折叠AppBarLayout不使用TabLayout和NestedScrollView滚动

Question

我在滚动折叠AppBar时遇到问题，当我尝试滚动它触摸AppBarLayout部分时。而且它有时滚动不顺畅。

以下是短片（1分30秒）的问题视频：https://www.youtube.com/watch?v=n32N9Z4S3SA&feature=youtu.be

以下是简单项目的链接（仅限github上的此问题）： https://github.com/yozhik/Reviews/tree/master/app/src/main/java/com/ylet/sr/review

我正在使用： com.android.support:appcompat-v7:27.1.1

异地存在问题：https://issuetracker.google.com/issues/37050152

它是怎样的：https://www.youtube.com/watch?v=xWadOVEaTSY&feature=youtu.be

应该如何：https://www.youtube.com/watch?v=J8ITp6RusZo&feature=youtu.be

有人知道如何解决您在视频中看到的这个问题吗？我创建了绝对简单的布局以避免任何副作用，但bug仍然可以复制。提前谢谢。

说明

CollapsingActivity - Collapsing AppBarLayout的活动。将一个或两个片段加载到＆＃34; fragment_content_holder＆＃34;它有TabLayout 在视图寻呼机中切换片段。

在活动方法onCreate()中 - 我只是模拟对服务器的请求（loadData），并且当加载了一些假数据时 - 我在第一次调用时在视图寻呼机中显示片段 - 我正在创建新的TabMenuAdapter extends FragmentPagerAdapter，用片段填充它并保存到实例的链接。在接下来的电话 - 我不是从头开始创建片段，只是用新数据填充它们。

MenuFragment1, MenuFragment1 - 两个片段。 MenuFragment1 - 方法public void setupData(SomeCustomData data)，用于设置新数据，而不是在网络重新连接时重新创建片段。

NetworkStateReceiver - 收听网络更改并发送通知。

TabMenuAdapter - 只是举行片段的简单类。

接下来只是复制/粘贴代码：

public class CollapsingActivity extends AppCompatActivity implements ChangeNetworkNotification {
    private static int dataReloadIteration = 0;
    private SomeCustomData dummyDataFromServer;

    @BindView(R.id.root_layout)
    CoordinatorLayout root_layout;

    @BindView(R.id.app_bar_layout)
    AppBarLayout app_bar_layout;

    @BindView(R.id.collapsing_toolbar_layout)
    CollapsingToolbarLayout collapsing_toolbar_layout;

    @BindView(R.id.view_pager_layout)
    ViewPager viewPager;

    @BindView(R.id.tab_layout)
    TabLayout tabLayout;

    @BindView(R.id.collapsing_data_1_txt)
    TextView collapsing_data_1_txt;

    private NetworkStateReceiver networkStateReceiver;
    private boolean isConnected;

    protected Fragment currentFragment;
    protected Fragment previousFragment;
    protected FragmentManager fragmentManager;

    private boolean dataLoading = false;
    private boolean isCreated = false;

    private MenuFragment1 menu1Fragment1;
    private MenuFragment2 menu1Fragment2;
    private TabMenuAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        Log.d("TEST", "CollapsingActivity.onCreate");
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_collapsing);
        ButterKnife.bind(this);

        fragmentManager = getSupportFragmentManager();

        networkStateReceiver = new NetworkStateReceiver();
        networkStateReceiver.setNetworkReceiver(this);

        IntentFilter intentFilterForNetwork = new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE");
        registerReceiver(networkStateReceiver, intentFilterForNetwork);

        initToolbar();
        loadData();
    }

    @Override
    protected void onStart() {
        Log.d("TEST", "CollapsingActivity.onStart");
        super.onStart();
        IntentFilter intentFilterForNetwork = new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE");
        registerReceiver(networkStateReceiver, intentFilterForNetwork);
    }

    private void initToolbar() {
        Log.d("TEST", "CollapsingActivity.initToolbar");
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar_layout);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayShowTitleEnabled(false);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }

    private void loadData() {
        Log.d("TEST", "CollapsingActivity.loadData");
        dataLoading = true;
        Thread t = new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(CollapsingActivity.this, "Data loaded.", Toast.LENGTH_SHORT).show();
                        Log.d("TEST", "CollapsingActivity.Data loaded.");
                        dataReloadIteration++;
                        dummyDataFromServer = getDummyObjectFromServer();

