ナビゲーションアイテムメニューがクリックされたときのツールバーのタイトルの設定

Question

私のアプリでは、次のナビゲーションビューがあります。ユーザーがメニュー項目Καλώςήρθες（ギリシャ語で意味歓迎）をクリックしたときに

だから、私は、これがツールバーに表示されたいです。これはナビゲーションビューのコードです。

public class Welcome extends AppCompatActivity { 
private NavigationView navigationView; 
private DrawerLayout drawerLayout; 
private SessionManager session; 
Toolbar toolbar; 
private int mIconSize; 
private String username; 


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

    session = new SessionManager(getApplicationContext()); 



    SharedPreferences userName = PreferenceManager.getDefaultSharedPreferences(this); 
    //UserId = userName.getString("id",""); 
    username = userName.getString("user_name", ""); 



    toolbar = (Toolbar)findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    drawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout); 

    if (savedInstanceState == null) { 
     //Restore the fragment's instance and geo coordinates! 
     //homeFragment = (FragmentHome) getSupportFragmentManager().getFragment(savedInstanceState, "mContent"); 
     setSelected(R.id.welcome); 
    }else{ 
     //profileFragment = (FragmentProfile) fm2.findFragmentByTag(PROFILE_FRAGMENT); 

    } 
    ActionBarDrawerToggle adt = new ActionBarDrawerToggle(this,drawerLayout,toolbar, 
      R.string.open_drawer,R.string.close_drawer){ 
     @Override 
     public void onDrawerClosed(View drawerView) { 
      super.onDrawerClosed(drawerView); 
     } 

     @Override 
     public void onDrawerOpened(View drawerView) { 
      super.onDrawerOpened(drawerView); 
     } 
    }; 

    drawerLayout.addDrawerListener(adt); 
    adt.syncState(); 
    navigationView = (NavigationView)findViewById(R.id.navigation_view); 
    navigationView.setBackgroundColor(getResources().getColor(R.color.navigation_bg_color)); 
    navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() { 
     @Override 
     public boolean onNavigationItemSelected(MenuItem item) { 
      drawerLayout.closeDrawers(); 
      boolean result = setSelected(item.getItemId()); 
      return result; 
     } 
    }); 

    View v = navigationView.getHeaderView(0); 
    TextView t = (TextView)v.findViewById(R.id.username); 
    t.setText(username); 
} 
@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    MenuInflater inflater = getMenuInflater(); 
    inflater.inflate(R.menu.log_out, menu); 
    return true; 
} 
@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    switch (item.getItemId()) { 
     case R.id.log_out: 

      logoutUser(); 
      return true; 
    } 
    return super.onOptionsItemSelected(item); 
} 
private void logoutUser() { 
    session.setLogin(false); 

    // Launching the login activity 
    Intent intent = new Intent(Welcome.this, MainActivity.class); 
    startActivity(intent); 
    finish(); 
} 
public boolean setSelected(int selected) { 
    switch (selected){ 
     case R.id.welcome: 
      WelcomeFragment welcomeFragment = new WelcomeFragment(); 
      FragmentManager fm1 = getSupportFragmentManager(); 
      FragmentTransaction fragmentTra1 = fm1.beginTransaction(); 
      fragmentTra1.replace(R.id.content,welcomeFragment); 
      //fragmentTra1.addToBackStack("added"); 

      fragmentTra1.commit(); 
     return true; 
     case R.id.general: 
      GeneralFragment generalFragment= new GeneralFragment(); 
      FragmentManager fm2 = getSupportFragmentManager(); 
      FragmentTransaction fragmentTra2 = fm2.beginTransaction(); 
      fragmentTra2.replace(R.id.content,generalFragment); 
      //fragmentTra1.addToBackStack("added"); 

      fragmentTra2.commit(); 
      return true; 
     case R.id.announcements: 
      AnnouncementsFragment announcementsFragment= new AnnouncementsFragment(); 
      FragmentManager fm3 = getSupportFragmentManager(); 
      FragmentTransaction fragmentTraSubOne = fm3.beginTransaction(); 
      fragmentTraSubOne.replace(R.id.content,announcementsFragment); 
      //fragmentTra1.addToBackStack("added"); 

      fragmentTraSubOne.commit(); 
      return true; 
     case R.id.sub_one: 
      NewsFragment newsFragment= new NewsFragment(); 
      FragmentManager fm4 = getSupportFragmentManager(); 
      FragmentTransaction fragmentTraSubTwo = fm4.beginTransaction(); 
      fragmentTraSubTwo.replace(R.id.content,newsFragment); 
      //fragmentTra1.addToBackStack("added"); 

      fragmentTraSubTwo.commit(); 
      return true; 
     case R.id.sub_two: 
      FanClubFragment fanClubFragment= new FanClubFragment(); 
      FragmentManager fm5 = getSupportFragmentManager(); 
      FragmentTransaction fragmentTraSubThree = fm5.beginTransaction(); 
      fragmentTraSubThree.replace(R.id.content,fanClubFragment); 
      //fragmentTra1.addToBackStack("added"); 
      fragmentTraSubThree.commit(); 
      return true; 
    } 

    return false; 
} 
public static Intent newIntent(Context context) { 

    return new Intent(context,MainActivity.class); 
} 
@Override 
public void onBackPressed() { 
    if(isNavDrawerOpen()){ 
     closeDrawerLayout(); 
    }else { 
     super.onBackPressed(); 
    } 
} 

public boolean isNavDrawerOpen() { 
    return drawerLayout!=null && drawerLayout.isDrawerOpen(GravityCompat.START); 
} 
private void closeDrawerLayout(){ 
    if(drawerLayout != null){ 
     drawerLayout.closeDrawer(GravityCompat.START); 
    } 
} 
@Override 
public boolean onKeyDown(int keyCode, KeyEvent event) 
{ 
    return (keyCode == KeyEvent.KEYCODE_BACK ? true :  
    super.onKeyDown(keyCode, event)); 
} 
} 

ありがとう、

Theo。

Answer 1

setTitle()使用してみてください：

public boolean setSelected(int selected) { 
    switch (selected){ 
      case R.id.welcome: 
       toolbar.setTitle("Welcome"); 
       ...... 
      } 
    ..... 
} 

Answer 2

使用してみてください：

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    MenuItem item = menu.add(Menu.NONE, ID, POSITION, TEXT); 
    item.setIcon(R.drawable.drawable_resource_name); 
    item.setShowAsAction(MenuItem.SHOW_AS_ACTION_WITH_TEXT); 

    return true; 
} 

：スイッチ-場合

getSupportActionBar().setTitle("title"); 

Answer 3

は、私はあなたがこのようなものを使用することができると思いますまた、thリンクは役立つかもしれないです： Here

はそれがお役に立てば幸いです。）

ところで、あなたのアプリが素晴らしいですね！