带有折叠工具栏的 RecyclerView 中的 Android 字母快速 ScrollView

Question

在我的应用程序中，我有这样的 activity_main.xml:-

<Coordinator Layout>
   <AppBarLayout>
      <CollapsingToolbarLayout>
           <ImageView/>
           <Toolbar/>
       </CollapsingToolbarLayout>
   </AppBarLayout>
   <RecyclerView/>
</Coordinating Layout>

Layout.xml ----->>>

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



<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/theme_background"
    android:id="@+id/drawerlayout"
    >


    <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:id="@+id/activity_main_id"
        tools:context="objectdistance.ajai.ram.sita.gallery.MainActivity">

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


            <android.support.design.widget.CollapsingToolbarLayout
                android:id="@+id/collapsing_toolbar"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:layout_scrollFlags="scroll|exitUntilCollapsed"
                app:contentScrim="?attr/colorPrimary"
                app:expandedTitleMarginStart="48dp"
                app:expandedTitleMarginEnd="64dp"
                android:fitsSystemWindows="true">



                <ImageView
                    android:id="@+id/imagetoolbar"
                    android:layout_width="match_parent"
                    android:layout_height="200dp"
                    android:scaleType="centerCrop"
                    android:fitsSystemWindows="true"
                    android:foreground="@drawable/image_header_foreground"
                    app:layout_scrollFlags="scroll"
                    app:layout_collapseMode="parallax"/>

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

                    <Spinner
                        android:id="@+id/spinner_nav"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"

                        android:dropDownVerticalOffset="?attr/actionBarSize" />

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

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


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




        <android.support.v7.widget.RecyclerView
            android:id="@+id/list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />




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


    <ListView
        android:layout_width="200dp"
        android:layout_height="match_parent"
        android:id="@+id/navlist"
        android:background="#dedede"
        android:layout_gravity="start" />

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

现在我想在我的回收站 View 中加入快速滚动功能，以便在滚动时弹出图像日期。

此类滚动条的示例图像:-

我搜索了这个并尝试使用几个库，但我认为由于我的折叠工具栏，滚动条无法正常工作。

使用的滚动库的屏幕截图:-

在我的例子中，滚动条是从顶部开始的，滚动计算也不正确。

请帮忙解决这个问题。

谢谢

Answer 1

我们想要SectionIndexer的一些知识。这里是 Doc SectionIndexer。

我们必须设置 TRUE setFastScrollEnabled(true) 方法，该方法与 LISTVIEW 一起使用。 .....您可以在下面的示例中使用 recyclerview 而不是 listView ....

这是 Activity

public class FastScoll extends ListActivity {

    ListView fruitView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fast_scoll);

        fruitView = (ListView) findViewById(android.R.id.list);

        fruitView.setFastScrollEnabled(true);
        String[] fruits = getResources().getStringArray(R.array.fruits_array);

        final List<String> fruitList = Arrays.asList(fruits);
        Collections.sort(fruitList);
        setListAdapter(new ListAdapter(this, fruitList));

        fruitView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            public void onItemClick(AdapterView<?> parent, View arg1,
                                    int position, long arg3) {
                Log.e("sushildlh",fruitList.get(position));
            }
        });

    }
}

这是 activity_fast_scoll.xml 文件

<RelativeLayout 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"
    android:padding="5dp" >

    <ListView
        android:id="@android:id/list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:scrollbarStyle="outsideOverlay" />

</RelativeLayout>

这是我的自定义适配器，带有 SectionIndexer....

public class ListAdapter extends ArrayAdapter<String> implements SectionIndexer {

    String[] sections;
    List<String> fruits;
    List<String> sectionLetters=new ArrayList<String>();

    public ListAdapter(Context context, List<String> fruitList) {
        super(context, android.R.layout.simple_list_item_1, fruitList);
        this.fruits = fruitList;

        for (int x = 0; x < fruits.size(); x++) {
            String fruit = fruits.get(x);
            String ch = fruit.charAt(0)+"";
            ch = ch.toUpperCase(Locale.US);

            sectionLetters.add(ch);
        }

        ArrayList<String> sectionList = new ArrayList<String>(sectionLetters);

        sections = new String[sectionList.size()];

        sectionList.toArray(sections);
    }

    public int getPositionForSection(int section) {

        Log.e("sushildlh", "" + section);
        return section;
    }

    public int getSectionForPosition(int position) {

        Log.d("sushildlh", "" + position);
        return position;
    }

    public Object[] getSections() {
        return sections;
    }
}

这是 string.xml 文件中的水果数组。

 <string-array name="fruits_array">
            <item>Apples</item>
            <item>Apricots</item>
            <item>Avocado</item>
            <item>Annona</item>
            <item>Banana</item>
            <item>Bilberry</item>
            <item>Blackberry</item>
            <item>Custard Apple</item>
            <item>Clementine</item>
            <item>Cantalope</item>
            <item>Coconut</item>
            <item>Currant</item>
            <item>Cherry</item>
            <item>Cherimoya</item>
            <item>Date</item>
            <item>Damson</item>
            <item>Durian</item>
            <item>Elderberry</item>
            <item>Fig</item>
            <item>Feijoa</item>
            <item>Grapefruit</item>
            <item>Grape</item>
            <item>Gooseberry</item>
            <item>Guava</item>
            <item>Honeydew melon</item>
            <item>Huckleberry</item>
            <item>Jackfruit</item>
            <item>Juniper Berry</item>
            <item>Jambul</item>
            <item>Jujube</item>
            <item>Kiwi</item>
            <item>Kumquat</item>
            <item>Lemons</item>
            <item>Limes</item>
            <item>Lychee</item>
            <item>Mango</item>
            <item>Mandarin</item>
            <item>Mangostine</item>
            <item>Nectaraine</item>
            <item>Orange</item>
            <item>Olive</item>
            <item>Prunes</item>
            <item>Pears</item>
            <item>Plum</item>
            <item>Pineapple</item>
            <item>Peach</item>
            <item>Papaya</item>
            <item>Passionfruit</item>
            <item>Pomegranate</item>
            <item>Pomelo</item>
            <item>Raspberries</item>
            <item>Rock melon</item>
            <item>Rambutan</item>
            <item>Strawberries</item>
            <item>Sweety</item>
            <item>Salmonberry</item>
            <item>Satsuma</item>
            <item>Tangerines</item>
            <item>Tomato</item>
            <item>Ugli</item>
            <item>Watermelon</item>
            <item>Woodapple</item>
        </string-array>

最后这是这些代码的输出......

随时询问您是否卡在代码之间的任何地方......

注意:- FastScroll 图像在不同版本的 android(例如:-lollipop、marshmallow 等)中会有所不同，以下输出适用于 Lollipop

对于 Custom Alphabetical Fast scrollView，只需在 AppTheme 的 style.xml 文件中添加这两行。

<item name="android:fastScrollTextColor">@color/apptheme_color</item>         //this is used for the color of the Alphabetical Fast scrollView
<item name="android:fastScrollPreviewBackgroundRight">@drawable/bg_default_focused_holo_light</item>          //this is the image or and drawable file you want to set on Alphabetical Fast scrollView

自定义快速滚动输出:-