Android Open Source - mobcomp-httpclient Image Loader

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License

The source code is released under:

Written by: Markus Tacker <m@coderbyheart.de> | http://coderbyheart.de/ Copyright (c) Markus Tacker Permission is hereby granted, free of charge, to any person obtaining a copy of this software and ...

Java Source Code

package de.hsrm.mi.mobcomp.httpclientdemo.flickr;
/*from  w  ww . ja v a  2  s .  c o m*/
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.net.Uri;
import android.os.Environment;
import android.util.Log;
import de.hsrm.mi.mobcomp.httpclientdemo.extra.ParameterRunnable;
import de.hsrm.mi.mobcomp.httpclientdemo.extra.IdFile;
import de.hsrm.mi.mobcomp.httpclientdemo.flickr.SizesReader.Size;

/**
 * Ldet Bilder via der {@link RestAPI flickr-API} herunter und speichert diese
 * auf der SD-Karte
 * 
 * @author Markus Tacker <m@coderbyheart.de>
 */
public class ImageLoader implements Runnable {

  private RestAPI flickr;
  private String id;
  private ParameterRunnable<IdFile> onComplete;

  public ImageLoader(RestAPI flickr, String id,
      ParameterRunnable<IdFile> extraRunnable) {
    this.flickr = flickr;
    this.id = id;
    this.onComplete = extraRunnable;
  }

  /**
   * Ldt die Infos zu den verschiedenen Gren eines flickr-Photos herunter und speichert das Quadratische Thumbnail.
   * Anschlieend wird das onComplete-Runnable ausgefhrt
   */
  @Override
  public void run() {
    Uri sizesUri = flickr.getPhotoSizes(id);
    HttpClient client = new DefaultHttpClient();
    HttpGet request = new HttpGet(sizesUri.toString());
    try {
      HttpResponse response = client.execute(request);

      StatusLine status = response.getStatusLine();
      if (status.getStatusCode() != 200) {
        throw new IOException("Invalid response from server: "
            + status.toString());
      }

      HttpEntity entity = response.getEntity();
      InputStream inputStream = entity.getContent();
      ByteArrayOutputStream content = new ByteArrayOutputStream();
      int readBytes = 0;
      byte[] sBuffer = new byte[512];
      while ((readBytes = inputStream.read(sBuffer)) != -1) {
        content.write(sBuffer, 0, readBytes);
      }
      String dataAsString = new String(content.toByteArray());

      SizesReader sr = new SizesReader(id);
      ArrayList<Size> sizes = sr.getSizes(dataAsString);
      for (Size s : sizes) {
        if (s.type.equals(RestAPI.SIZE_SQUARE)) {
          onComplete.getParameter().setFile(fetchImage(s.source));
          onComplete.run();
        }
      }
    } catch (IOException e) {
      Log.e(getClass().getCanonicalName(), e.toString());
      Log.e(getClass().getCanonicalName(), e.getMessage());
    }
  }

  /**
   * @todo Not covered here: Check if external storage is available, see
   *       http://developer.android.com/guide/topics/data/data-storage.html#
   *       filesExternal
   * @param source
   * @throws IOException
   */
  public File fetchImage(Uri source) throws IOException {
    // Note: In API Level < 11 muss man sich das Verzeichnis noch hndisch
    // zusammensetzen
    File cacheDir = new File(Environment.getExternalStorageDirectory()
        .getAbsolutePath()
        + "/de.hsrm.mi.mobcomp.httpclientdemo/cache/");
    if (!cacheDir.exists()) {
      if (!cacheDir.mkdirs())
        throw new IOException("Failed to create: "
            + cacheDir.getAbsolutePath());
    }
    // Pfad zur Cache-Datei
    File imageFile = new File(cacheDir.getAbsolutePath() + "/" + id
        + ".thumb");
    // Note: Hier knnte man prfen, ob es die Cache-Datei schon gibt, zum
    // Demonstrationszwecken wird dies aber explizit nicht gemacht
    HttpClient client = new DefaultHttpClient();
    HttpGet request = new HttpGet(source.toString());
    HttpResponse response = client.execute(request);
    StatusLine status = response.getStatusLine();
    if (status.getStatusCode() != 200) {
      throw new IOException("Invalid response from server: "
          + status.toString());
    }
    HttpEntity entity = response.getEntity();
    InputStream inputStream = entity.getContent();
    // Datei zum Schreiben ffnen
    BufferedOutputStream buf = new BufferedOutputStream(
        new FileOutputStream(imageFile));

    int readBytes = 0;
    byte[] sBuffer = new byte[512];
    while ((readBytes = inputStream.read(sBuffer)) != -1) {
      buf.write(sBuffer, 0, readBytes);
    }
    // Datei schlieen nicht vergessen
    buf.close();
    return imageFile;

  }
}

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