Saturday, 16 October 2021

How to open the last fragment opened after closed app and reopen it using Navigation drawer and Navigation Component

Update

I tried to use onSaveInstanceState for saving the value of current destination and onRestoreInstanceState to get the value, then use the navGraph to set start destination but there's problem, the value is not saved or restored, here's the updated MainActivity

@AndroidEntryPoint
public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";
    @SuppressWarnings("unused")
    private AppBarConfiguration mAppBarConfiguration;
    private NavHostFragment navHostFragment;
    private  NavController navController;
    NavGraph navGraph;


    @Override
    protected void onRestoreInstanceState(@NonNull Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);

        Toast.makeText(this,"savedInstanceState is not null",Toast.LENGTH_SHORT).show();
        Log.w(TAG, "CURRENT_DESTINATION: " + savedInstanceState.getInt("CURRENT_DESTINATION"));
        navGraph.setStartDestination(savedInstanceState.getInt("CURRENT_DESTINATION"));
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ActivityMainBinding binding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());


        setSupportActionBar(binding.appBarMain.toolbar);
        mAppBarConfiguration = new AppBarConfiguration.Builder(R.id.nav_home, R.id.nav_accessory,
                R.id.nav_arcade, R.id.nav_fashion,
                R.id.nav_food, R.id.nav_heath,
                R.id.nav_lifestyle, R.id.nav_sports, R.id.about)
                .setOpenableLayout(binding.drawerLayout)
                .build();


        navHostFragment = (NavHostFragment)
                getSupportFragmentManager().findFragmentById(R.id.nav_host_fragment);

        if(navHostFragment !=null) {
          navController = navHostFragment.getNavController();
        }

        NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
        NavigationUI.setupWithNavController(binding.navView, navController);

        navGraph = navController.getNavInflater().inflate(R.navigation.mobile_navigation);



    }

    @Override
    public void onSaveInstanceState(@NonNull @NotNull Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("CURRENT_DESTINATION",
                Objects.requireNonNull(navController.getCurrentDestination()).getId());

    }

    @Override
    public boolean onSupportNavigateUp() {
        return NavigationUI.navigateUp(navController, mAppBarConfiguration)
                || super.onSupportNavigateUp();
    }

}

Problem in detail

In this app I have 9 menu items and fragments in navigation drawer, I want to save the last opened fragment in savedInstanceState or datastore and after the user closed the app and re open it again display the last opend fragment, but I don't know which method I'll use

Navigation.findNavController(activity,nav_graph).navigate();

or

binding.navView.setNavigationItemSelectedListener(item -> false);

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout 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/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <include
        android:id="@+id/app_bar_main"
        layout="@layout/app_bar_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <com.google.android.material.navigation.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        android:background="@color/color_navigation_list_background"
        app:headerLayout="@layout/nav_header_main"
        app:menu="@menu/activity_main_drawer" />

</androidx.drawerlayout.widget.DrawerLayout>

activity_main_drawer.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:showIn="navigation_view">

    <group android:checkableBehavior="single">
        <item
            android:id="@+id/nav_home"
            android:title="@string/home"
            android:icon="@drawable/home"
            />

        <item
            android:id="@+id/nav_accessory"
            android:title="@string/accessory"
            android:icon="@drawable/necklace"
            />
        <item
            android:id="@+id/nav_arcade"
            android:title="@string/arcade"
            android:icon="@drawable/arcade_cabinet"
            />
        <item
            android:id="@+id/nav_fashion"
            android:title="@string/fashion"
            android:icon="@drawable/fashion_trend"
            />
        <item
            android:id="@+id/nav_food"
            android:title="@string/food"
            android:icon="@drawable/hamburger"
            />
        <item
            android:id="@+id/nav_heath"
            android:title="@string/heath"
            android:icon="@drawable/clinic"
            />
        <item
            android:id="@+id/nav_lifestyle"
            android:title="@string/lifestyle"
            android:icon="@drawable/yoga"
            />
        <item
            android:id="@+id/nav_sports"
            android:title="@string/sports"
            android:icon="@drawable/soccer"
            />

        <item
            android:id="@+id/nav_favorites"
            android:title="@string/favorites_posts"
            android:icon="@drawable/ic_favorite"
            />

        <item
            android:id="@+id/about"
            android:title="@string/about"
            android:icon="@drawable/about"
            />

    </group>

</menu>

nav_graph.xml

<?xml version="1.0" encoding="utf-8"?>
<navigation 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/mobile_navigation"
    app:startDestination="@id/nav_home">

    <fragment
        android:id="@+id/nav_home"
        android:name="com.blogspot.abtallaldigital.ui.HomeFragment"
        android:label="@string/home"
        tools:layout="@layout/fragment_home">
        <action
            android:id="@+id/action_nav_home_to_detailsFragment"
            app:destination="@id/detailsFragment"
            app:popUpTo="@id/nav_home" />
    </fragment>

