Mvp+Retrofit+Rxjava+RxLifecycle的封装和使用

添加依赖

    compile 'com.squareup.retrofit2:retrofit:2.3.0'
    compile 'com.squareup.retrofit2:converter-gson:2.3.0'
    compile 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'
    compile 'com.squareup.okhttp3:logging-interceptor:3.8.0'
    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
    compile 'com.trello.rxlifecycle2:rxlifecycle-components:2.1.0'

​ 使用RxLifeCycle是因为在使用Rxjava的过程中,当发布一个订阅后,页面被finsh,此时订阅的逻辑还没完成,容易引发内存泄漏的问题.

准备base类

1.在BaseActivity中继承RxAppCompatActivity

public class BaseActivity extends RxAppCompatActivity {
}

2.在BasePresenter中写拿到LifecycleProvider的方法,方便后边的RetrofitService设置手动关闭订阅.

public class BasePresenter {

    private LifecycleProvider provider;

    public BasePresenter(LifecycleProvider provider) {
        this.provider = provider;
    }

    public LifecycleProvider getProvider() {
        return provider;
    }
}

当我们在activity中初始化presenter的时候,由于activity继承的RxAppCompatActivity,只需要传this就可以把LifecycleProvider传过来了.

3.使用mvp,需要新建抽象类BaseView

public interface BaseView {

    /**
     * 显示Loading
     */
    void showProgressDialog();

    /**
     * 隐藏Loading
     */
    void hideProgressDialog();

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

准备接口地址类和请求参数接口类

1.新建接口地址类Constant

public class Constant {

    /**
     * 服务器地址(基类地址)
     */
    public static final String SERVER_URL = "http://www.kuaidi100.com/";

    /**
     * 接口请求地址
     */
    public static class UrlOrigin {

      //--------------------------------------------------
      //拼接的尾部地址都写下边
        /**
         * 获取快递信息
         */
        public static final String get_express_info = "query";
    }
}

2.新建请求参数接口类RetrofitService

public interface RetrofitService {

    /**
     * 获取快递信息
     * Rx方式
     * @return Observable
     */
    @GET(Constant.UrlOrigin.get_express_info)
    Observable getExpressInfoRx(@QueryMap Map map);
}

​ 注意: @GET(Constant.UrlOrigin.get_express_info)括号中的参数为Constant的尾部地址”query”.

准备Retrofit工具类

1.新建RetrofitHelper

​ 初始化Retrofit基础配置.

public class RetrofitHelper {

    private static RetrofitHelper retrofitHelper;
    private RetrofitService retrofitService;

    public static RetrofitHelper getInstance() {
        return retrofitHelper == null ? retrofitHelper = new RetrofitHelper() : retrofitHelper;
    }

    private RetrofitHelper() {
        // 初始化Retrofit
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(Constant.SERVER_URL)
                .addConverterFactory(GsonConverterFactory.create()) // json解析
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create()) // 支持RxJava
                .client(RetrofitUtils.getOkHttpClient()) //打印请求参数
                .build();
        retrofitService = retrofit.create(RetrofitService.class);
    }

    public RetrofitService getRetrofitService() {
        return retrofitService;
    }
}

​ 可以通过getRetrofitService()方法,拿到RetrofitService对象,进而调接口.

2.新建DataManager

​ 数据处理.

public class DataManager {

    private static DataManager dataManager;
    private RetrofitService retrofitService;

    public static DataManager getInstance() {
        return dataManager == null ? dataManager = new DataManager() : dataManager;
    }

    /**
     * 初始化Retrofit,拿到RetrofitService
     */
    private DataManager() {
        retrofitService = RetrofitHelper.getInstance().getRetrofitService();
    }

  //---------------------------------------------------------
  //从下边开始,就是各个接口的请求
    /**
     * 获取快递信息
     * @return Observable
     */
    public Observable getExpressInfo(Map map) {
        return retrofitService.getExpressInfoRx(map);
    }
}

​ 在DataManager中初始化RetrofitHelper,并通过RetrofitHelper重的getRetrofitService()方法拿到RetrofitService.

​ 然后在DataManager中做网络请求,返回拿到的javabean,如上面代码中的getExpressInfo()方法.

开始使用

1.要使用mvp,需要新建抽象类ExpressView

public interface ExpressView extends BaseView {

    /**
     * 更新UI
     *
     * @param expressInfo 快递信息
     */
    void updateView(ExpressInfo expressInfo);
}

ExpressView在presenter中设置,然后在activity中实现ExpressView,在回调updateView()中拿到javabean数据,然后做数据绑定等操作.

2.在MainActivity中

public class MainActivity extends BaseActivity implements ExpressView {

    @BindView(R.id.tv_post_info)
    TextView tvPostInfo;

    private ProgressDialog progressDialog;
    private ExpressPresenter expressPresenter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        expressPresenter = new ExpressPresenter(this, this);
        progressDialog = new ProgressDialog(this);
        progressDialog.setMessage("正在获取快递信息...");
    }

    @OnClick(R.id.btn_get_post_info)
    public void onViewClicked() {
        Map map = new HashMap<>();
        map.put("type","yuantong");
        map.put("postid","11111111111");
       //开始做数据请求
        expressPresenter.getExpressInfo(map);
    }

    /**
     * 拿到数据,做数据绑定操作
     *
     * @param expressInfo 快递信息
     */
    @Override
    public void updateView(ExpressInfo expressInfo) {
        tvPostInfo.setText(expressInfo.toString());
    }

    /**
     * 数据请求时的
     * 显示加载框
     */
    @Override
    public void showProgressDialog() {
        progressDialog.show();
    }

    /**
     * 数据加载完成的隐藏加载框
     */
    @Override
    public void hideProgressDialog() {
        progressDialog.hide();
    }

    /**
     * 显示错误信息
     * @param msg 错误信息
     */
    @Override
    public void showError(String msg) {
        Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
    }
}

3.新建presenter类ExpressPresenter

public class ExpressPresenter extends BasePresenter {

    private ExpressView expressView;
    private DataManager dataManager;

    public ExpressPresenter(ExpressView expressView, LifecycleProvider provider) {
        super(provider);
        this.expressView = expressView;
        dataManager = DataManager.getInstance();
    }

    /**
     * 获取快递信息
     */
    public void getExpressInfo(Map map) {
        expressView.showProgressDialog();

        dataManager.getExpressInfo(map)
                .subscribeOn(Schedulers.io()) // 在子线程中进行Http访问
                .observeOn(AndroidSchedulers.mainThread()) // UI线程处理返回接口
                .compose(getProvider().bindUntilEvent(ActivityEvent.DESTROY)) // onDestroy取消订阅
                .subscribe(new DefaultObserver() {  // 订阅
                    @Override
                    public void onNext(@NonNull ExpressInfo expressInfo) {
                        expressView.updateView(expressInfo);
                    }

                    @Override
                    public void onError(@NonNull Throwable e) {
                        expressView.showError(e.getMessage());
                        expressView.hideProgressDialog();
                    }

                    @Override
                    public void onComplete() {
                        expressView.hideProgressDialog();
                    }
                });
    }
}

注意:RxLifeCircle的手动/自动关闭代码就是在compose()中,关于RxLifeCircle请关注我写的RxLifeXCircle详解

最后

​ 好了,以后只需要在Constant里新加接口地址,在RetrofitService新加请求参数,在DataManager中新建个方法,请求网络,返回Observable.

​ 然后在presenter中的getExpressInfo()方法中,dataManager.get DataManger的请求网络的方法.

本文的demo地址:http://download.csdn.net/download/huchengzhiqiang/10032097