Retrofit and MVP simply implement the ListView data display

It's so hard, summer is here, and so does my cold, and I feel like I'm completely out of shape these two days.

Retrofit and okhttp come from Square, and retrofit is a layer of encapsulation of okhttp. All network requests are handed over to Okhttp, we only need to use retrofit to make network requests through simple configuration

Don't talk too much nonsense, go directly to the code

The first step is to add dependencies and permissions (the sparrow is small but has all the internal organs, don’t underestimate these two steps, sometimes it will take away your job)

rely:

compile 'com.squareup.retrofit2:retrofit:2.0.0-beta4'//Retrofit2所需要的包
compile 'com.squareup.retrofit2:converter-gson:2.0.0-beta4'//ConverterFactory的Gson依赖包
compile 'com.squareup.retrofit2:converter-scalars:2.0.0-beta4'//ConverterFactory的String依赖包

加个XUtils3.0的依赖吧，后期加载图片使用

compile 'org.xutils:xutils:3.3.36'

Permissions are network permissions, I will not write them out!

Layout file, in activity_main, there is a ListView ListView entry layout on the left, an ImageView on the right, and two TextViews on the right

Really into the code ah, keep your eyes open

 Create MyApp to inherit Application

public class MyApp extends Application {
    @Override
public void onCreate() {
        super.onCreate();
        x.Ext.init(this);    
    }
}

Don't forget to register in the manifest file, don't say I didn't tell you

Create Retrofit interface RetrofitUtil

public interface RetrofitUtil {
    @GET("impressApi/news/mergeList?sign=C7548DE604BCB8A17592EFB9006F9265&pageSize=10&gender=2&ts=1871746850&page=1h")
    Call<JavaBean> getString();
}

 Create the MainModel interface in the model layer

public interface MainModel {
    void loadData();
}

Then create the implementation class IMainModel of MainModel

public class IMainModel implements MainModel {

    ListView listView;
    Context context;

    public IMainModel(ListView listView, Context context) {
        this.listView = listView;
        this.context = context;
    }

    @Override
    public void loadData() {
        Retrofit retrofit = new Retrofit.Builder().baseUrl("http://www.yulin520.com/a2a/")
                .addConverterFactory(ScalarsConverterFactory.create())
                .addConverterFactory(GsonConverterFactory.create())
                .build();
        RetrofitUtil retrofitUtil = retrofit.create(RetrofitUtil.class);
        Call<JavaBean> call = retrofitUtil.getString();
        call.enqueue(new Callback<JavaBean>() {
            @Override
            public void onResponse(Call<JavaBean> call, Response<JavaBean> response) {
                JavaBean jaon = response.body();
                MyBaseAdapter adapter = new MyBaseAdapter(context,jaon.data);
                listView.setAdapter(adapter);
            }

            @Override
public void onFailure(Call<JavaBean> call, Throwable t) {            

            }
        });
    }
}

Create the adapter MyBaseAdapter

public class MyBaseAdapter extends BaseAdapter {

    private Context context;
    private ArrayList<JavaBean.DataBean> list;

    public MyBaseAdapter(Context context, ArrayList<JavaBean.DataBean> list) {
        this.context = context;
        this.list = list;
    }

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

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        convertView = View.inflate(context, R.layout.item_layout,null);
        ImageView imageView = (ImageView) convertView.findViewById(R.id.item_image);
        TextView item_name = (TextView) convertView.findViewById(R.id.item_name);
        TextView item_des = (TextView) convertView.findViewById(R.id.item_describe);
        x.image().bind(imageView,list.get(position).userImg);
        item_name.setText(list.get(position).title);
        item_des.setText(list.get(position).introduction);
        return convertView;
    }
}

Create the interface MainPresenter in the presenter layer

public interface MainPresenter {
    void loadData();
    void loadActivity();
}

Next is the implementation class IMainPresenter

public class IMainPresenter implements MainPresenter {
    MainModel mainModel;
    MainView mianView;

    public IMainPresenter(MainModel mainModel, MainView mianView) {
        this.mainModel = mainModel;
        this.mianView = mianView;
    }

    @Override
public void loadData() {
        mainModel.loadData();    
    }

    @Override
public void loadActivity() {
        mainModel.loadData();    
    }
}

Create the MainView interface in the View layer

public interface MainView {
    void loadData();
}

Let MainActivity implement the MainView interface

public class MainActivity extends AppCompatActivity implements MainView {

    private ListView listView;
    MainModel mainModel;
    private MainPresenter presenter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.listView);
        mainModel = new IMainModel(listView,this);
        presenter = new IMainPresenter(mainModel,this);
        presenter.loadActivity();
    }

    @Override
    public void loadData() {
        presenter.loadData();
    }
}