HorizontalScrollView随页面滑动

本文详细介绍了如何在活动中实现导航栏与页面切换的功能,包括布局设计、菜单设置、页面适配器与监听器的使用,以及如何通过自动滚动进行页面选择。

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效果展示:
这里写图片描述
首先看activity_main中的布局

  <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="35dp"
        android:orientation="horizontal">
        <HorizontalScrollView 
         android:id="@+id/Nav_Hsv"
         android:layout_width="0dp"
         android:layout_weight="9"
         android:layout_height="35dp"
         android:fillViewport="false">

             <LinearLayout 
                  android:id="@+id/Nav_ll"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:background="#eee"
                  android:orientation="horizontal">       
            </LinearLayout>
        </HorizontalScrollView>
</LinearLayout>
<android.support.v4.view.ViewPager
     android:id="@+id/vp"
     android:layout_width="match_parent"
     android:layout_height="0dp"
     android:layout_weight="1"/>

再看Activity里的具体实现

public class ShouActivity extends FragmentActivity {
    private List<String> type;
    private int screenWidth;
    private int itemWidth;
    private int selectItemIndex = 0;
    private LinearLayout nav_ll;
    private ViewPager vp;
    private HorizontalScrollView hsv;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        type = MyTools.getType();
        hsv = (HorizontalScrollView) findViewById(R.id.Nav_Hsv);
        hsv.setHorizontalScrollBarEnabled(false);
        nav_ll = (LinearLayout) findViewById(R.id.Nav_ll);
        vp = (ViewPager) findViewById(R.id.vp);

        //设置导航栏菜单
        setNav();

        //设置viewpager
        setViewPager();

    }
    //设置viewpager
    private void setViewPager() {
        // 实例化list集合存放fragment
        List<Fragment> fragmentList = new ArrayList<Fragment>();
        //获取map集合中的数据,遍历集合
        Map<String, String> data = MyTools.getData();
        for(Map.Entry<String, String> entry : data.entrySet()){
            //获取集合中的value值,这里指的是接口地址
            MyFragment frame = new MyFragment(entry.getValue());
            //放入集合
            fragmentList.add(frame);
        }
        //设置viewpager适配器
        vp.setAdapter(new MyFragmentpagerAdapter(getSupportFragmentManager(),fragmentList));
        //设置viewpager监听
        vp.setOnPageChangeListener(new OnPageChangeListener() {

            @Override
            public void onPageSelected(int position) {
                vp.setCurrentItem(position);
                selectType(position);

            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
                // TODO Auto-generated method stub

            }
        });
    }



    private void setNav() {
        //获得屏幕总宽度
        DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        screenWidth = metrics.widthPixels;
        //设置每个item的宽度
        itemWidth = screenWidth/type.size();
        for(int i=0;i<type.size();i++){
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                    RadioGroup.LayoutParams.WRAP_CONTENT, RadioGroup.LayoutParams.WRAP_CONTENT);
            //设置外边距
            params.leftMargin = 10;
            params.rightMargin = 10;
            //创建Textview实例
            TextView localTextView = new TextView(this);
            //设置tv的属性
            localTextView.setText(type.get(i));
            localTextView.setTextSize(15.0f);
            localTextView.setPadding(5, 9, 5, 9);
            localTextView.setGravity(Gravity.CENTER);
            if(i == 0){
                localTextView.setTextColor(Color.RED);
            }else{
                localTextView.setTextColor(Color.parseColor("#666666"));
            }
            if(selectItemIndex == i){
                localTextView.setSelected(true);
            }
            //设置每个tv的监听
            localTextView.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    for(int i=0;i<nav_ll.getChildCount();i++){
                        TextView tv = (TextView) nav_ll.getChildAt(i);
                        if(tv == v){
                            tv.setSelected(true);
                            vp.setCurrentItem(i);
                        }else{
                            tv.setSelected(false);
                        }
                    }

                }
            });
            nav_ll.addView(localTextView, i, params);
        }
    }

    protected void selectType(int tab_position) {
        selectItemIndex = tab_position;
        //通过自动滚动
        for(int i=0;i<nav_ll.getChildCount();i++){
            TextView tv0 = (TextView) nav_ll.getChildAt(tab_position);
            int k = tv0.getMeasuredWidth();
            int l = tv0.getLeft();
            int j = l+k/2-screenWidth/2;//计算要滚动到的位置
            hsv.smoothScrollTo(j, 0);
        }
        //判断哪一个tv被选中设置字体颜色
        for(int i=0;i<nav_ll.getChildCount();i++){
            TextView view = (TextView) nav_ll.getChildAt(i);
            if(tab_position == i){
                view.setTextColor(Color.RED);
                view.setSelected(true);
            }else{
                view.setTextColor(Color.parseColor("#666666"));
                view.setSelected(false);
            }
        }

