andrid中mvp简单实例demo登录和注册

首先简单介绍一下MVP的构成及优缺点：
MVP的全称为Model-View-Presenter,
Model提供数据（网络请求、数据存储等）；
View负责页面显示；
Presenter负责逻辑的处理；
优点：主要就是将Model层和View层完全解耦，使得两者任一方的修改都不会对另一方产生影响，而是将逻辑处理放在了Presenter层；
缺点：显而易见，随着项目的增大，Presenter层也会变得臃肿，所以根据不同项目逻辑灵活的去使用Presenter也很重要；
之前有做过基于MVP的Android项目，根据别人写好的结构，无非就是填充代码，对于MVP整体的理解不够到位，所以该如何从头去理解一个MVP项目，对今后避免一些逻辑错误也是至关重要的。

下面我会以简单的登录模块为例，结合具体代码将整个MVP分步来构建，以便更好的去理解MVP，有需要的可以将完整demo去文末clone下来。
1.View–因为是负责页面的显示所以我们要写一个ILoginView的接口内里面写上比如显示进度应酬进度登录成功登录失败用来提示客户

public interface ILoginView {
    void loginSuccess(UserBean userBean);
    void loginFailed(int status, String errorMsg);
}

2.Model–因为model主要是处理数据问题，所以我们要写一个ILoginModel的接口类，写一个登录的抽象方法

public interface ILoginModel {
    //登录
    void toLogin(String username, String password,ResultCallback callback);
}

3.接着我们要写一个Model的实现类，重写Model里面的抽象方法（实现登录的请求）

public class LoginModelImpl implements ILoginModel{

    @Override
    public void toLogin(String username, String password,ResultCallback callback) {
        UserManager.getUserManager().toLogin(username,password,callback);
    }
}

4.Presenter–作为负责处理逻辑，当view和Model写完后我们就应该写Presenter来将view和Model联系起来
首先我们要写一个presenter的接口类，写一个登录的抽象方法实现

public interface ILoginPresenter extends BasePresenter{
    void toLogin(String username, String password);
}

接着我们要写一个presenter的实现类，重写登录方法

public class LoginPresenterImpl extends BasePresenterImpl implements ILoginPresenter {
private ILoginModel loginModel;

public LoginPresenterImpl(ILoginView view) {
    super(view);
    mView = view;
    loginModel = new LoginModelImpl();//这里要注意
}

@Override
public void toLogin(String username, String password) {
    loginModel.toLogin(username, password, new ResultCallback<ResultBean<UBean>>() {
        @Override
        public void onError(int status, String errorMsg) {
             mView.loginFailed( status,  errorMsg);
        }

        @Override
        public void onResponse(ResultBean<UBean> response) {
            UBean uBean=response.getData();
            UserBean userBean=uBean.getUser();

            mView.loginSuccess(userBean);
        }
    });
}}

5.接下来就开始写activity

/**
 * 登录界面
 * Created by wangbin on 16/12/22.
 */

    public class LoginAct extends BaseAct<ILoginPresenter> implements ILoginView {
        @BindView(R.id.login_phone)
        EditText login_phone;
        @BindView(R.id.login_pwd)
        EditText login_pwd;
    
        private String username, pwd;
    
        @Override
        public int getLayout() {
            return R.layout.act_login;
        }
    
        @Override
        public void init(Bundle savedInstanceState) {
            mPresenter = new LoginPresenterImpl(this);
        }
    
        @OnClick({R.id.tv_toRegister, R.id.tv_toForget, R.id.btn_login})
        public void OnClick(View v) {
            switch (v.getId()) {
                case R.id.tv_toRegister://注册
                    AppManager.getAppManager().addActivity(LoginAct.this);
                    openActivity(RegisterAct.class);
                    break;
                case R.id.tv_toForget://忘记密码
                    openActivity(ForgetPwdAct.class);
                    break;
                case R.id.btn_login://登录
                    if (isValidate()) {
                        showProgress("正在登录中...");
                        mPresenter.toLogin(username, pwd);
                    }
                    break;
            }
        }
    
