使用阿里VLayout实现类似淘宝主页面

代码地址：https://github.com/DaLeiGe/AndroidSamples/tree/master/VLayout
先上图

ezgif.com-video-to-gif.gif
VLayout是一个针对RecyclerView的LayoutManager扩展, 主要提供一整套布局方案和布局间的组件复用的问题。简单理解就是方便实现Recyclerview的item为各种列表的情况

VLayout支持如下布局方式

• LinearLayoutHelper: 线性布局
• GridLayoutHelper: Grid布局， 支持横向的colspan
• FixLayoutHelper: 固定布局，始终在屏幕固定位置显示
• ScrollFixLayoutHelper: 固定布局，但之后当页面滑动到该图片区域才显示, 可以用来做返回顶部或其他书签等
• FloatLayoutHelper: 浮动布局，可以固定显示在屏幕上，但用户可以拖拽其位置
• ColumnLayoutHelper: 栏格布局，都布局在一排，可以配置不同列之间的宽度比值
• SingleLayoutHelper: 通栏布局，只会显示一个组件View
• OnePlusNLayoutHelper: 一拖N布局，可以配置1-5个子元素
• StickyLayoutHelper: stikcy布局， 可以配置吸顶或者吸底
• StaggeredGridLayoutHelper: 瀑布流布局，可配置间隔高度/宽度

实现如上页面

1.三方库引入

 implementation 'com.android.support:recyclerview-v7:28.0.0'
    implementation 'com.alibaba.android:vlayout:1.0.3'
    implementation 'com.android.support:support-v4:28.0.0'
    //banner 轮播图
    implementation 'com.youth.banner:banner:1.4.9'
    //marqueeview 跑马灯
    implementation 'com.sunfusheng:marqueeview:1.3.1'
    //Glide图片加载框架
    implementation 'com.github.bumptech.glide:glide:3.7.0'

2.基类封装

操作RecyclerView时一般都会使用BaseViewHolder简化操作

import android.support.annotation.ColorInt;
import android.support.annotation.DrawableRes;
import android.support.annotation.IdRes;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.util.SparseArray;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

/**
 * Create by 陈扬齐
 * Create on 2019-07-06
 * description:基类ViewHolder封装
 */
public class BaseViewHolder extends RecyclerView.ViewHolder {
    private SparseArray<View> views;

    public BaseViewHolder(@NonNull View itemView) {
        super(itemView);
        this.views = new SparseArray<>();
    }

    public BaseViewHolder setTextColor(@IdRes int viewId, @ColorInt int textColor) {
        TextView view = getView(viewId);
        view.setTextColor(textColor);
        return this;
    }

    public BaseViewHolder setImageResource(@IdRes int viewId, @DrawableRes int imageResId) {
        ImageView view = getView(viewId);
        view.setImageResource(imageResId);
        return this;
    }

    public BaseViewHolder setText(@IdRes int viewId, CharSequence value) {
        TextView view = getView(viewId);
        view.setText(value);
        return this;
    }

    public <T extends View> T getView(@IdRes int viewId) {
        View view = views.get(viewId);
        if (view == null) {
            view = itemView.findViewById(viewId);
            views.put(viewId, view);
        }
        return (T) view;
    }
}

同样也封装VLayout的DelegeteAdapter，提取基类

import android.content.Context;
import android.support.annotation.NonNull;
import android.view.LayoutInflater;
import android.view.ViewGroup;

import com.alibaba.android.vlayout.DelegateAdapter;
import com.alibaba.android.vlayout.LayoutHelper;

/**
 * Create by 陈扬齐
 * Create on 2019-07-06
 * description:
 */
public class BaseDelegeteAdapter extends DelegateAdapter.Adapter<BaseViewHolder> {
    private LayoutHelper mLayoutHelper;
    private int mCount = -1;
    private int mLayoutId = -1;
    private Context mContext;
    private int mViewTypeItem = -1;

    public BaseDelegeteAdapter(Context context,
                               LayoutHelper layoutHelper,
                               int layoutId, int count) {
        this.mLayoutHelper = layoutHelper;
        this.mCount = count;
        this.mLayoutId = layoutId;
        this.mContext = context;
    }

    @Override
    public LayoutHelper onCreateLayoutHelper() {
        return mLayoutHelper;
    }

    @NonNull
    @Override
    public BaseViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) {
        return new BaseViewHolder(LayoutInflater.from(mContext).inflate(mLayoutId, viewGroup,
                false));
    }

    @Override
    public void onBindViewHolder(@NonNull BaseViewHolder baseViewHolder, int i) {

