MVP是个好东西，可是最近项目一直用的是mvc模式，先马克下之前鼓捣过的mvp框架，过年回家再用它重构下代码。

先上依赖库####

  compile 'io.reactivex:rxandroid:1.2.1'  
  compile 'com.squareup.okhttp3:okhttp:3.3.1'  
  compile 'io.reactivex:rxandroid:1.1.0'  
  compile 'io.reactivex:rxjava:1.1.0'  
  compile 'com.squareup.retrofit:retrofit:2.0.0-beta2'  
  compile 'com.squareup.retrofit:converter-gson:2.0.0-beta2'  
  compile 'com.squareup.retrofit:adapter-rxjava:2.0.0-beta2'  
  compile 'com.android.support:design:24.2.1'  
  compile 'com.android.support:recyclerview-v7:24.2.1'  
  compile 'com.android.support:cardview-v7:24.2.1'  
  compile 'com.jakewharton:butterknife:7.0.1'  
  compile 'com.github.bumptech.glide:glide:3.7.0'  
  compile 'com.github.chrisbanes.photoview:library:1.2.3'  

建议写死依赖的版本号，而不要使用“+”，避免版本升级带了一些奇葩的问题。

依赖retrolambda####

在app.build依赖

    apply plugin: 'me.tatarka.retrolambda'  

再加上

    compileOptions {  
    sourceCompatibility JavaVersion.VERSION_1_8  
     targetCompatibility JavaVersion.VERSION_1_8  
   }  

然后在整个项目的build文件上面加入：

      classpath 'me.tatarka:gradle-retrolambda:3.2.5' 

OK，到这里我们的环境搭建就完成了

首先我们看下项目的目录结构：

base文件

BaseContract（基本的文件类，我们可以在里面写上view层，model层，Presenter层的interface）

  /**
   * Created by Ly on 2016/11/2.
   */

  public class BaseContract  {
}

BaseModel(基本的model层，所有耗时操作应该写在model层中)

  /**
   * Created by Ly on 2016/11/2.
   */

  public interface BaseModel {
  }

BaseView层（写入跟用户交互的方法集合类，比如showTosast，showDialog）

    /**
   * Created by Ly on 2016/11/2.
     */

  public interface BaseView {
      void TsShow(String msg);
  }

看下我们的基本baseActivity.java:

package com.Ly.BaseJustTalk.base;

import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.AppBarLayout;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.text.TextUtils;
import android.util.TypedValue;
import android.view.MenuItem;
import android.widget.Toast;

import com.Ly.BaseJustTalk.R;

import butterknife.ButterKnife;

/**
 * Created by Ly on 2017/1/12.
 */
public abstract class BaseActivity<V, T extends BasePresenter<V>> extends AppCompatActivity {

    protected T mPresenter;
    private SwipeRefreshLayout mRefreshLayout;
    private AppBarLayout mAppBar;
    private Toolbar mToolbar;
    private ProgressDialog mProgressBar;
    protected Context mContext;
    private boolean mIsRequestDataRefresh = false;

    private static final String EXTRA_KEY = "extra";

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        dogetExtra();
        mContext = this;
        // 允许为空，不是所有的页面都要实现这个模式
        if (createPresenter() != null) {
            mPresenter = createPresenter();
            mPresenter.attachView((V) this);
        }
        setContentView(provideContentViewId());
        ButterKnife.bind(this);

        mAppBar = findViewById(R.id.app_bar_layout);
        mToolbar = (Toolbar) findViewById(R.id.toolbar);
        if (mToolbar != null && mAppBar != null) {
            setSupportActionBar(mToolbar); //把Toolbar当做ActionBar给设置

            if (canBack()) {
                ActionBar actionBar = getSupportActionBar();
                if (null != actionBar) {
                    //设置ActionBar一个返回箭头，主界面没有，次级界面有
                    actionBar.setDisplayHomeAsUpEnabled(true);
                }
                if (Build.VERSION.SDK_INT >= 21) {
                    //Z轴浮动
                    mAppBar.setElevation(10.6F);
                }
            }
        }
        if (isSetRefresh()) {
            setupSwipeRefresh();
        }
    }


    public static void doStartActivity(Context context, Bundle bundle, Class<?> clz) {
        Intent intent = new Intent(context, clz);
        if (bundle != null) {
            intent.putExtra(EXTRA_KEY, bundle);
        }
        context.startActivity(intent);
    }


    protected abstract void dogetExtra();

