RetroFitDemo小练习

MainActivity

public class MainActivity extends AppCompatActivity {

    private RecyclerView recyclerView;

    private List<Category> list;

    private CategoryAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclerView = (RecyclerView) findViewById(R.id.myrecycleview);

        list = new ArrayList<>();
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        adapter = new CategoryAdapter(this, list);
        recyclerView.setAdapter(adapter);


        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("https://www.zhaoapi.cn/")
                .addConverterFactory(GsonConverterFactory.create())
                .build();

        ApiSevice service = retrofit.create(ApiSevice.class);

        Call<MessageBean<List<Category>>> call = service.getCatagory();

        call.enqueue(new Callback<MessageBean<List<Category>>>() {
            @Override
            public void onResponse(Call<MessageBean<List<Category>>> call, Response<MessageBean<List<Category>>> response) {
                MessageBean<List<Category>> message = response.body();
                if (message.getData() != null) {
                    list.clear();
                    list.addAll(message.getData());
                    adapter.notifyDataSetChanged();
                }
            }
            @Override
            public void onFailure(Call<MessageBean<List<Category>>> call, Throwable t) {
                Toast.makeText(MainActivity.this, "网络请求失败，原因是："+t.getMessage(), Toast.LENGTH_SHORT).show();
            }
        });

    }
}

 

Api类
public interface ApiSevice {

    @GET("product/getCatagory")
    Call<MessageBean<List<Category>>> getCatagory();
}

 

bean 类

@Entity
public class Category {

    @Id
    private int cid;
    private String createtime;
    private String icon;
    private int ishome;
    private String name;
    @Generated(hash = 1577840102)
    public Category(int cid, String createtime, String icon, int ishome,
            String name) {
        this.cid = cid;
        this.createtime = createtime;
        this.icon = icon;
        this.ishome = ishome;
        this.name = name;
    }
    @Generated(hash = 1150634039)
    public Category() {
    }
    public int getCid() {
        return this.cid;
    }
    public void setCid(int cid) {
        this.cid = cid;
    }
    public String getCreatetime() {
        return this.createtime;
    }
    public void setCreatetime(String createtime) {
        this.createtime = createtime;
    }
    public String getIcon() {
        return this.icon;
    }
    public void setIcon(String icon) {
        this.icon = icon;
    }
    public int getIshome() {
        return this.ishome;
    }
    public void setIshome(int ishome) {
        this.ishome = ishome;
    }
    public String getName() {
        return this.name;
    }
    public void setName(String name) {
        this.name = name;
    }


}

 

MessageBean

public class MessageBean<T> {

    private String msg;
    private String code;
    private T data;

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }
}

 

Adapter
                                                                                 （重点！！！）
public class CategoryAdapter extends RecyclerView.Adapter<CategoryAdapter.ViewHolder> {
    private Context context;
    private List<Category> list;

    public CategoryAdapter(Context context, List<Category> list) {
        this.context = context;
        this.list = list;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = View.inflate(context, R.layout.activity_item, null);
        ViewHolder holder = new ViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Glide.with(context).load(list.get(position).getIcon()).into(holder.imgLogo);
        holder.txtName.setText(list.get(position).getName());
        holder.txtTime.setText(list.get(position).getCreatetime());
    }

    @Override
    public int getItemCount() {
        return list.size();
    }

    class ViewHolder extends RecyclerView.ViewHolder{
        private ImageView imgLogo;
        private TextView txtName;
        private TextView txtTime;

        public ViewHolder(View itemView) {
            super(itemView);

            imgLogo =  itemView.findViewById(R.id.myImage);
            txtName =  itemView.findViewById(R.id.mytitle);
            txtTime =  itemView.findViewById(R.id.mytime);
        }
    }
}