                        collapsing_data_1_txt.setText(dummyDataFromServer.Name); //Set data from server in collapsing part of Activity

                        boolean showOneView = false;
                        if (showOneView) {
                            initSingleView();
                        } else {
                            if (!isCreated) {
                                initTabView();
                            } else {
                                menu1Fragment1.setupData(dummyDataFromServer);  //Set the data from server to fragment, not reloading it, just updating data
                            }
                        }
                        dataLoading = false;
                    }
                });
            }
        });
        t.start();
    }

    private SomeCustomData getDummyObjectFromServer() {
        SomeCustomData dto = new SomeCustomData();
        dto.Age = dataReloadIteration;
        dto.Name = "Name " + dataReloadIteration;
        return dto;
    }

    private void initSingleView() {
        Log.d("TEST", "CollapsingActivity.initSingleView");
        tabLayout.setVisibility(View.GONE);
        viewPager.setVisibility(View.GONE);
        showFragmentWithoutBackStack(R.id.fragment_content_holder, new MenuFragment1());
    }

    private void initTabView() {
        if (!isCreated) {
            Log.d("TEST", "CollapsingActivity.initTabView");
            tabLayout.setVisibility(View.VISIBLE);
            viewPager.setVisibility(View.VISIBLE);

            setupViewPager(viewPager);
            tabLayout.setupWithViewPager(viewPager);
            isCreated = true;
        }
    }

    private void setupViewPager(ViewPager viewPager) {
        Log.d("TEST", "CollapsingActivity.setupViewPager");
        menu1Fragment1 = MenuFragment1.newInstance(dummyDataFromServer);
        menu1Fragment2 = MenuFragment2.newInstance();

        adapter = new TabMenuAdapter(getSupportFragmentManager());
        adapter.addFragment(menu1Fragment1, "Menu 1");
        adapter.addFragment(menu1Fragment2, "Menu 2");
        viewPager.setAdapter(adapter);
    }

    @Override
    protected void onDestroy() {
        Log.d("TEST", "CollapsingActivity.onDestroy");
        super.onDestroy();
        unregisterReceiver(networkStateReceiver);
    }

    @Override
    public void networkStateIsChanged(boolean isConnected) {
        this.isConnected = isConnected;
        Log.d("TEST", "CollapsingActivity.networkStateIsChanged.isConnected: " + isConnected);
        if (isConnected) {
            Toast.makeText(CollapsingActivity.this, "Connection received.", Toast.LENGTH_SHORT).show();
            if (!dataLoading) {
                loadData();
            }
        } else {
            Toast.makeText(CollapsingActivity.this, "Connection lost.", Toast.LENGTH_SHORT).show();
        }
    }

    protected void showFragmentWithoutBackStack(int containerViewId, Fragment fragment) {
        Log.d("TEST", "CollapsingActivity.showFragmentWithoutBackStack");
        previousFragment = currentFragment;
        currentFragment = fragment;
        String fragmentTag = fragment.getClass().getSimpleName();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
        if (previousFragment != null) {
            fragmentTransaction.remove(previousFragment);
        }
        fragmentTransaction.add(containerViewId, fragment, fragmentTag)
                .commitNowAllowingStateLoss();
    }
}

活动的布局：

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/root_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:animateLayoutChanges="false"
        android:background="@color/white"
        android:stateListAnimator="@drawable/appbar_shadow"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/green"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            app:title=""
            app:titleEnabled="false">

            <include
                layout="@layout/appbar_collapsing_part"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="?attr/actionBarSize"
                app:layout_scrollFlags="scroll|exitUntilCollapsed" />


