ListView增强组件QuickScroll

QuickScroll使用步骤

国际惯例，先看代码。

public class Main2Activity extends AppCompatActivity {    private ArrayList<String> mDatas;    private ListView mListView;    private MyAdapter mMyAdapter;    private static final int CORAL = Color.parseColor("#f0f76541");    private static final int CORAL_DARK = Color.parseColor("#e0e55b3c");    private static final int CORAL_HANDLE = Color.parseColor("#80f76541");    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main2);        initData();        mListView = (ListView) findViewById(R.id.lv);        mMyAdapter = new MyAdapter(mDatas, this);        mListView.setAdapter(mMyAdapter);        QuickScroll quickscroll = (QuickScroll) findViewById(R.id.quickscroll);        assert quickscroll!=null;        //样式一 跟随式        quickscroll.init(QuickScroll.TYPE_INDICATOR_WITH_HANDLE, mListView, mMyAdapter, QuickScroll.STYLE_HOLO);        quickscroll.setIndicatorColor(CORAL, CORAL_DARK, Color.WHITE);        quickscroll.setHandlebarColor(CORAL, CORAL, CORAL_HANDLE);//        quickscroll.setFixedSize(1);//        quickscroll.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 48);        //样式二 弹出式//        quickscroll.init(QuickScroll.TYPE_POPUP, mListView, mMyAdapter, QuickScroll.STYLE_NONE);//        quickscroll.setFixedSize(2);//        quickscroll.setPopupColor(QuickScroll.BLUE_LIGHT, QuickScroll.BLUE_LIGHT_SEMITRANSPARENT, 1, Color.WHITE, 1);    }    private void initData() {        mDatas = new ArrayList<>();        for (int i = 0; i < 100; i++) {            mDatas.add(i + " - ANDROID");        }    }}============华丽的分割线，下面是Adapter=============public class MyAdapter extends BaseAdapter implements Scrollable {    private ArrayList<String> mDatas;    private Context mContext;    public MyAdapter(ArrayList<String> datas, Context context) {        mDatas = datas;        mContext = context;    }//基本方法...老三样，忽略之    @Override    public View getView(int position, View convertView, ViewGroup parent) {        if (convertView == null) {            convertView = LayoutInflater.from(mContext).inflate(android.R.layout.simple_list_item_1, null);        }        ((TextView) convertView.findViewById(android.R.id.text1)).setText(mDatas.get(position));        return convertView;    }    /**     * 滑动时返回的预览文字(索引)     *     * @param childposition     *            equals childposition if used with ExpandableListView, position otherwise.     * @param groupposition     * @return     */    @Override    public String getIndicatorForPosition(int childposition, int groupposition) {        Log.i(TAG, "getIndicatorForPosition: childposition = "+childposition);//        Log.i(TAG, "getIndicatorForPosition: groupposition = "+groupposition);        return mDatas.get(childposition);    }    /**     * 重写该方法，响应滑动时的事件，是否跟随、定位到当前item     * @param childposition     *            equals childposition if used with ExpandableListView, position otherwise.     * @param groupposition     * @return     */    @Override    public int getScrollPosition(int childposition, int groupposition) {        return childposition;    }    public static final String TAG = MyAdapter.class.getSimpleName();}

布局文件，有些坑，照搬了sample

<?xml version="1.0" encoding="utf-8"?><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"    tools:context="com.vincyan.a1010_jni2.Main2Activity">    <ListView        android:id="@+id/lv"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:divider="#000000"        android:layout_toStartOf="@+id/quickscroll"        android:dividerHeight="1px"        android:drawSelectorOnTop="false"        android:overScrollMode="never"        android:scrollbars="none"/>    <com.andraskindler.quickscroll.QuickScroll        android:id="@+id/quickscroll"        android:layout_alignTop="@id/lv"        android:layout_alignBaseline="@id/lv"        android:layout_alignParentEnd="true"        android:layout_width="wrap_content"        android:layout_height="match_parent"/></RelativeLayout>

步骤

使用QuickScroll，直接将源码复制到项目的目录下，app/src/main/java/com/…

1、定义Adapter，实现Scrollable接口，重写下面的两个方法（必须）

1-1 getIndicatorForPosition
返回当前位置的指示器，就是滑动时的预览文字
1-2 getScrollPosition
同步ListView的滑动，滚动到指定的item

2、布局文件中引入QuickScroll组件

com.andraskindler.quickscroll.QuickScroll

3、将QuickScroll跟ListView关联，配置相关属性；

quickscroll.init(QuickScroll.TYPE_INDICATOR_WITH_HANDLE, mListView, mMyAdapter, QuickScroll.STYLE_HOLO);        quickscroll.setIndicatorColor(CORAL, CORAL_DARK, Color.WHITE);        quickscroll.setHandlebarColor(CORAL, CORAL, CORAL_HANDLE);