基于MVP框架+GreenDao的简易登录注册demo

1.首先添加GreenDao的依赖。添加后整体如下：

apply plugin: 'com.android.application'
apply plugin: 'org.greenrobot.greendao'

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'org.greenrobot:greendao-gradle-plugin:3.0.0'
    }
}
greendao {
    schemaVersion 1
    daoPackage 'com.example.anonymous.greendao'
    targetGenDir 'src/main/java'
}
android {
    compileSdkVersion 25
    buildToolsVersion "25.0.3"
    defaultConfig {
        applicationId "com.example.mvptest"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.3.1'
    compile 'com.android.support:design:25.3.1'
    compile'org.greenrobot:greendao:3.0.1'
    compile'org.greenrobot:greendao-generator:3.0.0'
    testCompile 'junit:junit:4.12'
}

2.建立model

实体类：User

@Entity
public class User {
    @Id
    private String username;
    private String password;
    public String getPassword() {
        return this.password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getUsername() {
        return this.username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    @Generated(hash = 2090636610)
    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }
    @Generated(hash = 586692638)
    public User() {
    }
}

业务类：

一个实现登录注册的接口和实现类：

public interface IUserBiz {
    void login(String username,String password,OnLoginListener loginListener);
    void register(String username,String password,OnRegisterListener onRegisterListener);
}

public class UserBiz implements IUserBiz {
    @Override
    public void login(String username, String password, OnLoginListener loginListener) {
        DaoMaster.DevOpenHelper devOpenHelper = new DaoMaster.DevOpenHelper(MyApplication.getmContext(),"warehouse",null);
        DaoMaster daoMaster = new DaoMaster(devOpenHelper.getWritableDatabase());
        DaoSession daoSession = daoMaster.newSession();
        UserDao userDao = daoSession.getUserDao();
        List<User> userList = userDao.queryBuilder()
                .build().list();
        if(userList == null){
            Log.e("register","数据库里无数据");
                    }else {
            int flag = 0;
            for(User user : userList){
                if(user.getUsername().equals(username) && user.getPassword().equals(password)){
                    loginListener.loginSuccess();
                    flag = 1;
                    break;
                }
            }
            if(flag == 0){
                loginListener.loginFail();
            }
        }
    }

    @Override
    public void register(String username, String password, OnRegisterListener onRegisterListener) {
        DaoMaster.DevOpenHelper devOpenHelper = new DaoMaster.DevOpenHelper(MyApplication.getmContext(),"warehouse",null);
        DaoMaster daoMaster = new DaoMaster(devOpenHelper.getWritableDatabase());
        DaoSession daoSession = daoMaster.newSession();
        UserDao userDao = daoSession.getUserDao();
        List<User> userList = userDao.queryBuilder()
                .build().list();
        if(userList == null){
            Log.e("register","数据库里无数据");
        }else{
            int flag = 0;
            for(User user1 : userList){
                if(user1.getUsername().equals(username)){
                    flag = 1;
                    onRegisterListener.registerFail();
                    break;
                }
            }
            if (flag == 0) {
                User user2 = new User(username,password);
                userDao.insert(user2);
                onRegisterListener.registerSuccess();
            }
        }
    }

    }

两个处理model业务类完成逻辑后通过Present返回数据给View的接口：

public interface OnRegisterListener {
    void registerSuccess();
    void registerFail();
}

public interface OnLoginListener {
    void loginSuccess();
    void loginFail();
}

View类：

public class MainActivity extends AppCompatActivity implements UserBaseActivity{
    private UserPresent loginPresent = new UserPresent(this);
    private EditText ma_username,ma_password;
    private Button ma_login,ma_register;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }
    private void initView(){
        ma_username = (EditText) findViewById(R.id.username);
        ma_password = (EditText) findViewById(R.id.password);
        ma_login = (Button) findViewById(R.id.login);
        ma_register = (Button) findViewById(R.id.register);
        ma_register.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                register();
            }
        });
        ma_login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                login();
            }
        });
    }
    @Override
    public void login() {
        loginPresent.login();
    }

    @Override
    public void register() {
        startActivity(new Intent(MainActivity.this,RegisterActivity.class));
    }
    public String getLoginUsername(){
        return ma_username.getText().toString();
    }
    public String getLoginPassword(){
        return ma_password.getText().toString();
    }
}

public class RegisterActivity extends AppCompatActivity implements UserRegisterActivity {
    private RegisterPresent registerPresent;
    private Button ra_register,ra_back;
    private EditText ra_username,ra_password;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);
        registerPresent = new RegisterPresent(this);
        initView();
    }
    private void initView(){
        ra_back = (Button) findViewById(R.id.rc_back);
        ra_register = (Button) findViewById(R.id.ra_register);
        ra_username = (EditText) findViewById(R.id.et_username);
        ra_password = (EditText) findViewById(R.id.et_password);
        ra_back.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                back();
            }
        });
        ra_register.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                register();
            }
        });
    }
    @Override
    public void register() {
        Log.e("register","register");
        registerPresent.register();
    }

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

    @Override
    public String getPassword() {
        return ra_password.getText().toString();
    }

    @Override
    public void back() {
        finish();
    }
}

3.Present类：

public class RegisterPresent {
    private UserBiz iUserBiz;

    private RegisterActivity userRegisterActivity;
    public RegisterPresent(RegisterActivity userRegisterActivity){
        this.iUserBiz = new UserBiz();
        this.userRegisterActivity = userRegisterActivity;
    }
    public void register(){
        Log.e("registerPresent","正在注册0");

        iUserBiz.register(userRegisterActivity.getUserName(),userRegisterActivity.getPassword(), new OnRegisterListener() {
            @Override
            public void registerSuccess() {
                Toast.makeText(userRegisterActivity, "注册成功", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void registerFail() {
                Toast.makeText(userRegisterActivity, "账号已经存在", Toast.LENGTH_SHORT).show();
            }
        });

    }
}

public class UserPresent {
    private UserBiz iUserBiz;
    private MainActivity userBaseActivity;
    public UserPresent(MainActivity userBaseActivity){
        this.userBaseActivity = userBaseActivity;
        iUserBiz = new UserBiz();
    }
    public void login(){
        iUserBiz.login(userBaseActivity.getLoginUsername(), userBaseActivity.getLoginUsername(), new OnLoginListener() {
            @Override
            public void loginSuccess() {
                userBaseActivity.startActivity(new Intent(userBaseActivity,DisplayActivity.class));
            }

            @Override
            public void loginFail() {
                Toast.makeText(userBaseActivity, "账号或者密码错误", Toast.LENGTH_SHORT).show();
            }
        });
    }
}