            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar_layout"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="@color/green"
                android:stateListAnimator="@drawable/appbar_shadow"
                app:layout_collapseMode="pin"
                app:popupTheme="@style/AppTheme.PopupOverlay"
                app:theme="@style/ToolbarMenuItemsBackGroundTheme">

                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">

                    <TextView
                        android:id="@+id/title_txt"
                        android:layout_width="wrap_content"
                        android:layout_height="match_parent"
                        android:layout_alignParentStart="true"
                        android:layout_toStartOf="@+id/star_img"
                        android:ellipsize="end"
                        android:fontFamily="sans-serif-medium"
                        android:gravity="center_vertical"
                        android:maxLines="1"
                        android:textColor="@color/colorPrimaryDark"
                        android:textSize="19sp" />

                    <ImageView
                        android:id="@+id/star_img"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignParentEnd="true"
                        android:layout_centerInParent="true"
                        android:layout_gravity="center"
                        android:layout_marginEnd="24dp"
                        android:padding="10dp"
                        android:src="@drawable/ic_favorite_filled" />

                </RelativeLayout>

            </android.support.v7.widget.Toolbar>

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

        <android.support.design.widget.TabLayout
            android:id="@+id/tab_layout"
            android:layout_width="wrap_content"
            android:layout_height="48dp"
            android:layout_marginLeft="16dp"
            android:layout_marginRight="16dp"
            android:background="#45b0b2"
            android:visibility="gone"
            app:tabBackground="@drawable/backgr_blue_transparent_selector"
            app:tabGravity="center"
            app:tabIndicatorColor="@color/colorPrimaryDark"
            app:tabIndicatorHeight="2dp"
            app:tabMinWidth="500dp"
            app:tabMode="fixed"
            app:tabSelectedTextColor="@color/colorPrimaryDark"
            app:tabTextAppearance="@style/CustomTabLayout"
            app:tabTextColor="@color/green" />

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


    <FrameLayout
        android:id="@+id/fragment_content_holder"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/blue"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    <android.support.v4.view.ViewPager
        android:id="@+id/view_pager_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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

片段1：

public class MenuFragment1 extends Fragment {

    public SomeCustomData transferedDataFromActivity;
    private TextView data_1_txt;

    public static MenuFragment1 newInstance(SomeCustomData data) {
        Log.d("TEST", "MenuFragment1.newInstance");
        MenuFragment1 fragment = new MenuFragment1();

        Bundle args = new Bundle();
        args.putSerializable("DATA_FROM_ACTIVITY", data);
        fragment.setArguments(args);

        return fragment;
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d("TEST", "MenuFragment1.onCreate");

        if (getArguments() != null) {
            this.transferedDataFromActivity = (SomeCustomData) getArguments().getSerializable("DATA_FROM_ACTIVITY");
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        Log.d("TEST", "MenuFragment1.onCreateView");
        View v = inflater.inflate(R.layout.menu_fragment_1, container, false);
        data_1_txt = (TextView) v.findViewById(R.id.data_1_txt);

        setupInOnCreateView();

        return v;
    }

    protected void setupInOnCreateView() {
        Log.d("TEST", "MenuFragment1.setupInOnCreateView");
        //initialization of all view elements of layout with data is happens here.
        setupData(transferedDataFromActivity);
    }

    public void setupData(SomeCustomData data) {
        Log.d("TEST", "MenuFragment1.setupData");
        this.transferedDataFromActivity = data;
        if (transferedDataFromActivity != null) {
            data_1_txt.setText(transferedDataFromActivity.Name);
        }
    }
}

片段1布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/green"
    android:orientation="vertical">

    <TextView
        android:id="@+id/data_1_txt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/yellow"
        android:text="Test"
        android:textSize="20sp" />

