Android RecyclerView曝光采集的实现方法
作者:最萌小熊猫
本文实例为大家分享了Android RecyclerView曝光采集的具体代码,供大家参考,具体内容如下
一、背景
近期pm提出需要统计首页商品的曝光亮,由于我们的首页是用的recylerview实现的,这里就来讲下如何使用监听recylerview的滚动事件来实现子view的曝光量统计,我们这里说的view都是列表中的子item条目(子view)
二、监听recylerview的滚动事件OnScrollListener
onScrollStateChanged:监听滚动状态
onScrolled:监听滚动
我们接下来的统计工作,就是拿这两个方法做文章。
//检测recylerview的滚动事件 recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() { @Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { /* 我这里通过的是停止滚动后屏幕上可见view。如果滚动过程中的可见view也要统计,你可以根据newState去做区分 SCROLL_STATE_IDLE:停止滚动 SCROLL_STATE_DRAGGING: 用户慢慢拖动 SCROLL_STATE_SETTLING:惯性滚动 */ if (newState == RecyclerView.SCROLL_STATE_IDLE) { ..... } } @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { super.onScrolled(recyclerView, dx, dy); ........ } });
首先再次明确下,我们要统计的是用户停止滑动时,显示在屏幕的上控件。所以我们要监测到onScrollStateChanged 方法中
newState == RecyclerView.SCROLL_STATE_IDLE 时,也就是用户停止滚动。然后在这里做文章
三、获取屏幕内可见条目的起始位置
这里的起始位置就是指我们屏幕当中最上面和最下面条目的位置。比如下图的0就是最上面的可见条目,3就是最下面的可见条目。我们次数的曝光view就是0,1,2,3 这个时候这四个条目显示在屏幕中。我们这时就要对这4个view的曝光量进行加1
那么接下来的重点就是要去获取屏幕内可见条目的起始位置。获取到起始位置后,当前屏幕里的可见条目就都能拿到了。
而recylerview的manager正好给我们提供的有对应的方法。
findFirstVisibleItemPosition()和findLastVisibleItemPosition() 看字面意思就能知道这时干嘛用的。
但是我们的manager不止LinearLayoutManager一种,所以我们要做下区分
//这里我们用一个数组来记录起始位置 int[] range = new int[2]; RecyclerView.LayoutManager manager = reView.getLayoutManager(); if (manager instanceof LinearLayoutManager) { range = findRangeLinear((LinearLayoutManager) manager); } else if (manager instanceof GridLayoutManager) { range = findRangeGrid((GridLayoutManager) manager); } else if (manager instanceof StaggeredGridLayoutManager) { range = findRangeStaggeredGrid((StaggeredGridLayoutManager) manager); }
LinearLayoutManager和GridLayoutManager获取起始位置方法如下
private int[] findRangeLinear(LinearLayoutManager manager) { int[] range = new int[2]; range[0] = manager.findFirstVisibleItemPosition(); range[1] = manager.findLastVisibleItemPosition(); return range; } private int[] findRangeGrid(GridLayoutManager manager) { int[] range = new int[2]; range[0] = manager.findFirstVisibleItemPosition(); range[1] = manager.findLastVisibleItemPosition(); return range; }
StaggeredGridLayoutManager获取起始位置有点复杂,如下
private int[] findRangeStaggeredGrid(StaggeredGridLayoutManager manager) { int[] startPos = new int[manager.getSpanCount()]; int[] endPos = new int[manager.getSpanCount()]; manager.findFirstVisibleItemPositions(startPos); manager.findLastVisibleItemPositions(endPos); int[] range = findRange(startPos, endPos); return range; } private int[] findRange(int[] startPos, int[] endPos) { int start = startPos[0]; int end = endPos[0]; for (int i = 1; i < startPos.length; i++) { if (start > startPos[i]) { start = startPos[i]; } } for (int i = 1; i < endPos.length; i++) { if (end < endPos[i]) { end = endPos[i]; } } int[] res = new int[]{start, end}; return res; }
四、获取到起始位置以后,我们就根据位置获取到view及view中的数据
上面第三步拿到屏幕内可见条目的起始位置以后,我们就用一个for循环,获取当前屏幕内可见的所有子view
for (int i = range[0]; i <= range[1]; i++) { View view = manager.findViewByPosition(i); recordViewCount(view); }
recordViewCount是我自己写的用于获取子view内绑定数据的方法
//获取view绑定的数据 private void recordViewCount(View view) { if (view == null || view.getVisibility() != View.VISIBLE || !view.isShown() || !view.getGlobalVisibleRect(new Rect())) { return; } int top = view.getTop(); int halfHeight = view.getHeight() / 2; int screenHeight = UiUtils.getScreenHeight((Activity) view.getContext()); int statusBarHeight = UiUtils.getStatusBarHeight(view.getContext()); if (top < 0 && Math.abs(top) > halfHeight) { return; } if (top > screenHeight - halfHeight - statusBarHeight) { return; } //这里获取的是我们view绑定的数据,相应的你要去在你的view里setTag,只有set了,才能get ItemData tag = (ItemData) view.getTag(); String key = tag.toString(); if (TextUtils.isEmpty(key)) { return; } hashMap.put(key, !hashMap.containsKey(key) ? 1 : (hashMap.get(key) + 1)); Log.i("qcl0402", key + "----出现次数:" + hashMap.get(key)); }
这里有几点需要注意
这这里起始位置的view显示区域如果不超过50%,就不算这个view可见,进而也就不统计曝光。
我们通过view.getTag();获取view里的数据,必须在此之前setTag()数据,我这里setTag是在viewholder中把数据set进去的
到这里我们就实现了recylerview列表中view控件曝光量的统计了。下面贴出来完整的代码给大家
