android - 在 CollapsingToolbarLayout 后隐藏标题

Question

我有以下问题:我创建了一个 CollapsingToolbarLayout 并在标题下方添加了一个灰色的 TabLayout。

在 CollapsingToolbarLayout 之后/之后的屏幕:

问题:当它滑动时，我只想修复 TabLayout。滑动内容时如何去除或隐藏标题？

代码 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>

代码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);

坦克!

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;
            }
        }
    });