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项目结构：

视图层通过presenter调用模型来获取数据，模型调用retrofit获得数据后，再通过CallBack把数据返回给presenter，presenter通过Impl返回给view，view负责显示就行，逻辑层次明显。

首先要添加相关依赖：

compile 'com.squareup.retrofit2:retrofit:2.0.2'compile 'com.squareup.retrofit2:converter-gson:2.0.2'

model来实现业务操作：

public class PeotryModel {    //测试接口    private String POST_STR = "http://api.apiopen.top/";    //new 一个retrofit对象    Retrofit retrofit = new Retrofit.Builder().baseUrl(POST_STR)            .addConverterFactory(GsonConverterFactory.create())            .build();    //获取古诗信息    public void getPeotry(String name, final PeotryCallBack peotryCallBack) {        final PeotryApi peotryApi = retrofit.create(PeotryApi.class);        Call
   
     peotryBeamCall = peotryApi.peotryBeamPost(name);        peotryBeamCall.enqueue(new Callback
    
     () {            @Override            public void onResponse(Call
     
       call, Response
      
        response) {                PeotryBeam peotryBeam = response.body();                peotryCallBack.onSucceess(peotryBeam);            }            @Override            public void onFailure(Call
       
         call, Throwable t) {                peotryCallBack.onFailed();            }        });    }}
       
      
     
    
   

presenter进行传递：

public class PeotryPresenter {    private PeotryImpl peotryImpl;    private PeotryModel peotryModel;    public PeotryPresenter(PeotryImpl peotryImpl) {        this.peotryImpl = peotryImpl;        peotryModel = new PeotryModel();    }    public void getData(String name) {        peotryModel.getPeotry(name, new PeotryCallBack() {            @Override            public void onSucceess(PeotryBeam peotryBeam) {                peotryImpl.onSuccess(peotryBeam);            }            @Override            public void onFailed() {                peotryImpl.onFailed();            }        });    }}

view负责显示数据：

public class MainActivity extends AppCompatActivity implements View.OnClickListener, PeotryImpl {    private EditText inputEt;    private Button getBtn;    private TextView resultTv;    private PeotryPresenter peotryPresenter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        peotryPresenter = new PeotryPresenter(this);    }    private void initView() {        inputEt = findViewById(R.id.input_et);        getBtn = findViewById(R.id.get_btn);        resultTv = findViewById(R.id.result_tv);        getBtn.setOnClickListener(this);    }    @Override    public void onClick(View view) {        switch (view.getId()) {            case R.id.get_btn:                peotryPresenter.getData(getUserInput());                break;        }    }    @Override    public String getUserInput() {        return inputEt.getText().toString();    }    @Override    public void onSuccess(PeotryBeam peotryBeam) {        resultTv.setText(peotryBeam.getMessage() + "\n" + peotryBeam.getResult());    }    @Override    public void onFailed() {        resultTv.setText("获取失败");    }}

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