网上很多博客写的有问题，比如：闪烁，留白，错位。高度无法自适应。5分钟教会你。
今天开始讲RecycleView的系列教程。分割线，分组，局部刷新，动态添加，缓存原理，抖音效果，瀑布流。嵌套，动画等等
今天主要讲解如何使用StaggeredGridLayoutManager来实现瀑布流
瀑布流效果，RecyclerView设置的layoutManager必须是StaggeredGridLayoutManager
瀑布流支持功能
1.控制每行个数，gridlayoutmanager，瀑布流没有
2.瀑布流多类型，瀑布流和其他类型占用一行混合
3.高度自适应，等宽不等高 ,高度自适应:要用图片glide才行
4.分割线问题:DividerGridItemDecoration
5.上拉加载数据
6.下拉刷新
7.点赞和关注:数据更新，但是刷新只刷新单个
自适应高度：
1.通过glide加载
Glide.with(context).load(articleFeed.getImages().get(0)).placeholder(R.mipmap.default_por_hold).into(iv_item);
2.图片的方式
android:id="@+id/iv_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="@mipmap/default_por_hold"
android:visibility="visible"
android:adjustViewBounds="true"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
3.多类型是否占用一行
@Override
public void onViewAttachedToWindow(BaseViewHolder holder) {
super.onViewAttachedToWindow(holder);
if(holder==null){
return;
}
int type = holder.getItemViewType();
if (type !=HomePageMultipleCard.HOMEPAGE_MULTIPLE_CARD_TYPE_FITNESS_FEED) {
ViewGroup.LayoutParams lp = holder.itemView.getLayoutParams();
if (lpinstanceof StaggeredGridLayoutManager.LayoutParams) {
StaggeredGridLayoutManager.LayoutParams p =
(StaggeredGridLayoutManager.LayoutParams) lp;
p.setFullSpan(true);
}
}
}
4. 每行的个数
@Override
protected RecyclerView.LayoutManager getLayoutManger(Context context) {
return new FastStaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
}
源代码：
publicclassMainActivityextendsAppCompatActivity{
@Override
protectedvoidonCreate(BundlesavedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
List<News>newsList=newArrayList();
newsList.add(newNews("新闻标题1",R.drawable.img01));
newsList.add(newNews("新闻标题2",R.drawable.img02));
newsList.add(newNews("新闻标题3",R.drawable.img01));
newsList.add(newNews("新闻标题4",R.drawable.img02));
newsList.add(newNews("新闻标题5",R.drawable.img01));
newsList.add(newNews("新闻标题6",R.drawable.img02));
newsList.add(newNews("新闻标题7",R.drawable.img01));
newsList.add(newNews("新闻标题8",R.drawable.img02));
newsList.add(newNews("新闻标题9",R.drawable.img01));
newsList.add(newNews("新闻标题10",R.drawable.img02));
NewsAdapternewsAdapter=newNewsAdapter(newsList);
RecyclerViewview=findViewById(R.id.list1);
StaggeredGridLayoutManagerlayoutManager=newStaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL);
view.setLayoutManager(layoutManager);
view.setAdapter(newsAdapter);
}
publicclassHomePageCardFitnessFeed{
publicstaticfinalStringFROM_TYPE="feed_ai";
privateContextcontext;
publicvoidbindView(finalContextcontext,BaseViewHolderhelper,
finalHomePageMultipleCarditem) {
articleFeed=item.articleFeed;
this.context=context;
if(articleFeed==null) {
return;
}
if(!EventBus.getDefault().isRegistered(this)) {
EventBus.getDefault().register(this);
}
ImageViewiv_item=helper.getView(R.id.iv_icon);
iv_item.setOnClickListener(newView.OnClickListener() {
@Override
publicvoidonClick(Viewv) {
ActivityPostDetail.openActivity((ActivitySportBase)context, (int)articleFeed.getTopic_id(),FROM_TYPE,articleFeed);
FeedReport.reportFeedTopicId(FeedReport.kclickFeedEventId,articleFeed.getTopic_id());
}
});
if(articleFeed.getImages()!=null&&articleFeed.getImages().size()>0) {
Glide.with(context).load(articleFeed.getImages().get(0)).placeholder(R.mipmap.default_por_hold).into(iv_item);
}
@Override
publicvoidonViewAttachedToWindow(BaseViewHolderholder) {
super.onViewAttachedToWindow(holder);
if(holder==null){
return;
}
inttype=holder.getItemViewType();
if(type!=HomePageMultipleCard.HOMEPAGE_MULTIPLE_CARD_TYPE_FITNESS_FEED) {
ViewGroup.LayoutParamslp=holder.itemView.getLayoutParams();
if(lpinstanceofStaggeredGridLayoutManager.LayoutParams) {
StaggeredGridLayoutManager.LayoutParamsp=
(StaggeredGridLayoutManager.LayoutParams)lp;
p.setFullSpan(true);
}
}
}
@Override
protectedvoidconvert(BaseViewHolderhelper,HomePageMultipleCarditem) {
item.setSportMode(sportMode);
switch(item.itemType) {
caseHomePageMultipleCard.HOMEPAGE_MULTIPLE_CARD_TYPE_AD:
bindADView(helper,item);
@Override
protectedRecyclerView.LayoutManagergetLayoutManger(Contextcontext) {
returnnewFastStaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL);
}
@Override
protectedbooleanneedAddFootView() {
returnfalse;
}
@Override
protectedbooleanneedDecoration() {
returntrue;
}
@Override
protectedbooleanneedLoadMore() {
returntrue;
}
@Override
protectedvoidinitData(@NullableBundlesavedInstanceState) {
initPresenter();
网上用的方案：错误的
动态给控件设置宽和高的办法：但是没有必要的。不够智能
ConstraintLayout.LayoutParams lp = (ConstraintLayout.LayoutParams) iv_item.getLayoutParams();
int
height = new Random().nextInt(10);
height = DensityUtil.dip2px(context, 330) + height * 30;
int
width=ScreenUtils.getScreenWidth(context) / 2;
lp.height = height;
lp.width = width;
YDLog.logDebeg("HomePageCardFitnessFeed","height:"+height+"width:"+width);
iv_item.setLayoutParams(lp);
首先分析GL，它是继承LineaLayoutManager的，也就是线性有的它都有
GridLayoutManager和StaggeredGridLayoutManager的区别
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