一个可变布局列表，有9种布局item大小，每个item可拖拽切换位置

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发布时间：2017-08-30

3人 | 浏览：3303次 | 收藏 |

技术：Android 4.4 + jdk 1.8

运行环境：Android 4.4

概述

一个可变布局列表，有9种布局item大小，每个item可拖拽切换位置

详细

### 一、准备工作
- 准备一台安卓设备手机，4.4以上版本
- 本例子实现，一个可变布局列表，有9种布局item大小，每个item可拖拽切换位置

### 二、程序实现
- 项目结构截图![](/contentImages/image/20170820/c1IB7HIF68OGs5pGI3N.png)
- 主界面列表程序
```
    public class DragListActivity extends AppCompatActivity {
        private RecyclerView mRecyclerView;
        private ListAdapter mListAdapter;
    
        @Override
        protected void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_list);
            initView();
        }
    
        private void initView() {
            mRecyclerView = (RecyclerView) findViewById(R.id.rv_list);
            mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
            mListAdapter = new ListAdapter(this, getData());
            mRecyclerView.setAdapter(mListAdapter);
        }
    
        private List<DemoEntity> getData() {
            List<DemoEntity> demoEntities = new ArrayList<>();
            for (int i = images.length; i > 0; i--) {//9
                List<String> picStrings = new ArrayList<>();
                for (int j = 0; j < i; j++) {
                    picStrings.add(images[j]);
                }
                demoEntities.add(new DemoEntity(picStrings));
            }
            return demoEntities;
        }
    
        private String[] images = new String[]{
                "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1498024420832&di=5aa012750e828d3ef0c3f789a36e2347&imgtype=0&src=http%3A%2F%2Fimage.tianjimedia.com%2FuploadImages%2F2015%2F204%2F30%2F5ED1I1R45I1R.jpg",
                "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1498024420832&di=7a5226ba75156eb2d270e7b79bdb3707&imgtype=0&src=http%3A%2F%2Fimage.tianjimedia.com%2FuploadImages%2F2015%2F204%2F26%2F71H003OBEC6I.jpg",
                "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1498024420831&di=78e6711286a797838ba659d3ffb71b50&imgtype=0&src=http%3A%2F%2Fimage.tianjimedia.com%2FuploadImages%2F2015%2F204%2F25%2FWC9015475YJ9.jpg",
                "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1498024421112&di=ca179c35d92159b0f3d692f334b1021d&imgtype=0&src=http%3A%2F%2Fimg.tupianzj.com%2Fuploads%2Fallimg%2F140506%2F1-140506160101.jpg",
                "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1498024421112&di=3522c0c7f522369c0840012bc3886fa4&imgtype=0&src=http%3A%2F%2Fimg.tupianzj.com%2Fuploads%2Fallimg%2F140506%2F1-140506160102-50.jpg",
                "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1498024421111&di=83f6400e4644b91db81047e4b67be8d4&imgtype=0&src=http%3A%2F%2Fimg.tupianzj.com%2Fuploads%2Fallimg%2F140506%2F1-140506160120-50.jpg",
                "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1498024421111&di=216984c5a5163891965c499cb020322a&imgtype=0&src=http%3A%2F%2Fimg.tupianzj.com%2Fuploads%2Fallimg%2F140506%2F1-140506160126-50.jpg",
                "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1498024421110&di=0cd844d61e951abe5249aa9c660d37c5&imgtype=0&src=http%3A%2F%2Fimg.tupianzj.com%2Fuploads%2Fallimg%2F140506%2F1-140506160135.jpg",
                "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1498024421108&di=86bf19c2d8d47beaf5cad6797c4da4eb&imgtype=0&src=http%3A%2F%2Fimg.tupianzj.com%2Fuploads%2Fallimg%2F140506%2F1-140506160300.jpg",
        };
    
    }
```
- 适配器代码
```
    public class ListAdapter extends RecyclerView.Adapter<ListAdapter.ViewHolder> {
        private List<DemoEntity> mDemoEntities;
        private Context mContext;
    
        public ListAdapter(Context mContext, List<DemoEntity> demoEntities) {
            this.mContext = mContext;
            mDemoEntities = demoEntities;
        }
    
        @Override
        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View v = LayoutInflater.from(mContext).inflate(R.layout.item_view, parent, false);
            ViewHolder viewHolder = new ViewHolder(v);
            return viewHolder;
        }
    
        @Override
        public void onBindViewHolder(ViewHolder holder, int position) {
            //设置是否可以拖拽，必须执行在bindData之前
            holder.mImageNice9Layout.setCanDrag(true);
            holder.mImageNice9Layout.bindData(mDemoEntities.get(position).pictures);//入参：集合
            //位置item点击事件
            holder.mImageNice9Layout.setItemDelegate(new ImageNice9Layout.ItemDelegate() {
                @Override
                public void onItemClick(int position) {
                    Toast.makeText(mContext, "位置" + position, Toast.LENGTH_SHORT).show();
                }
            });
        }
    
        @Override
        public int getItemCount() {
            return mDemoEntities.size();
        }
    
        class ViewHolder extends RecyclerView.ViewHolder {
            ImageNice9Layout mImageNice9Layout;
    
            public ViewHolder(View itemView) {
                super(itemView);
                mImageNice9Layout = (ImageNice9Layout) itemView.findViewById(R.id.item_nice9_image);
            }
        }
    }
```
- 其他代码都在依赖库，具体下载demo查阅

### 三、运行效果
- ![](http://hwc-yunce.oss-cn-shanghai.aliyuncs.com/gaollg8.GIF)

### 四、其他补充
- 欢迎浏览作者简书博客：[http://www.jianshu.com/u/28a4d1accff3](http://www.jianshu.com/u/28a4d1accff3)

本实例支付的费用只是购买源码的费用，如有疑问欢迎在文末留言交流，如需作者在线代码指导、定制等，在作者开启付费服务后，可以点击“购买服务”进行实时联系，请知悉，谢谢

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一个可变布局列表，有9种布局item大小，每个item可拖拽切换位置

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