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項目中需要用到A-Z的列表，點擊字母可以滾動到列表中對應字母位置。

先看下怎么使用：

xml中：

        android:id="@+id/siderbar_letters"        android:layout_width="match_parent"        android:layout_height="match_parent"        app:siderQuickItemTypebgColor="#3F88FF"        app:sliderLetterColor="#808080"        app:sliderLetterWidth="12sp"        app:siderQuickItemTypeTextWidth="14sp"        app:siderQuickItemTypeTextColor="#FFFFFF"/>

java中:

public class MainActivity extends AppCompatActivity {    private String[] str = new String[]{"一","二","三","死","一","一","一","一",            "商店","一","重新","我","as","第","是","把","留",            "阿薩德","as","都是","一","一","商店","商店","發(fā)","一",            "一","阿薩德","一","商店",};

    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        List list = new ArrayList<>();        for(int i=0;i            ItemBeans itemBeans = new ItemBeans();            itemBeans.setType(i+1);            itemBeans.setValues(str[i]);            list.add(itemBeans);        }
        SiderQuickBarView siderQuickBarView = findViewById(R.id.siderbar_letters);        siderQuickBarView.setLetters(list)                         .setOnItemClickListener(letterBean ->                        Toast.makeText(this,"type==>"+letterBean.getType()+"  value==>"+letterBean.getLetterName(),Toast.LENGTH_SHORT).show()                );    }}

自定義屬性：

只需要把任意文字轉(zhuǎn)成list ，按規(guī)則傳入，即可自動按字母排序，點擊后可返回當前字母和字母對應的key值。

效果圖：

下面說一下實現(xiàn)的思路：

????1.控件由兩部分構(gòu)成：下面的RecyclerView和右側(cè)的自定義字母，使用的是幀布局。
????2.將輸入的文字按字母分類。
? ? 3.將分類好的字母放入新的list中，字母和字母對應的文字用type進行區(qū)分。
????4.為RecyclerView創(chuàng)建適配器，添加點擊事件。
????5.為字母添加點擊事件，并使RecyclerView滑動。
????6.封裝自定義屬性。

好了，放一下主要代碼：

public class SiderQuickBarView extends FrameLayout {    private RecyclerView rvLetter;    private SliderLetterView sliderLetterView;    private GuideBbar guideBbar;    private Context context;    private List letterBeans;    private List cityBeans;
    //自定義屬性    private int siderQuickItemTypebgColor;    private int siderQuickItemTypeTvColor;    private float siderQuickItemTypeTextWidth;
    private int sliderLetterColor;    private int sliderLetterWidth;
    private OnItemClickListener onItemClickListener;
    public SiderQuickBarView(Context context) {        super(context);        initView(context);    }

