package com.jiuxi.marriage.module.goods.manager;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;
import android.view.ViewGroup;
import com.jiuxi.marriage.utils.AppUtil;
import com.socks.library.KLog;
/**
* Created by jiuxi on 17/5/22.
*/
public class NewStaggeredGridLayoutManager extends StaggeredGridLayoutManager {
private boolean isScrollEnabled = true;
public NewStaggeredGridLayoutManager(int spanCount, int orientation, Context mContext) {
super(spanCount, orientation);
mHeightArray = new int[spanCount];
this.mContext = mContext;
for (int i = 0; i < spanCount; i++)
mHeightArray[i] = 0;
}
private int[] mMeasuredDimension = new int[2];
private int[] mHeightArray;
private Context mContext;
@Override
public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
try {
super.onLayoutChildren(recycler, state);
} catch (IndexOutOfBoundsException e) {
//手动catch住
e.printStackTrace();
KLog.e("WrapContentGridLayoutManager", "手动捕获异常:" + e.getMessage());
}
}
//设置recycleview是否能滑动
public void setScrollEnabled(boolean flag) {
this.isScrollEnabled = flag;
}
@Override
public boolean canScrollVertically() {
//Similarly you can customize "canScrollHorizontally()" for managing horizontal scroll
return isScrollEnabled && super.canScrollVertically();
}
@Override
public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, int widthSpec, int heightSpec) {
final int widthMode = View.MeasureSpec.getMode(widthSpec);
final int heightMode = View.MeasureSpec.getMode(heightSpec);
final int widthSize = View.MeasureSpec.getSize(widthSpec);
final int heightSize = View.MeasureSpec.getSize(heightSpec);
int width = 0;
int height = 0;
int count = getItemCount();
int span = getSpanCount();
for (int i = 0; i < span; i++)//防止多次调用onMeasure方法造成数据叠加
mHeightArray[i] = 0;
for (int i = 0; i < count; i++) {
measureScrapChild(recycler, i,
View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
mMeasuredDimension);
if (getOrientation() == HORIZONTAL)
calculatorStaggeredHeight(mMeasuredDimension[0]);
else
calculatorStaggeredHeight(mMeasuredDimension[1]);
}
if (getOrientation() == HORIZONTAL) {
width = sort(mHeightArray);
// height = ScreenUtils.getScreenHeight(mContext);//获取屏幕高度
height = AppUtil.getScreenHeight(mContext);
} else {
height = sort(mHeightArray);
// width = ScreenUtils.getScreenHeight(mContext);//获取屏幕宽度
width = AppUtil.getScreenHeight(mContext);
}
switch (widthMode) {
case View.MeasureSpec.EXACTLY:
width = widthSize;
case View.MeasureSpec.AT_MOST:
case View.MeasureSpec.UNSPECIFIED:
}
switch (heightMode) {
case View.MeasureSpec.EXACTLY:
height = heightSize;
case View.MeasureSpec.AT_MOST:
case View.MeasureSpec.UNSPECIFIED:
}
setMeasuredDimension(width, height);
}
/**
* 冒泡排序返回数组最大值
*
* @param unsorted
* @return
*/
private int sort(int[] unsorted) {
for (int i = 0; i < unsorted.length; i++) {
for (int j = i; j < unsorted.length; j++) {
if (unsorted[i] < unsorted[j]) {
int temp = unsorted[i];
unsorted[i] = unsorted[j];
unsorted[j] = temp;
}
}
}
return unsorted[0];
}
/**
* 将传入的item高度值赋给当前数组中最小的元素
*
* @param singleViewHeight 传入的item高度
*/
private void calculatorStaggeredHeight(int singleViewHeight) {
int index = 0;
int minValue = mHeightArray[0];
for (int i = 1; i < mHeightArray.length; i++) {
if (minValue > mHeightArray[i]) {
minValue = mHeightArray[i];
index = i;
}
}
mHeightArray[index] += singleViewHeight;
}
private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
int heightSpec, int[] measuredDimension) {
if (position < getItemCount()) {
try {
View view = recycler.getViewForPosition(position);//fix 动态添加时报IndexOutOfBoundsException
if (view != null) {
RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec,
getPaddingLeft() + getPaddingRight(), p.width);
int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,
getPaddingTop() + getPaddingBottom(), p.height);
view.measure(childWidthSpec, childHeightSpec);
measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;
measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;
KLog.v("p.height", p.height + "");
KLog.v("measuredDimension[1]", measuredDimension[1] + "");
recycler.recycleView(view);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}