Android Open Source - reactive-android-demo Search Result Adapter

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License

The source code is released under:

Apache License

Java Source Code

package com.example.listviewdemo;
//from   w w w.j  av a  2 s.  c o m
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import rx.Observable;
import rx.Observer;
import rx.Subscription;
import rx.android.observables.AndroidObservable;

import com.example.listviewdemo.data.API;
import com.example.listviewdemo.data.ListItemImage;
import com.example.listviewdemo.schema.GoogleImageSearchResponse;
import com.example.listviewdemo.schema.Result;

import android.app.Activity;
import android.graphics.Bitmap;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class SearchResultAdapter extends ArrayAdapter<Result> {
  private final Activity mContext;
  private List<Result> mData = new ArrayList<Result>();

  private Subscription mAdapterDataSubscription;

  private Subscription mListItemImageSubscription;

  // TODO: replace with FIFO Cache for better memory performance here
  private Map<String, Bitmap> mImages = new HashMap<String, Bitmap>();

  static class ViewHolder {
    public TextView title;
    public TextView content;
    public ImageView image;
  }

  public SearchResultAdapter(Activity context) {
    super(context, R.layout.listitem_searchresult);
    this.mContext = context;
  }

  @Override
  public int getCount() {
    return mData.size();
  }

  public void doSearch(String keyword) {
    mData.clear();
    mImages.clear();

    Observable<GoogleImageSearchResponse> mImageSerachObservable = API
        .getImageSearchFetcher(API.SEARCH_URL);
    mAdapterDataSubscription = AndroidObservable.fromActivity(mContext,
        mImageSerachObservable).subscribe(mAdapterDataObserver);

    // mImageSerachObservable.subscribe();
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    View view = convertView;
    if (view == null) {
      LayoutInflater inflater = ((Activity) mContext).getLayoutInflater();
      view = inflater.inflate(R.layout.listitem_searchresult, null);
      ViewHolder viewHolder = new ViewHolder();
      viewHolder.title = (TextView) view
          .findViewById(R.id.search_result_title);
      viewHolder.content = (TextView) view
          .findViewById(R.id.search_result_content);
      viewHolder.image = (ImageView) view
          .findViewById(R.id.search_result_image);
      view.setTag(viewHolder);
    }

    ViewHolder holder = (ViewHolder) view.getTag();
    Result r = mData.get(position);
    holder.title.setText(r.getTitleNoFormatting());
    holder.content.setText(r.getContentNoFormatting());

    String url = mData.get(position).getUrl();
    if (mImages.get(url) != null)
      holder.image.setImageBitmap(mImages.get(url));

    return view;
  }

  private Observer<GoogleImageSearchResponse> mAdapterDataObserver = new Observer<GoogleImageSearchResponse>() {
    @Override
    public void onCompleted() {
      mAdapterDataSubscription.unsubscribe();

      // initialize and launch image download process
      List<String> urls = new ArrayList<String>(mData.size());
      for (Result r : mData) {
        String url = r.getUrl();
        if (!mImages.containsKey(url)) {
          urls.add(url);
          mImages.put(url, null);
        }
      }

      Observable<ListItemImage> mImageFetcherObservable = API
          .getImageFetcher(urls);
      mListItemImageSubscription = AndroidObservable.fromActivity(
          mContext, mImageFetcherObservable).subscribe(
          mListItemImageObserver);
    }

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

    @Override
    public void onNext(GoogleImageSearchResponse response) {
      List<Result> results = response.getResponseData().getResults();
      mData.addAll(results);
      notifyDataSetChanged();
    }
  };

  private Observer<ListItemImage> mListItemImageObserver = new Observer<ListItemImage>() {
    @Override
    public void onCompleted() {
      // mListItemImageSubscription.unsubscribe();
    }

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

    @Override
    public void onNext(ListItemImage itemImage) {
      mImages.put(itemImage.url, itemImage.bitmap);
      notifyDataSetChanged();
    }
  };

}

Java Source Code List

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