Android Open Source - PictureMap Populate Map Task

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License

The source code is released under:
GNU General Public License
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Java Source Code

/* Copyright (c) 2009 Ari Pollak <aripollak@gmail.com>
/*from   w  w  w.  j a va  2  s .c  o m*/
   This file is part of Picture Map.

   Picture Map is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   Picture Map is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Picture Map.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.aripollak.picturemap;

import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.AsyncTask;
import android.provider.MediaStore.Images;
import android.widget.Toast;

import com.drewChanged.metadata.Metadata;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.OverlayItem;


/** Populate the map overlay with all the images we find */ 
public class PopulateMapTask extends AsyncTask<Uri, OverlayItem, Integer> {
  private static final String TAG = "PopulateMapTask";

  // were we called with a single item?
  private boolean mSingleItem = false;
  private MainActivity mMainActivity;
  // TODO: keep track of overlayitems in a hash, and re-use existing ones?
  public PopulateMapTask(MainActivity ma) {
    mMainActivity = ma;
  }
  
  @Override
  protected Integer doInBackground(Uri... uris) {
      Cursor cursor = null;
      if (uris[0] != null) {
        // a single picture has kindly been shared with us
        mSingleItem = true;
        cursor = mMainActivity.managedQuery(uris[0], null, null, null, null);
      } else {
        // Get the last 200 images from the external image store
        cursor = mMainActivity.managedQuery(
              Images.Media.EXTERNAL_CONTENT_URI, null, 
            null, null, 
              Images.Media.DATE_MODIFIED + " DESC LIMIT 200");
      }
      if (cursor == null)
      return 0;
      
      int idColumn = cursor.getColumnIndexOrThrow(Images.Media._ID);
      int titleColumn = cursor.getColumnIndexOrThrow(Images.Media.TITLE);
      int bucketNameColumn = cursor.getColumnIndexOrThrow(Images.Media.BUCKET_DISPLAY_NAME);
      int bucketIdColumn = cursor.getColumnIndexOrThrow(Images.Media.BUCKET_ID);
      int dataColumn = cursor.getColumnIndexOrThrow(Images.Media.DATA);
      
      if (!cursor.moveToFirst()) {
        return 0;
      }
      
      int imagesAdded = 0;
      do {
           String imageLocation = cursor.getString(dataColumn);
           int imageId = cursor.getInt(idColumn);
           String title = cursor.getString(titleColumn);
           Metadata metadata = ImageUtilities.readMetadata(imageLocation);
           
           if (metadata == null)
             continue;
      GeoPoint point = ImageUtilities.getGPSInfo(metadata);        
      if (point == null)
        continue;
      Bitmap thumb = ImageUtilities.getThumb(metadata, imageLocation, 60);
      if (thumb == null)
        continue;
          
      // add the thumbnail as the marker
      OverlayItem item = new OverlayItem(point, imageLocation, "" + imageId);
      item.setMarker(new BitmapDrawable(thumb));
      publishProgress(item);
      imagesAdded += 1;
      } while (cursor.moveToNext() && !isCancelled());
      
  cursor.close();
      return imagesAdded;
  }
  
  
  @Override
  protected void onProgressUpdate(OverlayItem... items) {
    super.onProgressUpdate(items);
      mMainActivity.mImageOverlay.addOverlay(items[0]);
      if (mSingleItem)
        mMainActivity.mMapView.getController().animateTo(items[0].getPoint());
      mMainActivity.mMapView.invalidate(); // make the map redraw
  }
  
  @Override
  protected void onPreExecute() {
    super.onPreExecute();
    mMainActivity.setProgressBarIndeterminateVisibility(true);
    
  }
  
  @Override
  protected void onPostExecute(Integer result) {
    super.onPostExecute(result);
    if (result == null || result == 0) {
      if (mSingleItem)
        Toast.makeText(mMainActivity, 
                 R.string.toast_no_geo,
                 Toast.LENGTH_LONG).show();
      else
        Toast.makeText(mMainActivity, 
                 R.string.toast_no_images,
                 Toast.LENGTH_LONG).show();
    }
    mMainActivity.setProgressBarIndeterminateVisibility(false);
  }
  
}
Java Source Code List
