Android Open Source - Color-Detector Download Fragment

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Back to project page Color-Detector.

License

The source code is released under:

Apache License

Java Source Code

package org.ia.practiques;
/*from   w w  w . j a v  a  2 s .c  o  m*/
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.concurrent.ExecutionException;

import android.app.DialogFragment;
import android.app.Fragment;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;

/**
 * This class contain the fragment which download the bitmap
 * 
 * @author Victor Martinez
 * @see Bitmap
 */
public class DownloadFragment extends Fragment {

  private Bitmap loadedImage;
  private String imageURL;
  private DownloadImageTask ImageTask = null;
  private KmeansTask kmeansTask = null;
  private Bitmap bitmap;
  private ProgressBar progressBar;

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.download_fragment2, container,
        false);
    progressBar = (ProgressBar) view.findViewById(R.id.progressBar1);
    progressBar.setVisibility(View.INVISIBLE);

    Button download_button = (Button) view
        .findViewById(R.id.download_button);

    download_button.setOnClickListener(new View.OnClickListener() {

      public void onClick(View v) {
        EditText URL = (EditText) getView()
            .findViewById(R.id.url_input);
        imageURL = URL.getText().toString();

        ImageTask = new DownloadImageTask();
        // aqui llamaremos al metodo de descarga
        ImageTask.execute(imageURL);

      }

    });

    return view;
  }

  private void setImage() {
    try {
      bitmap = ImageTask.get();
      kmeansTask = new KmeansTask();
      kmeansTask.execute(bitmap);

    } catch (InterruptedException e) {
      e.printStackTrace();
    } catch (ExecutionException e) {
      e.printStackTrace();
    }

  }

  /**
   * This method generate a DialogFragment with the predominant colours of the
   * bitmap
   * 
   * @throws InterruptedException
   * @throws ExecutionException
   */
  private void setDialog() throws InterruptedException, ExecutionException {

    String string = kmeansTask.get();
    DialogFragment id = new ImageDialog(bitmap, string);
    id.show(getFragmentManager(), "image");
  }

  /**
   * This thread download and fills the bitmap on the background
   * 
   * @see AsyncTask
   */
  public class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {

    @Override
    protected void onPreExecute() {
      progressBar.setVisibility(View.VISIBLE);
      super.onPreExecute();
    }

    @Override
    protected void onPostExecute(Bitmap result) {
      setImage();

      super.onPostExecute(result);

    }

    // descargar el bitmap en background
    @Override
    protected Bitmap doInBackground(String... imageHttpAddress) {
      URL imageUrl = null;
      try {
        imageUrl = new URL(imageHttpAddress[0]);
        HttpURLConnection conn = (HttpURLConnection) imageUrl
            .openConnection();
        conn.connect();
        loadedImage = BitmapFactory.decodeStream(conn.getInputStream());
      } catch (IOException e) {
        e.printStackTrace();
      }
      return loadedImage;
    }

  }

  /**
   * This thread execute the k-means algorithm on the background
   * 
   * @see AsyncTask
   */
  public class KmeansTask extends AsyncTask<Bitmap, Void, String> {

    private Rgb[] mClusters;

    @Override
    protected String doInBackground(Bitmap... params) {

      Kmeans k = new Kmeans(2500, 10, params[0]);

      k.initCLusters();
      k.startKmeans();
      mClusters = k.getClusters();
      int[] cnt = k.getCnt();
      ClusterToString cTs = new ClusterToString(mClusters, cnt);
      String string = cTs.getColours();

      return string;
    }

    @Override
    protected void onPostExecute(String result) {

      try {
        setDialog();
        progressBar.setProgress(0);
        progressBar.setVisibility(View.INVISIBLE);
      } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (ExecutionException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
      super.onPostExecute(result);
    }

  }

}

Java Source Code List

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