    public SiderQuickBarView(Context context, AttributeSet attrs) {        super(context, attrs);        TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.SiderQuickBarView);        siderQuickItemTypebgColor = array.getColor(R.styleable.SiderQuickBarView_siderQuickItemTypebgColor, ContextCompat.getColor(context,R.color.colorAccent));        siderQuickItemTypeTvColor = array.getColor(R.styleable.SiderQuickBarView_siderQuickItemTypeTextColor,ContextCompat.getColor(context,R.color.whilte));        siderQuickItemTypeTextWidth = array.getDimensionPixelSize(R.styleable.SiderQuickBarView_siderQuickItemTypeTextWidth,20);
        sliderLetterColor = array.getColor(R.styleable.SiderQuickBarView_sliderLetterColor,ContextCompat.getColor(context,R.color.black));        sliderLetterWidth = array.getDimensionPixelSize(R.styleable.SiderQuickBarView_sliderLetterWidth,50);        initView(context);        array.recycle();    }
    private void initView(Context context) {        this.context = context;        //左邊列表        rvLetter = new RecyclerView(context);        rvLetter.setLayoutManager(new LinearLayoutManager(context));        LayoutParams layoutParams = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);        rvLetter.setLayoutParams(layoutParams);
        //右邊字母列表        sliderLetterView = new SliderLetterView(context,sliderLetterColor,sliderLetterWidth);        LayoutParams layoutParams1 = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);        layoutParams1.gravity = Gravity.END;        layoutParams1.bottomMargin = 10;        sliderLetterView.setLayoutParams(layoutParams1);
        //GuiBar        guideBbar = new GuideBbar(context);        FrameLayout.LayoutParams layoutParams2  = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);        layoutParams2.gravity = Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL;        layoutParams2.bottomMargin = 100;        guideBbar.setLayoutParams(layoutParams2);
        addView(rvLetter);        addView(sliderLetterView);//        addView(guideBbar);        //字母監(jiān)聽        setListener();    }
    private void setListener() {        sliderLetterView.setOnLetterTouchListener(letter -> {            for(int i=0;i                if(letter.equals(letterBeans.get(i).getLetterName())){                    moveToPosition(i);                    break;                }            }            Toast.makeText(context,letter,Toast.LENGTH_SHORT).show();        });
        rvLetter.addOnScrollListener(new RecyclerView.OnScrollListener() {            @Override            public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {                super.onScrolled(recyclerView, dx, dy);                double scrollY = recyclerView.computeVerticalScrollOffset();                double s = recyclerView.computeVerticalScrollExtent();                double sum = recyclerView.computeVerticalScrollRange()-s;                double f = scrollY/sum;                guideBbar.setGuideX(f);            }        });
    }
    private void moveToPosition(int position) {        if (position != -1) {            rvLetter.scrollToPosition(position);            LinearLayoutManager mLayoutManager =                    (LinearLayoutManager) rvLetter.getLayoutManager();            assert mLayoutManager != null;            mLayoutManager.scrollToPositionWithOffset(position, 0);        }    }
    public SiderQuickBarView setLetters(List letters){        Map> letterMap = letters.stream().collect(Collectors.groupingBy(letter -> PinYinUtils.getFirstLetter(letter.getValues())));        Iterator>> itLetter = letterMap.entrySet().iterator();        cityBeans = new ArrayList<>();        letterBeans = new ArrayList<>();        Iterator keySet = letterMap.keySet().iterator();        while (keySet.hasNext()){            CityBean cityBean = new CityBean();            cityBean.setKey(keySet.next());            cityBeans.add(cityBean);        }        //對字母排序        SiderComparator siderComparator = new SiderComparator();        Collections.sort(cityBeans,siderComparator);
        cityBeans.forEach(cityBean -> {            List contentList = new ArrayList();            List itemBeans = letterMap.get(cityBean.getKey());            LetterBean letterBean = new LetterBean();            letterBean.setLetterType(LetterType.title);            letterBean.setLetterName(cityBean.getKey());            contentList.add(letterBean);            itemBeans.forEach(item -> {                LetterBean letterBean1 = new LetterBean();                letterBean1.setLetterType(LetterType.contet);                letterBean1.setType(item.getType());                letterBean1.setLetterName(item.getValues());                contentList.add(letterBean1);            });            cityBean.setBeanList(contentList);        });
        cityBeans.forEach(cityBean -> {            letterBeans.addAll(cityBean.getBeanList());        });        LetterListAdapter letterListAdapter = new LetterListAdapter(context, letterBeans, siderQuickItemTypeTvColor, siderQuickItemTypebgColor, siderQuickItemTypeTextWidth);        rvLetter.setAdapter(letterListAdapter);        letterListAdapter.setOnItemClickListener((adapter, position) -> {            LetterListAdapter la = (LetterListAdapter) adapter;            LetterBean item = la.getItem(position);            if(onItemClickListener != null){                onItemClickListener.onClick(item);            }
        });        return this;    }
    interface OnItemClickListener{        void onClick(LetterBean letterBean);    }
    public SiderQuickBarView setOnItemClickListener(OnItemClickListener onItemClickListener){        this.onItemClickListener = onItemClickListener;        return  this;    }

    class SiderComparator implements Comparator {
        @Override        public int compare(CityBean cityBean1, CityBean cityBean2) {            return cityBean1.getKey().compareTo(cityBean2.getKey());        }    }

