RecyclerView載入多型別item 實現淘寶首頁佈局
阿新 • • 發佈：2018-12-14
主要為大家介紹如何用RecycleView來實現淘寶首頁複雜的佈局，做電商類app的小夥伴們可以略作參考。
首先上效果圖：
下面說一下實現方式，主要思路就是根據不同的資料型別去制定不同的item型別，然後動態地去設定這些item的寬高，設定item的型別相信大家都會，我這裡就不做闡述了，主要是說一下給不同型別的item設定不同的寬度。
首先，我們給RecyclerView設定一個列數為x的GridLayoutManager，然後再動態地為不同型別的item分別設定SpanSize。比如GridLayoutManager列數為4，item的SpanSize也為4，那麼這個item的寬度就是RecyclerView寬度的100%，最終的效果就跟列表一樣。同理，item的SpanSize如果是2，那麼就佔一行的一半寬度，item的SpanSize是1，佔1/4寬度…
比如我在demo裡面是把列數設為12：
HomeAdapter adapter = new HomeAdapter(this);
GridLayoutManager layoutManger = new GridLayoutManager(this, 12);
rcHome.setLayoutManager(layoutManger);
rcHome.setAdapter(adapter);- 1
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然後在adapter裡面重寫onAttachedToRecyclerView方法，為不同的ItemViewType設定不同的SpanSize：
@Override public void onAttachedToRecyclerView(RecyclerView recyclerView) { super.onAttachedToRecyclerView(recyclerView); RecyclerView.LayoutManager manager = recyclerView.getLayoutManager(); if (manager instanceof GridLayoutManager) { final GridLayoutManager gridManager = ((GridLayoutManager) manager); gridManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() { @Override public int getSpanSize(int position) { int type = getItemViewType(position); switch (type) { case BANNER: return 12; case COLUMN: return 3; case MARQUEE: return 12; case NUM_TWO: return 6; case TITLE: return 12; case NUM_THREE: return 4; case NORMAL: return 6; default: return 12; } } }); } }
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12代表寬度佔滿全屏，3代表佔螢幕的1/4，6代表佔螢幕的1/2等等，最終就可以實現上圖中的效果。
程式碼不多，就直接貼在下面了：
MainActivity
public class MainActivity extends AppCompatActivity { private Unbinder mUnBinder; @BindView(R.id.rc_home) RecyclerView rcHome; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mUnBinder = ButterKnife.bind(this); initView(); } private void initView() { HomeAdapter adapter = new HomeAdapter(this); GridLayoutManager layoutManger = new GridLayoutManager(this, 12); rcHome.setLayoutManager(layoutManger); rcHome.setAdapter(adapter); } @Override protected void onDestroy() { super.onDestroy(); mUnBinder.unbind(); } }
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HomeAdapter
public class HomeAdapter extends RecyclerView.Adapter {
private LayoutInflater inflater;
private List<Integer> imgList;
private List<String> marqueeList;
private static final int BANNER = 0;
private static final int COLUMN = 1;
private static final int MARQUEE = 2;
private static final int NUM_TWO = 3;
private static final int TITLE = 4;
private static final int NUM_THREE = 5;
private static final int NORMAL = 6;
public HomeAdapter(Context mContext) {
inflater = LayoutInflater.from(mContext);
//新增輪播資料
addBannerData();
//新增跑馬燈資料
addMarqueeData();
}
@Override
public int getItemCount() {
return 25;
}
@Override
public int getItemViewType(int position) {
if (position == 0) {
return BANNER;
} else if (position >= 1 && position <= 8) {
return COLUMN;
} else if (position == 9) {
return MARQUEE;
} else if (position >= 10 && position <= 13) {
return NUM_TWO;
} else if (position == 14 || position == 18) {
return TITLE;
} else if (position >= 15 && position <= 17) {
return NUM_THREE;
} else if (position >= 19 && position <= 24) {
return NORMAL;
}
return super.getItemViewType(position);
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
switch (viewType) {
case BANNER:
View itemBanner = inflater.inflate(R.layout.item_banner, parent, false);
return new BannerHolder(itemBanner);
case COLUMN:
View itemColumn = inflater.inflate(R.layout.item_column, parent, false);
return new ColumnHolder(itemColumn);
case MARQUEE:
View itemMarquee = inflater.inflate(R.layout.item_marquee, parent, false);
return new MarqueeHolder(itemMarquee);
case NUM_TWO:
View itemNumTwo = inflater.inflate(R.layout.item_num_two, parent, false);
return new NumTwoHolder(itemNumTwo);
case TITLE:
View itemTitle = inflater.inflate(R.layout.item_title, parent, false);
return new TitleHolder(itemTitle);
case NUM_THREE:
View itemNumThree = inflater.inflate(R.layout.item_num_three, parent, false);
