android - Main Activity toolbar not showing after hiding when attaching fragment

Question

I am attaching a fragment from a fragment that is attached to an activity and then inside the fragment i have set my custom toolbar with set setDisplayHomeUpEnabled to true. when am attaching the fragment i have set the Main activity toolbar to be hidden, the only problem is that it is not being unhidden when am returning to the parent fragment from the child fragment

package manu.apps.cartv6.Activities;


import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.google.android.material.navigation.NavigationView;
import com.google.android.material.snackbar.Snackbar;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import manu.apps.cartv6.Classes.CartCounterConverter;
import manu.apps.cartv6.Classes.Config;
import manu.apps.cartv6.Classes.Product;
import manu.apps.cartv6.Classes.UserSessionManager;
import manu.apps.cartv6.Fragments.UserProfileFragment;
import manu.apps.cartv6.Fragments.ViewProductsFragment;
import manu.apps.cartv6.Interfaces.AddRemoveCallbacks;
import manu.apps.cartv6.R;
import manu.apps.cartv6.Tests.CartFragment;

public class MainActivity extends AppCompatActivity implements View.OnClickListener, NavigationView.OnNavigationItemSelectedListener, AddRemoveCallbacks {


    /** Lists*/
    public static List<Product> cartList = new ArrayList<>();


    /** Variables*/
    // Counter for Cart
    public static int cart_count = 0;

    // Get Id for users
    String getId;

    // Time Interval for back button press
    private static final int TIME_INTERVAL = 2000; // # milliseconds, desired time passed between two back presses.

    // How long the back button has been pressed
    private long backPressed;

    //Getting Class Info
    private static final String TAG = MainActivity.class.getSimpleName();

    /** Views*/
    // Toolbars
    Toolbar toolbar;


    // TextViews
    TextView navHeaderUsername;

    // ImageViews
    ImageView navHeaderProfileImage;


    /** Session Managing*/
    UserSessionManager userSessionManager;


    /** Navigation Drawer*/
    //Declaring ActionBarDrawerToggle
    private ActionBarDrawerToggle actionBarDrawerToggle;

    //Declaring Navigation View
    NavigationView navigationView;

    //Declaring Drawer Layout
    DrawerLayout drawerLayout;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Creating a Session Manager for the Users
        userSessionManager = new UserSessionManager(this);
        userSessionManager.checkUserLogin();

        //Finding Drawer Layout
        drawerLayout = findViewById(R.id.drawer_layout);

        //Finding Navigation View
        navigationView = findViewById(R.id.navigation_view);

        //Finding Toolbar
        toolbar = findViewById(R.id.main_tool_bar);

        //Toolbar Workings
        setSupportActionBar(toolbar);
        getSupportActionBar().setTitle("Home");
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        // Setting View Products Fragment
        Fragment fragment = new ViewProductsFragment();
        getSupportFragmentManager().beginTransaction().replace(R.id.frame_layout,fragment).commit();


        //Setting ActionBarDrawerToggle to Open and Close
        actionBarDrawerToggle = new ActionBarDrawerToggle(this,drawerLayout,R.string.open,R.string.close);
        drawerLayout.addDrawerListener(actionBarDrawerToggle);
        actionBarDrawerToggle.syncState();

        // Setting Navigation Item Selected Listener for Items in Navigation View
        navigationView.setNavigationItemSelectedListener(this);


        /**
         * app:headerLayout="@layout/layout_nav_header"
         *
         * Remove the above line in NavigationView because we are inflating programmatically
         *
         * */
        View navView = navigationView.inflateHeaderView(R.layout.layout_nav_header);

        //Finding Views in Navigation Header which is inside Navigation View
        navHeaderUsername = navView.findViewById(R.id.nav_header_username);
        navHeaderProfileImage = navView.findViewById(R.id.nav_header_profile_image);

        // Parsing Username and Email
        HashMap<String, String> user = userSessionManager.getUserDetails();
        getId = user.get(userSessionManager.ID);

    }


    // Fetch User Details
    private void fetchUserDetails(){

        final ProgressDialog progressDialog = new ProgressDialog(this);
        progressDialog.setMessage("Loading...");
        //progressDialog.show();

        StringRequest stringRequest = new StringRequest(Request.Method.POST, Config.FETCH_USER_DETAILS,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        progressDialog.dismiss();
                        Log.i(TAG, response.toString());
                        try {
                            JSONObject jsonObject = new JSONObject(response);
                            String success = jsonObject.getString("success");
                            JSONArray jsonArray = jsonObject.getJSONArray("fetch");

                            if (success.equals("1")) {

                                for (int i = 0; i < jsonArray.length();i++) {
                                    JSONObject object = jsonArray.getJSONObject(i);

                                    String username = object.getString("username").trim();
                                    String email = object.getString("email").trim();


                                    // Set Details for the Navigation Header
                                    navHeaderUsername.setText(username);


                                    //etProfileUsername.setText(username);
                                    //etProfileEmail.setText(email);

                                }
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                            progressDialog.dismiss();
                            Toast.makeText(MainActivity.this, "JSON Error fetching Details", Toast.LENGTH_SHORT).show();
                            Snackbar.make(getWindow().getDecorView().getRootView(),e.toString(),Snackbar.LENGTH_LONG).show();
                        }
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        progressDialog.dismiss();
                        Toast.makeText(MainActivity.this, "Volley Error fetching Details", Toast.LENGTH_SHORT).show();
                        Snackbar.make(getWindow().getDecorView().getRootView(),error.toString(),Snackbar.LENGTH_LONG).show();
                    }
                })
        {
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                Map<String, String > params = new HashMap<>();
                params.put("id", getId);
                return params;
            }
        };

