model

package com.bawei.gsc.gsc0324;

import io.reactivex.Observable;

public class AModel implements Contart.IModel {

    private Apresenter apresenter;

    public AModel(Apresenter apresenter) {
        this.apresenter = apresenter;
    }

    @Override
    public void getloginModel(String phone, String pwd) {
        Observable<ABean> data = RetrofitUtils.getmInstance().getservice().getData(phone, pwd);
        apresenter.getloginPresenter(data);
    }
}

presenter

public class Apresenter implements Contart.IPresenter {

    private AModel aModel;
    private Contart.IView iView;

    public Apresenter(Contart.IView iView) {
        this.iView = iView;
        aModel = new AModel(this);
    }
    public void getkey(String key,String pwd){
        aModel.getloginModel(key, pwd);
    }
    @Override
    public void getloginPresenter(Observable<ABean> abean) {
        abean.subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<ABean>() {
                    @Override
                    public void onSubscribe(Disposable d) {

                    }

                    @Override
                    public void onNext(ABean aBean) {
                        iView.success(aBean);
                    }

                    @Override
                    public void onError(Throwable e) {
                        iView.failure(e.getMessage());
                    }

                    @Override
                    public void onComplete() {

                    }
                });
    }
}

RetrofitUtils

public class RetrofitUtils {

    private static RetrofitUtils mInstance;
    private final Retrofit retrofit;

    public static RetrofitUtils getmInstance() {
        if (mInstance==null){
            synchronized (RetrofitUtils.class){
                if (mInstance==null){
                    mInstance=new RetrofitUtils();
                }
            }
        }
        return mInstance;
    }

    private RetrofitUtils() {
        retrofit = new Retrofit.Builder()
                .baseUrl("")
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .build();
    }

    public WeiduService getservice(){
        return retrofit.create(WeiduService.class);
    }

}

public class MainActivity extends AppCompatActivity implements Contart.IView{

    private FragmentManager supportFragmentManager;
    private OneFragment oneFragment;
    private TwoFragment twoFragment;
    private FragmentTransaction fragmentTransaction;
    private FrameLayout frame;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        toolbar.setTitle("");
        setSupportActionBar(toolbar);
        frame = findViewById(R.id.frame);
        supportFragmentManager = getSupportFragmentManager();
        oneFragment = new OneFragment();
        twoFragment = new TwoFragment();
        fragmentTransaction = supportFragmentManager.beginTransaction();
        fragmentTransaction.add(R.id.frame,oneFragment);
        fragmentTransaction.add(R.id.frame,twoFragment);
        fragmentTransaction.commit();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        FragmentTransaction transaction = supportFragmentManager.beginTransaction();
        if (id==R.id.reying){
            transaction.show(oneFragment).hide(twoFragment).commit();
            Toast.makeText(this, "第一", Toast.LENGTH_SHORT).show();
            return true;
        }else if (id==R.id.shangying){
            transaction.show(twoFragment).hide(oneFragment).commit();
            Toast.makeText(this, "第二", Toast.LENGTH_SHORT).show();
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void success(ABean aBean) {

    }

    @Override
    public void failure(String msg) {

    }
}