Android 知识杂记（MVP模式）

MVP的模式在于将原来activity中业务逻辑的部分剥离出来，代码示例如下：

• Account

public class Account {
    
    private String mUsername;
    private String mPassword;
        
    public String getmUsername() {
        return mUsername;
    }
    public void setmUsername(String mUsername) {
        this.mUsername = mUsername;
    }
    public String getmPassword() {
        return mPassword;
    }
    public void setmPassword(String mPassword) {
        this.mPassword = mPassword;
    }
}

• IAccountModel

public interface IAccountModel {
    
    void setAccount(String username, String password);
    Account getAccount();
}

• AccountModel

public class AccountModel implements IAccountModel {
    
    private Account mAccount;
    
    public AccountModel(){
        mAccount = new Account();
    }

    @Override
    public void setAccount(String username, String password) {
        mAccount.setmUsername(username);
        mAccount.setmPassword(password);        
    }

    @Override
    public Account getAccount() {
        return mAccount;
    }
}

• AccountPresenter

public class AccountPresenter {
    private IAccountModel mAccountModel;
    private IAccountView mAccountView;
    
    //view的实现还是在activity中
    public AccountPresenter(IAccountView view){
        mAccountView = view;
        mAccountModel = new AccountModel();
    }
    
    //初始化账号显示，该业务逻辑被封装在presenter中
    public void initAccount(String username, String password){
        mAccountModel.setAccount(username, password);
        mAccountView.setUsernameEdit(mAccountModel.getAccount().getmUsername());
        mAccountView.setPasswordEdit(mAccountModel.getAccount().getmPassword());
    }
}

•  IAccountView

public interface IAccountView {
    public void setUsernameEdit(String username);
    public void setPasswordEdit(String password);
}

• MainActivity

public class MainActivity extends Activity implements IAccountView{
    
    private EditText mUsername;
    private EditText mPassword;
    private AccountPresenter mAccountPresenter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mUsername = (EditText) findViewById(R.id.username);
        mPassword = (EditText) findViewById(R.id.password);
        
        mAccountPresenter = new AccountPresenter(this);
        mAccountPresenter.initAccount("fredric", "fredricpassword");
    }

    @Override
    public void setUsernameEdit(String username) {
        mUsername.setText(username);
    }

    @Override
    public void setPasswordEdit(String password) {
        mPassword.setText(password);
    }    
}