【Android架构】基于MVP模式的Retrofit2+RXjava封装(一)

#最近有个新项目要做,搭建框架的时候,顺便梳理了下MVP模式,特此记录,欢迎大家指正。

项目地址GitHub

一 、首先是依赖

    compile 'com.google.code.gson:gson:2.8.0'
    compile 'com.squareup.okhttp3:okhttp:3.4.1'
    compile 'com.yanzhenjie:permission:1.0.5'
    compile 'com.squareup.retrofit2:retrofit:2.3.0'
    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
    compile 'io.reactivex.rxjava2:rxjava:2.1.5'
    //ConverterFactory的String依赖包
    compile 'com.squareup.retrofit2:converter-scalars:2.3.0'
    //ConverterFactory的Gson依赖包
    compile 'com.squareup.retrofit2:converter-gson:2.3.0'
    //CallAdapterFactory的Rx依赖包
    compile 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'

二、ApiServer,定义了一些接口

public interface ApiServer {
    @POST("shopping_login.htm")
    Observable LoginByRx(@Field("username") String username, @Field("password") String password);

}

三、ApiRetrofit,初始化Retrofit、OkHttpClient,加入了拦截器

public class ApiRetrofit {

    public final String BASE_SERVER_URL = "https://wawa-api.vchangyi.com/";

    private static ApiRetrofit apiRetrofit;
    private Retrofit retrofit;
    private OkHttpClient client;
    private ApiServer apiServer;

    private String TAG = "ApiRetrofit";

    /**
     * 请求访问quest
     * response拦截器
     */
    private Interceptor interceptor = new Interceptor() {
        @Override
        public Response intercept(Chain chain) throws IOException {
            Request request = chain.request();
            long startTime = System.currentTimeMillis();
            Response response = chain.proceed(chain.request());
            long endTime = System.currentTimeMillis();
            long duration = endTime - startTime;
            MediaType mediaType = response.body().contentType();
            String content = response.body().string();
            Log.e(TAG, "----------Request Start----------------");
            Log.e(TAG, "| " + request.toString() + request.headers().toString());
            Log.e(TAG, "| Response:" + content);
            Log.e(TAG, "----------Request End:" + duration + "毫秒----------");
            return response.newBuilder()
                    .body(ResponseBody.create(mediaType, content))
                    .build();
        }
    };


    public ApiRetrofit() {
        client = new OkHttpClient.Builder()
                //添加log拦截器
                .addInterceptor(interceptor)
                .connectTimeout(10, TimeUnit.SECONDS)
                .readTimeout(10, TimeUnit.SECONDS)
                .build();

        retrofit = new Retrofit.Builder()
                .baseUrl(BASE_SERVER_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .addConverterFactory(ScalarsConverterFactory.create())
                //支持RxJava2
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .client(client)
                .build();

        apiServer = retrofit.create(ApiServer.class);
    }

    public static ApiRetrofit getInstance() {
        if (apiRetrofit == null) {
            synchronized (Object.class) {
                if (apiRetrofit == null) {
                    apiRetrofit = new ApiRetrofit();
                }
            }
        }
        return apiRetrofit;
    }

    public ApiServer getApiService() {
        return apiServer;
    }

}

四、基类

1.BaseView,其中定义了常用的接口

public interface BaseView {
    /**
     * 显示dialog
     */
    void showLoading();

    /**
     * 隐藏 dialog
     */

    void hideLoading();

    /**
     * 显示错误信息
     *
     * @param msg
     */
    void showError(String msg);

    /**
     * 错误码
     */
    void onErrorCode(BaseModel model);
}

2.BaseModel

public class BaseModel implements Serializable {
    private int errcode;
    private String errmsg;
    private T result;

    public int getErrcode() {
        return errcode;
    }

    public void setErrcode(int errcode) {
        this.errcode = errcode;
    }

    public String getErrmsg() {
        return errmsg;
    }

    public void setErrmsg(String errmsg) {
        this.errmsg = errmsg;
    }

    public T getResult() {
        return result;
    }

    public void setResult(T result) {
        this.result = result;
    }
}

3.BasePresenter

public class BasePresenter {

    private CompositeDisposable compositeDisposable;


    public V baseView;

    protected ApiServer apiServer = ApiRetrofit.getInstance().getApiService();

    public BasePresenter(V baseView) {

        this.baseView = baseView;
    }

    /**
     * 解除绑定
     */
    public void detachView() {
        baseView = null;
        removeDisposable();
    }

    /**
     * 返回 view
     *
     * @return
     */
    public V getBaseView() {
        return baseView;
    }


    public void addDisposable(Observable observable, BaseObserver observer) {
        if (compositeDisposable == null) {
            compositeDisposable = new CompositeDisposable();
        }
        compositeDisposable.add(observable.subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribeWith(observer));


    }

    public void removeDisposable() {
        if (compositeDisposable != null) {
            compositeDisposable.dispose();
        }
    }