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // 此时android.R.id.home即为返回箭头
        if (item.getItemId() == android.R.id.home) {
            onBackPressed();
            finish();
            return true;
        } else {
            return super.onOptionsItemSelected(item);
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (mPresenter != null) {
            mPresenter.detachView();
        }
    }

    /**
     * 生成下拉刷新
     */
    private void setupSwipeRefresh() {
        mRefreshLayout = findViewById(R.id.swipe_refresh);
        if (null != mRefreshLayout) {
            mRefreshLayout.setColorSchemeResources(R.color.colorAccent, R.color.colorPrimary);
            mRefreshLayout.setProgressViewOffset(true,
                    0,
                    (int) TypedValue.applyDimension
                            (TypedValue.COMPLEX_UNIT_DIP, 24, getResources()
                                    .getDisplayMetrics()));
        }
    }


    /**
     * 设置刷新
     *
     * @param requestDataRefresh
     */
    public void setRefresh(boolean requestDataRefresh) {
        if (mRefreshLayout == null) {
            return;
        }
        if (!requestDataRefresh) {
            mIsRequestDataRefresh = false;
            mRefreshLayout.postDelayed(() -> {
                if (mRefreshLayout != null) {
                    mRefreshLayout.setRefreshing(false);
                }
            }, 1000);
        } else {
            mRefreshLayout.setRefreshing(true);
        }
    }


    /**
     * 数据刷新
     */
    public void requestDataRefresh() {
        mIsRequestDataRefresh = true;
    }

    /**
     * 判断当前页面是否可以返回，
     * 主界面不可以返回  子界面可以放回
     *
     * @return
     */
    public boolean canBack() {
        return false;
    }

    /**
     * 判断子Activity是否需要上下拉刷新功能
     *
     * @return
     */
    public Boolean isSetRefresh() {
        return false;
    }

    /**
     * 创建P
     *
     * @return
     */
    protected abstract T createPresenter();

    /**
     * 引入布局文件
     *
     * @return
     */
    protected abstract int provideContentViewId();

    protected void ShowTs(String msg) {
        Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
    }


    protected void ShowDialog() {
        ShowDialog(null);
    }

    protected void ShowDialog(String msg) {
        if (TextUtils.isEmpty(msg)) {
            msg = getString(R.string.loading);
        }
        mProgressBar = ProgressDialog.show(this, null, msg);
    }

    protected void DissDialog() {
        if (mProgressBar != null && mProgressBar.isShowing()) {
            mProgressBar.dismiss();
        }
    }
}

相对应的BaseFragment.java 代码如下：

package com.Ly.BaseJustTalk.base;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.Ly.BaseJustTalk.R;

import butterknife.ButterKnife;

/**
* Created by Ly on 2011/1/12.
*/

public abstract class BaseFragment<V, T extends BasePresenter<V>> extends Fragment {
   protected Context mContext;
   protected T mPresenter;

   private boolean mIsRequestDataRefresh = false;
   private SwipeRefreshLayout mRefreshLayout;

   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       mContext = getActivity();
       mPresenter = createPresenter();
       mPresenter.attachView((V) this);
   }

   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
       View rootView = inflater.inflate(createViewLayoutId(), container, false);
       ButterKnife.bind(this, rootView);
       initView(rootView);
       if (isSetRefresh()) {
           setupSwipeRefresh(rootView);
       }
       return rootView;
   }

   @Override
   public void onDestroy() {
       super.onDestroy();
       mPresenter.detachView();
   }

   private void setupSwipeRefresh(View view) {
       mRefreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.swipe_refresh);
       if (mRefreshLayout != null) {
           mRefreshLayout.setColorSchemeResources(R.color.refresh_progress_1,
                   R.color.refresh_progress_2, R.color.refresh_progress_3);
           mRefreshLayout.setProgressViewOffset(true, 0, (int) TypedValue
                   .applyDimension(TypedValue.COMPLEX_UNIT_DIP, 24, getResources().getDisplayMetrics()));
           mRefreshLayout.setOnRefreshListener(this::requestDataRefresh);
       }
   }

   public void requestDataRefresh() {
       mIsRequestDataRefresh = true;
   }


   public void setRefresh(boolean requestDataRefresh) {
       if (mRefreshLayout == null) {
           return;
       }
       if (!requestDataRefresh) {
           mIsRequestDataRefresh = false;
           mRefreshLayout.postDelayed(() -> {
               if (mRefreshLayout != null) {
                   mRefreshLayout.setRefreshing(false);
               }
           }, 1000);
       } else {
           mRefreshLayout.setRefreshing(true);
       }
   }

   protected abstract T createPresenter();

   protected abstract int createViewLayoutId();

   protected void initView(View rootView) {
   }

   public Boolean isSetRefresh() {
       return true;
   }
}

Ok,直接看实例代码来理解，就用登录界面的吧。

登录界面的包目录

其中LoginActiviy为用户能看到的界面；
Contract是mvp的协议层；Model为数据处理层；Presenter可以理解为桥梁，负责沟通连接M层和V层。