    
        @Override
        public void loginSuccess(UserBean userBean) {
            hideProgress();
            toast("登录成功");
            openActivity(MainAct.class);
    //        sendBroadcast(new Intent(HomeFrg.UPDATA));
            finish();
        }
    
        /**
         * 失败
         *
         * @param status
         * @param errorMsg
         */
        @Override
        public void loginFailed(int status, String errorMsg) {
            hideProgress();
            toast(errorMsg);
        }
    
    
        private boolean isValidate() {
            username = login_phone.getText().toString().trim();
            pwd = login_pwd.getText().toString().toString();
            if (TextUtils.isEmpty(username)) {
                toast("请输入手机号码！");
                login_phone.requestFocus();
                return false;
            }
            if (TextUtils.isEmpty(pwd)) {
                toast("请输入密码!");
                login_pwd.requestFocus();
                return false;
            }
            return true;
        }
    }

Base基类
**

基础类

Created by wangbin on 16/12/22.
*/

public abstract class BaseAct extends FragmentActivity implements BaseView {
private TextView tv_title;
private TextView tvRight;
private ImageView ivRight;
private RelativeLayout rl_right;
private SafeDialog dialog;
/**
* 将代理类通用行为抽出来
*/
protected T mPresenter;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     // 手机窗口设置无标题
     requestWindowFeature(Window.FEATURE_NO_TITLE);
     setContentView(View.inflate(this, getLayout(), null));
     //注入控件
     ButterKnife.bind(this);
     init(savedInstanceState);
 }

 /**
  * 设置布局
  */
 public abstract int getLayout();

 /**
  * 填充数据
  */
 public abstract void init(Bundle savedInstanceState);


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

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

 @Override
 public void toast(String msg) {
     MyToastUtils.showShortToast(getApplicationContext(), msg);
 }

 @Override
 public void showProgress(String message) {
     dialog=new SafeDialog(this);
     dialog.setMessage(message);
     dialog.setCancelable(false);
     dialog.show();
 }

 @Override
 public void hideProgress() {
     if(dialog!=null){
         dialog.dismiss();
     }
 }

 @Override
 public void openActivity(Class<?> pClass) {
     openActivity(pClass, null);
 }

 @Override
 public void openActivity(Class<?> pClass, Bundle pBundle) {
     Intent intent = new Intent(this, pClass);
     if (pBundle != null) {
         intent.putExtras(pBundle);
     }
     startActivity(intent);
 }

 /**
  * 设置顶部标题
  *
  * @param title
  */
 public void setTopTitle(String title) {
     tv_title = (TextView) findViewById(R.id.tv_title);
     if (title != null) {
         tv_title.setText(title);
     }
 }

 /**
  * 顶部右边按键
  *
  * @param rightText
  */
 public void setRightBtn(String rightText, View.OnClickListener listener) {
     tvRight = (TextView) findViewById(R.id.tvRight);
     rl_right = (RelativeLayout) findViewById(R.id.rl_right);
     if (!TextUtils.isEmpty(rightText)) {
         tvRight.setText(rightText);
         rl_right.setVisibility(View.VISIBLE);
         tvRight.setVisibility(View.VISIBLE);
     }
     if (listener != null) {
         rl_right.setOnClickListener(listener);
     }
 }

 /**
  * 顶部右边按键(带图片)
  *
  * @param res
  */
 public void setRightBtn(int res, View.OnClickListener listener) {
     ivRight = (ImageView) findViewById(R.id.ivRight);
     rl_right = (RelativeLayout) findViewById(R.id.rl_right);
     rl_right.setVisibility(View.VISIBLE);
     ivRight.setVisibility(View.VISIBLE);
     ivRight.setImageResource(res);
     if (listener != null) {
         rl_right.setOnClickListener(listener);
     }
 }

 public void goBack(View view) {
     finish();
 }

}

andrid中mvp简单实例demo登录和注册

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