    <include layout="@layout/description_layout" />

</LinearLayout>

片段2：

public class MenuFragment2 extends Fragment {

    public static MenuFragment2 newInstance() {
        Log.d("TEST", "MenuFragment2.newInstance");
        MenuFragment2 fragment = new MenuFragment2();
        return fragment;
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        Log.d("TEST", "MenuFragment2.onCreateView");
        View v = inflater.inflate(R.layout.menu_fragment_2, container, false);

        setupInOnCreateView();

        return v;
    }

    protected void setupInOnCreateView() {
        Log.d("TEST", "MenuFragment2.setupInOnCreateView");
        //initialization of all view elements of layout with data is happens here.
    }
}

片段2布局：

<?xml version="1.0" encoding="utf-8"?>

<android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/comments_scrollable_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:visibility="visible">

    <LinearLayout
        android:id="@+id/comments_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:background="@color/yellow" />

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:background="@color/blue" />

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:background="@color/yellow" />

    </LinearLayout>


</android.support.v4.widget.NestedScrollView>

TabMenuAdapter：

public class TabMenuAdapter extends FragmentPagerAdapter {
    private final List<Fragment> mFragments = new ArrayList<>();
    private final List<String> mFragmentTitles = new ArrayList<>();

    public TabMenuAdapter(FragmentManager fm) {
        super(fm);
    }

    public void addFragment(Fragment fragment, String title) {
        mFragments.add(fragment);
        mFragmentTitles.add(title);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragments.get(position);
    }

    @Override
    public int getCount() {
        return mFragments.size();
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitles.get(position);
    }

}

Answer 1

为您的活动尝试以下布局

  <?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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/root_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:animateLayoutChanges="false"
        android:background="@color/white"
        android:stateListAnimator="@drawable/appbar_shadow"
        android:theme="@style/AppTheme.AppBarOverlay"
        tools:targetApi="lollipop">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/green"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            app:title=""
            app:titleEnabled="false">

            <include
                layout="@layout/appbar_collapsing_part"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="?attr/actionBarSize"
                app:layout_scrollFlags="scroll|exitUntilCollapsed" />


            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar_layout"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="@color/green"
                android:stateListAnimator="@drawable/appbar_shadow"
                app:layout_collapseMode="pin"
                app:popupTheme="@style/AppTheme.PopupOverlay"
                app:theme="@style/ToolbarMenuItemsBackGroundTheme"
                tools:targetApi="lollipop">

                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">

                    <TextView
                        android:id="@+id/title_txt"
                        android:layout_width="wrap_content"
                        android:layout_height="match_parent"
                        android:layout_alignParentStart="true"
                        android:layout_toStartOf="@+id/star_img"
                        android:ellipsize="end"
                        android:fontFamily="sans-serif-medium"
                        android:gravity="center_vertical"
                        android:maxLines="1"
                        android:textColor="@color/colorPrimaryDark"
                        android:textSize="19sp" />

                    <ImageView
                        android:id="@+id/star_img"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignParentEnd="true"
                        android:layout_centerInParent="true"
                        android:layout_gravity="center"
                        android:layout_marginEnd="24dp"
                        android:padding="10dp"
                        android:src="@drawable/ic_favorite_filled" />

                </RelativeLayout>

            </android.support.v7.widget.Toolbar>



        <android.support.design.widget.TabLayout
            android:id="@+id/tab_layout"
            android:layout_width="wrap_content"
            android:layout_height="48dp"
            android:layout_marginLeft="16dp"
            android:layout_marginRight="16dp"
            android:background="#45b0b2"
            android:visibility="gone"
            app:tabBackground="@drawable/backgr_blue_transparent_selector"
            app:tabGravity="center"
            app:tabIndicatorColor="@color/colorPrimaryDark"
            app:tabIndicatorHeight="2dp"
            app:tabMinWidth="500dp"
            app:tabMode="fixed"
            app:tabSelectedTextColor="@color/colorPrimaryDark"
            app:tabTextAppearance="@style/CustomTabLayout"
            app:tabTextColor="@color/green" />
        </android.support.design.widget.CollapsingToolbarLayout>
    </android.support.design.widget.AppBarLayout>


