ScrollView水平滑动条选中条目的居中显示

创建选择器实现圆角矩形    <shape xmlns:android="http://schemas.android.com/apk/res/android"        android:shape="rectangle" >        <corners android:radius="5dip"/>        <solid android:color="#33ff0000"/>    </shape>创建选择器实现字体颜色改变    <selector xmlns:android="http://schemas.android.com/apk/res/android" >        <item android:state_selected="true" android:color="@android:color/white"></item>        <item android:state_pressed="true" android:color="@android:color/white"></item>        <item android:color="@android:color/darker_gray"></item>    </selector>创建选择器实现背景颜色改变    <selector xmlns:android="http://schemas.android.com/apk/res/android" >        <item android:state_selected="true" android:drawable="@drawable/bgshape_shape"></item>        <item android:state_pressed="true" android:drawable="@drawable/bgshape_shape"></item>    </selector>布局文件引用    <TextView        android:layout_width="80dip"        android:layout_height="wrap_content"        android:gravity="center"        android:textColor="@drawable/textcolor_selector"        android:background="@drawable/bgcolor_selector"        android:padding="5dip"        android:text="热门" />MainActivity后台代码实现    private int screenWitdth;    private HorizontalScrollView hsv;    private LinearLayout ll;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //获得屏幕宽度        screenWitdth = getResources().getDisplayMetrics().widthPixels;        //初始化视图        initView();        //子控件点击事件        initEvent();    }    //初始化视图    private void initView(){        hsv = (HorizontalScrollView) findViewById(R.id.hsv);        ll = (LinearLayout) findViewById(R.id.ll);        //默认选中第一个子控件        hsv.getChildAt(0).setSelected(true);    }    //定义子控件点击事件    private void initEvent(){        //获得水平滑动控件中子控件——水平线性布局内共有多少子控件        int childrenCount=hsv.getChildCount();        //对子控件循环监听        for(int i=0; i<childrenCount; i++){            final int currentIndex=i;            //获得当前子控件            View childView=hsv.getChildAt(i);            //对当前子控件设置点击监听事件            childView.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    //设置当前子控件诶选中                    selectChildView(currentIndex);                }            });        }    }    //对点击选中的子控件进行设置    private void selectChildView(int position){        int childrenCount=hsv.getChildCount();        for(int i=0; i<childrenCount; i++){            //获得当前子控件对象，并设置为选中状态            View child=hsv.getChildAt(i);            child.setSelected(true);        }        //设置选中条目居中        View currentView=hsv.getChildAt(position);        int left=currentView.getLeft();     //获取点击控件与父控件左侧的距离        int width=currentView.getMeasuredWidth();   //获得控件本身宽度        int toX=left+width/2-screenWitdth/2;        //使条目移动到居中显示        hsv.smoothScrollTo(toX, 0);    }