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-白红宇

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

阅读量：6844 次

发布时间：2019-06-26

本文共 5244 字，大约阅读时间需要 17 分钟。

代码地址如下：
http://www.demodashi.com/demo/11271.html

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

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
    
      getData() {            List
     
       demoEntities = new ArrayList<>();            for (int i = images.length; i > 0; i--) {//9                List
      
        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
    
      {        private List
     
       mDemoEntities;        private Context mContext;            public ListAdapter(Context mContext, List
      
        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);            }        }    }