HorizontalScrollView标题滑动

1.写在xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    tools:context=".MainActivity">

    <HorizontalScrollView
        android:id="@+id/hs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scrollbars="none"
        >
        <LinearLayout
            android:id="@+id/ll"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
        </LinearLayout>
    </HorizontalScrollView>
    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/hs"/>


</RelativeLayout>

2.写activity中

import android.graphics.Color;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private HorizontalScrollView hs;
    private LinearLayout ll;
    private ViewPager viewPager;
    //定义数组标题
    private String[] titles={"头条","娱乐","科技","信息","八卦","生活"};
   //定义集合 里面装TextView
    List<TextView> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //获取资源ID
        hs=findViewById(R.id.hs);
        ll=findViewById(R.id.ll);
        viewPager=findViewById(R.id.viewpager);

        //创建集合
        list=new ArrayList<>();

        //遍历数组
        for (int i=0;i<titles.length;i++){
            //创建TextView
            TextView textView=new TextView(this);
            //根据下标得到标题
            textView.setText(titles[i]);
            //每个标题字的大小
            textView.setTextSize(20);
            //id
            textView.setId(i);

            //textview的点击事件
            textView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    //得到Id
                    int id = view.getId();
                    //根据id得到viewpager的条目
                    viewPager.setCurrentItem(id);
                }
            });
            //刚进程序第一个默认红色，其他为黑色
            if(i==0){
                textView.setTextColor(Color.RED);
            }else {
                textView.setTextColor(Color.BLACK);
            }

            //创建布局
            LinearLayout.LayoutParams layoutParams=new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);
            //设置LinearLayout 左右宽高
            layoutParams.setMargins(50,10,50,10);
            //添加到布局中
            ll.addView(textView,layoutParams);
            //添加到集合中
            list.add(textView);
        }

        //viewpager的适配器
        viewPager.setAdapter(new MyAdapter(getSupportFragmentManager()));
        //viewpager的监听
        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            //滑动改变颜色
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
                for (int i=0;i<list.size();i++){
                    //list中存放的是 TextView
                    if (position==i){
                     list.get(i).setTextColor(Color.RED);
                    }else {
                    list.get(i).setTextColor(Color.BLACK);
                    }
                    //获取当前Textview
                    TextView textView=list.get(position);
                    //每次滑动的间距
                   int width= textView.getWidth()+10;
                   //让scrollView滑动   滑动距离是textview之间的间距
                   hs.scrollTo(width*position,0);
                }
            }

            @Override
            public void onPageSelected(int position) {

            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });
    }

   class MyAdapter extends FragmentPagerAdapter {
        public MyAdapter(FragmentManager fm) {
            super(fm);
        }

       @Override
       public Fragment getItem(int position) {
           return FragmentOne.getInstance(list.get(position).getText().toString());
       }

       @Override
       public int getCount() {
           return list.size();
       }
   }
}
3.定义一个fragement

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class Fragment1 extends Fragment {

    public static Fragment getinstance(String title){
        //创建Fragment1
        Fragment1 fragment1 = new Fragment1();
        //创建bundle
        Bundle bundle = new Bundle();
        //添加值
        bundle.putString("title",title);
        //把值添加到Arguments中
        fragment1.setArguments(bundle);
        return fragment1;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        //获取Arguments
        Bundle arguments = getArguments();
        //获取值
        String title = arguments.getString("title");
        //创建textview
        TextView textView = new TextView(getActivity());
        //设置值
        textView.setText(title);
        return textView;
    }


}