自定义view梯式布局

package bwei.com.zhou1_demo;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

public class FlowLayout extends ViewGroup {

    private int widthSize;
    private int widthMode;
    private int heghtSize;
    private int heightMode;

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

    public FlowLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public FlowLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        measureChildren(widthMeasureSpec, heightMeasureSpec);
        widthSize = MeasureSpec.getSize(widthMeasureSpec);
        int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        int heightSize = MeasureSpec.getSize(heightMeasureSpec);
        int heightMode = MeasureSpec.getMode(heightMeasureSpec);
        int width = 0;
        int height = 0;
        int lineWidth = 0;
        int lineHeight = 0;
        int totalHeight = 0;
        View childView;
        int childWidth = 0;
        int childHeight = 0;

        for (int i = 0; i < getChildCount(); i++) {
            childView = getChildAt(i);
            childWidth = childView.getMeasuredWidth();
            childHeight = childView.getMeasuredHeight();
            if (lineWidth+childWidth>= widthSize) {
                width = widthSize;
                totalHeight += lineHeight;
                lineHeight = childHeight;
                lineWidth = childWidth;

            } else {
                lineWidth += childWidth;
                lineHeight = Math.max(lineHeight, childHeight);
                width = Math.max(width, lineWidth);
            }
            if (i == getChildCount() - 1) {
                totalHeight += lineHeight;
                height = totalHeight;
            }

        }

        width = widthMode == MeasureSpec.EXACTLY ? widthSize : width;
        height = heightMode == MeasureSpec.EXACTLY ? heightSize : height;
        setMeasuredDimension(width, height);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int lineWidth = 0;
        int lineHeight = 0;
        int totalHeight = 0;
        View childView;
        int childWidth = 0;
        int childHeight = 0;
        for (int i = 0; i < getChildCount(); i++) {
            childView = getChildAt(i);
            childWidth=widthSize/2;
            childHeight=childView.getMeasuredHeight();
            if (i%2==0){
                totalHeight+=childHeight;
                lineWidth=0;

                childView.layout(lineWidth,totalHeight,lineWidth+childWidth,totalHeight+childHeight);
            }else{
                totalHeight+=childHeight;
                lineWidth=childWidth;
                childView.layout(lineWidth,totalHeight,lineWidth+childWidth,totalHeight+childHeight);
            }
        }
    }
}