    @Retention(RetentionPolicy.SOURCE)    @IntDef({LetterType.title,LetterType.contet})    public @interface LetterType{        int title = 0;        int contet = 1;    }}

這個就是整個控件了，繼承自FrameLayout，包含一個RecyclerView和右邊的自定義字母(忽略被注釋的View)

這里最主要的就是將輸入的字符串信息，按照字母分類，我這里用到了一個第三庫：

 implementation 'com.belerweb:pinyin4j:2.5.1'

外加這個庫的一個工具類：

public class PinYinUtils {    /**     * 將字符串中的中文轉(zhuǎn)化為拼音,其他字符不變     *     * @param inputString     * @return     */    public static String getPingYin(String inputString) {        HanyuPinyinOutputFormat format = new HanyuPinyinOutputFormat();        format.setCaseType(HanyuPinyinCaseType.LOWERCASE);        format.setToneType(HanyuPinyinToneType.WITHOUT_TONE);        format.setVCharType(HanyuPinyinVCharType.WITH_V);
        char[] input = inputString.trim().toCharArray();        String output = "";        try {            for (int i = 0; i < input.length; i++) {                if (java.lang.Character.toString(input[i]).matches("[\\u4E00-\\u9FA5]+")) {                    String[] temp = PinyinHelper.toHanyuPinyinStringArray(input[i], format);                    output += temp[0];                } else {                    output += java.lang.Character.toString(input[i]);                }            }        } catch (BadHanyuPinyinOutputFormatCombination e) {            e.printStackTrace();        }        return output;    }    /**     * 獲取漢字串拼音首字母，英文字符不變     * @param chinese 漢字串     * @return 漢語拼音首字母     */    public static String getFirstSpell(String chinese) {        StringBuffer pybf = new StringBuffer();        char[] arr = chinese.toCharArray();        HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat();        defaultFormat.setCaseType(HanyuPinyinCaseType.LOWERCASE);        defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);        for (int i = 0; i < arr.length; i++) {            if (arr[i] > 128) {                try {                    String[] temp = PinyinHelper.toHanyuPinyinStringArray(arr[i], defaultFormat);                    if (temp != null) {                        pybf.append(temp[0].charAt(0));                    }                } catch (BadHanyuPinyinOutputFormatCombination e) {                    e.printStackTrace();                }            } else {                pybf.append(arr[i]);            }        }        return pybf.toString().replaceAll("\\W", "").trim();    }    /**     * 獲取漢字串拼音，英文字符不變     * @param chinese 漢字串     * @return 漢語拼音     */    public static String getFullSpell(String chinese) {        StringBuffer pybf = new StringBuffer();        char[] arr = chinese.toCharArray();        HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat();        defaultFormat.setCaseType(HanyuPinyinCaseType.LOWERCASE);        defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);        for (int i = 0; i < arr.length; i++) {            if (arr[i] > 128) {                try {                    pybf.append(PinyinHelper.toHanyuPinyinStringArray(arr[i], defaultFormat)[0]);                } catch (BadHanyuPinyinOutputFormatCombination e) {                    e.printStackTrace();                }            } else {                pybf.append(arr[i]);            }        }        return pybf.toString();    }
    /** 獲取首字母     * @param letter     * @return     */    public static String getFirstLetter(String letter){        StringBuffer pybf = new StringBuffer();        char[] arr = letter.toCharArray();        HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat();        defaultFormat.setCaseType(HanyuPinyinCaseType.LOWERCASE);        defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);        for (int i = 0; i < arr.length; i++) {            if (arr[i] > 128) {                try {                    pybf.append(PinyinHelper.toHanyuPinyinStringArray(arr[i], defaultFormat)[0]);                } catch (BadHanyuPinyinOutputFormatCombination e) {                    e.printStackTrace();                }            } else {                pybf.append(arr[i]);            }        }        return pybf.substring(0,1);    }}

