RxJava+Retrofit+MVP

最新推荐文章于 2024-12-26 10:52:01 发布

原创最新推荐文章于 2024-12-26 10:52:01 发布 · 263 阅读

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本文介绍如何使用RxJava和Retrofit框架进行网络数据的异步加载，并通过示例代码展示了具体的实现过程，包括依赖引入、接口定义、数据模型、Presenter层逻辑处理等。

导依赖

    compile 'io.reactivex.rxjava2:rxjava:2.1.7'
    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
    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'

请求工具

public interface ApiService {
    @GET("93app/data.do")
    Flowable<NewsBean<List<MsgBean>>>getNews(@QueryMap Map<String,String> map);
}

RetrofitUtils

public class RetrofitUtils {
    private static volatile RetrofitUtils instance;
    private final ApiService apiService;

    private RetrofitUtils(String url) {
        Retrofit retrofit = new Retrofit.Builder()
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .baseUrl(url)
                .build();
        apiService = retrofit.create(ApiService.class);
    }
    public static RetrofitUtils getInstance(String url){
        if (instance==null){
            synchronized (RetrofitUtils.class){
                if (instance==null){
                    instance=new RetrofitUtils(url);
                }
            }
        }
        return instance;
    }
    public ApiService getApiService(){
        return apiService;
    }
}

model层接口

public interface IModel {
    void getData(Map<String,String> map,String url);
}

model获取数据

public class NewModel implements IModel {
    private NewsPresenter newsPresenter;
    public NewModel(NewsPresenter newsPresenter){
        this.newsPresenter=newsPresenter;
    }
    @Override
    public void getData(Map<String, String> map, String url) {
        Flowable<NewsBean<List<MsgBean>>> flowable = RetrofitUtils.getInstance(url).getApiService().getNews(map);
        newsPresenter.getNews(flowable);
    }
}

presenter层接口

public interface BasePresenter {
    void getData(Map<String,String> map,String url);
}

presenter逻辑操作

public class NewsPresenter implements BasePresenter{
    private IView iView;
    private DisposableSubscriber subscriber;

    public void attachView(IView iView){
        this.iView=iView;
    }
    public void detachView(){
        if (iView!=null){
            iView=null;
        }
        if (subscriber!=null){
            if (!subscriber.isDisposed()){
                subscriber.dispose();
            }
        }
    }
    public void getNews(Flowable<GoodsBean> flowable){
        subscriber = (DisposableSubscriber)flowable.subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribeWith(new DisposableSubscriber<GoodsBean>() {
                    @Override
                    public void onNext(GoodsBean listNewsBean) {
//                        if (listNewsBean != null) {
                                iView.onSuccessed(listNewsBean);
//                        }
                    }

                    @Override
                    public void onError(Throwable t) {
                        iView.onFailed(new Exception(t));
                        Log.e(TAG, "onNext: "+t );
                    }

                    @Override
                    public void onComplete() {

                    }
                });
    }

    @Override
    public void getData(Map<String, String> map, String url) {
        NewModel model = new NewModel(this);
        model.getData(map,url);
    }
}

View层接口

public interface IView {
    void onSuccessed(NewsBean<List<MsgBean>> listNewsBean);
    void onFailed(Exception e);
}

View层展示数据

public class MainActivity extends AppCompatActivity implements IView {

    private RecyclerView recyclerView;
    private RVAdapter adapter;
    private NewsPresenter presenter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getSupportActionBar().hide();
        Fresco.initialize(this);
        setContentView(R.layout.activity_main);
        recyclerView = (RecyclerView) findViewById(R.id.rv);
        //初始化数据
        getData();
    }
    //初始化数据
    private void getData() {
        HashMap<String, String> map = new HashMap<>();
        map.put("channelId","0");
        map.put("startNum","0");
        presenter = new NewsPresenter();
        presenter.attachView(this);
        presenter.getData(map,"http://www.93.gov.cn/");
    }

    /**
     * 成功方法
     * @param listNewsBean
     */
    @Override
    public void onSuccessed(NewsBean<List<MsgBean>> listNewsBean) {
        List<MsgBean> data = listNewsBean.getData();
        LinearLayoutManager manager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(manager);
        adapter = new RVAdapter(MainActivity.this,data);
        recyclerView.setAdapter(adapter);

    }

    @Override
    public void onFailed(Exception e) {

    }

    /**
     * 防止内存泄漏
     */
    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (presenter!=null){
            presenter.detachView();
        }
    }
}

recycleview子布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:fresco="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:padding="20dp"
    android:layout_height="match_parent">
    <com.facebook.drawee.view.SimpleDraweeView
        android:id="@+id/img_logo"
        android:layout_alignParentRight="true"
        fresco:roundAsCircle="true"
        android:layout_width="70dp"
        android:layout_height="70dp" />

    <TextView
        android:id="@+id/tv_title"
        android:layout_width="match_parent"
        android:textSize="22dp"
        android:text="标题"
        android:layout_toLeftOf="@id/img_logo"
        android:layout_height="70dp" />

</RelativeLayout>

recycleview适配器

public class RVAdapter extends RecyclerView.Adapter<RVAdapter.ViewHolder>{
    private Context context;
    private List<MsgBean> data;

    public RVAdapter(Context context, List<MsgBean> data) {
        this.context = context;
        this.data = data;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = View.inflate(context, R.layout.item, null);
        ViewHolder holder = new ViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.tvTitle.setText(data.get(position).getTitle());
        holder.imgLogo.setImageURI(data.get(position).getImageUrl());
    }

    @Override
    public int getItemCount() {
        return data.size();
    }

    class ViewHolder extends RecyclerView.ViewHolder{

        private final TextView tvTitle;
        private final SimpleDraweeView imgLogo;

        public ViewHolder(View itemView) {
            super(itemView);
            tvTitle = (TextView) itemView.findViewById(R.id.tv_title);
            imgLogo = (SimpleDraweeView) itemView.findViewById(R.id.img_logo);
        }
    }
}

此框架暂不完美，Loading...