Masquer le titre après CollapsingToolbarLayout

Question

J'ai le problème suivant: J'ai créé un CollapsingToolbarLayout et en dessous du titre j'ai ajouté un TabLayout de couleur grise.

écran avec/après CollapsingToolbarLayout:

Le problème: Quand il glisse, je voudrais que TabLayout à fixer. Comment puis-je supprimer ou masquer le titre lorsque je fais glisser le contenu?

code x m l:

<android.support.design.widget.AppBarLayout 
    android:id="@+id/app_bar" 
    android:layout_width="match_parent" 
    android:layout_height="@dimen/app_bar_height" 
    android:fitsSystemWindows="true"> 

    <android.support.design.widget.CollapsingToolbarLayout 
     android:id="@+id/collapsing" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:fitsSystemWindows="true" 
     app:contentScrim="@android:color/transparent" 
     app:layout_scrollFlags="scroll|exitUntilCollapsed" 
     app:expandedTitleGravity="bottom" 
     app:expandedTitleMarginStart="48dp" 
     app:expandedTitleMarginEnd="64dp" 
     app:expandedTitleMarginBottom="70dp" 
     > 
     <ImageView 
      android:id="@+id/main.backdrop" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:scaleType="centerCrop" 
      android:fitsSystemWindows="true" 
      android:src="@drawable/backexemplo" 
      app:layout_collapseMode="parallax" 
      tools:ignore="ContentDescription" 
      /> 

     <android.support.v7.widget.Toolbar 
      android:id="@+id/toolbarPerfilEmpresa" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      app:layout_collapseMode="parallax" 
      app:popupTheme="@style/ThemeOverlay.AppCompat.Light" 
      /> 

     <android.support.design.widget.TabLayout 
      android:id="@+id/tabs" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      android:layout_gravity="bottom|end" 
      android:background="@color/colorPrimaryDark" 
      app:tabMode="fixed"> 

     </android.support.design.widget.TabLayout> 

    </android.support.design.widget.CollapsingToolbarLayout> 

</android.support.design.widget.AppBarLayout> 

code java:

public class PerfilEmpresaActivity extends AppCompatActivity { 

       private Toolbar mToolbar = null; 

       @Override 
       protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_perfil_empresa); 
        mToolbar = (Toolbar) findViewById(R.id.toolbarPerfilEmpresa); 
        // mToolbar.setLogo(R.drawable.paypal); 
        mToolbar.setTitle("NomeApp"); 

        setSupportActionBar(mToolbar); 
        getSupportActionBar().setDisplayHomeAsUpEnabled(true); 

Tanks!

Answer 1

mCollapsingToolbarLayout = view.findViewById(R.id.collapsing_toolbar); 
    mCollapsingToolbarLayout.setTitle("Title"); 
    appBarLayout = view.findViewById(R.id.app_bar); 
    appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() { 
     boolean isShow = false; 
     int scrollRange = -1; 

     @Override 
     public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) { 
      if (scrollRange == -1) { 
       scrollRange = appBarLayout.getTotalScrollRange(); 
      } 
      if (scrollRange + verticalOffset == 0) { 
       mCollapsingToolbarLayout.setTitle(" "); // Careful! There should be a space between double quote. Otherwise it won't work. 
       isShow = false; 
      } else if (!isShow) {  
       mCollapsingToolbarLayout.setTitle("Title"); 
       isShow = true; 
      } 
     } 
    }); 

Answer 2

résolu le problème:

<android.support.v7.widget.Toolbar 
      android:id="@+id/toolbarPerfilEmpresa" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      app:layout_collapseMode="parallax" 
      app:popupTheme="@style/ThemeOverlay.AppCompat.Light" 
      /> 
Add: 
android:layout_gravity="top" 
android:layout_marginBottom="48dp"