Android RecylerView完美实现瀑布流 图片高度自适应 滑动很丝滑( 小红书效果)

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);

ListnewsList=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




demo地址:https://github.com/pengcaihua123456/shennandadao

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