference<>(currentFragment);
} catch (Throwable e) {
e.printStackTrace();
}
}
} else if (tagCurrentFragment != null && tagCurrentFragment.isAdded()) {//当前如果tag里面有还是需要隐藏它.
needHideFragments.add(tagCurrentFragment);
}
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
for (Fragment fragment_ : needHideFragments) {
//if (!fragment_.isHidden()) {
if (BuildConfig.DEBUG && AppContext.DEBUG_) {
if (fragment_.isHidden()) {
Log.w(TAG, "REPEAT_HIDE_" + fragment_.getClass().getSimpleName());
} else {
Log.w(TAG, "HIDE_" + fragment_.getClass().getSimpleName());
}
}
fragmentTransaction.hide(fragment_);
// popBackStackImmediate
//}
}
if (!(currentFragment instanceof MyFragment) && !AppUtils.isPadBySizeLarge(AppContext.getInstance())) {//因为隐藏了actionbar，所以会出现白屏，不能动画
long currentMs = System.currentTimeMillis();
if (lastClickTime == 0 || currentMs - lastClickTime > 5500) {
currentFragment.setEnterTransition(createTransition());
currentFragment.setReenterTransition(createTransition());
lastClickTime = currentMs;
if(BuildConfig.DEBUG){
Log.w(TAG,"_fragment anim:"+currentFragment.getClass().getSimpleName());
}
}else{//必须设置，否则依然会因为切换过快导致重复.
currentFragment.setEnterTransition(null);
currentFragment.setReenterTransition(null);
}
}
if (currentFragment.isAdded()) {
if (BuildConfig.DEBUG) {
Log.w(TAG, "FRAGMENT_SHOW:"+currentFragment.getClass().getSimpleName()+",before_hidden:" + currentFragment.isHidden() + ",save:" + currentFragment.isStateSaved() + ",detach:" + currentFragment.isDetached() + ",add:" + currentFragment.isAdded());
}
fragmentTransaction.show(currentFragment);
} else {
if (BuildConfig.DEBUG) {
Log.w(TAG, "FRAGMENT_ADD:" + currentFragment.isHidden() + ",save:" + currentFragment.isStateSaved() + ",detach:" + currentFragment.isDetached() + ",add:" + currentFragment.isAdded() + "," + currentFragment);
}
fragmentTransaction.add(fragment_container_id == 0 ? R.id.fragment_space : fragment_container_id, currentFragment, getFragmentTagName(currentFragment.getClass()));
}
fragmentTransaction.commitAllowingStateLoss();
return currentFragment;
}
解决办法，频繁点击就直接清除动画，不使用动画
如果还是有重叠，最后经过修改的版本是这样的
public static Fragment switchPagesByHide(Map>> map, FragmentManager fragmentManager, int fragment_container_id, int key, DialogUtils.INotify onHiddenNotify, DialogUtils.INotify onShowNotify) {
Fragment fragment;
ArrayList needHideFragments = new ArrayList<>();
for (Integer loopKey : map.keySet()) {
if (loopKey == key) {
continue;
}
PairX> pair = map.get(loopKey);
fragment = pair.second.get();
if (fragment == null) {
fragment = fragmentManager.findFragmentByTag(getFragmentTagName(pair.first));
if (fragment != null) {
// if (fragment != null && fragment.isAdded()) {
needHideFragments.add(fragment);
if (BuildConfig.DEBUG && AppContext.DEBUG_) {
Log.w(TAG, "from tag fragment :" + fragment.getClass().getSimpleName());
}
}
continue;
/* } else if (!fragment.isHidden()) {
needHideFragments.add(fragment);*/
} else {
// fragment = fragmentManager.findFragmentByTag(getFragmentTagName(fragment.getClass()));
// if (fragment != null && !fragment.isHidden()) {
needHideFragments.add(fragment);
if (BuildConfig.DEBUG && AppContext.DEBUG_) {
Log.w(TAG, " and instance not add,from tag fragment :" + fragment.getClass().getSimpleName());
}
// }
}
}
PairX> pair = map.get(key);
Fragment currentFragment = pair.second.get();
Fragment tagCurrentFragment = currentFragment == null ? null : fragmentManager.findFragmentByTag(getFragmentTagName(currentFragment.getClass().getName()));
if (currentFragment == null) {
if (tagCurrentFragment != null) {
currentFragment = tagCurrentFragment;
} else {
try {
currentFragment = (Fragment) Class.forName(pair.first).newInstance();
pair.second = new SoftReference<>(currentFragment);
} catch (Throwable e) {
e.printStackTrace();
}
}
} else if (tagCurrentFragment != null && tagCurrentFragment.isAdded()) {//当前如果tag里面有还是需要隐藏它.
if (BuildConfig.DEBUG) {
Log.w(TAG, "FIND REPEAT FROM TAG");
}
}
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
for (Fragment fragment_ : needHideFragments) {
//if (!fragment_.isHidden()) {
if (BuildConfig.DEBUG && AppContext.DEBUG_) {
if (fragment_.isHidden()) {
Log.w(TAG, "REPEAT_HIDE_" + fragment_.getClass().getSimpleName());
} else {
Log.w(TAG, "HIDE_" + fragment_.getClass().getSimpleName());
}
}
fragmentTransaction.hide(fragment_);
if (fragment_.isResumed()) {
onHiddenNotify.onNotify(fragment_);
}
// popBackStackImmediate
//}
}
if (!(currentFragment instanceof MyFragment) && !AppUtils.isPadBySizeLarge(AppContext.getInstance())) {//因为隐藏了actionbar，所以会出现白屏，不能动画
long currentMs = System.currentTimeMillis();
/* if (lastClickTime == 0 || currentMs - lastClickTime > 3000) {
currentFragment.setEnterTransition(createTransition());
currentFragment.setReenterTransition(createTransition());
lastClickTime = currentMs;
if (BuildConfig.DEBUG) {
Log.w(TAG, "_fragment anim:" + currentFragment.getClass().getSimpleName());
}
} else {//必须设置，否则依然会因为切换过快导致重复.
