Android Open Source - reactive-android-demo A P I

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License

The source code is released under:

Apache License

Java Source Code

package com.example.listviewdemo.data;
/*w w  w.  j  a v  a  2 s.  c  o  m*/
import java.io.IOException;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import rx.Observable;
import rx.Observer;
import rx.Subscription;
import rx.schedulers.Schedulers;
import rx.subscriptions.Subscriptions;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import com.example.listviewdemo.MLog;
import com.example.listviewdemo.schema.GoogleImageSearchResponse;
import com.google.gson.Gson;

public class API {
  public static String TAG = MLog.tag(API.class);

  public static String SEARCH_URL = "https://ajax.googleapis.com/ajax/services/search/images?v=1.0&q=";

  public static GoogleImageSearchResponse searchImage(String keyword)
      throws ClientProtocolException, IOException {
    String url = SEARCH_URL + keyword;

    // using native way to send request, caller should use RxJava to
    // call this method asynchronously
    HttpClient client = new DefaultHttpClient();
    HttpGet get = new HttpGet(url);
    HttpResponse response = client.execute(get);
    HttpEntity entity = response.getEntity();
    String body = EntityUtils.toString(entity);

    Gson gson = new Gson();
    GoogleImageSearchResponse pool = gson.fromJson(body,
        GoogleImageSearchResponse.class);

    return pool;
  }

  public static Observable<GoogleImageSearchResponse> getImageSearchFetcher(
      final String url) {
    return Observable.create(
        new Observable.OnSubscribeFunc<GoogleImageSearchResponse>() {
          @Override
          public Subscription onSubscribe(
              Observer<? super GoogleImageSearchResponse> observer) {
            try {
              for (int i = 0; i < 3; i++) {
                String pageUrl = String.format(
                    "%s&rsz=8&start=%d", url, 8 * i);
                observer.onNext(API.searchImage(pageUrl));
              }
              observer.onCompleted();
            } catch (Exception e) {
              observer.onError(e);
            }

            return Subscriptions.empty();
          }
        }).subscribeOn(Schedulers.io());
  }

  public static Bitmap getImage(String url) throws ClientProtocolException,
      IOException {
    MLog.d(TAG, "getting " + url);
    // using native way to send request, caller should use RxJava to
    // call this method asynchronously
    HttpClient client = new DefaultHttpClient();
    HttpGet get = new HttpGet(url);
    HttpResponse response = client.execute(get);
    HttpEntity entity = response.getEntity();
    byte[] content = EntityUtils.toByteArray(entity);
    return BitmapFactory.decodeByteArray(content, 0, content.length);
  }

  public static Observable<ListItemImage> getImageFetcher(
      final List<String> urls) {
    return Observable.create(
        new Observable.OnSubscribeFunc<ListItemImage>() {
          @Override
          public Subscription onSubscribe(
              Observer<? super ListItemImage> observer) {
            try {
              for (String url : urls) {
                ListItemImage itemImage = new ListItemImage();
                itemImage.url = url;
                itemImage.bitmap = API.getImage(url);
                observer.onNext(itemImage);
              }
              observer.onCompleted();
            } catch (Exception e) {
              observer.onError(e);
            }

            return Subscriptions.empty();
          }
        }).subscribeOn(Schedulers.io());
  }
}

Java Source Code List

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