在我的理解里的MVP是这个意思：我们可以看到，这个类持有了View和Model两个模块，在方法体里面，我们调用了model的方法去做耗时，在结果方法体里面我们调用了view的方法去修改UI，同时presenter这个模块又被view持有了，view可以在声明周期里面去调用特定的方法，view和presenter相互沟通，view和model完全隔离，presenter调控model，presenter沟通全局。

看下我们的登录界面：
activity_login.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1.5"
        android:gravity="center"
        android:text="@string/text_welcome"
        android:textSize="25sp" />


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginLeft="@dimen/margin_left"
        android:layout_marginRight="@dimen/margin_right"
        android:layout_weight="3"
        android:orientation="vertical">

        <android.support.design.widget.TextInputLayout
            android:id="@+id/til_username"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <EditText
                android:id="@+id/et_username"
                style="@style/edit_style"
                android:inputType="text"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/text_username" />
        </android.support.design.widget.TextInputLayout>

        <android.support.design.widget.TextInputLayout
            android:id="@+id/til_password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="@dimen/margin6">

            <EditText
                android:id="@+id/et_password"
                style="@style/edit_style"
                android:inputType="textPassword"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/text_password" />
        </android.support.design.widget.TextInputLayout>

        <Button
            android:id="@+id/bt_login"
            style="@style/button_style"
            android:layout_width="match_parent"
            android:layout_height="@dimen/button_height"
            android:layout_marginTop="@dimen/margin20"
            android:text="@string/text_login_reg" />
    </LinearLayout>
</LinearLayout>

LoginContract.java

package com.Ly.BaseJustTalk.ui.activity.Login;

import com.Ly.BaseJustTalk.base.BaseModel;
import com.Ly.BaseJustTalk.base.BaseView;

/**
 * Created by Ly on 2017/1/16.
 */
public class LoginContract {


    interface LoginView extends BaseView {
        String getUserName();

        String getUserPass();

        //            userName错误后进行提示
        void setUserNameErr(String errMsg);

        //            密码错误后进行提示
        void setPassErr(String errMsg);

        void doJustalkLogin();

        void doLoginFial();
    }


    interface LoginModel extends BaseModel {

        /**
         * @param userName
         * @param Pass
         * @return 0 合法账户密码 给予执行下一步
         * -1 用户名为空
         * -2 用户密码为空
         * -3 用户名不合法
         * -4 用户密码不合法
         */
        int isRightUserNamePass(String userName, String Pass);

        /**
         * 进行justalk的登录
         *
         * @param userName
         * @param pass
         * @return
         */
        boolean doJustalkLogin(String userName, String pass);
    }


    interface LoginPresenter {
        //        验证用户输入的信息
        void doVerificationInfo();

        //          验证正确后进行登录
        void doJustalkLogin();
    }
}

LoginModel.java

package com.Ly.BaseJustTalk.ui.activity.Login;

import android.text.TextUtils;
import android.util.Log;

import com.Ly.BaseJustTalk.R;
import com.Ly.BaseJustTalk.application.LyApplication;
import com.justalk.cloud.juslogin.LoginDelegate;

/**
 * Created by Administrator on 2017/1/16.
 */
public class LoginModel implements LoginContract.LoginModel {


    /**
     * 验证账号合法性
     *
     * @param userName
     * @param Pass
     * @return 0 合法账户密码 给予执行下一步
     * -1 用户名为空
     * -2 用户密码为空
     * -3 用户名不合法
     * -4 用户密码不合法
     */
    @Override
    public int isRightUserNamePass(String userName, String Pass) {
        if (TextUtils.isEmpty(userName)) {
            return -1;
        } else if (TextUtils.isEmpty(Pass)) {
            return -2;
        } else if (userName.length() < 4 || userName.length() > 12) {
            return -3;
        } else if (Pass.length() < 6 || Pass.length() > 12) {
            return -4;
        } else
            return 0;
    }

