Vfrdtyky

When I start my activity by the first time everything is fine I can navigate normally but after rotating the screen the fragmentMananger appears to bug, and after every change of fragment it loads a blank fragment if I rotate the screen and the activity is recreated the correct fragment appears but the bug persists.

when I quit the app and back to use it the error persists and only disappears after clear the user data, I try to recreate the activity after every fragment change but it only turn things worst.

the one thing solve the problem is to clear user data after every app finalization but it erases important data managed by the app at runtime that need persist via file for the next execution.

I use a companion object for manage fragment names:

companion object {

    val TAG = this::class.java.canonicalName!!

    const val MAIN_FRAGMENT = "MainFragment"

    const val SECOND_FRAGMENT = "SecondFragment"

    const val THIRD_FRAGMENT = "ThirdFragment"

    const val FOURTH_FRAGMENT = "FourthFragment"

    const val FIFTH_FRAGMENT = "FifthFragment"

}

functions for manage fragments:

fun callFragment(s: String? = null) {

    validateFrag(s ?: MAIN_FRAGMENT, ::setFragment)

}



fun updateFragment() {

    Control.logData("updating fragment $fragment_state")

    validateFrag(fragment_state, ::setFragment)

}



private fun validateFrag(s: String, f: (String) -> Unit) {

    when (s) {

        SECOND_FRAGMENT -> f(s)

        THIRD_FRAGMENT -> f(s)

        FOURTH_FRAGMENT -> f(s)

        FIFTH_FRAGMENT -> f(s)

        else -> f(MAIN_FRAGMENT)

    }

}



private fun createFrag(id: String): Fragment = when (id) {

    SECOND_FRAGMENT -> SecondFragment.newInstance()

    THIRD_FRAGMENT -> ThirdFragment.newInstance()

    FOURTH_FRAGMENT -> FourthFragment.newInstance()

    FIFTH_FRAGMENT -> FifthFragment.newInstance(this)

    else -> MainFragment.newInstance()

}



private fun setFragment(id: String) {

    val userAuth = userAuth

    userAuth ?: return

    Control.logData("loading fragment $id")

    val frame = R.id.app_frame

    val fragment = (fragmentManager.findFragmentByTag(id) ?: createFrag(id))

    currentFragment = fragment as MyAppFragment

    fragment_state = id



    when{

        fragmentManager.fragments.size == 0 -> {

            fragmentManager.beginTransaction()

                    .add(frame, createFrag(MAIN_FRAGMENT), MAIN_FRAGMENT)

                    .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)

                    .commitNowAllowingStateLoss()

        }

        !fragmentManager.fragments.contains(fragment as Fragment) -> {

            fragmentManager.beginTransaction()

                    .add(frame, fragment, id)

                    .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)

                    .commitNowAllowingStateLoss()

        }

        else ->{

            with(fragmentManager.beginTransaction()) {

                replace(frame, fragment, id)

                setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)

                commitNowAllowingStateLoss()

            }

        }

    }

}

for the commits I try Commit(), CommitNow() too

my fragment implementation:

package com.domain.app.fragments



import android.content.Context

import android.support.v4.app.Fragment

import android.os.Bundle

import android.support.v7.widget.LinearLayoutManager

import android.support.v7.widget.RecyclerView

import android.view.LayoutInflater

import android.view.View

import android.view.ViewGroup

import android.widget.ImageButton

import android.widget.ScrollView

import com.reactivex.disposables.Disposable

import com.domain.app.Control

import com.domain.app.R

import com.domain.app.AppApplicatcomn

import com.domain.app.activities.appActivity

import com.domain.app.dagger.services.IRXService

import com.domain.app.recycler.adapter.DataListAdapter

import kotlinx.android.synthetic.main.fragment_main.*

import javax.inject.Inject



class MainFragment : Fragment(), AppFragment {



// instanciate data



compancomn object {

    fun newInstance(): MainFragment{

        return MainFragment()

    }

}



override fun onAttach(context: Context?) {

    super.onAttach(context)

    activity?.let { act ->

        //subscribe RX

    }

}



override fun onDetach() {

    super.onDetach()

    //disposeRX

}



override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,

                          savedInstanceState: Bundle?): View? {

    return inflater.inflate(R.layout.fragment_main, container, false)

}



override fun onViewCreated(view: View, savedInstanceState: Bundle?) {

    super.onViewCreated(view, savedInstanceState)

    dockInit()

    recyclerInit()

    if(Control.index.isEmpty()){

        noDataScreen()

    }

    else{

        Control.putOnScreen()

    }

}



override fun noDataScreen() {

    activity?.runOnUiThread {

        main_noDataQrButton?.visibility = View.VISIBLE

        main_noDataText?.visibility = View.VISIBLE

        Control.loadingDataStream.onNext(false)

        isInit = false

    }

}



override fun notifyRecycler() {

    activity?.runOnUiThread{

        if(::list.isInitialized){

            mAdapter.update()

            list.adapter?.notifyDataSetChanged()

