HorizontalScrollView 橫向滑動標題欄的用法

原創

2020-02-21 07:19

private HorizontalScrollView horizontalScrollView;
private LinearLayout linearLayout;
private ViewPager viewPager;
private String[] titles;
private ArrayList<TextView> titlesView;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view=inflater.inflate(R.layout.activity_zixuan,container,false);
    horizontalScrollView = (HorizontalScrollView) view.findViewById(R.id.hsv);
    linearLayout = (LinearLayout) view.findViewById(R.id.zixuan_linearLayout);
    viewPager = (ViewPager) view.findViewById(R.id.viewpager);
    return view;
}

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    titles=new String[]{"數據新聞","快訊","頭條","精編公告","美股","港股","基金","理財"};
    initTitles();
    viewPager.setAdapter(new MPagerAdapter(getActivity().getSupportFragmentManager()));
    setOnClickListener();
}
private void initTitles() {
    titlesView=new ArrayList<>();
    for(int i=0;i<titles.length;i++){
        TextView textView = new TextView(getActivity());
        textView.setTextSize(20);
        if(i==0){
            textView.setTextColor(Color.BLUE);
        }
        textView.setText(titles[i]);
        textView.setId(i);
        textView.setOnClickListener(this);
        LinearLayout.LayoutParams layoutParams=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT);
        layoutParams.setMargins(10,10,10,10);
        linearLayout.addView(textView,layoutParams);
        titlesView.add(textView);
    }
}

private void setOnClickListener() {
    viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
            for(int i=0;i<titles.length;i++){
             if(i==position){
                 titlesView.get(i).setTextColor(Color.BLUE);
             } else{
                 titlesView.get(i).setTextColor(Color.BLACK);
             }
            }
           /* int width=titlesView.get(position).getWidth();
            int tatalWidth=(width+20)*position;*/
           int x=(int)linearLayout.getChildAt(position%titlesView.size()).getX();
            horizontalScrollView.scrollTo(x,0);

        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    });
}



@Override
public void onClick(View view) {
    int position=view.getId();
    viewPager.setCurrentItem(position);

}

private class MPagerAdapter extends FragmentPagerAdapter {
    public MPagerAdapter(FragmentManager fm) {
        super(fm);

    }

    @Override
    public Fragment getItem(int position) {
        return MFragment.getInstance(titles[position]);
    }

    @Override
    public int getCount() {
        return titles.length;
    }

    
}