    @Override
    public boolean doJustalkLogin( String userName, String pass) {
        if (LoginDelegate.getInitState() == LoginDelegate.InitStat.MTC_INIT_FAIL) {
            return false;
        }
        String server = LyApplication.getInstance().getString(R.string.JusTalkCloud_network_address);
        String network = null;
        if (!server.startsWith("sudp:")) {
            network = server;
            server = "sarc:arc@AccessEntry:99";
            Log.e("testtest", server);
        }
        if (LoginDelegate.login(userName, pass, server, network)) {
            return true;
        }
        return false;
    }
}

LoginPresenter.java

package com.Ly.BaseJustTalk.ui.activity.Login;

import com.Ly.BaseJustTalk.base.BasePresenter;

/**
 * Created by Ly on 2017/1/16.
 */
public class LoginPresenter extends BasePresenter<LoginContract.LoginView> implements
        LoginContract.LoginPresenter {
    private LoginContract.LoginView loginView;
    private LoginContract.LoginModel loginModel;

    public LoginPresenter(LoginContract.LoginView loginView) {
        this.loginView = loginView;
        loginModel = new LoginModel();
    }

    @Override
    public void doVerificationInfo() {
        int resultcode = this.loginModel.isRightUserNamePass(this.loginView.getUserName(), this.loginView.getUserPass());
        switch (resultcode) {
            case -1:
                this.loginView.setUserNameErr("请输入用户名");
                break;
            case -2:
                this.loginView.setPassErr("请输入用户密码");
                break;
            case -3:
                this.loginView.setUserNameErr("请检查用户名格式或长度");
                break;
            case -4:
                this.loginView.setPassErr("请检查密码格式或长度");
                break;
            case 0:
                this.loginView.setUserNameErr(null);
                this.loginView.setPassErr(null);
                this.loginView.doJustalkLogin();
                break;
            default:
                this.loginView.TsShow("未知错误");
                break;
        }
    }

    @Override
    public void doJustalkLogin() {
        boolean isLoginSuccess = this.loginModel.doJustalkLogin(this.loginView.getUserName(), this.loginView.getUserPass());
        if (!isLoginSuccess) {
            this.loginView.doLoginFial();
        }
    }
}

LoginActivity.java

package com.Ly.BaseJustTalk.ui.activity.Login;

import android.os.Bundle;
import android.support.design.widget.TextInputLayout;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;

import com.Ly.BaseJustTalk.R;
import com.Ly.BaseJustTalk.base.BaseActivity;
import com.Ly.BaseJustTalk.ui.activity.MainActivity;
import com.Ly.BaseJustTalk.utils.Signer;
import com.justalk.cloud.juslogin.LoginDelegate;
import com.justalk.cloud.lemon.MtcCli;
import com.justalk.cloud.lemon.MtcCliConstants;

import butterknife.Bind;
import butterknife.OnClick;

/**
 * Created by Ly on 2017/1/16.
 */
public class LoginActivity extends BaseActivity<LoginContract.LoginView, LoginPresenter>
        implements LoginContract.LoginView, LoginDelegate.Callback {
    @Bind(R.id.et_username)
    EditText etUsername;
    @Bind(R.id.til_username)
    TextInputLayout tilUsername;
    @Bind(R.id.et_password)
    EditText etPassword;
    @Bind(R.id.til_password)
    TextInputLayout tilPassword;
    @Bind(R.id.bt_login)
    Button btLogin;


    private LoginContract.LoginPresenter loginPresenter = new LoginPresenter(this);

    @OnClick(R.id.bt_login)
    void toLogin() {
        loginPresenter.doVerificationInfo();
    }

    @Override
    protected LoginPresenter createPresenter() {
        return new LoginPresenter(this);
    }

    @Override
    protected int provideContentViewId() {
        return R.layout.activity_login;
    }

    @Override
    public void TsShow(String msg) {
        ShowTs(msg);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        LoginDelegate.setCallback(this);
    }


    @Override
    protected void dogetExtra() {

    }


    @Override
    public String getUserName() {
        return etUsername.getText().toString().trim();
    }

    @Override
    public String getUserPass() {
        return etPassword.getText().toString().trim();
    }

    @Override
    public void setUserNameErr(String errMsg) {
        tilUsername.setError(errMsg);
    }

    @Override
    public void setPassErr(String errMsg) {
        tilPassword.setError(errMsg);
    }

