Hiding/Showing标签中的片段滚动时的工具栏

Question

我在我的 android 应用程序中添加了新的 Toolbar、Tablayout 和 Viewpager。我为我的 3 个选项卡提供了 Fragments，它工作正常。但问题是，当我向上滚动时，我的工具栏不会隐藏。我希望当我滚动我的片段时它应该隐藏。还有一件事，我在片段中使用了 Webview。我的代码如下。

MainActivity.Java

public class MainActivity extends AppCompatActivity {
    TabLayout tabLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

        setupToolbar();
        setupTablayout();
    }

private void setupToolbar() {
    // TODO Auto-generated method stub
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbarsdfs);
    if (toolbar != null) {
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);}
}

private void setupTablayout() {
    // TODO Auto-generated method stub
    tabLayout = (TabLayout) findViewById(R.id.tabLayout);
    tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
    tabLayout.addTab(tabLayout.newTab().setText("Tab 1"));
    tabLayout.addTab(tabLayout.newTab().setText("Tab 2"));
    final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
    final PagerAdapter adapter = new PagerAdapter
            (getSupportFragmentManager(), tabLayout.getTabCount());
    viewPager.setAdapter(adapter);
    viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
    tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            viewPager.setCurrentItem(tab.getPosition());
        }

        @Override
        public void onTabUnselected(TabLayout.Tab tab) {

        }

        @Override
        public void onTabReselected(TabLayout.Tab tab) {

        }
    });
}
}

main.xml

<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/coordinatorLayout"
    android:layout_height="match_parent"
    android:layout_width="match_parent">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbarsdfs"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:minHeight="?attr/actionBarSize"
    android:background="?attr/colorPrimaryDark"
    android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
    app:layout_scrollFlags="scroll|enterAlways"/>

<android.support.design.widget.TabLayout
            android:id="@+id/tabLayout"
            android:scrollbars="horizontal"
            android:layout_below="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?attr/colorPrimary" />

<android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="fill_parent"
        android:layout_below="@+id/tablayout"/>

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

PagerAdapter.Java

public class PagerAdapter extends FragmentStatePagerAdapter {
    int mNumOfTabs;

    public PagerAdapter(FragmentManager fm, int NumOfTabs) {
        super(fm);
        this.mNumOfTabs = NumOfTabs;
    }

    @Override
    public Fragment getItem(int position) {

        switch (position) {
            case 0:
                Fragment_Feeds tab1 = new Fragment_Feeds();
                return tab1;
            case 1:
                Fragment_Facts tab2 = new Fragment_Facts();
                return tab2;
            default:
                return null;
        }
    }

    @Override
    public int getCount() {
        return mNumOfTabs;
    }
}

Fragment_Feeds.java

public class Fragment_Feeds extends Fragment {
    SwipeRefreshLayout swipeView;
    WebView myWebView;
    ProgressBar progressBar;
    final static String myBlogAddr = "http://myblog.com";
    String myUrl;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragmentfeeds, container, false);
        swipeView = (SwipeRefreshLayout) view.findViewById(R.id.swipe);

        myWebView = (WebView) view.findViewById(R.id.webview);
        progressBar = (ProgressBar) view.findViewById(R.id.progressBar);
        myWebView.setWebViewClient(new MyWebViewClient()); 
        WebSettings webSettings = myWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        myWebView.setOverScrollMode(View.OVER_SCROLL_NEVER);
        myWebView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
        myWebView.setHorizontalScrollBarEnabled(false);
        myWebView.loadUrl("http://myblog.com");
        swipeView.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener()    
        {
            @Override
            public void onRefresh() 
            {
                  myWebView.loadUrl("http://myblog.com");

            }});
        return view;
    }
    private class MyWebViewClient extends WebViewClient {
        @Override
        public void onPageFinished(WebView view, String url) {
            swipeView.setRefreshing(false);
        }
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
         myUrl = url;
            view.loadUrl(url);
            return true;
        }
        @Override
        public void onReceivedError(WebView view, int errorCod,String description, String failingUrl) {
            myWebView.loadUrl("file:///android_asset/error_page.html");
        }
    }
    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.main, menu);
        super.onCreateOptionsMenu(menu, inflater);
    }
}

fragmentfeeds.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#FFFFFF" >
    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <android.support.v4.widget.SwipeRefreshLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/swipe"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:background="#FFFFFF">s

    <WebView
      android:id="@+id/webview"
      android:layout_width="match_parent"
      android:layout_height="fill_parent"
      android:numColumns="1"
      android:scrollbars="none"
      android:focusableInTouchMode="false"
      android:focusable="false"
      android:background="#FFFFFF" />
   </android.support.v4.widget.SwipeRefreshLayout>

