自动换行的radiogroup

自动换行的radiogroup

public class FlowRadioGroup extends LinearLayout {

public FlowRadioGroup(Context context) {
    super(context);
}

public FlowRadioGroup(Context context, AttributeSet attrs) {
    super(context, attrs);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    int maxWidth = MeasureSpec.getSize(widthMeasureSpec);
    int childCount = getChildCount();
    int x = 0;
    int y = 0;
    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);
            // 此处增加onlayout中的换行判断，用于计算所需的高度
            int width = child.getMeasuredWidth();
            int height = child.getMeasuredHeight();
            x += width;
            y = row * height + height;
            if (x > maxWidth) {
                x = width;
                row++;
                y = row * height + height;
            }
        }
    }
    // 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 = 0;
    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;
            y = row * height + height;
            if (x > maxWidth) {
                x = width;
                row++;
                y = row * height + height;
            }
            child.layout(x - width, y - height, x, y);
        }
    }
}
}