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
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