HorizontalTabhost

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//继承LinearLayout

public class HorScollTablhost extends LinearLayout implements ViewPager.OnPageChangeListener {

    private Context context;
    private LinearLayout layout_th;
    private ViewPager vp;

    private List<String> stringList;
    private List<Fragment> fragmentList;

    private int color;

    public HorScollTablhost(Context context) {

        this(context,null);
    }

    public HorScollTablhost(Context context, @Nullable AttributeSet attrs) {
        this(context,attrs,0);
    }

    public HorScollTablhost(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context,attrs);
    }

    /**
     * 初始化控件
     */
    private void init(Context context, AttributeSet attrs)
    {
        this.context=context;

        //找定义属性（attrs,自定义属性的）

TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.HorScollTablhost);

//调用方法（id,默认值）-->需要在values中写方法

color = typedArray.getColor(R.styleable.HorScollTablhost_zcolor, 0xff0099);

        //回收
        typedArray.recycle();

        //找控件(找布局，自定义的布局赋给自定义的控件，确定）
        View view = LayoutInflater.from(context).inflate(R.layout.hortablhost,this,true);//
        layout_th = view.findViewById(R.id.layout_th);
        vp = view.findViewById(R.id.vp);
        //设置监听
        vp.addOnPageChangeListener(this);
    }

    /**
     * 设置参数（主方法传的）
     */
    public void setData(List<String> stringList, List<Fragment> fragmentList)
    {
        this.stringList=stringList;
        this.fragmentList=fragmentList;

        //绘制界面
        draw();
    }

    /**
     * 绘制界面
     */
    private void draw() {

        for (int i = 0; i < stringList.size(); i++) {

            TextView tv=new TextView(context);
            final int finalI = i;

            //设置文字点击事件
            tv.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View view) {
                    vp.setCurrentItem(finalI);
                }
            });

            //设置字间距（宽高）
            LinearLayout.LayoutParams params = new LayoutParams(63, ViewGroup.LayoutParams.MATCH_PARENT);

            //设置字体颜色
            tv.setTextColor(getResources().getColorStateList(R.drawable.font_color));

            //设置文字
            tv.setText(stringList.get(i));

            //居中
            tv.setGravity(Gravity.CENTER);

            //添加到LinearLayout
            layout_th.addView(tv,params);
        }

        //第一个默认选中
        TextView w = (TextView) layout_th.getChildAt(0);
        w.setSelected(true);

        //设置背景颜色（接收的颜色属性）
        layout_th.setBackgroundColor(color);

        //添加适配器frgment
        FragmentManager fm=((FragmentActivity)context).getSupportFragmentManager();
        Adapter adapter=new Adapter(fm,fragmentList);
        vp.setAdapter(adapter);
    }

    /**
     * 设置vp监听
     * @param position
     * @param positionOffset
     * @param positionOffsetPixels
     */
    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
    }

    @Override
    public void onPageSelected(int position) {

        for (int i = 0; i < stringList.size(); i++)
        {
            TextView childAt = (TextView) layout_th.getChildAt(i);
            if (i==position) {

                //设置选中状态
                childAt.setSelected(true);
            }
            else
            {
                //设置选中状态
                childAt.setSelected(false);
            }
        }
    }

    @Override
    public void onPageScrollStateChanged(int state) {
    }

}

定义适配器继承FragmentPagerAdapter

public class Adapter extends FragmentPagerAdapter{

      private List<Fragment> fragmentList;

    /*public void setdata(List<Fragment> fragmentList) {
          this.fragmentList=fragmentList;
      }*/

    public Adapter(FragmentManager fm,List<Fragment> fragmentList) {
        super(fm);
        this.fragmentList=fragmentList;
    }

    @Override
    public Fragment getItem(int position) {
        return fragmentList.get(position);
    }

    @Override
    public int getCount() {
        return fragmentList.size();
    }
}

主mainActivity函数中
HorScollTablhost h= (HorScollTablhost) findViewById(R.id.h);

//横划

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