自定义多行多列的RadioGroup

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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<String> 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

<?xml version="1.0" encoding="utf-8"?><RadioButton xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:background="#fedcba"    android:text="测试"></RadioButton>
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