        }

    }

}



private fun recyclerInit(){

    mAdapter = DataListAdapter(activity as appActivity)

    mAdapter.setHasStableIds(true)

    list = view!!.findViewById<RecyclerView>(R.id.main_listDataListRecycler).apply {

        setHasFixedSize(true)

        setItemViewCacheSize(8)

        layoutManager = LinearLayoutManager(context)

        adapter = mAdapter

    }



}

}

my manifest:

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.domain.app">

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<uses-permission android:name="android.permission.INTERNET" />

<uses-permission android:name="android.permission.CAMERA" />

<uses-permission android:name="android.permission.VIBRATE" />



<application

    android:name=".AppApplication"

    android:allowBackup="true"

    android:icon="@drawable/app"

    android:label="@string/app_name"

    android:roundIcon="@drawable/app_round"

    android:supportsRtl="true"

    android:theme="@style/AppTheme.NoActionBar"

    android:allowClearUserData="true"

    android:fullBackupContent="@xml/backup_descriptor">



    <!-- android:theme="@style/AppTheme" -->



    <activity

        android:name=".activities.AppActivity"

        android:screenOrientation="portrait"

        android:label="@string/app_name"

        android:theme="@style/AppTheme.NoActionBar">

        <intent-filter>



            <!-- para ser aberto com action APP -->

            <action android:name="android.intent.action.APP" />

            <action android:name="android.intent.action.MAIN" />

            <action android:name="io.ubivis.digitalmobility.action.CONSUME_APP_NOTIFICATION" />



            <category android:name="android.intent.category.DEFAULT" />

        </intent-filter>

        <intent-filter>

            <action android:name="android.intent.action.VIEW" />



            <category android:name="android.intent.category.DEFAULT" />

            <category android:name="android.intent.category.BROWSABLE" />



            <data

                android:host="app.domain.io"

                android:scheme="https" />

        </intent-filter>

    </activity>



    <service android:name=".services.FirebaseMessageService">

        <intent-filter>

            <action android:name="com.google.firebase.MESSAGING_EVENT" />

        </intent-filter>

    </service>

    <service android:name=".services.FirebaseTokenService">

        <intent-filter>

            <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />

        </intent-filter>

    </service>



    <meta-data

        android:name="com.google.firebase.messaging.default_notification_icon"

        android:resource="@drawable/ic_logo_app_60dp" />

    <meta-data

        android:name="com.google.firebase.messaging.default_notification_color"

        android:resource="@color/colorPrimary" />



    <!-- Para Android 8 - Necessário um canal para notificações -->

    <!-- <meta-data -->

    <!-- android:name="com.google.firebase.messaging.default_notification_channel_id" -->

    <!-- android:value="@string/default_notification_channel_id"/> -->

</application>

my activity xml is:

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.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:layout_width="match_parent"

android:layout_height="match_parent">



<android.support.v7.widget.CardView

    android:id="@+id/app_connectionCard"

    android:layout_width="match_parent"

    android:layout_height="40dp"

    android:visibility="gone"

    app:cardBackgroundColor="@android:color/holo_red_dark"

    app:layout_constraintEnd_toEndOf="parent"

    app:layout_constraintStart_toStartOf="parent"

    app:layout_constraintTop_toBottomOf="@+id/app_toolbar">



    <android.support.constraint.ConstraintLayout

        android:layout_width="match_parent"

        android:layout_height="match_parent">



        <TextView

            android:id="@+id/textView2"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@string/connectionFail"

            android:textColor="@color/cardview_light_background"

            android:textSize="24sp"

            android:textStyle="bold"

            app:layout_constraintBottom_toBottomOf="parent"

            app:layout_constraintEnd_toEndOf="parent"

            app:layout_constraintStart_toStartOf="parent"

            app:layout_constraintTop_toTopOf="parent" />

    </android.support.constraint.ConstraintLayout>

</android.support.v7.widget.CardView>



<android.support.v7.widget.Toolbar

    android:id="@+id/app_toolbar"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:background="@color/ubivis_background_blue"

    android:theme="@style/ThemeOverlay.AppCompat.Dark"

    app:layout_constraintEnd_toEndOf="parent"

    app:layout_constraintStart_toStartOf="parent"

    app:layout_constraintTop_toTopOf="parent" />



<android.support.v4.widget.DrawerLayout

    android:id="@+id/app_drawer"

    android:layout_width="0dp"

    android:layout_height="0dp"

    app:layout_constraintBottom_toBottomOf="parent"

    app:layout_constraintEnd_toEndOf="parent"

    app:layout_constraintStart_toStartOf="parent"

    app:layout_constraintTop_toBottomOf="@+id/app_connectionCard"

    tools:openDrawer="start">



    <FrameLayout

        android:id="@+id/app_frame"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toTopOf="parent">

