RadioButton实现自动换行的效果

来源：互联网发布：单词朗读软件编辑：程序博客网时间：2024/06/05 02:35
android中单选按钮没有自动换行的效果，这里继承RadioGroup实现自动换行，效果如图所示：
这里写图片描述
实现方法：
public class FlowRadioGroup extends RadioGroup {    public FlowRadioGroup(Context context) {        super(context);    }    public FlowRadioGroup(Context context, AttributeSet attrs) {        super(context, attrs);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        //获取最大宽度        int maxWidth = MeasureSpec.getSize(widthMeasureSpec);        //获取Group中的Child数量        int childCount = getChildCount();        //设置Group的左边距，下面也会使用x计算每行所占的宽度        int x = 0;        //设置Group的上边距，下面也会使用y计算Group所占的高度        int y = 30;        //设置Group的行数        int row = 0;        for (int index = 0; index < childCount; index++) {            final View child = getChildAt(index);            if (child.getVisibility() != View.GONE) {                child.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);                //重新计算child的宽高                int width = child.getMeasuredWidth();                int height = child.getMeasuredHeight();                //添加到X中，(width+10) 设置child左边距                x += (width + 10);                //行数*child高度+这次child高度=现在Group的高度,(height + 10)设置child上边距                y = row * (height + 10) + (height + 10);                //当前行宽X大于Group的最大宽度时，进行换行                if (x > maxWidth) {                    //当index不为0时，进行row++，防止FirstChild出现大于maxWidth时,提前进行row++                    if (index != 0)                        row++;                    //child的width大于maxWidth时，重新设置child的width为最大宽度                    if (width >= maxWidth) {                        width = maxWidth - 30;                    }                    //重新设置当前X                    x = (width + 20);                    //重新设置现在Group的高度                    y = row * (height + 10) + (height + 10);                }            }        }        // 设置容器所需的宽度和高度        setMeasuredDimension(maxWidth, y);    }    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        final int childCount = getChildCount();        int maxWidth = r - l;        int x = 10;        int y = 0;        int row = 0;        for (int i = 0; i < childCount; i++) {            final View child = this.getChildAt(i);            if (child.getVisibility() != View.GONE) {                int width = child.getMeasuredWidth();                int height = child.getMeasuredHeight();                x += (width + 10);                y = row * (height + 10) + (height + 10);                if (x > maxWidth) {                    if (i != 0)                        row++;                    if (width >= maxWidth) {                        width = maxWidth - 30;                    }                    x = (width + 20);                    y = row * (height + 10) + (height + 10);                }                child.layout(x - width, y - height, x, y);            }        }    }}
源码

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