    }

    @Override
    public int getItemCount() {
        return mCount;
    }
}

3. 列表嵌套列表的实现

通过RecyclerView的Adapter.addAdapter(itemAdapter)的方式实现列表嵌套列表，具体代码如下

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.alibaba.android.vlayout.DelegateAdapter;
import com.alibaba.android.vlayout.VirtualLayoutManager;
import com.alibaba.android.vlayout.layout.GridLayoutHelper;
import com.alibaba.android.vlayout.layout.LinearLayoutHelper;
import com.bumptech.glide.Glide;
import com.sunfusheng.marqueeview.MarqueeView;
import com.youth.banner.Banner;
import com.youth.banner.BannerConfig;
import com.youth.banner.Transformer;
import com.youth.banner.listener.OnBannerListener;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private RecyclerView mRecyclerView;
    //应用
    String[] ITEM_NAMES = {"天猫", "聚划算", "天猫国际", "外卖", "天猫超市", "充值中心", "飞猪旅行", "领金币", "拍卖", "分类"};
    int[] IMG_URLS = {R.mipmap.ic_tian_mao, R.mipmap.ic_ju_hua_suan, R.mipmap.ic_tian_mao_guoji,
            R.mipmap.ic_waimai, R.mipmap.ic_chaoshi, R.mipmap.ic_voucher_center,
            R.mipmap.ic_travel, R.mipmap.ic_tao_gold, R.mipmap.ic_auction, R.mipmap.ic_classify};

    //    高颜值商品位
    int[] ITEM_URL = {R.mipmap.item1, R.mipmap.item2, R.mipmap.item3, R.mipmap.item4,
            R.mipmap.item5};
    int[] GRID_URL = {R.mipmap.flashsale1, R.mipmap.flashsale2, R.mipmap.flashsale3,
            R.mipmap.flashsale4};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }

    private void initView() {
        mRecyclerView = findViewById(R.id.recycler);
        VirtualLayoutManager virtualLayoutManager = new VirtualLayoutManager(this);
        mRecyclerView.setLayoutManager(virtualLayoutManager);
        RecyclerView.RecycledViewPool viewPool = new RecyclerView.RecycledViewPool();
        mRecyclerView.setRecycledViewPool(viewPool);
        viewPool.setMaxRecycledViews(0, 10);

        BaseDelegeteAdapter bannerAdapter = new BaseDelegeteAdapter(this,
                new LinearLayoutHelper(), R.layout.vlayout_banner, 1) {
            @Override
            public void onBindViewHolder(@NonNull BaseViewHolder baseViewHolder, int i) {
                ArrayList<String> arrayList = new ArrayList<>();
                arrayList.add("https://gw.alicdn.com/imgextra/i1/7/O1CN01nfNUEq1BvFJ6YLtPD_!!7-0" +
                        "-lubanu.jpg");
                arrayList.add("https://gw.alicdn.com/imgextra/i3/20/O1CN01UTTfyr1C1CSm4hzOv_!!20" +
                        "-0" +
                        "-lubanu.jpg");
                arrayList.add("https://gw.alicdn.com/imgextra/i3/106/O1CN01etvHvW1CeaWUFfTu9_" +
                        "!!106-0" +
                        "-lubanu.jpg");
                arrayList.add("https://gw.alicdn.com/imgextra/i3/20/O1CN01UTTfyr1C1CSm4hzOv_!!20" +
                        "-0" +
                        "-lubanu.jpg");
                arrayList.add("https://gw.alicdn.com/imgextra/i2/14/O1CN019L7VgZ1ByS5PJJpnO_!!14" +
                        "-0" +
                        "-lubanu.jpg");
                arrayList.add("https://img.alicdn.com/tps/i4/TB1YMbpeoKF3KVjSZFESutExFXa.jpg");
                // 绑定数据
                Banner mBanner = baseViewHolder.getView(R.id.banner);
                //设置banner样式
                mBanner.setBannerStyle(BannerConfig.CIRCLE_INDICATOR);
                //设置图片集合
                mBanner.setImages(arrayList);
                //设置banner动画效果
                mBanner.setBannerAnimation(Transformer.Default);
                //设置标题集合（当banner样式有显示title时）
                //        mBanner.setBannerTitles(titles);
                //设置自动轮播，默认为true
                mBanner.isAutoPlay(true);
                mBanner.setImageLoader(new GlideImageLoader());
                //设置轮播时间
                mBanner.setDelayTime(3000);
                //设置指示器位置（当banner模式中有指示器时）
                mBanner.setIndicatorGravity(BannerConfig.CENTER);
                //banner设置方法全部调用完毕时最后调用
                mBanner.start();

                mBanner.setOnBannerListener(new OnBannerListener() {
                    @Override
                    public void OnBannerClick(int position) {
                        Toast.makeText(getApplicationContext(), "banner点击了" + position,
                                Toast.LENGTH_SHORT).show();
                    }
                });
                super.onBindViewHolder(baseViewHolder, i);
            }
        };