</LinearLayout>

我想要什么？

我想要的是，当我向上滚动 webview 时，工具栏也应该向上滚动并隐藏，当我向下滚动时，工具栏应该尽快返回。

Answer 1

首先，您应该将 webview 移至 NestedScrollView 并将 'android:isScrollContainer' 属性设置为 'false' 值。 https://developer.android.com/reference/android/support/v4/widget/NestedScrollView.html

其次，您应该将 ViewPager 移到 AppBarLayout 之外。所以，你的 main.xml 应该是这样的：

<?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/main_content"
android:background="#FFF"
android:clickable="true"
android:layout_width="match_parent"
android:layout_height="match_parent">

<android.support.design.widget.AppBarLayout
    android:id="@+id/appbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

    <!-- your app bar stuff here -->
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="240dp"
        app:layout_scrollFlags="scroll|enterAlways">

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="fitXY"
            android:id="@+id/image_header"/>

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

    </FrameLayout>

    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:background="#FFF"
        app:tabTextColor="#a3a3a3"
        app:tabSelectedTextColor="#a3a3a3"
        app:tabIndicatorColor="#0042ab"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />

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

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

AppBarLayout childern 只有在有标志时才会隐藏 app:layout_scrollFlags

在此处阅读有关实施支撑设计库的更多信息：
https://android-developers.googleblog.com/2015/05/android-design-support-library.html

Answer 2

您应该将 ViewPager 移到 AppBarLayout 之外并向 ViewPager 添加行为 app:layout_behavior="@string/appbar_scrolling_view_behavior"

我写了一个完整的例子！ https://github.com/erikcaffrey/AndroidDesignSupportLibrary

希望对您有所帮助！

Answer 3

看看

How to properly hide&show the actionbar using the new design library API?
Android-ObservableScrollView

Answer 4

试试这个。

main.xml

<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/coordinatorLayout"
    android:layout_height="match_parent"
    android:layout_width="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.support.v7.widget.Toolbar
            android:id="@+id/toolbarsdfs"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|enterAlways"/>

        <android.support.design.widget.TabLayout
            android:id="@+id/tabLayout"
            android:scrollbars="horizontal"
            android:layout_below="@+id/toolbarsdfs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?attr/colorPrimary"
            app:tabTextColor="@android:color/white"
            app:tabSelectedTextColor="@android:color/white"
            app:tabIndicatorColor="@android:color/white"
            app:tabIndicatorHeight="3dp" />

    </android.support.design.widget.AppBarLayout>
    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="fill_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:layout_below="@+id/tablayout"/>
    </android.support.design.widget.CoordinatorLayout>

fragmentfeeds.xml

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.v4.widget.NestedScrollView
            xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:app="http://schemas.android.com/apk/res-auto"
            android:isScrollContainer="false"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="fill_vertical"
            android:clipToPadding="false"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">

    <ProgressBar
            android:id="@+id/progressBar"
            style="?android:attr/progressBarStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <android.support.v4.widget.SwipeRefreshLayout
          xmlns:android="http://schemas.android.com/apk/res/android"
          android:id="@+id/swipe"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:background="#FFFFFF">     

    <WebView
             android:id="@+id/webviewtool"
             android:layout_width="match_parent"
             android:layout_height="fill_parent"
             android:numColumns="1"
             android:focusableInTouchMode="false"
             android:focusable="false"
             android:background="#FFFFFF" />
</android.support.v4.widget.SwipeRefreshLayout>
             </LinearLayout>
    </android.support.v4.widget.NestedScrollView>

Answer 5

对不起我的英语。

我将向您展示我是如何为我的应用制作它的（最小 sdk：14，目标 sdk：22）。我不使用片段，我的 activity 中只有一个 webview，但处理程序是相同的。问题是当你在 webview 中滚动时，Android 不像滚动事件那样处理它，webview 处理他自己的事件。

首先我在 res 文件夹中定义 styles.xml。我使用透明和叠加的 ActionBar，当你想隐藏和显示时更好：

res/styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="@android:style/Theme.Holo">
        <!-- Customize your theme here. -->
        <item name="android:windowActionBarOverlay">true</item>
        <item name="android:actionBarStyle">@style/MyActionBar</item>

    </style>

    <!-- ACTION BAR STYLES -->
    <style name="MyActionBar" parent="@android:style/Widget.Holo.ActionBar">
        <item name="android:background">@color/actionbar_background</item>

    </style>

</resources>

然后在清单中，我在应用程序部分定义了应用程序和 ActionBar 的样式：

<application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>

最后在MainActivity中，必须在webview中控制手势。您必须实施 View.OnTouchListener 和 Handler.Callback。当你在webview上触摸时，你必须比较开始事件和结束事件：

