How to save variables when replacing the fragment?

Question

In my first fragment I have an EditText with a value. The problem is when I go to FragmentTwo and go back to FragmentOne the EditText (in FragmentOne) loses the text I previous inserted. I tried to save it in the onSaveInstanceState() and retrieve in the onViewStateRestored() but it seems that he does not store the information because the onSaveInstanceState() is never called and the savedInstanceState is always null.

This is my fragment replacing method

fragmentManager
                ?.beginTransaction()
                ?.setCustomAnimations(R.anim.slide_in_left, R.anim.slide_out_left, R.anim.slide_out_right, R.anim.slide_in_right)
                ?.replace(frame, MyFragment.newInstance(), tag)
                ?.addToBackStack(tag)
                ?.commit()

This is my onSaveInstanceState() in FragmentOne:

 override fun onSaveInstanceState(outState: Bundle) {
        outState.putDouble(Constants.currentAmount, currentAmount)
        super.onSaveInstanceState(outState)
    }

This is my onViewRestored in FragmentOne:

override fun onViewStateRestored(savedInstanceState: Bundle?) {
        super.onViewStateRestored(savedInstanceState)
        if(savedInstanceState!= null) {
            currentAmountSaved = savedInstanceState.getDouble(Constants.currentAmount)
        }
    }

This is my back press in FragmentTwo:

 fragmentManager?.popBackStack()

So my goal is to save the EditText, pass to FragmentTwo, and when I go back to FragmentOne the same EditText is with the value I put when I change Fragments.

This is my xml file from the FragmentOne(The fragment I want to restore)

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/contentView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:clickable="true"
    android:focusableInTouchMode="true"
    android:orientation="vertical">


    <View
        android:id="@+id/fManageFundsHeaderLayout"
        android:layout_width="match_parent"
        android:layout_height="250dp"
        android:background="@color/colorBackgroundToolbar"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent" />

    <include
        android:id="@+id/addFundsComponent"
        layout="@layout/component_manage_funds"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/fManageFundsHeaderLayout" />


</androidx.constraintlayout.widget.ConstraintLayout>

Hello please check https://github.com/Zhuinden/guide-to-kotlin/wiki/6.)-Anti-Patterns#unnecessary-chaining-of-safe-call-operator — EpicPandaForce, Jan 14 '19 at 22:07

Tomlezen · Answer 1 · 2019-01-16T02:47:36.520

0

You can do this:

private var contentView: View? = null

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    if (contentView == null) {
        contentView = inflater.inflate(xxxxx)
    }
    (contentView?.parent as? ViewGroup)?.removeView(contentView)
    return contentView
}

edited Jan 16 '19 at 02:47

answered Jan 15 '19 at 05:53

Tomlezen

1
1

Does not solve my problem when I do an onBackPressed() – José Nobre Jan 15 '19 at 11:07

score -1 · Answer 2 · answered Jan 14 '19 at 21:47

-1

I think that u r using wrong restore state callback. Try to explore Bundle object from onCreate/onCreateView methods of fragment

answered Jan 14 '19 at 21:47

Vladyslav Verbytskyy

149
1
6

1

This is not a complete answer, please edit or post as a comment. If you do not have enough reputation to add comments then try answering questions that you can provide complete solutions for. – Mark Jan 14 '19 at 21:51
@MarkKeen can you take a look and give your input at the problem. – José Nobre Jan 14 '19 at 21:55

How to save variables when replacing the fragment?

2 Answers2