Android Open Source - Operation-Valkyrie Decode Bitmaps

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License

The source code is released under:

Terms and conditions Preamble: This Agreement, signed on Jun 10, 2012 [hereinafter: Effective Date] governs the relationship between the Enduser, a private person, (hereinafter: Licensee) and Paul N...

Java Source Code

package valkyrie.file;
//from w ww . ja  v  a 2  s  .c om
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Vector;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Environment;
import android.util.Log;

/**
 * 
 * COPYRIGHT: Paul Neuhold, Laurenz Theuerkauf, Alexander Ritz, Jakob
 * Schweighofer, Milo Tischler ? Milo Tischler, Jakob Schweighofer, Alexander
 * Ritz, Paul Neuhold, Laurenz Theuerkauf
 * 
 */

/**
 * 
 * This class handles all the file paths and thumb paths so that a correct
 * viewing in the gridview and then viewing the correct item in FUllscreen mode
 * is possible. Also responsible for creating new thumbs in case of new pictures
 * in the gallery.
 * 
 */
public class DecodeBitmaps {

  public static boolean done = false;
  private String TAG = "DecodeBitmaps";
  private File files = new File(Environment.getExternalStorageDirectory()
      + "/Valkyrie/Gallery");
  private File thumbFiles = new File(
      Environment.getExternalStorageDirectory() + "/Valkyrie/Thumbnls");
  private File fileList[];
  private File thumbList[];
  public static Vector<Bitmap> thumbs = new Vector<Bitmap>();
  public static Vector<String> fullImgPosition = new Vector<String>();
  public static Vector<File> fileVector = new Vector<File>();
  public static Vector<String> fullImgNames = new Vector<String>();
  public static Vector<String> thumbPosition = new Vector<String>();
  private int opt = 4;

  /**
   * called if new pictures are taken or some are deleted
   * 
   * @param int error out of memory for displaying the thumbs in the gridview
   */
  public DecodeBitmaps(int error) {
    // in case of outofmemory for creating thumbs
    if (error == 1) {
      this.opt = 6;
      Log.d(TAG, "new opt ? : " + this.opt);
      thumbs.clear();
      thumbPosition.clear();
      fullImgNames.clear();
      fullImgPosition.clear();
      decodeBitmap();
    } else {
      // if thumbs are already saved skip this class
      if (done == true) {
        // TODO: its too static ;)
        Log.d(TAG, "all work here was done hours ago ;)");
      } else {
        thumbs.clear();
        thumbPosition.clear();
        fullImgNames.clear();
        fullImgPosition.clear();
        decodeBitmap();
      }
    }

  }

  /**
   * this function is called everytime we have a new picture in the
   * galleryfolder then it checks if all the other thumbs are still exists, if
   * not new ones will be created.
   */
  private void decodeBitmap() {

    fileList = files.listFiles();
    thumbList = thumbFiles.listFiles();
    BitmapFactory.Options thumbOpt = new BitmapFactory.Options();
    thumbOpt.inSampleSize = opt;

    if (fileList != null && thumbList != null) {
      // save positions and names for all files
      // to display and check all thumbs and full images
      for (int i = 0; i < fileList.length; i++) {
        if (fileList[i] != null) {
          fullImgPosition.add(fileList[i].getAbsolutePath());
          fullImgNames.add(fileList[i].getName());
          Log.d(TAG, "file length: " + fileList.length
              + "but i still : " + i);
        } else {
          i++;
        }

      }

      int thumbCounter = 0;
      for (int i = 0; i < fileList.length; i++) {
        if (fileList[i] != null) {
          boolean match = false;
          // check if a thumb of a given file already exists
          for (File f : thumbList) {
            // Log.d(TAG,
            // "Checking if thumb already exists for all thumbs " +
            // i + ": " + f.getName());
            if (f.getName().contentEquals(fileList[i].getName())) {
              match = true;
              Log.d(TAG, "thumb name here with : " + f.getName());
            }

          }
          if (match) {
            thumbPosition.add(thumbList[thumbCounter]
                .getAbsolutePath());

            thumbCounter++;
            Log.d(TAG, "thumb already exists : " + i);
            // if a new picture is taken we didnt have a thumb so
            // match
            // == false
            // so we need a new thumb
          } else {
            Log.d(TAG,
                "saving thumb with name: "
                    + fileList[i].getName());
            Bitmap newThumb;
            newThumb = BitmapFactory.decodeFile(
                fileList[i].getAbsolutePath(), thumbOpt);
            saveAThumb(newThumb, fileList[i].getName(), i);

          }
        } else {
          i++;
        }
        done = true;
      }
    } else {

    }
    Log.d(TAG, "done");
  }

  /**
   * A compressed png is produced in a thumbfolder for a quicker performance
   * in the gridview. Only if the sdcard is not mounted.
   * 
   * @param Bitmap
   *            bitmap The bitmap to save in form of a thumb
   * @param String
   *            imgName The given Name for the thumb
   */
  public void saveAThumb(Bitmap bitmap, String imgName, int vecPos) {

    String state = Environment.getExternalStorageState();
    if (Environment.MEDIA_MOUNTED.equals(state)) {

      ByteArrayOutputStream bytes = new ByteArrayOutputStream();
      bitmap.compress(Bitmap.CompressFormat.PNG, 100, bytes);
      File f = new File(Environment.getExternalStorageDirectory()
          + "/Valkyrie/Thumbnls/" + imgName);
      try {
        f.createNewFile();
        FileOutputStream fo = new FileOutputStream(f);
        fo.write(bytes.toByteArray());
        Log.d(TAG, "saved a Thumb");

      } catch (IOException e) {
        Log.d(TAG, "io crash ? ");
        e.printStackTrace();
      }
      
      thumbList = thumbFiles.listFiles();
      thumbPosition.add(thumbList[vecPos].getAbsolutePath());
      
      bitmap.recycle();

    } else {
      Log.d(TAG, "couldnt save the thumb");
      bitmap.recycle();
    }
  }

  /**
   * Recycles all the bitmaps
   */
  public void recycleBitmaps() {
    int i = 0;
    for (Bitmap b : DecodeBitmaps.thumbs) {
      i++;
      b.recycle();
      Log.d(TAG, i + " Bitmaps recycled");
    }
  }

}

Java Source Code List

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