這個工具類的作用，可以將文字的首字母給取出來，那么取出來干嘛呢？？
下面我正好借助lamda表達式，根據(jù)首字母將數(shù)據(jù)進行分組：

Map> letterMap = letters.stream().collect(Collectors.groupingBy(letter -> PinYinUtils.getFirstLetter(letter.getValues())));

分完組之后的數(shù)據(jù)就是一個map集合 map的key就是各數(shù)據(jù)對應的首字母，value就是各首字母對應的數(shù)據(jù)，再將map中的數(shù)據(jù)，放入一個新的list中，所以現(xiàn)在混亂數(shù)據(jù)就變成了一組組有序集合了，但現(xiàn)在還不夠，因為是按照A-Z排序，目前不是按A-Z，可能是g，f，a，d 這樣亂排序的，只是把數(shù)據(jù)都放在了它們各自的首字母下面而已，那么，下面就借助Comparator這個接口讓字母按照A-Z的順序排序：

class SiderComparator implements Comparator {
        @Override        public int compare(CityBean cityBean1, CityBean cityBean2) {            return cityBean1.getKey().compareTo(cityBean2.getKey());        }    }
        //對字母排序        SiderComparator siderComparator = new SiderComparator();        Collections.sort(cityBeans,siderComparator);

排序完成之后，這個list就可以像普通的list一樣放入RecyclerView的適配器中使用了。

下面看一下自定義的字母：

/** * 右邊字母自定義 * @author amggy */public class SliderLetterView extends View {    private Paint paint;    private String[] letters;    private double itemHeight;    private int position;    private OnLetterTouchListener onLetterTouchListener;
    private int paintColor;    private int paintStrokWith;
    public SliderLetterView(Context context,int paintColor,int paintStrokWith) {        super(context);        this.paintColor = paintColor;        this.paintStrokWith = paintStrokWith;        initView(context);    }
    public SliderLetterView(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        initView(context);
    }
    public SliderLetterView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        initView(context);    }
    private void initView(Context context) {        letters = new String[]{"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"};        position = 0;        paint = new Paint();        paint.setAntiAlias(true);        paint.setDither(true);        paint.setColor(paintColor);        paint.setTextSize(paintStrokWith);        paint.setTextAlign(Paint.Align.CENTER);    }
    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        double screenHeight = getHeight();        itemHeight = screenHeight /letters.length;        float letterX = (float)getWidth()/2;        for(int i=0;i            canvas.drawText(letters[i],letterX,(float) ((i+1)*itemHeight),paint);        }    }
    @SuppressLint("ClickableViewAccessibility")    @Override    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction()){            case MotionEvent.ACTION_DOWN:                float eventY = event.getY();                position = (int) (eventY/itemHeight);                if(onLetterTouchListener != null){                    onLetterTouchListener.onTouch(letters[position]);                }                break;            case MotionEvent.ACTION_MOVE:                break;            case MotionEvent.ACTION_UP:                break;            default:                break;        }        return true;    }
    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        int with = MeasureSpec.getSize(widthMeasureSpec);        int withMode = MeasureSpec.getMode(widthMeasureSpec);
        int high = MeasureSpec.getSize(heightMeasureSpec);        int highMode = MeasureSpec.getMode(heightMeasureSpec);
        int w = 0;        int h = 0;
        switch(withMode){            case MeasureSpec.EXACTLY:                w = with;                break;            case MeasureSpec.AT_MOST:                w = 80;                break;            default:                break;        }
        switch(highMode){            case MeasureSpec.EXACTLY:                h = high;                break;            case MeasureSpec.AT_MOST:                h = getMeasuredHeight();                break;            default:                break;        }        setMeasuredDimension(w,h);    }

    public void setOnLetterTouchListener(OnLetterTouchListener onLetterTouchListener){        this.onLetterTouchListener = onLetterTouchListener;    }
    public interface OnLetterTouchListener{        /** 返回選中字母         * @param letter 字母         */        void onTouch(String letter);    }}

自定義字母繼承自View，按照控件的高度，等分的繪制字母，添加onTouch事件，將觸碰到的字母返回出去，給RecyclerView滾動到指定位置做準備。

Android自定義實現(xiàn)A-Z列表功能