    </FrameLayout>



    <android.support.design.widget.NavigationView

        android:id="@+id/app_navigation"

        android:layout_width="wrap_content"

        android:layout_height="match_parent"

        android:layout_gravity="start"

        android:background="@color/colorPrimaryDark"

        android:fitsSystemWindows="true"

        android:theme="@style/UbivisDrawerTheme"

        app:headerLayout="@layout/nav_header_app"

        app:itemIconTint="@color/ubivis_orange"

        app:menu="@menu/activity_app_drawer" />



</android.support.v4.widget.DrawerLayout>

fragment xml:

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.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/root"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:background="@android:color/white"

android:theme="@style/AppTheme.NoActionBar"

tools:context=".fragments.MainFragment">



<ImageView

    android:id="@+id/imageView"

    android:layout_width="0dp"

    android:layout_height="0dp"

    android:adjustViewBounds="false"

    android:cropToPadding="false"

    android:scaleType="fitEnd"

    android:tint="@color/background"

    android:translationX="128dp"

    android:translationY="128dp"

    android:visibility="visible"

    app:layout_constraintBottom_toBottomOf="parent"

    app:layout_constraintEnd_toEndOf="parent"

    app:layout_constraintStart_toStartOf="parent"

    app:layout_constraintTop_toTopOf="parent"

    app:srcCompat="@drawable/logo_domain_vasado" />



<android.support.v7.widget.RecyclerView

    android:id="@+id/main_listDataListRecycler"

    android:layout_width="0dp"

    android:layout_height="0dp"

    app:layout_constraintBottom_toBottomOf="parent"

    app:layout_constraintEnd_toStartOf="@+id/main_dock"

    app:layout_constraintHorizontal_bias="0.0"

    app:layout_constraintStart_toStartOf="parent"

    app:layout_constraintTop_toTopOf="parent"

    app:layout_constraintVertical_bias="0.0">



</android.support.v7.widget.RecyclerView>



<TextView

    android:id="@+id/main_noDataText"

    android:layout_width="0dp"

    android:layout_height="wrap_content"

    android:layout_marginBottom="8dp"

    android:layout_marginEnd="8dp"

    android:layout_marginStart="8dp"

    android:text="@string/noDataMessage"

    android:textAlignment="center"

    android:textSize="30sp"

    android:textStyle="bold"

    android:visibility="visible"

    app:layout_constraintBottom_toTopOf="@+id/main_noDataQrButton"

    app:layout_constraintEnd_toStartOf="@+id/main_dock"

    app:layout_constraintStart_toStartOf="parent" />



<Button

    android:id="@+id/main_noDataQrButton"

    android:layout_width="220dp"

    android:layout_height="220dp"

    android:layout_marginBottom="5dp"

    android:layout_marginEnd="8dp"

    android:layout_marginStart="8dp"

    android:layout_marginTop="30dp"

    android:background="@drawable/shape_qr_code_frame"

    android:elevation="16dp"

    android:onClick="qrScan"

    android:theme="@style/AppTheme"

    android:visibility="visible"

    app:layout_constraintBottom_toBottomOf="parent"

    app:layout_constraintEnd_toStartOf="@+id/main_dock"

    app:layout_constraintStart_toStartOf="@+id/main_listDataListRecycler"

    app:layout_constraintTop_toTopOf="parent"

    tools:ignore="OnClick" />

for the activity lifecycle:

override fun onCreate(savedInstanceState: Bundle?) {

    super.onCreate(savedInstanceState)

    Control.logData("creating activity")



    setContentView(R.layout.activity_app)

    // keep screen alive

    window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)

    // set toolbar

    setSupportActionBar(findViewById(R.id.app_toolbar))

    supportActionBar?.title = getString(R.string.Datas)

    supportActionBar?.setDisplayHomeAsUpEnabled(true)

    supportActionBar?.setDisplayShowHomeEnabled(true)

    isWaitingResult = savedInstanceState?.getBoolean(isWaitingResultCode) ?: false

    savedInstanceState?.let{

        fragment_state =  savedInstanceState.getString(fragState) ?: fragment_state

        userAuth = savedInstanceState.getSerializable(userAuthCode) as? UserAuthentication?

    }

    val DataMenu = findViewById<NavigationView>(R.id.app_navigation)

            .menu.findItem(R.id.DataButton)

    DataMenu?.isChecked = true

    if (!Control.filters) filterMenu?.icon = drawable(R.drawable.filter_inactive)

    //injection

    if (!isInjected) {

        onInject()

    }

}



override fun onStop() {

    super.onStop()

    Control.logData("stopping activity")

    fragmentManager.executePendingTransactions()

    Control.mainRunning = false

    loop = false

    saveFav()

}



override fun onDestroy() {

    super.onDestroy()

    Control.logData("destroying activity")

    Control.rx.forEach { it.dismiss() }

    Control.rx.clear()

}

Control is a object with some function and data commonly used across the App