RxJava结合ProgressDialog实现请求数据

先看效果图

接下来看代码
1.请求接口

public interface MovieService {
//        @GET("top250")//https://api.douban.com/v2/movie/top250?start=0&count=10
//        Call<MovieInfo> getMovieInfo(@Query("start") int start, @Query("count") int count);
//         @GET("top250")
//         rx.Observable<MovieInfo> getMovieInfo2(@Query("start") int start, @Query("count") int count);
        @GET("top250")
        Observable<HttpResult<List<MovieInfo.SubjectsBean>>> getMovieInfo3(@Query("start") int start, @Query("count") int count);
}

2.ProgressHandler

public class ProgressHandler extends Handler {
    public static final int SHOW_PROGRESS = 0;
    public static final int DISMISS_PROGRESS = 1;
    private ProgressDialog pd;
    private Context mContext;
    private ProgressCancelListener mProgressCancelListener;
    private boolean cancelable;
    public ProgressHandler(Context context, ProgressCancelListener listener,boolean cancelable){
        this.mContext = context;
        mProgressCancelListener = listener;
        this.cancelable = cancelable;
    }
    public void initProgressDialog(){
        if(pd == null){
            pd = new ProgressDialog(mContext);
            pd.setCancelable(cancelable);
            if(cancelable){
                pd.setOnCancelListener(new DialogInterface.OnCancelListener() {
                    @Override
                    public void onCancel(DialogInterface dialog) {
                        mProgressCancelListener.onProgressCanceled();
                    }
                });
            }
            if(!pd.isShowing()){
                pd.show();//显示进度条
            }
        }
    }
    public void dismissProgressDialog(){
        if(pd!=null){
            pd.dismiss();//取消进度条
            pd = null;
        }
    }

    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        switch(msg.what){
            case SHOW_PROGRESS:
                initProgressDialog();
            break;
            case DISMISS_PROGRESS:
                dismissProgressDialog();
            break;
        }
    }
}

3.ProgressSubscribe

public class ProgressSubscribe<T> extends Subscriber<T> implements ProgressCancelListener {

    private SubscribeOnNextListener mOnNextListener;
    private Context mContext;
    private ProgressHandler mProgressHandler;
    public ProgressSubscribe(SubscribeOnNextListener listener, Context context){
        this.mOnNextListener = listener;
        mContext = context;
        mProgressHandler = new ProgressHandler(mContext,this,true);
    }

    public void showProgressDialog(){
        if(mProgressHandler!=null){
            mProgressHandler.obtainMessage(ProgressHandler.SHOW_PROGRESS).sendToTarget();
        }
    }
    public void disMissProgressDialog(){
        if(mProgressHandler!=null){
            mProgressHandler.obtainMessage(ProgressHandler.DISMISS_PROGRESS).sendToTarget();
            mProgressHandler = null;
        }
    }
    @Override
    public void onStart() {
        super.onStart();
        showProgressDialog();
    }

    @Override
    public void onCompleted() {
        disMissProgressDialog();
    }

    @Override
    public void onError(Throwable e) {
      disMissProgressDialog();
    }

    @Override
    public void onNext(Object o) {
        mOnNextListener.onNext(o);//回调MainActivity中的onNext方法
    }

    @Override
    public void onProgressCanceled() {//取消请求
        if(!this.isUnsubscribed()){
            unsubscribe();
        }
    }
}

4.RetrofitClient

public class RetrofitClient {
    private Retrofit mRetrofit;
    private final MovieService mMovieService;

    public RetrofitClient(){
        mRetrofit = new Retrofit.Builder().baseUrl("https://api.douban.com/v2/movie/")
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .build();

        mMovieService = mRetrofit.create(MovieService.class);
    }
    public static RetrofitClient getInstance(){
        return RetrofitHolder.sClient;
    }
    public static class RetrofitHolder{
        private static RetrofitClient sClient = new RetrofitClient();
    }

    public<T> T create(Class<T> clazz){
        return mRetrofit.create(clazz);
    }

// public void getMovieInfo(Subscriber<MovieInfo> subscriber,int start,int count){
// mMovieService.getMovieInfo2(start,count)
// .subscribeOn(Schedulers.io())
// .observeOn(AndroidSchedulers.mainThread())
// .subscribe(subscriber);
// }

    /** * 用来统一处理Htpp的resultCode,并将data部分的数据剥离出来给Subscriber * @param <T> Subscribe真正需要的数据类型 */
     class HttpResultFunc<T> implements Func1<HttpResult<T>,T>{
        @Override
        public T call(HttpResult<T> tHttpResult) {
            if(tHttpResult.resultCode!=0){
// throw new ApiException
            }
            return tHttpResult.subjects;
        }
    }
    public void getMovieInfo(Subscriber<List<MovieInfo.SubjectsBean>> subscriber, int start, int count){
        mMovieService.getMovieInfo3(start,count)
                .map(new HttpResultFunc<List<MovieInfo.SubjectsBean>>())
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(subscriber);
    }

}

5.SubscribeOnNextListener

//接口，用来回调
public interface SubscribeOnNextListener<T> {
    void onNext(T t);
}

6.ProgressCancelListener

//接口，用来取消进度条
public interface ProgressCancelListener {
    void onProgressCanceled();
}

7.MainActivity

public class MainActivity extends AppCompatActivity {
    @Bind(R.id.textview)
    TextView mTextview;
    @Bind(R.id.button)
    Button mButton;

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

    @OnClick(R.id.button)
    public void click() {
        getMovie();
    }

    public void getMovie() {
        RetrofitClient.getInstance().getMovieInfo
                (new ProgressSubscribe<List<MovieInfo.SubjectsBean>>(mOnNextListener,this),0,10);
    }
    SubscribeOnNextListener<List<MovieInfo.SubjectsBean>> mOnNextListener = new SubscribeOnNextListener<List<MovieInfo.SubjectsBean>>() {
        @Override
        public void onNext(List<MovieInfo.SubjectsBean> o) {
            mTextview.setText(o.toString());
        }
    };
}