MainActivity.Java

public class MainActivity extends Activity implements View.OnTouchListener, Handler.Callback {

    private float x1,x2,y1,y2; //x1, y1 is the start of the event, x2, y2 is the end.
    static final int MIN_DISTANCE = 150; //min distance for a scroll up event

    private static final int CLICK_ON_WEBVIEW = 1;
    private static final int CLICK_ON_URL = 2;
    private static final int UP_ON_WEBVIEW = 3;


    private final Handler handler = new Handler(this);

    public WebView webView;
    private WebViewClient client;
    private WebAppInterface webAppInt = new WebAppInterface(this);


    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        webView = (WebView)findViewById(R.id.myWebView);
        webView.setOnTouchListener(this);

        client = new WebViewClient();
        webView.setWebViewClient(client);        
        webView.loadDataWithBaseURL("file:///android_asset/", "myweb.html", "text/html", "UTF-8", "");

    }

//HERE START THE IMPORTANT PART
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (v.getId() == R.id.myWebView && event.getAction() == MotionEvent.ACTION_DOWN){
            x1 = event.getX();
            y1 = event.getY();
            handler.sendEmptyMessageDelayed(CLICK_ON_WEBVIEW, 200);
        } else if (v.getId() == R.id.myWebView && event.getAction() == MotionEvent.ACTION_UP){
            x2 = event.getX();
            y2 = event.getY();

            handler.sendEmptyMessageDelayed(UP_ON_WEBVIEW, 200);
        }

        return false;
    }

    @Override
    public boolean handleMessage(Message msg) {
        if (msg.what == CLICK_ON_URL){ //if you clic a link in the webview, thats not a scroll
            handler.removeMessages(CLICK_ON_WEBVIEW);
            handler.removeMessages(UP_ON_WEBVIEW);
            return true;
        }
        if (msg.what == CLICK_ON_WEBVIEW){

            Toast.makeText(this, "WebView clicked", Toast.LENGTH_SHORT).show();
            return true;
        }
        if (msg.what == UP_ON_WEBVIEW){
            float deltaX = x2 - x1; //horizontal move distance
            float deltaY = y2 - y1; //vertical move distance
            if ((Math.abs(deltaX) > MIN_DISTANCE) && (Math.abs(deltaX) > Math.abs(deltaY)))
            {
                // Left to Right swipe action
                if (x2 > x1)
                {
                    Toast.makeText(this, "Left to Right swipe [Next]", Toast.LENGTH_SHORT).show ();
                }

                // Right to left swipe action
                else
                {
                    Toast.makeText(this, "Right to Left swipe [Previous]", Toast.LENGTH_SHORT).show ();
                }

            }
            else if ((Math.abs(deltaY) > MIN_DISTANCE) && (Math.abs(deltaY) > Math.abs(deltaX)))
            {
                // Top to Bottom swipe action -- i SWOW MY ACTIONBAR ON SCROLLDOWN
                if (y2 > y1)
                {
                    getActionBar().show();
                    Toast.makeText(this, "Top to Bottom swipe [Show Bar]", Toast.LENGTH_SHORT).show ();
                }

                // Bottom to top swipe action -- I HIDE MY ACTIONBAR ON SCROLLUP
                else
                {
                    getActionBar().hide();
                    Toast.makeText(this, "Bottom to Top swipe [Hide Bar]", Toast.LENGTH_SHORT).show ();
                }
            }
            return true;
        }
        return false;
    }
}

希望对你有帮助。

Answer 6

隐藏特定片段的菜单：

       setHasOptionsMenu(true); //Inside of onCreate in FRAGMENT:  


   @Override
   public void onPrepareOptionsMenu(Menu menu) {
       menu.findItem(R.id.action_search).setVisible(false);
   }

Answer 7

只需在您的工具栏或 FAB 按钮中添加这一行。

app:layout_scrollFlags="scroll|enterAlways"

app:layout_scrollFlags="scroll|enterAlways" 行将导致我们的 Toolbar 将在用户向下滚动列表时滚动屏幕，一旦他开始向上滚动，Toolbar 将再次出现.简洁明了，这就是 CoordinatorLayout 的力量！

请看一下这个link https://mzgreen.github.io/2015/06/23/How-to-hideshow-Toolbar-when-list-is-scrolling(part3)/&re=1&ts=1453224208&sig=ALL1Aj5aKrtAlylt-Qt3Ci6uwff76BqQYw

Answer 8

只需将 app:layout_scrollFlags="scroll|enterAlways" 放入您的工具栏即可。

Hiding/Showing标签中的片段滚动时的工具栏

Hiding/Showing the toolbar when fragment in the tabs is scrolled

android

android-fragments

webview

toolbar

android-tablayout