乞丐版MVP之展示列表

列表视图 Data是最里面的展示数据
我的Bean类有两个方法Root是外面的，Data是里面的核心展示列表数据

public interface ListDataView {
    void onSuccess(List<Data> result);
    void onFailer(String msg);
}

列表模型 Root是最外面的验证

public class ListDataModel {
    public static Root getListData() {
        String data = Utils.get("http://www.xieast.com/api/news/news.php");
        Gson gson = new Gson();
        Root root = gson.fromJson(data, Root.class);
        return root;
    }
}

列表Persenter

public class ListDataPersenter {
    private ListDataView listDataView;

    public ListDataPersenter(ListDataView listDataView) {
        this.listDataView = listDataView;
    }

    public void getListData() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                Root data = ListDataModel.getListData();
                Message message = Message.obtain();
                message.obj = data;
                handler.sendMessage(message);
            }
        }).start();
    }

    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            Root data = (Root) msg.obj;
            listDataView.onSuccess(data.getData());
        }
    };
}

相当于Activity 一定要implements ListDataView的两个方法

public class HomePage extends Fragment implements ListDataView {
    private View view;
    private ListView mListview;
    private ListDataPersenter persenter;
    private List<Data> mList;
    private MyAdapter adapter;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = View.inflate(getActivity(), R.layout.fragment_homepage, null);
        initView(view);
        return view;
    }

    private void initView(View view) {
        mListview = (ListView) view.findViewById(R.id.listview);
        mList = new ArrayList<>();
        persenter = new ListDataPersenter(this);
        persenter.getListData();
        adapter = new MyAdapter(mList,getActivity());
        mListview.setAdapter(adapter);
    }

    @Override
    public void onSuccess(List<Data> result) {
        if (result!=null) {
            mList.clear();
            mList.addAll(result);
            adapter.notifyDataSetChanged();
        }
    }

    @Override
    public void onFailer(String msg) {
        Toast.makeText(getActivity(),msg,Toast.LENGTH_SHORT).show();
    }
}

适配器

public class MyAdapter extends BaseAdapter {
    private List<Data> mList;
    private Context context;

    public MyAdapter(List<Data> mList, Context context) {
        this.mList = mList;
        this.context = context;
    }

    @Override
    public int getCount() {
        return mList.size();
    }

    @Override
    public Object getItem(int i) {
        return mList.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        ViewHolder viewHolder;
        if (view==null) {
            viewHolder = new ViewHolder();
            view = View.inflate(context,R.layout.item_goods,null);
            viewHolder.title = view.findViewById(R.id.text_title);
            viewHolder.image = view.findViewById(R.id.image);
            viewHolder.image1 = view.findViewById(R.id.image1);
            viewHolder.image2 = view.findViewById(R.id.image2);
            view.setTag(viewHolder);
        }else {
            viewHolder = (ViewHolder) view.getTag();
        }
        viewHolder.title.setText(mList.get(i).getTitle());
        Picasso.with(context).load(mList.get(i).getThumbnail_pic_s()).into(viewHolder.image);
        Picasso.with(context).load(mList.get(i).getThumbnail_pic_s02()).into(viewHolder.image1);
        Picasso.with(context).load(mList.get(i).getThumbnail_pic_s03()).into(viewHolder.image2);
        return view;
    }

    class ViewHolder {
        public TextView title;
        public ImageView image;
        public ImageView image1;
        public ImageView image2;
    }
}