小试Android中使用MVC框架模式

 1 /**
 2  * Author：ProdigalWang
 3  * Time: 2016/9/26
 4  * 视图层,直接展示给用户。通过视图层将数据请求传送到控制层(Controller)
 5  * 作为视图层来说,它只是作为接受用户数据和展示数据的方式
 6  */
 7 public class LoginView extends LinearLayout {
 8 
 9     private Context mContext;
10     private EditText mUsername;
11     private EditText mPassword;
12     private Button mLoginBtn;
13 
14     public LoginView(Context context, AttributeSet attrs) {
15         super(context, attrs);
16         mContext = context;
17     }
18 
19     public void initView() {
20         mUsername = (EditText) findViewById(R.id.et_name_mvc);
21         mPassword = (EditText) findViewById(R.id.et_pwd_mvc);
22         mLoginBtn = (Button) findViewById(R.id.bt_login_mvc);
23     }
24 
25     public String getName() {
26         return mUsername.getText().toString();
27     }
28 
29     public String getPwd() {
30         return mPassword.getText().toString();
31     }
32 
33     public void setOnclikLister(OnClickListener onclikLister) {
34         mLoginBtn.setOnClickListener(onclikLister);
35     }
36 
37     public void userNameEpty() {
38         Toast.makeText(mContext, "用户名不能为空", Toast.LENGTH_SHORT).show();
39     }
40 
41     public void passWordEpty() {
42         Toast.makeText(mContext, "密码不能为空", Toast.LENGTH_SHORT).show();
43     }
44 
45     public void userNameError() {
46         Toast.makeText(mContext, "用户名错误", Toast.LENGTH_SHORT).show();
47     }
48 
49     public void passWordError() {
50         Toast.makeText(mContext, "密码错误", Toast.LENGTH_SHORT).show();
51     }
52 
53     public void loginSuccess() {
54         Toast.makeText(mContext, "登录成功", Toast.LENGTH_SHORT).show();
55     }
56 
57     public void loginFailure() {
58         Toast.makeText(mContext, "登录失败", Toast.LENGTH_SHORT).show();
59     }
60 }

/**
 * 模型层———登录接口
 */

public interface ILoginModel {

    void login(String name, String pwd, LoginCallBack loginCallBack);
}

/**
 * Author：ProdigalWang
 * Time: 2016/9/26
 * 模型层实现,完成具体的数据操作。
 */

public class LoginModelImpl implements ILoginModel {

    private MyDataBaseHelper myDataBaseHelper;

    @Override
    public void login(String name, String pwd, LoginCallBack loginCallBack) {

        User user=new User();
        user.setName(name);
        user.setPwd(pwd);

        myDataBaseHelper = new MyDataBaseHelper(MyAppliction.getContext(), "Login.db", null, 1);

        int result = myDataBaseHelper.queryData(user);

        //发出处理结果，用户得到反馈
        if (result == 1) {

            loginCallBack.success(user);
        } else {
            loginCallBack.fail(result);
        }
    }
}

/**
 * Author：ProdigalWang
 * Time: 2016/9/26
 */
public class LoginController implements View.OnClickListener {

    private LoginView loginView;
    private ILoginModel iLoginModel;

    public LoginController( LoginView loginView){
        this.loginView=loginView;

        iLoginModel=new LoginModelImpl();
    }
    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.bt_login_mvc:
                String username=loginView.getName();
                String pwd=loginView.getPwd();

                if (TextUtils.isEmpty(username)){
                    loginView.userNameEpty();
                    break;
                }
                if (TextUtils.isEmpty(pwd)){
                    loginView.passWordEpty();
                    break;
                }
                //调用模型层去处理具体的请求
                iLoginModel.login(username, pwd, new LoginCallBack() {
                    @Override
                    public void success(User user) {
                        loginView.loginSuccess();
                    }

                    @Override
                    public void fail(int status) {
                        if (status==0){
                            //模型层完成数据处理后,通知视图层做出相应的改变。用户得到反馈。
                            loginView.passWordError();
                        }else if (status==-1){
                            loginView.userNameError();
                        }else {
                            loginView.loginFailure();
                        }
                    }

                });
                break;
        }
    }
}

**
 * 此时Activity就变为了承载视图层的容器。
 */
public class MvcLoginActivity extends AppCompatActivity {

    private MyDataBaseHelper myDataBaseHelper;
    private SQLiteDatabase db;

    private LoginView loginView;
    private LoginController loginController;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mvc_login);

        //初始化一个本地用户用来模拟登陆。
        myDataBaseHelper = new MyDataBaseHelper(this, "Login.db", null, 1);
        db = myDataBaseHelper.getWritableDatabase();
       //myDataBaseHelper.initData(db);

       MVC();
    }

   private void MVC(){
        //控件初始化和绑定
        loginView= (LoginView) findViewById(R.id.activity_login_mvc);
        loginView.initView();

        loginController=new LoginController(loginView);//视图层结合控制层
        loginView.setOnclikLister(loginController);
    }
}