        GridLayoutHelper gridLayoutHelper = new GridLayoutHelper(5);
        gridLayoutHelper.setPadding(0, 20, 0, 0);
        gridLayoutHelper.setVGap(20);//垂直间距
        gridLayoutHelper.setHGap(0);//水平间距
        BaseDelegeteAdapter menuAdapter = new BaseDelegeteAdapter(this, gridLayoutHelper,
                R.layout.vlayout_menu, 10) {
            @Override
            public void onBindViewHolder(@NonNull BaseViewHolder holder, final int position) {
                holder.setText(R.id.tv_menu_title_home, ITEM_NAMES[position] + "");
                holder.setImageResource(R.id.iv_menu_home, IMG_URLS[position]);
                holder.getView(R.id.ll_menu_home).setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        Toast.makeText(getApplicationContext(), ITEM_NAMES[position],
                                Toast.LENGTH_SHORT).show();
                    }
                });
                super.onBindViewHolder(holder, position);
            }
        };


        BaseDelegeteAdapter newsAdapter = new BaseDelegeteAdapter(this, new LinearLayoutHelper(),
                R.layout.vlayout_news, 1) {
            @Override
            public void onBindViewHolder(@NonNull BaseViewHolder holder, int i) {
                MarqueeView marqueeView1 = holder.getView(R.id.marqueeView1);
                MarqueeView marqueeView2 = holder.getView(R.id.marqueeView2);

                List<String> info1 = new ArrayList<>();
                info1.add("天猫超市最近发大活动啦，快来抢");
                info1.add("没有最便宜，只有更便宜！");

                List<String> info2 = new ArrayList<>();
                info2.add("这个是用来搞笑的，不要在意这写小细节！");
                info2.add("啦啦啦啦，我就是来搞笑的！");

                marqueeView1.startWithList(info1);
                marqueeView2.startWithList(info2);
                // 在代码里设置自己的动画
                marqueeView1.startWithList(info1, R.anim.anim_bottom_in, R.anim.anim_top_out);
                marqueeView2.startWithList(info2, R.anim.anim_bottom_in, R.anim.anim_top_out);

                marqueeView1.setOnItemClickListener(new MarqueeView.OnItemClickListener() {
                    @Override
                    public void onItemClick(int position, TextView textView) {
                        Toast.makeText(getApplicationContext(), textView.getText().toString(),
                                Toast.LENGTH_SHORT).show();
                    }
                });
                marqueeView2.setOnItemClickListener(new MarqueeView.OnItemClickListener() {
                    @Override
                    public void onItemClick(int position, TextView textView) {
                        Toast.makeText(getApplicationContext(), textView.getText().toString(),
                                Toast.LENGTH_SHORT).show();
                    }
                });
            }
        };

        DelegateAdapter delegateAdapter = new DelegateAdapter(virtualLayoutManager, true);
        delegateAdapter.addAdapter(bannerAdapter);
        delegateAdapter.addAdapter(menuAdapter);
        delegateAdapter.addAdapter(newsAdapter);


        for (int i = 0; i < ITEM_URL.length; i++) {
            final int finalI = i;
            BaseDelegeteAdapter titleAdapter = new BaseDelegeteAdapter(this,
                    new LinearLayoutHelper(), R.layout.vlayout_title, 1) {
                @Override
                public void onBindViewHolder(BaseViewHolder holder, int position) {
                    super.onBindViewHolder(holder, position);
                    Glide.with(getApplicationContext()).load(ITEM_URL[finalI])
                            .thumbnail(0.2f)
                            .into((ImageView) holder.getView(R.id.iv));
                }
            };
            GridLayoutHelper gridHelper = new GridLayoutHelper(2);
            BaseDelegeteAdapter gridAdapter = new BaseDelegeteAdapter(this, gridHelper,
                    R.layout.vlayout_grid, 4) {

                @Override
                public void onBindViewHolder(@NonNull BaseViewHolder holder, final int position) {
                    int item = GRID_URL[position];
                    ImageView iv = holder.getView(R.id.iv);
                    Glide.with(getApplicationContext()).load(item).thumbnail(0.2f).into(iv);

                    iv.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            Toast.makeText(getApplicationContext(), "item" + position,
                                    Toast.LENGTH_SHORT).show();
                        }
                    });
                }
            };
            delegateAdapter.addAdapter(titleAdapter);
            delegateAdapter.addAdapter(gridAdapter);
        }

        mRecyclerView.setAdapter(delegateAdapter);
    }
}

VLayout更多功能参考官方demohttps://github.com/alibaba/vlayout