    }
}

MyTools.java

public class MyTools {
    public static Map<String,String> getData(){
        Map<String,String> map = new LinkedHashMap<String, String>();
        map.put("推荐", "http://ic.snssdk.com/2/article/v25/stream/?category=news_world&count=20&min_behot_time=1457664837&bd_city=%E5%8C%97%E4%BA%AC%E5%B8%82&bd_latitude=40.040363&bd_longitude=116.299497&bd_loc_time=1457665192&loc_mode=6&iid=3839775475&device_id=12246433856&ac=wifi&channel=baidu&aid=13&app_name=news_article&version_code=460&device_platform=android&device_type=HONOR%20H30-L02&os_api=19&os_version=4.4.2&uuid=864503020467518&openudid=58561e2e62ae7a9d");
        map.put("热点", "http://ic.snssdk.com/2/article/v25/stream/?category=news_hot&count=20&min_behot_time=1457678235&bd_city=%E5%8C%97%E4%BA%AC%E5%B8%82&bd_latitude=40.040344&bd_longitude=116.299473&bd_loc_time=1457746072&loc_mode=6&iid=3839775475&device_id=12246433856&ac=wifi&channel=baidu&aid=13&app_name=news_article&version_code=460&device_platform=android&device_type=HONOR%20H30-L02&os_api=19&os_version=4.4.2&uuid=864503020467518&openudid=58561e2e62ae7a9d");
        map.put("北京", "http://lf.snssdk.com/2/article/v25/stream/?category=news_local&count=20&min_behot_time=1457679653&loc_mode=4&user_city=%E5%8C%97%E4%BA%AC&lac=4530&cid=28615&iid=3840045724&device_id=12248484527&ac=wifi&channel=baidu&aid=13&app_name=news_article&version_code=460&device_platform=android&device_type=MX5&os_api=22&os_version=5.1&uuid=868773026086424&openudid=8731cb97031b705c");
        map.put("社会", "http://ic.snssdk.com/2/article/v25/stream/?category=news_society&count=20&min_behot_time=1457665368&bd_latitude=4.9E-324&bd_longitude=4.9E-324&bd_loc_time=1457678205&loc_mode=5&lac=4527&cid=28883&iid=3837100257&device_id=12226275484&ac=wifi&channel=baidu&aid=13&app_name=news_article&version_code=460&device_platform=android&device_type=iToolsAVM&os_api=19&os_version=4.4.4&uuid=352284046469130&openudid=84c1c7b192991cc6");
        map.put("娱乐", "http://ic.snssdk.com/2/article/v25/stream/?category=news_entertainment&count=20&min_behot_time=1457661848&bd_city=%E5%8C%97%E4%BA%AC%E5%B8%82&bd_latitude=40.040344&bd_longitude=116.299473&bd_loc_time=1457746072&loc_mode=6&iid=3839775475&device_id=12246433856&ac=wifi&channel=baidu&aid=13&app_name=news_article&version_code=460&device_platform=android&device_type=HONOR%20H30-L02&os_api=19&os_version=4.4.2&uuid=864503020467518&openudid=58561e2e62ae7a9d");
        map.put("科技", "http://ic.snssdk.com/2/article/v25/stream/?category=news_tech&count=20&min_behot_time=1457664599&bd_city=%E5%8C%97%E4%BA%AC%E5%B8%82&bd_latitude=40.040344&bd_longitude=116.299473&bd_loc_time=1457746072&loc_mode=6&iid=3839775475&device_id=12246433856&ac=wifi&channel=baidu&aid=13&app_name=news_article&version_code=460&device_platform=android&device_type=HONOR%20H30-L02&os_api=19&os_version=4.4.2&uuid=864503020467518&openudid=58561e2e62ae7a9d");
        map.put("体育", "http://ic.snssdk.com/2/article/v25/stream/?category=news_sports&count=20&bd_city=%E5%8C%97%E4%BA%AC%E5%B8%82&bd_latitude=40.040344&bd_longitude=116.299473&bd_loc_time=1457746072&loc_mode=6&iid=3839775475&device_id=12246433856&ac=wifi&channel=baidu&aid=13&app_name=news_article&version_code=460&device_platform=android&device_type=HONOR%20H30-L02&os_api=19&os_version=4.4.2&uuid=864503020467518&openudid=58561e2e62ae7a9d");
        map.put("视频", "http://ic.snssdk.com/2/article/v25/stream/?category=video&count=20&bd_latitude=4.9E-324&bd_longitude=4.9E-324&bd_loc_time=1457678205&loc_mode=5&lac=4527&cid=28883&iid=3837100257&device_id=12226275484&ac=wifi&channel=baidu&aid=13&app_name=news_article&version_code=460&device_platform=android&device_type=iToolsAVM&os_api=19&os_version=4.4.4&uuid=352284046469130&openudid=84c1c7b192991cc6");
        map.put("财经", "http://lf.snssdk.com/2/article/v25/stream/?category=news_finance&count=20&loc_mode=4&iid=3839898905&device_id=10679574422&ac=wifi&channel=baidu&aid=13&app_name=news_article&version_code=460&device_platform=android&device_type=MX5&os_api=22&os_version=5.1&uuid=867992020732921&openudid=db1bf632ed3a9c71");
        return map;
    }
    public static List<String> getType(){
        List<String> typelist = Arrays.asList("推荐", "热点", "北京","社会", "娱乐", "科技","体育","视频","财经");
        return typelist;

    }
}
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