currentFragment.setEnterTransition(null);
currentFragment.setReenterTransition(null);
}*/
}
if (currentFragment.isAdded()) {
if (BuildConfig.DEBUG) {
Log.w(TAG, "FRAGMENT_SHOW:" + currentFragment.getClass().getSimpleName() + ",before_hidden:" + currentFragment.isHidden() + ",save:" + currentFragment.isStateSaved() + ",detach:" + currentFragment.isDetached() + ",add:" + currentFragment.isAdded());
}
// fragmentTransaction.remove(currentFragment).commitNowAllowingStateLoss();// Fragment no longer exists for key f#0: unique id 5893b1ef-2180-4110-ac1a-36ffc36df0b1 viewPager2.setSaveEnabled(false);
fragmentTransaction.show(currentFragment);
if (onShowNotify != null && currentFragment.isResumed()) {
onShowNotify.onNotify(currentFragment);
}
} else {
if (BuildConfig.DEBUG) {
Log.w(TAG, "FRAGMENT_ADD_NEW :currentStatus:is hidden:" + currentFragment.isHidden() + ",save:" + currentFragment.isStateSaved() + ",detach:" + currentFragment.isDetached() + ",add:" + currentFragment.isAdded() + "," + currentFragment);
}
fragmentTransaction.add(fragment_container_id == 0 ? R.id.fragment_space : fragment_container_id, currentFragment, getFragmentTagName(currentFragment.getClass()));
if (currentFragment.isHidden()) {
fragmentTransaction.show(currentFragment);
}
if (onShowNotify != null && !currentFragment.isResumed()) {
onShowNotify.onNotify(currentFragment);
}
}
fragmentTransaction.commitAllowingStateLoss();
return currentFragment;
}
其实分别屏蔽了2个分支的逻辑，因为同时返回有重叠，但是概率非常低，横竖屏方式无法测试出来，快速点击还是有概率出现 ，所以改成了最终的代码
测试回收的方法非常简单，就是不固定横屏或者竖屏旋转屏幕就可以让activity重建，
在onCreate中 是先添加进去，然后从savedInstanceState中重新找出来，找到的进行替换。这样保证了顺序问题，
ArrayMap>> fragments = new ArrayMap<>();
fragments.put(R.id.navigation_home, pairHome);
fragments.put(R.id.navigation_app, new FragmentUtil.PairX>(AppModuleNewStyleFragment.class.getName(), new SoftReference<>(new AppModuleNewStyleFragment())));
fragments.put(R.id.navigation_reportform, new FragmentUtil.PairX>(ReportFormsFragment.class.getName(), new SoftReference<>(new ReportFormsFragment())));
fragments.put(R.id.navigation_notifications, new FragmentUtil.PairX>(NotificationsFragment.class.getName(), new SoftReference<>(new NotificationsFragment())));
fragments.put(R.id.navigation_my, new FragmentUtil.PairX>(MyFragment.class.getName(), new SoftReference<>(new MyFragment())));
if (savedInstanceState != null) {
int tab_id = savedInstanceState.getInt("tab_id");
for (Integer key : fragments.keySet()) {
Fragment fragment = getSupportFragmentManager().getFragment(savedInstanceState, key + "");
if (fragment != null) {
fragments.put(key, new FragmentUtil.PairX>(fragment.getClass().getName(), new SoftReference<>(fragment)));
if (BuildConfig.DEBUG) {
Log.w(TAG, "" + fragment.getClass().getName() + "从存储中恢复了");
}
}
}
binding.navView.setSelectedItemId(tab_id);
}
在保存状态方法中
@Override
protected void onSaveInstanceState(@NonNull Bundle outState) {
super.onSaveInstanceState(outState);
Log.w(TAG, "onSaveInstanceState");
for (Map.Entry>> entry : fragments.entrySet()) {
FragmentUtil.PairX> pair = entry.getValue();
if (pair.second.get() != null) {
Fragment fragment = pair.second.get();
if (fragment != null && fragment.isAdded()) {
getSupportFragmentManager().putFragment(outState, entry.getKey() + "", fragment);
}
} else {
}
}
outState.putInt("tab_id", getBinding().navView.getSelectedItemId());
}
PairX类
public static class PairX {
public First first;
public Second second;
public PairX(First first, Second second) {
this.first = first;
this.second = second;
}
}
我这里用弱引用是为了解决被回收了，但是依然被activity持有的问题，不然我为什么不直接用replace方法呢，replace是我以前常用的方法，然后使用强引用，但是这样不会自动回收replace之前的fragment吧。
重叠的坑很多，我顺便给几个参考链接
各种坑的解决
https://blog.51cto.com/u_15303287/3089390
fragment自身法隐藏解决重叠
https://blog.csdn.net/weixin_33805557/article/details/92344513
https://www.jianshu.com/p/d9143a92ad94