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Fragment-hide and show

2022-08-10 13:21:00 【Sharp Pai】

In order to save resources, many apps now use the replace() method to switch fragments, but in this case, if you don't talk about the previous fragments in the Yaru stack, you can't avoid the previous fragments being destroyed., so we use hide() and show() methods to switch fragments.

Achieving the effect

Rendering project address--GitHub - hornhuang/android-SignInSystem: ️ Committed to creating an ultimate sign-in system, technology and beauty can coexist!Also looking forward to your star 🥳～

Here is the best solution without talking nonsense

First, define four members

private Fragment mContent = new Fragment();// Record the current fragment due to replacementprivate Fragment mPerson;private Fragment mRanking;private Fragment mSummary;private FragmentTransaction transaction;

Secondly, in the OnCreate() method, initialize them

mPerson = new Personal();mRanking = new Ranking();mSummary = new Summary();fragmentManager = getSupportFragmentManager();mContent = mRanking;FragmentTransaction transaction = fragmentManager.beginTransaction();transaction.add(R.id.fragment, mContent).commit();navigation.setSelectedItemId(R.id.navigation_home);

Finally, called when the button is clicked

private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener= new BottomNavigationView.OnNavigationItemSelectedListener() {@Overridepublic boolean onNavigationItemSelected(@NonNull MenuItem item) {switch (item.getItemId()) {case R.id.navigation_home:switchContent(mPerson);return true;case R.id.navigation_dashboard:switchContent(mRanking);return true;case R.id.navigation_ranking:switchContent(mSummary);return true;}return false;}};
 private void switchContent(Fragment to) {if (mContent != to) {FragmentTransaction transaction = fragmentManager.beginTransaction();if (!to.isAdded()) { // Determine if it has been added// Hide the current fragment and add the next fragment to ittransaction.hide(mContent).add(R.id.fragment, to).commit();} else {// Hide the current fragment and show the next fragmenttransaction.hide(mContent).show(to).commit();}mContent = to;}}

Complete code address -->
Click to jump -- https://github.com/FishInWater-1999/android-SignInSystem/blob/master/app/src/main/java/com/example/joker/signinsystem/activities/MainActivity.java


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Copyright statement: This article is an original article by CSDN blogger "Yuanhao Benhao", following the CC 4.0 BY-SA copyright agreement, please attach a link to the original source and this statement for reprinting.
Original link: https://blog.csdn.net/qq_43377749/article/details/89854480

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https://yzsam.com/2022/222/202208101237546034.html

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