    <FrameLayout
        android:id="@+id/fragment_content_holder"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/black"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    <android.support.v4.view.ViewPager
        android:id="@+id/view_pager_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>

Answer 2

只要单击选项卡，就可以通过调用scrollView.fullScroll(View.FOCUS_UP)在视图寻呼机的片段中滚动到顶部。如果您在viewpager中的片段向上滚动，那么您的滚动应该可以正常工作。

Answer 3

试试这个

  

活动布局

    <android.support.design.widget.CoordinatorLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fitsSystemWindows="true"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.design.widget.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:contentScrim="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            app:title=""
            app:titleEnabled="false">

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="256dp"
                android:scaleType="fitXY"
                android:src="@drawable/abc"
                app:layout_collapseMode="parallax" />

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="pin"
                app:popupTheme="@style/AppTheme.PopupOverlay" />
        </android.support.design.widget.CollapsingToolbarLayout>

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/colorPrimary"
            app:layout_anchor="@id/appBar"
            app:tabGravity="fill"
            app:tabTextColor="#FFFFFF"
            app:tabSelectedTextColor="#ff00"
            app:tabMode="scrollable"
            app:layout_anchorGravity="bottom" />

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

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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

活动代码

public class MainActivity extends AppCompatActivity {


    private Toolbar toolbar;
    private TabLayout tabLayout;
    private ViewPager viewPager;


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

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

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        viewPager = (ViewPager) findViewById(R.id.viewpager);
        setupViewPager(viewPager);

        tabLayout = (TabLayout) findViewById(R.id.tabs);
        tabLayout.setupWithViewPager(viewPager);


    }
    private void setupViewPager(ViewPager viewPager) {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        adapter.addFragment(new BlankFragment(), "TAB-ONE");
        adapter.addFragment(new BlankFragment(), "TAB-TWO");
        adapter.addFragment(new BlankFragment(), "TAB-THREE");
        viewPager.setAdapter(adapter);
    }




}

片段代码

public class BlankFragment extends Fragment {


    public BlankFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment



        return inflater.inflate(R.layout.fragment_blank, container, false);
    }

}

  

片段布局

<?xml version="1.0" encoding="utf-8"?>

<android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">


    <LinearLayout
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:context=".BlankFragment">

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="250dp"
            android:layout_margin="5dp"
            android:scaleType="centerCrop"
            android:src="@drawable/kid_goku" />

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="250dp"
            android:layout_margin="5dp"
            android:scaleType="centerCrop"
            android:src="@drawable/kid_goku" />

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="250dp"
            android:layout_margin="5dp"
            android:scaleType="centerCrop"
            android:src="@drawable/kid_goku" />

    </LinearLayout>
</android.support.v4.widget.NestedScrollView>

  

ViewPagerAdapter代码

public class ViewPagerAdapter extends FragmentPagerAdapter {
    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

    @Override
    public int getCount() {
        return mFragmentList.size();
    }

    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }

}

您可以在此处查看视频CollapsingToolbarLayout WITH TabLayout

您可以从此处CollapsingToolbarLayout WITH TabLayout

下载完整的项目

Answer 4

我花了很多时间用AppBar + Collapsing Layouts调查我的问题。而我所发现的是谷歌支持库中的一个错误。所以我为谷歌创建了这个问题，他们将其分配给开发人员之一：https://issuetracker.google.com/issues/78686882

但是为了解决这个问题，我现在做了一个解决方法 - 如果用户会因为滚动部分布局而陷入困境 - 他们可能会尝试点击我的TabLayout中的一个标签。所以我添加了代码以自动折叠，动画折叠部分布局：appBarLayout.setExpanded(false, true);

以下是代码：

tabLayout.addOnTabSelectedListener(new ViewPagerOnTabSelectedListener(viewPagerLayout) {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                appBarLayout.setExpanded(false, true);
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {
                //no ui effects
            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {
        appBarLayout.setExpanded(false, true);

            }
        });