自定义多行多列的RadioGroup

最近在工作的时候,需要用到一个多行多列的radioGroup,在网上找资料的时候,又找不掉合适的,所以只好自己写一个,同时也个那些需要这个功能的人一些参考;
首先,我先分析了一下,我需要的仅仅是一个可以多行多列显示的控件,但是radioGroup却只有横向和纵向,并
不支持换行,最近刚刚好看了一些自定义控件的内容,因此,想想可以自己定义一个控件,当然,还是要继承自radioGroup,这样可以节省很多的功能;
剩下的,做的就是重写onMeasure和onLayout两个方法,来对子控件进行排列,实现多行效果,先上张图:

这是简单的效果图,控件的宽度是子控件自己决定的


这里写图片描述
该上关键代码啦
 @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int height = 0;
        if (getChildCount() > 0) {
            startX = 0;
            //父控件高度
            rowNm = 0;
            for (int i = 0; i < getChildCount(); i++) {
                RadioButton rb = (RadioButton) getChildAt(i);
                //测量子控件
                measureChild(rb, widthMeasureSpec, heightMeasureSpec);
                //子控件宽度+起始位置坐标,如果大于父控件高度,就换行
                int w = rb.getMeasuredWidth() + 2 * childMarginHorizontal + startX + getPaddingLeft() + getPaddingRight();
                if (w > getMeasuredWidth()) {
                    startX = 0;
                    rowNm++;
                }
                //否则起始位置后移
                startX += rb.getMeasuredWidth() + 2 * childMarginHorizontal;
                height = (rowNm + 1) * (rb.getMeasuredHeight() + 2 * childMarginVertical) + getPaddingBottom() + getPaddingTop();
            }
        }
        JLog.i(startX + "测量的高度" + height);
        setMeasuredDimension(getMeasuredWidth(), height);
    }

Layout方法,还是很详细的注释

  @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        startX = 0;
        startY = 0;
        rowNm = 0;
        for (int i = 0; i < getChildCount(); i++) {

            RadioButton rb = (RadioButton) getChildAt(i);
            int w = rb.getMeasuredWidth() + 2 * childMarginHorizontal + startX + getPaddingLeft() + getPaddingRight();
            if (w > getMeasuredWidth()) {
                startX = 0;
                rowNm++;
            }
            startY = rowNm * (rb.getMeasuredHeight() + 2 * childMarginVertical);
            JLog.i("=====onLayout=====" + startX + "===" + rowNm + "==" + startY);
            //绘制每个子控件的位置
            rb.layout(startX, startY, startX + rb.getMeasuredWidth(), startY + rb.getMeasuredHeight());
            startX += rb.getMeasuredWidth() + 2 * childMarginHorizontal;


        }


    } 

好了,关键代码还是很简单的,这下自己就不用再麻烦的找了,自己写一个就好了,而且十分好用啊;现在上全部代码吧,是分简单

public class CustomRadioGoup extends RadioGroup {

   
    private int startX = 0, startY = 0, rowNm = 0;

    private List childs = new ArrayList<>();

    private int childId =-1;

    /**
     * 横向间距
     */
    private int childMarginHorizontal = 10;
    /**
     * 纵向间距
     */
    private int childMarginVertical = 10;


    public CustomRadioGoup(Context context) {
        super(context);

    }

    public CustomRadioGoup(Context context, AttributeSet attrs) {
        super(context, attrs);

    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int height = 0;
        if (getChildCount() > 0) {
            startX = 0;
            //父控件高度

            rowNm = 0;
            for (int i = 0; i < getChildCount(); i++) {

                RadioButton rb = (RadioButton) getChildAt(i);
                //测量子控件
                measureChild(rb, widthMeasureSpec, heightMeasureSpec);

                //子控件宽度+起始位置坐标,如果大于父控件高度,就换行
                int w = rb.getMeasuredWidth() + 2 * childMarginHorizontal + startX + getPaddingLeft() + getPaddingRight();
                if (w > getMeasuredWidth()) {
                    startX = 0;
                    rowNm++;
                }
                //否则起始位置后移
                startX += rb.getMeasuredWidth() + 2 * childMarginHorizontal;
                height = (rowNm + 1) * (rb.getMeasuredHeight() + 2 * childMarginVertical) + getPaddingBottom() + getPaddingTop();

            }
        }
        JLog.i(startX + "测量的高度" + height);
        setMeasuredDimension(getMeasuredWidth(), height);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        startX = 0;
        startY = 0;
        rowNm = 0;
        for (int i = 0; i < getChildCount(); i++) {

            RadioButton rb = (RadioButton) getChildAt(i);
            int w = rb.getMeasuredWidth() + 2 * childMarginHorizontal + startX + getPaddingLeft() + getPaddingRight();
            if (w > getMeasuredWidth()) {
                startX = 0;
                rowNm++;
            }
            startY = rowNm * (rb.getMeasuredHeight() + 2 * childMarginVertical);
            JLog.i("=====onLayout=====" + startX + "===" + rowNm + "==" + startY);
            //绘制每个子控件的位置
            rb.layout(startX, startY, startX + rb.getMeasuredWidth(), startY + rb.getMeasuredHeight());
            startX += rb.getMeasuredWidth() + 2 * childMarginHorizontal;


        }


    }

    private RadioButton getChild() {
        if (childId==-1){
            throw new RuntimeException("没有设置子控件");
        }
        return (RadioButton) LayoutInflater.from(getContext()).inflate(
                R.layout.item, this, false);
    }

    /**
     * 设置子控件,最好为根节点为RadioButton 的layout
     * @param layout_id 子控件的Id
     */
    public void setChild(int layout_id){
        this.childId=layout_id;
    }

    /**
     * 添加一个名字为str的控件
     * @param str
     */
    public void addView(String str) {
        childs.add(str);
        RadioButton child = getChild();
        child.setText(str);
        addView(child);
        postInvalidate();
    }
}

最后,使用的时候子控件传进去的必须是一个layout文件的,根节点是radioButton最好了,样式自己定义就好了,如果宽高固定,那子控件就是大小相同的,否则就是我上传的图片的效果;
在给个子控件布局吧




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