        RequestQueue requestQueue = Volley.newRequestQueue(this);
        requestQueue.add(stringRequest);
    }


    public static String numberFormatter(double d) {
        DecimalFormat decimalFormat = new DecimalFormat("#,###.##");
        return decimalFormat.format(d);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        MenuInflater menuInflater = getMenuInflater();
        menuInflater.inflate(R.menu.user_toolbar_menu_items, menu);

        MenuItem cartItem = menu.findItem(R.id.cart_action);

        cartItem.setIcon(CartCounterConverter.convertLayoutToImage(MainActivity.this,cart_count,R.drawable.view_cart_icon));

        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        // Check if Action Bar Drawer Toggle has been selected
        if(actionBarDrawerToggle.onOptionsItemSelected(item)){
            return true;
        }


        switch (item.getItemId()) {
            case R.id.cart_action:
                //startActivity(new Intent(MainActivity.this,CartActivity.class));
                Fragment fragment = new CartFragment();
                getSupportFragmentManager().beginTransaction().replace(R.id.frame_layout,fragment).commit();
                getSupportActionBar().hide();
                break;
            case R.id.logout_action:
                userSessionManager.logOutUser();
                finish();
                default:
                    break;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {

        Fragment fragment = null;

        /*switch (item.getItemId()) {
            case R.id.action_category_one:
                Toast.makeText(this, "Under Development", Toast.LENGTH_SHORT).show();
                break;
            case R.id.action_profile:
                fragment = new UserProfileFragment();
                break;
        }*/

        int id = item.getItemId();

        if (id == R.id.action_view_products) {
            fragment = new ViewProductsFragment();
        }
//        else if (id == R.id.action_receipts) {
//        }

        else if (id == R.id.action_profile) {
            //startActivity(new Intent(MainActivity.this,UserProfileActivity.class));
            fragment = new UserProfileFragment();
        }
        if (fragment !=null) {
            FragmentManager fragmentManager = getSupportFragmentManager();
            FragmentTransaction ft = fragmentManager.beginTransaction();
            //R.id."  " will be found in content_main.xml from the Frame Layout
            ft.replace(R.id.frame_layout,fragment);
            ft.commit();
        }

        drawerLayout.closeDrawer(GravityCompat.START);
        return true;
    }

    @Override
    public void onClick(View v) {

    }

    // When back button is pressed method
    @Override
    public void onBackPressed() {

        //Check if navigation drawer is opened or closed
        if (drawerLayout.isDrawerOpen(GravityCompat.START)){
            drawerLayout.closeDrawer(GravityCompat.START);
        }else {

            if (backPressed + TIME_INTERVAL > System.currentTimeMillis()) {
                super.onBackPressed();
                return;
            } else {
                Toast.makeText(getBaseContext(), "Press back button again to exit", Toast.LENGTH_SHORT).show();
            }

            backPressed = System.currentTimeMillis();
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        fetchUserDetails();

    }

    // Remember to implement AddRemoveCallback Interface
    @Override
    public void onAddProduct() {
        cart_count++;
        invalidateOptionsMenu();
    }

    // Remember to implement AddRemoveCallback Interface
    @Override
    public void onRemoveProduct() {
        cart_count--;
        invalidateOptionsMenu();
    }
}

My child fragment

package manu.apps.cartv6.Tests;


import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.widget.Toolbar;
import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import manu.apps.cartv6.Activities.MainActivity;
import manu.apps.cartv6.Fragments.ViewProductsFragment;
import manu.apps.cartv6.R;

/**
 * A simple {@link Fragment} subclass.
 */
public class CartFragment extends Fragment {

    Toolbar fragmentCartToolbar;


    public CartFragment() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //((MainActivity) getActivity()).getSupportActionBar().hide();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        setHasOptionsMenu(true);

        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_cart, container, false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        fragmentCartToolbar = view.findViewById(R.id.fragment_cart_tool_bar);

        ((MainActivity) getActivity()).setSupportActionBar(fragmentCartToolbar);

        ((MainActivity) getActivity()).getSupportActionBar().setTitle("Blank Fragment");

        ((MainActivity) getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        ((MainActivity) getActivity()).getSupportActionBar().setDisplayShowHomeEnabled(true);

        final Toolbar bar = (Toolbar) getActivity().findViewById(R.id.main_tool_bar);

        fragmentCartToolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                ((MainActivity) getActivity()).setSupportActionBar(bar);

                //((MainActivity) getActivity()).getSupportActionBar().show();

                Fragment fragment = new ViewProductsFragment();
                getActivity().getSupportFragmentManager().beginTransaction().replace(R.id.frame_layout,fragment).commit();

            }
        });

    }

}

The problem is that the moment i add setNavigationOnClickListener the Main Activity toolbar doesn't show again when i remove it, it shows perfectly

 @Override
    public void onResume() {
        super.onResume();

        ((MainActivity)getActivity()).getSupportActionBar().hide();

        ((MainActivity) getActivity()).setSupportActionBar(fragmentCartToolbar);

        ((MainActivity) getActivity()).getSupportActionBar().setTitle("Blank Fragment");

        ((MainActivity) getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        //((MainActivity) getActivity()).getSupportActionBar().setDisplayShowHomeEnabled(true);

        fragmentCartToolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Fragment fragment = new ViewProductsFragment();
                getActivity().getSupportFragmentManager().beginTransaction().replace(R.id.frame_layout,fragment).commit();

            }
        });


    }

标签： androidandroid-fragmentstoolbar

Answer 1

Please try to add below in your parent fragment's onResume(), I guess it's ViewProductsFragment from the provided code.

This will allow you to hide the action bar from the fragment itself rather than the activity.

@Override
public void onResume() {
    super.onResume();
    ((AppCompatActivity)getActivity()).getSupportActionBar().hide();
}