RecyclerView展示

public class ShouYeActivity extends AppCompatActivity implements ShowView {
private RecyclerView rlv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_shou_ye);
rlv = findViewById(R.id.rlv);
//创建布局管理器
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
//设置布局管理器
rlv.setLayoutManager(linearLayoutManager);
//采用MVP
//采用presenter
ShowPresenter presenter=new ShowPresenter(this);
//关联是为了使用弱引用管理外部类对象
presenter.related();
}
//view层获取到数据
public void show(JSONArray result) {
//把数据给适配器
Madapter madapter = new Madapter(this, result);
rlv.setAdapter(madapter);
}
}
/////M层
public class ShowModel {

private String url = "http://172.17.8.100/small/commodity/v1/bannerShow";
//回调接口
public interface OnShowListener {
    void onShow(JSONArray result);
}
//实例化
private OnShowListener lisenter;
public void setOnShowListener(OnShowListener lisenter) {
    this.lisenter = lisenter;
}

//handler处理机制
@SuppressLint("HandlerLeak")
private Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        switch (msg.what) {
            case 0:
                String json = (String) msg.obj;
                //Json解析
                try {
                    JSONObject array = new JSONObject(json);
                    JSONArray result = array.getJSONArray("result");
                    if (lisenter != null) {
                        lisenter.onShow(result);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
                break;
        }
    }
};
//1.获取网络数据
public void getGoodsData() {
    OkHttpUtils.getInstance().doGet(url, new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
        }
        //成功
        @Override
        public void onResponse(Call call, Response response) throws IOException {
            String json = response.body().string();

            //handler发送数据
            Message message = new Message();
            message.what = 0;
            message.obj = json;
            handler.sendMessage(message);
        }
    });
}

}
///P层
public class ShowPresenter {

private final ShowModel showModel;
private final ShowView showView;
private WeakReference<T> mViewRef;

//构造方法中实例化showModel和showView
public ShowPresenter(ShowView view) {
    showModel = new ShowModel();
    showView = view;
}

//在P层中使用WeakReference管理外部对象
public void attachView(T t) {
    //创建弱引用
    mViewRef = new WeakReference<>(t);
}

//1.P关联M层
public void related() {
    showModel.getGoodsData();
    showModel.setOnShowListener(new ShowModel.OnShowListener() {
        @Override
        public void onShow(JSONArray result) {
            //把数据给V
            showView.show(result);
        }
    });
}
//解除关联
public void detachView() {
    if (mViewRef.get() != null) {
        mViewRef.clear();
        mViewRef = null;
    }
}

}
////V层
public interface ShowView {
void show(JSONArray result);
}

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