MVP初體驗與MVP引入Dagger2初體驗
Mvp模式理解
一、分析Presenter層
1.1 Presenter 注入 實現接口IView的Acticity
public class MainActivity extends AppCompatActivity implements View.OnClickListener, IUserLoginView {
...
private void loadData() {
mLoginPresenter = new LoginPresenter();
mLoginPresenter.attachView(this);
}
...
}
1.2 Presenter 構造中創建Model層
public class LoginPresenter extends BasePresenter<IUserLoginView> {
private LoginTasksRepository mLoginTasksRepository;
public LoginPresenter() {
mLoginTasksRepository = new LoginTasksRepository();
}
Login();--
}
1.3 Presenter 中處理當前Activity中的事件,如登陸事件Login
下圖分析:調用model層方法Login,處理網絡請求,返回結果,view層響應事件
public void login(String loginReq){
mLoginTasksRepository.login(loginReq, new LoginTaskDataSource.NetTasksCallback() {
@Override
public void onSuccess(LoginResponse loginResponse) {
mvpView.hideLoading();
mvpView.onSuccess(loginResponse);
}
@Override
public void onFailure(String errorMsg) {
}
});
}
public abstract class BasePresenter<V extends IMvpView> implements Presenter<V> {
protected V mvpView;
public void attachView(V view){
mvpView = view;
}
@Override
public void detachView(V view) {
mvpView = null;
}
@Override
public String getName() {
return mvpView.getClass().getSimpleName();
}
}
public interface Presenter<V> {
void attachView(V view);
void detachView(V view);
String getName();
}
二、分析Model層
2.1 網絡請求或數據庫存儲
public interface LoginTaskDataSource {
void saveLoginResponse(LoginResponse loginResponse);
void login(String loginReq, NetTasksCallback callback);
interface NetTasksCallback{
void onSuccess(LoginResponse loginResponse);
void onFailure(String errorMsg);
}
}
public class LoginTasksRepository implements LoginTaskDataSource {
@Override
public void saveLoginResponse(LoginResponse loginResponse) {
}
@Override
public void login(String loginReq, NetTasksCallback callback) {
//開啓網絡請求
//成功後
LoginResponse loginResponse = new LoginResponse();
loginResponse.setResultInfo(loginReq+"===登錄成功");
loginResponse.setResultCode("0");
callback.onSuccess(loginResponse);
}
}
三、分析View層
3.1 分析Activity中的具體方法,封裝進接口,在loadData中注入。點擊事件調用P層
public interface IMvpView {
void onError(String errorMsg, String code);
void onSuccess(LoginResponse loginResponse);
void showLoading();
void hideLoading();
}
public interface IUserLoginView extends IMvpView{
void clearEditContent();
}
public class MainActivity extends AppCompatActivity implements View.OnClickListener, IUserLoginView {
private EditText mUsername;
private EditText mPassword;
private Button mLogin;
private LoginPresenter mLoginPresenter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
loadData();
}
private void initView() {
mUsername = (EditText) findViewById(R.id.username);
mPassword = (EditText) findViewById(R.id.password);
mLogin = (Button) findViewById(R.id.login);
mLogin.setOnClickListener(this);
}
private void loadData() {
mLoginPresenter = new LoginPresenter();
mLoginPresenter.attachView(this);
}
@Override
public void onClick(View v) {
mLoginPresenter.login(mUsername.getText().toString() + "-" + mPassword.getText().toString());
}
@Override
public void clearEditContent() {
mUsername.setText("");
mPassword.setText("");
}
@Override
public void onError(String errorMsg, String code) {
}
@Override
public void onSuccess(LoginResponse loginResponse) {
Toast.makeText(this, loginResponse.getResultInfo(), Toast.LENGTH_SHORT).show();
}
@Override
public void showLoading() {
}
@Override
public void hideLoading() {
}
@Override
protected void onDestroy() {
mLoginPresenter.detachView(this);
super.onDestroy();
}
}
3.2 當Destory時,需註銷GC鏈,避免內存泄露
Mvp+ Dagger2模式理解
依賴
apply plugin: 'com.neenbedankt.android-apt'
dependencies:
apt 'com.google.dagger:dagger-compiler:2.2'
compile 'com.google.dagger:dagger:2.2'
一、分析Presenter層
分析:一樣也是P連接 M 和 V
public class MainPresenter implements MainContract.IPresenter {
private MainContract.IModel model;
private MainContract.IView view;
public MainPresenter(MainContract.IView view) {
this.view = view;
this.model = new MainModel();
}
@Override
public void onButtonClicked(Context context, String text) {
model.onButtonClicked(context,text);
}
}
二、mvp接口類
public class MainContract {
interface IView{
void onButtonClicked(String text);
}
interface IModel{
void onButtonClicked(Context context,String text);
}
interface IPresenter{
void onButtonClicked(Context context,String text);
}
}
三、Model層
public class MainModel implements MainContract.IModel {
@Override
public void onButtonClicked(Context context, String text) {
Toast.makeText(context,text,Toast.LENGTH_SHORT).show();
}
}
四、注入接口
@Singleton
@Component(modules = MainModule.class)
public interface MainComponent {
void inject(MainActivity activity);
}
五、引入dagger2模式
分析:對應第六點的注入過程,給V提供P層對象
@Module
public class MainModule {
MainPresenter mPresenter;
public MainModule(MainActivity activity){
mPresenter = new MainPresenter(activity);
}
@Provides
@Singleton
MainPresenter providersMainPresenter(){
return mPresenter;
}
}
六、View
分析:實現IView 接口,DaggerMainComponent注入(相對於MVP少了新建P層,調P層方法注入),點擊調P層
public class MainActivity extends AppCompatActivity implements MainContract.IView {
@Inject
MainPresenter presenter;
@InjectView(R.id.btn)
Button mBtn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.inject(this);
//這步之前需要rebuild一下
DaggerMainComponent.builder().mainModule(new MainModule(MainActivity.this)).build().inject(this);
}
@Override
public void onButtonClicked(String text) {
presenter.onButtonClicked(this,text);
}
@OnClick(R.id.btn)
public void onClick() {
onButtonClicked("Button Clicked!!!");
}
}
兩者之間的比較
簡單的說,單純使用MVP,代碼結構清晰,注入Dagger2後,代碼交接成本高,當然耦合是降低了,個人比較推薦使用MVP的。
感謝
MVP的學習一直都有,最近有時間,做一下總結,方便下個項目的使用,在這裏感謝曹銀飛顧林海等人的博客,對我的幫助挺大的。由於版權申明,不能轉載博客。感謝大大。