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public class FlowLayout extends ViewGroup {    private ArrayList<View> lineViews;    private ArrayList<ArrayList<View>> allViews;    public FlowLayout(Context context) {        this(context, null);    }    public FlowLayout(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public FlowLayout(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        lineViews = new ArrayList<>();        allViews = new ArrayList<>();    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        int widthSize = MeasureSpec.getSize(widthMeasureSpec);        int widthMode = MeasureSpec.getMode(widthMeasureSpec);        int heightSize = MeasureSpec.getSize(heightMeasureSpec);        int heightMode = MeasureSpec.getMode(heightMeasureSpec);        //最后测量的高度        int height = 0;        //最后测量的宽度        int width = 0;        lineViews.clear();        allViews.clear();        //记录行的高度        int lineHeight = 0;        //记录行的宽度        int lineWidth = 0;        for (int i = 0; i < getChildCount(); i++) {            View childView = getChildAt(i);            //测量子View的大小            measureChild(childView, widthMeasureSpec, heightMeasureSpec);            MarginLayoutParams params = (MarginLayoutParams) childView.getLayoutParams();            int childHeight = childView.getMeasuredHeight() + params.topMargin + params.bottomMargin;            int childWidth = childView.getMeasuredWidth() + params.leftMargin + params.rightMargin;            //如果当前行宽+子view的宽度大于父控件给的宽度，则表示要转行            if (lineWidth + childWidth > widthSize - getPaddingLeft() - getPaddingRight()) {                width = Math.max(width, lineWidth);                height += lineHeight;                //重置行的宽和高                lineWidth = childWidth;                lineHeight = childHeight;                allViews.add(lineViews);                lineViews = new ArrayList<>();                //lineViews.clear();                lineViews.add(childView);            } else {//不转行                //行高为当前行中子View高度最高的                lineHeight = Math.max(childHeight, lineHeight);                //行宽为子View宽度相加                lineWidth += childWidth;                lineViews.add(childView);            }            //如果是最后一行，则要加上最后一行的高度和与之前的宽度比较            if (i == getChildCount() - 1) {                height += lineHeight + getPaddingTop() + getPaddingBottom();                width = Math.max(width, lineWidth);                allViews.add(lineViews);            }        }        setMeasuredDimension(                widthMode == MeasureSpec.AT_MOST ? width : widthSize,                heightMode == MeasureSpec.AT_MOST ? height : heightSize);    }    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        int w = getPaddingLeft();        int h = getPaddingTop();        int hh = 0;        for (int i = 0; i < allViews.size(); i++) {            for (int j = 0; j < allViews.get(i).size(); j++) {                View child = allViews.get(i).get(j);                if (child.getVisibility() == View.GONE) continue;                MarginLayoutParams param = (MarginLayoutParams) child.getLayoutParams();                int lc = param.leftMargin;                int tc = param.topMargin;                int rc = lc + child.getMeasuredWidth();                int bc = tc + child.getMeasuredHeight();                child.layout(lc + w, tc + h, rc + w, bc + h);                w += (rc + param.rightMargin);                hh = Math.max(bc + param.bottomMargin, hh);            }            w = getPaddingLeft();            h += hh;        }    }    @Override    public LayoutParams generateLayoutParams(AttributeSet attrs) {        return new MarginLayoutParams(getContext(), attrs);    }}