    <fragment
        android:id="@+id/nav_accessory"
        android:name="com.blogspot.abtallaldigital.ui.AccessoryFragment"
        android:label="@string/accessory"
        tools:layout="@layout/fragment_accessory" >
        <action
            android:id="@+id/action_nav_Accessory_to_detailsFragment"
            app:destination="@id/detailsFragment" />
    </fragment>

    <fragment
        android:id="@+id/nav_arcade"
        android:name="com.blogspot.abtallaldigital.ui.ArcadeFragment"
        android:label="@string/arcade"
        tools:layout="@layout/fragment_arcade" >
        <action
            android:id="@+id/action_nav_Arcade_to_detailsFragment"
            app:destination="@id/detailsFragment" />
    </fragment>

    <fragment
        android:id="@+id/nav_fashion"
        android:name="com.blogspot.abtallaldigital.ui.FashionFragment"
        android:label="@string/fashion"
        tools:layout="@layout/fragment_fashion" >
        <action
            android:id="@+id/action_nav_Fashion_to_detailsFragment"
            app:destination="@id/detailsFragment" />
    </fragment>
    <fragment
        android:id="@+id/nav_food"
        android:name="com.blogspot.abtallaldigital.ui.FoodFragment"
        android:label="@string/food"
        tools:layout="@layout/food_fragment" >
        <action
            android:id="@+id/action_nav_Food_to_detailsFragment"
            app:destination="@id/detailsFragment" />
    </fragment>
    <fragment
        android:id="@+id/nav_heath"
        android:name="com.blogspot.abtallaldigital.ui.HeathFragment"
        android:label="@string/heath"
        tools:layout="@layout/heath_fragment" >
        <action
            android:id="@+id/action_nav_Heath_to_detailsFragment"
            app:destination="@id/detailsFragment" />
    </fragment>
    <fragment
        android:id="@+id/nav_lifestyle"
        android:name="com.blogspot.abtallaldigital.ui.LifestyleFragment"
        android:label="@string/lifestyle"
        tools:layout="@layout/lifestyle_fragment" >
        <action
            android:id="@+id/action_nav_Lifestyle_to_detailsFragment"
            app:destination="@id/detailsFragment" />
    </fragment>
    <fragment
        android:id="@+id/nav_sports"
        android:name="com.blogspot.abtallaldigital.ui.SportsFragment"
        android:label="@string/sports"
        tools:layout="@layout/sports_fragment" >
        <action
            android:id="@+id/action_nav_Sports_to_detailsFragment"
            app:destination="@id/detailsFragment" />
    </fragment>
    <dialog
        android:id="@+id/about"
        android:name="com.blogspot.abtallaldigital.ui.AboutFragment"
        android:label="about"
        tools:layout="@layout/about" />
    <fragment
        android:id="@+id/detailsFragment"
        android:name="com.blogspot.abtallaldigital.ui.DetailsFragment"
        android:label="Post details"
        tools:layout="@layout/fragment_details" >
        <argument
            android:name="postItem"
            app:argType="com.blogspot.abtallaldigital.pojo.Item" />
    </fragment>
    <fragment
        android:id="@+id/nav_favorites"
        android:name="com.blogspot.abtallaldigital.ui.FavoritesFragment"
        android:label="Favorites posts"
        tools:layout="@layout/fragment_favorites" >
        <action
            android:id="@+id/action_favoritesFragment_to_detailsFragment"
            app:destination="@id/detailsFragment" />
    </fragment>
</navigation>

MainActivity class

@AndroidEntryPoint
public class MainActivity extends AppCompatActivity {

    @SuppressWarnings("unused")
    private AppBarConfiguration mAppBarConfiguration;
    public static Utils.DataStoreRepository DATA_STORE_REPOSITORY;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ActivityMainBinding binding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());


        setSupportActionBar(binding.appBarMain.toolbar);
        mAppBarConfiguration = new AppBarConfiguration.Builder(R.id.nav_home, R.id.nav_accessory,
                R.id.nav_arcade, R.id.nav_fashion,
                R.id.nav_food, R.id.nav_heath,
                R.id.nav_lifestyle, R.id.nav_sports, R.id.about)
                .setOpenableLayout(binding.drawerLayout)
                .build();


        NavHostFragment navHostFragment = (NavHostFragment)
                getSupportFragmentManager().findFragmentById(R.id.nav_host_fragment);

        assert navHostFragment != null;
        NavController navController = navHostFragment.getNavController();

        NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
        NavigationUI.setupWithNavController(binding.navView, navController);


    }


    @Override
    public boolean onSupportNavigateUp() {
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        return NavigationUI.navigateUp(navController, mAppBarConfiguration)
                || super.onSupportNavigateUp();
    }

}


from How to open the last fragment opened after closed app and reopen it using Navigation drawer and Navigation Component

No comments:

Post a Comment