Android导航抽屉集标题

Question

I want to change the title of my Navigation Drawer when a user clicks on the particular fragment of the navigation drawer. I'm new to the world of Android Programming. So please kindly help Below is my code

Main Activity Code

    package com.androidbelieve.HIT_APP;

import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity{
    DrawerLayout mDrawerLayout;
    NavigationView mNavigationView;
    FragmentManager mFragmentManager;
    FragmentTransaction mFragmentTransaction;

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

        /**
         *Setup the DrawerLayout and NavigationView
         */

        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
        mNavigationView = (NavigationView) findViewById(R.id.shitstuff) ;




        /**
         * Lets inflate the very first fragment
         * Here , we are inflating the TabFragment as the first Fragment
         */

        mFragmentManager = getSupportFragmentManager();
        mFragmentTransaction = mFragmentManager.beginTransaction();
        // mFragmentTransaction.replace(R.id.containerView,new TabFragment()).commit();
        mFragmentTransaction.replace(R.id.containerView,new HomeFragment()).commit();


        /**
         * Setup click events on the Navigation View Items.
         */

        mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(MenuItem menuItem) {
                mDrawerLayout.closeDrawers();




              if (menuItem.getItemId() == R.id.nav_item_home) {
                    FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
                    fragmentTransaction.replace(R.id.containerView,new HomeFragment()).commit();

                }

                if (menuItem.getItemId() == R.id.nav_item_dept) {
                    FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
                    fragmentTransaction.replace(R.id.containerView,new DeptFragment()).commit();

                }

                if (menuItem.getItemId() == R.id.nav_item_facility) {
                    FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
                    fragmentTransaction.replace(R.id.containerView,new FacilityFragment()).commit();

                }

                if (menuItem.getItemId() == R.id.nav_item_placement) {
                    FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
                    fragmentTransaction.replace(R.id.containerView,new PlacementFragment()).commit();

                }

                if (menuItem.getItemId() == R.id.nav_item_gallery) {
                    FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
                    fragmentTransaction.replace(R.id.containerView,new GalleryFragment()).commit();

                }

                if (menuItem.getItemId() == R.id.nav_item_developer) {
                    FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
                    fragmentTransaction.replace(R.id.containerView,new DeveloperFragment()).commit();

                }



                if (menuItem.getItemId() == R.id.nav_item_near) {
                    FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
                    fragmentTransaction.replace(R.id.containerView,new NearFragment()).commit();

                }


                if (menuItem.getItemId() == R.id.nav_item_notify) {
                    FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
                    fragmentTransaction.replace(R.id.containerView,new NotifyFragment()).commit();

                }

                if (menuItem.getItemId() == R.id.nav_item_vtu) {
                    FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction();
                    xfragmentTransaction.replace(R.id.containerView,new TabFragment()).commit();
                }


                return false;

            }



        });

        /**
         * Setup Drawer Toggle of the Toolbar
         */

        android.support.v7.widget.Toolbar toolbar = (android.support.v7.widget.Toolbar) findViewById(R.id.toolbar);
        ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle(this,mDrawerLayout, toolbar,R.string.app_name,
                R.string.app_name);

        mDrawerLayout.setDrawerListener(mDrawerToggle);

        mDrawerToggle.syncState();

    }
}

I think something needs to be done here itself when a person selects any of the drawer items.

Any other piece of code required let me know

Answer 1

move variable of android.support.v7.widget.Toolbar toolbar = (android.support.v7.widget.Toolbar) findViewById(R.id.toolbar); above just after setContentView in onCreate method of your activity & make it final .

when user select navigation drawer set title of ToolBar in onNavigationItemSelected like below.

if (menuItem.getItemId() == R.id.nav_item_home) {
   FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
   fragmentTransaction.replace(R.id.containerView,new HomeFragment()).commit();
   toolbar.setTitle("Your Fragment Name");
   }

---

to set ICON you can use

toolbar.setLogo(ContextCompat.getDrawable(MainActivity.this, R.drawable.cheese_1));