自定義多行多列的RadioGroup

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,並
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


這裏寫圖片描述
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+起始位置座標,如果大於父控件高度,就換行
                int w = rb.getMeasuredWidth() + 2 * childMarginHorizontal + startX + getPaddingLeft() + getPaddingRight();
                if (w > getMeasuredWidth()) {
                    startX = 0;
                    rowNm++;
                }
                //否則起始位置後移
                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,還是很詳細的註釋

  @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);
            //繪製每個子控件的位置
            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+起始位置座標,如果大於父控件高度,就換行
                int w = rb.getMeasuredWidth() + 2 * childMarginHorizontal + startX + getPaddingLeft() + getPaddingRight();
                if (w > getMeasuredWidth()) {
                    startX = 0;
                    rowNm++;
                }
                //否則起始位置後移
                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);
            //繪製每個子控件的位置
            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,最好爲根節點爲RadioButton 的layout
     * @param layout_id 子控件的Id
     */
    public void setChild(int layout_id){
        this.childId=layout_id;
    }

    /**
     * 添加一個名字爲str的控件
     * @param str
     */
    public void addView(String str) {
        childs.add(str);
        RadioButton child = getChild();
        child.setText(str);
        addView(child);
        postInvalidate();
    }
}

最後,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;
在給個子控件佈局吧

<?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>
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