最近在工作的時候,需要用到一個多行多列的radioGroup,在網上找資料的時候,又找不掉合適的,所以只好自己寫一個,同時也個那些需要這個功能的人一些參考;
首先,我先分析了一下,我需要的僅僅是一個可以多行多列顯示的控件,但是radioGroup卻只有橫向和縱向,并
不支持換行,最近剛剛好看了一些自定義控件的內容,因此,想想可以自己定義一個控件,當然,還是要繼承自radioGroup,這樣可以節省很多的功能;
剩下的,做的就是重寫onMeasure和onLayout兩個方法,來對子控件進行排列,實現多行效果,先上張圖:
這是簡單的效果圖,控件的寬度是子控件自己決定的
這里寫圖片描述
該上關鍵代碼啦
@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);
//測量子控件
measureChild(rb, widthMeasureSpec, heightMeasureSpec);
//子控件寬度+起始位置坐標,如果大于父控件高度,就換行
int w = rb.getMeasuredWidth() + 2 * childMarginHorizontal + startX + getPaddingLeft() + getPaddingRight();
if (w > getMeasuredWidth()) {
startX = 0;
rowNm++;
}
//否則起始位置后移
startX += rb.getMeasuredWidth() + 2 * childMarginHorizontal;
height = (rowNm + 1) * (rb.getMeasuredHeight() + 2 * childMarginVertical) + getPaddingBottom() + getPaddingTop();
}
}
JLog.i(startX + "測量的高度" + height);
setMeasuredDimension(getMeasuredWidth(), height);
}
Layout方法,還是很詳細的注釋
@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);
//繪制每個子控件的位置
rb.layout(startX, startY, startX + rb.getMeasuredWidth(), startY + rb.getMeasuredHeight());
startX += rb.getMeasuredWidth() + 2 * childMarginHorizontal;
}
}
好了,關鍵代碼還是很簡單的,這下自己就不用再麻煩的找了,自己寫一個就好了,而且十分好用啊;現在上全部代碼吧,是分簡單
public class CustomRadioGoup extends RadioGroup {
private int startX = 0, startY = 0, rowNm = 0;
private List<String> childs = new ArrayList<>();
private int childId =-1;
/**
* 橫向間距
*/
private int childMarginHorizontal = 10;
/**
* 縱向間距
*/
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);
//測量子控件
measureChild(rb, widthMeasureSpec, heightMeasureSpec);
//子控件寬度+起始位置坐標,如果大于父控件高度,就換行
int w = rb.getMeasuredWidth() + 2 * childMarginHorizontal + startX + getPaddingLeft() + getPaddingRight();
if (w > getMeasuredWidth()) {
startX = 0;
rowNm++;
}
//否則起始位置后移
startX += rb.getMeasuredWidth() + 2 * childMarginHorizontal;
height = (rowNm + 1) * (rb.getMeasuredHeight() + 2 * childMarginVertical) + getPaddingBottom() + getPaddingTop();
}
}
JLog.i(startX + "測量的高度" + 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);
//繪制每個子控件的位置
rb.layout(startX, startY, startX + rb.getMeasuredWidth(), startY + rb.getMeasuredHeight());
startX += rb.getMeasuredWidth() + 2 * childMarginHorizontal;
}
}
private RadioButton getChild() {
if (childId==-1){
throw new RuntimeException("沒有設置子控件");
}
return (RadioButton) LayoutInflater.from(getContext()).inflate(
R.layout.item, this, false);
}
/**
* 設置子控件,最好為根節點為RadioButton 的layout
* @param layout_id 子控件的Id
*/
public void setChild(int layout_id){
this.childId=layout_id;
}
/**
* 添加一個名字為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,使用的時候子控件傳進去的必須是一個layout文件的,根節點是radioButton最好了,樣式自己定義就好了,如果寬高固定,那子控件就是大小相同的,否則就是我上傳的圖片的效果;
在給個子控件布局吧
<?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="測試">
</RadioButton>