return new NumThreeHolder(itemNumThree);
case NORMAL:
View itemNormal = inflater.inflate(R.layout.item_normal, parent, false);
return new NormalHolder(itemNormal);
default:
return null;
}
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (holder instanceof BannerHolder) {
setBanner((BannerHolder) holder);
} else if (holder instanceof ColumnHolder) {
} else if (holder instanceof MarqueeHolder && marqueeList != null) {
setMarquee((MarqueeHolder) holder);
} else if (holder instanceof NumTwoHolder) {
} else if (holder instanceof TitleHolder) {
setTitle((TitleHolder) holder, position);
} else if (holder instanceof NumThreeHolder) {
} else if (holder instanceof NormalHolder) {
}
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
if (manager instanceof GridLayoutManager) {
final GridLayoutManager gridManager = ((GridLayoutManager) manager);
gridManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
@Override
public int getSpanSize(int position) {
int type = getItemViewType(position);
switch (type) {
case BANNER:
return 12;
case COLUMN:
return 3;
case MARQUEE:
return 12;
case NUM_TWO:
return 6;
case TITLE:
return 12;
case NUM_THREE:
return 4;
case NORMAL:
return 6;
default:
return 12;
}
}
});
}
}
public class BannerHolder extends RecyclerView.ViewHolder {
@BindView(R.id.banner)
Banner banner;
BannerHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
public class ColumnHolder extends RecyclerView.ViewHolder {
public ColumnHolder(View itemView) {
super(itemView);
}
}
public class MarqueeHolder extends RecyclerView.ViewHolder {
@BindView(R.id.marquee)
UPMarqueeView marquee;
public MarqueeHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
public class NumTwoHolder extends RecyclerView.ViewHolder {
public NumTwoHolder(View itemView) {
super(itemView);
}
}
public class TitleHolder extends RecyclerView.ViewHolder {
@BindView(R.id.tv_title)
TextView tvTitle;
public TitleHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
public class NumThreeHolder extends RecyclerView.ViewHolder {
public NumThreeHolder(View itemView) {
super(itemView);
}
}
public class NormalHolder extends RecyclerView.ViewHolder {
public NormalHolder(View itemView) {
super(itemView);
}
}
/**
* 輪播圖圖片列表
*/
private void addBannerData() {
imgList = new ArrayList<>();
imgList.add(R.drawable.home_pic);
imgList.add(R.drawable.home_pic);
imgList.add(R.drawable.home_pic);
}
/**
* 新增跑馬燈資料
*/
private void addMarqueeData() {
marqueeList = new ArrayList<>();
marqueeList.add("太瘋狂！IPhone X首批1分鐘賣光。");
marqueeList.add("家人給2歲孩子喝這個，孩子智力倒退10歲!");
marqueeList.add("自助餐裡面的潛規則，想要吃回本其實很簡單。");
marqueeList.add("簡直是白菜價！日本玩家33萬甩賣15萬張遊戲王卡。");
}
/**
* 繫結輪播圖資料
*/
private void setBanner(BannerHolder holder) {
holder.banner.setBannerStyle(BannerConfig.NUM_INDICATOR);
holder.banner.setImageLoader(new GlideImageLoader());
holder.banner.setImages(imgList);
holder.banner.setBannerAnimation(Transformer.Default);
holder.banner.isAutoPlay(true);
holder.banner.setDelayTime(3000);
holder.banner.setIndicatorGravity(BannerConfig.CENTER);
holder.banner.start();
}
/**
* 設定跑馬燈
*/
private void setMarquee(MarqueeHolder holder) {
List<View> views = new ArrayList<>();
for (int i = 0; i < marqueeList.size(); i = i + 2) {
LinearLayout view = (LinearLayout) inflater.inflate(R.layout.marquee_text, null);
TextView textTop = (TextView) view.findViewById(R.id.text_top);
TextView textBottom = (TextView) view.findViewById(R.id.text_bottom);
textTop.setText(marqueeList.get(i));
if (marqueeList.size() > i + 1) {
textBottom.setText(marqueeList.get(i + 1));
}
views.add(view);
}
holder.marquee.setViews(views);
}
/**
* 模組標題
*/
private void setTitle(TitleHolder holder, int position) {
switch (position) {
case 14:
holder.tvTitle.setText("精品推薦");
break;
case 18:
holder.tvTitle.setText("猜你喜歡");
break;
}
}
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--------------------- 本文來自 卡藍_ 的CSDN 部落格 ，全文地址請點選：https://blog.csdn.net/a466302603/article/details/78411612?utm_source=copy