El título de CollapsingToolbarLayout desaparece

Tengo un CollapsingToolBarLayout.When el cajón de la navegación cierra, el título en la barra de herramientas desaparece. Esto sucede solamente cuando la barra de herramientas está en estado colapsado. Mientras que en el estado ampliado el título sigue siendo. He comprobado el código Pero soy incapaz de encontrar el insecto. Aquí está mi código para la actividad principal: –

import android.support.design.widget.CollapsingToolbarLayout; import android.support.design.widget.CoordinatorLayout; import android.support.v4.view.ViewPager; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBar; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import com.defcomm.invento.NavigationDrawerActivity; import android.support.v4.widget.NestedScrollView; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.Toolbar; import android.view.Menu; import android.view.MenuItem; public class INVENTO extends AppCompatActivity { private Toolbar toolbar; private CoordinatorLayout mCoordinator; private CollapsingToolbarLayout mCollapsableLayout; private NestedScrollView nestedScrollView; private ViewPager mPager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_new); mCoordinator= (CoordinatorLayout) findViewById(R.id.coordinator_layout); mCollapsableLayout = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar); toolbar= (Toolbar) findViewById(R.id.appbar); setSupportActionBar(toolbar); getSupportActionBar().setDisplayShowHomeEnabled(true); mCollapsableLayout.setTitle(getResources().getString(R.string.app_name)); nestedScrollView= (NestedScrollView) findViewById(R.id.rvToDoList); mCollapsableLayout.setExpandedTitleColor(getResources().getColor(R.color.textColor)); mCollapsableLayout.setCollapsedTitleTextColor(getResources().getColor(R.color.textColor)); NavigationDrawerActivity drawerFragment= (NavigationDrawerActivity) getSupportFragmentManager(). findFragmentById(R.id.navigation_drawer); drawerFragment.setUp(R.id.navigation_drawer, (DrawerLayout) findViewById(R.id.drawerlayout), toolbar); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_invento, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } 

Actividad principal archivo xml: –

• Animación ActionBarDrawerToggle
• Alternar el cajón de navegación 'abrir' en el botón / clic de imagen
• Eliminación del margen izquierdo del ícono de navegación de Android
• Adaptador personalizado para cajón de navegación
• ¿Cómo crear una lista desplegable dentro de un cajón de navegación (en Android)?

  <android.support.v4.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/drawerlayout" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.defcomm.invento.INVENTO"> <android.support.design.widget.CoordinatorLayout android:id="@+id/coordinator_layout" android:layout_width="match_parent" android:layout_height="match_parent" > <android.support.design.widget.AppBarLayout android:id="@+id/app_bar_layout" android:layout_width="match_parent" android:layout_height="wrap_content" > <android.support.design.widget.CollapsingToolbarLayout android:id="@+id/collapsing_toolbar" android:layout_width="match_parent" android:layout_height="200dp" android:fitsSystemWindows="true" android:background="#3f51b5" app:contentScrim="@color/primaryColor" app:expandedTitleMarginEnd="64dp" app:expandedTitleMarginStart="48dp" app:layout_scrollFlags="scroll|exitUntilCollapsed"> <ImageView android:id="@+id/imageview" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="centerCrop" android:src="@drawable/index" app:layout_collapseMode="parallax" /> <android.support.v7.widget.Toolbar android:id="@+id/appbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" app:layout_scrollFlags="scroll|enterAlways" android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" app:layout_collapseMode="pin"/> </android.support.design.widget.CollapsingToolbarLayout> </android.support.design.widget.AppBarLayout> <android.support.v4.widget.NestedScrollView android:id="@+id/rvToDoList" android:layout_width="match_parent" android:layout_height="match_parent" app:layout_behavior="@string/appbar_scrolling_view_behavior"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum." android:textSize="26sp" android:background="@android:color/white" android:padding="5dp" /> </android.support.v4.widget.NestedScrollView> <fragment android:id="@+id/navigation_drawer" android:name="com.defcomm.invento.NavigationDrawerActivity" android:layout_width="@dimen/drawer_width" android:layout_height="match_parent" android:layout_gravity="start" app:layout="@layout/fragment_navigation_drawer" tools:layout="@layout/fragment_navigation_drawer" /> </android.support.design.widget.CoordinatorLayout> </android.support.v4.widget.DrawerLayout> } 

Mi archivo java de navegación: –

  import android.content.Context; import android.content.SharedPreferences; import android.content.res.Configuration; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.design.widget.CoordinatorLayout; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBar; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.Toolbar; import android.view.LayoutInflater; import android.support.design.widget.CollapsingToolbarLayout; import android.view.View; import android.view.ViewGroup; public class NavigationDrawerActivity extends Fragment { private ActionBarDrawerToggle mdrawerToggle; private DrawerLayout mdrawerLayout; private boolean mUserLearnedState; private CoordinatorLayout mcoordinator; private CollapsingToolbarLayout collapsingToolbarLayout; View containerId; public static final String file_pref_name = "Testpef"; public static final String KEY_USER_VALUE = "user_learned_drawer"; private boolean mfromSavedInstanceState; public NavigationDrawerActivity() { // Required empty public constructor } @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); mUserLearnedState = Boolean.valueOf(readPreference(getActivity(), KEY_USER_VALUE, "false")); if (savedInstanceState != null) { mfromSavedInstanceState = true; } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment View layout=inflater.inflate(R.layout.fragment_navigation_drawer, container, false); //recyclerview= (RecyclerView) layout.findViewById(R.id.recycler); return layout; } public void setUp(final int fragmentId, DrawerLayout drawerlayout, final Toolbar toolbar) { mdrawerLayout = drawerlayout; containerId = getActivity().findViewById(fragmentId); mdrawerToggle = new ActionBarDrawerToggle(getActivity(), drawerlayout, toolbar, R.string.drawer_open, R.string.drawer_close) { @Override public void onDrawerOpened(View drawerView) { super.onDrawerOpened(drawerView); if (!mUserLearnedState) { mUserLearnedState = true; saveToPreference(getActivity(), KEY_USER_VALUE, mUserLearnedState + ""); } getActivity().invalidateOptionsMenu(); toolbar.setTitle(getResources().getString(R.string.app_name)); } @Override public void onDrawerClosed(View drawerView) { super.onDrawerClosed(drawerView); getActivity().invalidateOptionsMenu(); toolbar.setTitle(getResources().getString(R.string.app_name)); } @Override public void onDrawerSlide(View drawerView, float slideOffset) { if (slideOffset < 0.5f) { toolbar.setAlpha(1 - slideOffset); } } }; if (!mUserLearnedState && !mfromSavedInstanceState) { mdrawerLayout.openDrawer(containerId); } mdrawerLayout.setDrawerListener(mdrawerToggle); mdrawerLayout.post(new Runnable() { @Override public void run() { mdrawerToggle.syncState(); } }); } public static void saveToPreference(Context context, String preferenceName, String preferenceValue) { SharedPreferences shared = context.getSharedPreferences(file_pref_name, Context.MODE_PRIVATE); SharedPreferences.Editor editor = shared.edit(); editor.putString(preferenceName, preferenceValue); editor.apply(); } public static String readPreference(Context context, String preferenceName, String defaultValue) { SharedPreferences share = context.getSharedPreferences(file_pref_name, Context.MODE_PRIVATE); return share.getString(preferenceName, defaultValue); } }