}

4.BaseObserver,主要处理了常见的错误

public abstract class BaseObserver extends DisposableObserver {
    protected BaseView view;
    /**
     * 解析数据失败
     */
    public static final int PARSE_ERROR = 1001;
    /**
     * 网络问题
     */
    public static final int BAD_NETWORK = 1002;
    /**
     * 连接错误
     */
    public static final int CONNECT_ERROR = 1003;
    /**
     * 连接超时
     */
    public static final int CONNECT_TIMEOUT = 1004;


    public BaseObserver(BaseView view) {
        this.view = view;
    }

    @Override
    protected void onStart() {
        if (view != null) {
            view.showLoading();
        }
    }

    @Override
    public void onNext(T o) {
        try {
            BaseModel model = (BaseModel) o;
            if (model.getErrcode() == 0) {
                onSuccess(o);
            } else {
                if (view != null) {
                    view.onErrorCode(model);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            onError(e.toString());
        }


    }

    @Override
    public void onError(Throwable e) {
        if (view != null) {
            view.hideLoading();
        }
        if (e instanceof HttpException) {
            //   HTTP错误
            onException(BAD_NETWORK);
        } else if (e instanceof ConnectException
                || e instanceof UnknownHostException) {
            //   连接错误
            onException(CONNECT_ERROR);
        } else if (e instanceof InterruptedIOException) {
            //  连接超时
            onException(CONNECT_TIMEOUT);
        } else if (e instanceof JsonParseException
                || e instanceof JSONException
                || e instanceof ParseException) {
            //  解析错误
            onException(PARSE_ERROR);
        } else {
            if (e != null) {
                onError(e.toString());
            } else {
                onError("未知错误");
            }
        }

    }

    private void onException(int unknownError) {
        switch (unknownError) {
            case CONNECT_ERROR:
                onError("连接错误");
                break;

            case CONNECT_TIMEOUT:
                onError("连接超时");
                break;

            case BAD_NETWORK:
                onError("网络问题");
                break;

            case PARSE_ERROR:
                onError("解析数据失败");
                break;

            default:
                break;
        }
    }


    @Override
    public void onComplete() {
        if (view != null) {
            view.hideLoading();
        }

    }
    public abstract void onSuccess(T o);

    public abstract void onError(String msg);
}

5.BaseActivity,实现BaseView,处理了Presenter的生命周期。

public abstract class BaseActivity

extends AppCompatActivity implements BaseView { public Context context; private ProgressDialog dialog; public Toast toast; protected P presenter; protected abstract P createPresenter(); protected abstract int getLayoutId(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); context = this; setContentView(getLayoutId()); presenter = createPresenter(); initView(); initData(); } public void initData() { } public void initView() { } @Override protected void onDestroy() { super.onDestroy(); if (presenter != null) { presenter.detachView(); } } /** * @param s */ public void showtoast(String s) { if (toast == null) { toast = Toast.makeText(getApplicationContext(), s, Toast.LENGTH_LONG); } toast.show(); } private void closeLoadingDialog() { if (dialog != null && dialog.isShowing()) { dialog.dismiss(); } } private void showLoadingDialog() { if (dialog == null) { dialog = new ProgressDialog(context); } dialog.setCancelable(false); dialog.show(); } @Override public void showLoading() { showLoadingDialog(); } @Override public void hideLoading() { closeLoadingDialog(); } @Override public void showError(String msg) { showtoast(msg); } @Override public void onErrorCode(BaseModel model) { } @Override public void showLoadingFileDialog() { showFileDialog(); } @Override public void hideLoadingFileDialog() { hideFileDialog(); } @Override public void onProgress(long totalSize, long downSize) { if (dialog != null) { dialog.setProgress((int) (downSize * 100 / totalSize)); } } }

五、如上,框架已经搭建好了,让我们来看看在实际项目中怎么用。

我们来模拟登陆

1.定义LoginView 继承于BaseView

public interface LoginView extends BaseView {
    void onLoginSucc();
}

2.定义LoginPresenter 继承于BasePresenter

public class LoginPresenter extends BasePresenter {
    public LoginPresenter(LoginView baseView) {
        super(baseView);
    }

    public void login(String name, String pwd) {

        addDisposable(apiServer.LoginByRx(name, pwd), new BaseObserver(baseView) {
            @Override
            public void onSuccess(Object o) {
                baseView.onLoginSucc();

            }

            @Override
            public void onError(String msg) {
                baseView.showError(msg);

            }
        });
    }
}

3.LoginActivity 中使用

public class LoginActivity extends BaseActivity implements LoginView {

    private AutoCompleteTextView mEmailView;
    private EditText mPasswordView;

    @Override
    protected LoginPresenter createPresenter() {
        return new LoginPresenter(this);
    }

    @Override
    protected int getLayoutId() {
        return R.layout.activity_login;
    }

    @Override
    public void initView() {
        mEmailView = (AutoCompleteTextView) findViewById(R.id.email);
        mPasswordView = (EditText) findViewById(R.id.password);
        Button mEmailSignInButton = (Button) findViewById(R.id.email_sign_in_button);
        mEmailSignInButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                //示例代码,示例接口
                presenter.login(mEmailView.getText().toString(), mPasswordView.getText().toString());

            }
        });
    }

    @Override
    public void onLoginSucc() {
        //Login Succ

        showtoast("登录成功");

    }
}

总结:以上就是MVP的实现,MVP的框架很多,适合自己就好。

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