    @Override
    public void doJustalkLogin() {
        ShowDialog();
        if (MtcCli.Mtc_CliGetState() != MtcCliConstants.EN_MTC_CLI_STATE_LOGINED) {
            this.loginPresenter.doJustalkLogin();
        } else {
            MainActivity.doStartActivity(mContext, null, MainActivity.class);
        }
    }

    @Override
    public void doLoginFial() {
        ShowTs(getString(R.string.tips_login_fail));
    }

    @Override
    public void mtcLoginOk() {
        MainActivity.doStartActivity(mContext, null, MainActivity.class);
    }

    @Override
    public void mtcLoginDidFail() {
        ShowTs(getString(R.string.tips_login_fail_justalk));
    }

    @Override
    public void mtcLogoutOk() {

    }

    @Override
    public void mtcLogouted() {

    }

    @Override
    public void mtcAuthRequire(String s, String s1) {
        Log.e("LHT", "mtcAuthRequire: " + s + "----" + s1);
        String key =
                "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" +
                        "tRPBKBjUTEQwaKEjPy8YnX1bUODPB+7hto8KeGJbnCdCcnJdLxPFE7ld1skKIyPi" +
                        "YkyHj73JqA41ntHML2LNqw5Mhs1pewE4QLCu6icIUNtH8+bL53EhVnfdzwIDAQAB" +
                        "AoGAA6i6c5xHEGfKzoDHQJgiC5X9ZFAtES5AG3IMJmtF9flQyeoeDzRit+/FwNXi" +
                        "M1CKohnvLAJTvPs/8TBp5us4rabQ5Hnp+ylr7I2IbYIP2LV6TKkiTq/fBOJBxZiw" +
                        "qs0tjXxRZnC2IWqoCt/ciE4DXQIYVV3gYMRcKae5KZ3F2LECQQDqL4Sd2xyG0FsW" +
                        "cKwrlFRQ1cfFrSF/jmm2onkCZgDfq0R5aIGewpbTciLj8rf/Zq0XgAmCa3qQYo6M" +
                        "7G0OgIXTAkEAxbIC2xJocvPfEFbUd+hEWDFl/3LtQWZSHVLx9SXLXWSRY4/3dyRM" +
                        "6L78eQ2yWIVF4pxJrIHTbJqhxItlVM/elQJBAJ3jRZ0L8hKufQsHEf0btzD8wQB0" +
                        "doZCZOF+bumADgy+sp7MJ7/636dVZ1KZ/RWTixWx/DdS8UJRQFygtfI2EoMCQHky" +
                        "4tFPfb1LiStJMES6nnu6/R8YZB++DQVxPmjeXMjKyN9S+ZGPLZ9axwmnvfjK68c7" +
                        "rWcWyHlCa35FP0A5l+kCQB5cEu5Au1RkY9XfUodKmFhlCvdY8Ig0JgZ8DC6m+A31" +
                        "o4xrCoGHiPldKdCo0I7gQ4WMvoVNHCQyNv5qcw9t7uk=";
        String code = Signer.signWithKey(key, s, s1, 3600);
        LoginDelegate.promptAuthCode(code);
    }


    @Override
    protected void onDestroy() {
        super.onDestroy();
        LoginDelegate.logout();
    }
}

更新 这个框架里面的循环嵌套的方法

 final String account = "111_111_1111", password = "1234556";
        HttpRequest.getApiService().doRegister(account, password).concatMap(new Function<RegisterBean, Flowable<LoginUserBean>>() {
            @Override
            public Flowable<LoginUserBean> apply(RegisterBean registerBean) throws Exception {
                if (registerBean.getStatus().equals(ErrCodeMessage.statusSuc)) {
                    XLog.e(registerBean.getMessage());
                    return HttpRequest.getApiService().doLogin(account, password);
                } else {
                    return Flowable.empty();
                }
            }
        }).compose(XApi.<LoginUserBean>getScheduler()).compose(XApi.<LoginUserBean>getApiTransformer())
                .compose(this.<LoginUserBean>bindToLifecycle()).subscribe(new ApiSubscriber<LoginUserBean>() {
            @Override
            protected void onFail(NetError error) {
                XLog.e("xxxxxxxxxxxx" + error.getMessage());
            }

            @Override
            public void onNext(LoginUserBean loginUserBean) {
                XLog.e("xxxxxxxxxxxx" + loginUserBean.toString());
            }
        });

如果注册失败的时候 返回 return Flowable.empty(); 一个空的