package com.example.qcl.demo.xuexi.baoguang; import android.app.Activity; import android.graphics.Rect; import android.support.v7.widget.GridLayoutManager; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.StaggeredGridLayoutManager; import android.text.TextUtils; import android.util.Log; import android.view.View; import com.example.qcl.demo.utils.UiUtils; import java.util.concurrent.ConcurrentHashMap; /** * 2019/4/2 13:31 * author: qcl * desc: 安卓曝光量统计工具类 * wechat:2501902696 */ public class ViewShowCountUtils { //刚进入列表时统计当前屏幕可见views private boolean isFirstVisible = true; //用于统计曝光量的map private ConcurrentHashMap<String, Integer> hashMap = new ConcurrentHashMap<String, Integer>(); /* * 统计RecyclerView里当前屏幕可见子view的曝光量 * * */ void recordViewShowCount(RecyclerView recyclerView) { hashMap.clear(); if (recyclerView == null || recyclerView.getVisibility() != View.VISIBLE) { return; } //检测recylerview的滚动事件 recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() { @Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { /* 我这里通过的是停止滚动后屏幕上可见view。如果滚动过程中的可见view也要统计,你可以根据newState去做区分 SCROLL_STATE_IDLE:停止滚动 SCROLL_STATE_DRAGGING: 用户慢慢拖动 SCROLL_STATE_SETTLING:惯性滚动 */ if (newState == RecyclerView.SCROLL_STATE_IDLE) { getVisibleViews(recyclerView); } } @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { super.onScrolled(recyclerView, dx, dy); //刚进入列表时统计当前屏幕可见views if (isFirstVisible) { getVisibleViews(recyclerView); isFirstVisible = false; } } }); } /* * 获取当前屏幕上可见的view * */ private void getVisibleViews(RecyclerView reView) { if (reView == null || reView.getVisibility() != View.VISIBLE || !reView.isShown() || !reView.getGlobalVisibleRect(new Rect())) { return; } //保险起见,为了不让统计影响正常业务,这里做下try-catch try { int[] range = new int[2]; RecyclerView.LayoutManager manager = reView.getLayoutManager(); if (manager instanceof LinearLayoutManager) { range = findRangeLinear((LinearLayoutManager) manager); } else if (manager instanceof GridLayoutManager) { range = findRangeGrid((GridLayoutManager) manager); } else if (manager instanceof StaggeredGridLayoutManager) { range = findRangeStaggeredGrid((StaggeredGridLayoutManager) manager); } if (range == null || range.length < 2) { return; } Log.i("qcl0402", "屏幕内可见条目的起始位置:" + range[0] + "---" + range[1]); for (int i = range[0]; i <= range[1]; i++) { View view = manager.findViewByPosition(i); recordViewCount(view); } } catch (Exception e) { e.printStackTrace(); } } //获取view绑定的数据 private void recordViewCount(View view) { if (view == null || view.getVisibility() != View.VISIBLE || !view.isShown() || !view.getGlobalVisibleRect(new Rect())) { return; } int top = view.getTop(); int halfHeight = view.getHeight() / 2; int screenHeight = UiUtils.getScreenHeight((Activity) view.getContext()); int statusBarHeight = UiUtils.getStatusBarHeight(view.getContext()); if (top < 0 && Math.abs(top) > halfHeight) { return; } if (top > screenHeight - halfHeight - statusBarHeight) { return; } //这里获取的是我们view绑定的数据,相应的你要去在你的view里setTag,只有set了,才能get ItemData tag = (ItemData) view.getTag(); String key = tag.toString(); if (TextUtils.isEmpty(key)) { return; } hashMap.put(key, !hashMap.containsKey(key) ? 1 : (hashMap.get(key) + 1)); Log.i("qcl0402", key + "----出现次数:" + hashMap.get(key)); } private int[] findRangeLinear(LinearLayoutManager manager) { int[] range = new int[2]; range[0] = manager.findFirstVisibleItemPosition(); range[1] = manager.findLastVisibleItemPosition(); return range; } private int[] findRangeGrid(GridLayoutManager manager) { int[] range = new int[2]; range[0] = manager.findFirstVisibleItemPosition(); range[1] = manager.findLastVisibleItemPosition(); return range; } private int[] findRangeStaggeredGrid(StaggeredGridLayoutManager manager) { int[] startPos = new int[manager.getSpanCount()]; int[] endPos = new int[manager.getSpanCount()]; manager.findFirstVisibleItemPositions(startPos); manager.findLastVisibleItemPositions(endPos); int[] range = findRange(startPos, endPos); return range; } private int[] findRange(int[] startPos, int[] endPos) { int start = startPos[0]; int end = endPos[0]; for (int i = 1; i < startPos.length; i++) { if (start > startPos[i]) { start = startPos[i]; } } for (int i = 1; i < endPos.length; i++) { if (end < endPos[i]) { end = endPos[i]; } } int[] res = new int[]{start, end}; return res; } }
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。