專案要求，聯絡人頁面，怎樣才能好看一點呢？ 又不要用ListView，又要帶懸浮的標。來吧，說一下聯絡人的點

首先有個SideBarView 就是側邊字母欄，這個東西呢 關於自定義view ,我了兩個SideBarView 

兩種不同風格的SideBarView Tisp;

先貼程式碼吧

第一種

public class SildeBar extends View {

    public static final String TAG = "SlideBar";
// 觸控事件
private OnTouchingLetterChangedListener onTouchingLetterChangedListener
 
;
// 26個字母
public static String[] b = { "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", "#" };
    private int choose = -1;// 選中
private Paint paint = new Paint();
    private TextView mTextDialog;
    private float singleHeight
 
;
    public static int dialogColor[] = { R.drawable.dialog_color_blue, R.drawable.dialog_color_green,
R.drawable.dialog_color_orange, R.drawable.dialog_color_purple, R.drawable.dialog_color_red };;
    public void setTextView(TextView mTextDialog) {
        this.mTextDialog = mTextDialog;
}

    public 
 
SildeBar(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
}

    public SildeBar(Context context, AttributeSet attrs) {
        super(context, attrs);
}

    public SildeBar(Context context) {
        super(context);
}

    /**
     * 重寫這個方法
     */
protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
// 獲取焦點改變背景顏色.
int height = getHeight();// 獲取對應高度
int width = getWidth(); // 獲取對應寬度
        // 獲取每一個字母的高度
singleHeight = (height * 1f) / b.length;
singleHeight = (height * 1f - singleHeight/2) / b.length;
        for (int i = 0; i < b.length; i++) {
           // paint.setColor(Color.rgb(23, 122, 216));
paint.setColor(Color.GRAY);
paint.setTypeface(Typeface.DEFAULT_BOLD);
paint.setAntiAlias(true);
paint.setTextSize(35);
// 選中的狀態
if (i == choose) {
                paint.setColor(Color.parseColor("#c60000"));
paint.setFakeBoldText(true);
}
            // x座標等於中間-字串寬度的一半.
float xPos = width / 2 - paint.measureText(b[i]) / 2;
            float yPos = singleHeight * i + singleHeight;
canvas.drawText(b[i], xPos, yPos, paint);
paint.reset();// 重置畫筆
}

    }

    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
    @Override
public boolean dispatchTouchEvent(MotionEvent event) {
        final int action = event.getAction();
        final float y = event.getY();// 點選y座標
final int oldChoose = choose;
        final OnTouchingLetterChangedListener listener = onTouchingLetterChangedListener;
        final int c = (int) (y / getHeight() * b.length);// 點選y座標所佔總高度的比例*b陣列的長度就等於點選b中的個數.
switch (action) {
            case MotionEvent.ACTION_UP:
                setBackgroundDrawable(new ColorDrawable(0x00808080));
choose = -1;//
invalidate();
                if (mTextDialog != null) {
                    mTextDialog.setVisibility(View.INVISIBLE);
}
                break;
// 除開鬆開事件的任何觸控事件
default:
                setBackgroundResource(R.drawable.bg_slide_bar);
                if (oldChoose != c) {
                    if (c >= 0 && c < b.length) {
                        if (listener != null) {
                            listener.onTouchingLetterChanged(b[c]);
}
                        if (mTextDialog != null) {
                            mTextDialog.setText(b[c]);
mTextDialog.setVisibility(View.VISIBLE);
// 動態改變文字dialog的位置
//                            int right = mTextDialog.getLeft();
//                            mTextDialog.setX(right / 2 * 3);
//                            if(c>24){
//                                mTextDialog.setY(singleHeight * 24);
//                            }else{
//                                mTextDialog.setY(singleHeight * c);
//                            }
mTextDialog.setBackground(getContext().getResources().getDrawable(dialogColor[c / 6]));
}

                        choose = c;
invalidate();
}
                }

                break;
}
        return true;
}

    /**
     * 向外公開的方法
     *
     * @param onTouchingLetterChangedListener
*/
public void setOnTouchingLetterChangedListener(OnTouchingLetterChangedListener onTouchingLetterChangedListener) {
        this.onTouchingLetterChangedListener = onTouchingLetterChangedListener;
}

    /**
     * 介面
     *
     * @author coder
     *
     */
public interface OnTouchingLetterChangedListener {
        public void onTouchingLetterChanged(String s);
}

}

第二種 就是開源專案

 QuickSideBarView 這個 去百度搜一下  挺好用的

public  abstract  class RcvAdapter<VH extends RecyclerView.ViewHolder> extends  RecyclerView.Adapter<VH>{

    private ArrayList<ContactListInfo> item = new ArrayList<ContactListInfo>();
    public RcvAdapter(){
        setHasStableIds(true);
}

    public void add(ContactListInfo object){
        item.add(object);
notifyDataSetChanged();
}
//新增 索引 列表
public void add(int index ,ContactListInfo object){
        item.add(index,object);
}
//新增成哥列表的資料進去
public void addAll(Collection<? extends ContactListInfo> collection){
        if(collection!=null){
            item.addAll(collection);
notifyDataSetChanged();
}
    }
    public void addAll(ContactListInfo... items){
        addAll(Arrays.asList(items));
}

    public void clear() {
        item.clear();
notifyDataSetChanged();
}
    public void remove(String object) {
        item.remove(object);
notifyDataSetChanged();
}
    public ContactListInfo getItem(int position){
        return item.get(position);
}

    @Override
public long getItemId(int position) {
        return  getItem(position).hashCode();
}

    @Override
public int getItemCount() {
        return item.size();
}

    public abstract long getHeaderId(int position);
    public abstract RecyclerView.ViewHolder onCreateHeaderViewHolder(ViewGroup parent);
    public abstract void onBindHeaderViewHolder(RecyclerView.ViewHolder holder, int position);
}