Android Open Source - com.elsewhat.android.slideshow File Utils

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License

The source code is released under:

Copyright (C) 2012 Dagfinn Parnas <dagfinn.parnas@gmail.com> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Sof...

Java Source Code

package com.elsewhat.android.slideshow.api;
/*from ww  w. j  a  v a 2s.c  o m*/
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.util.Log;

public class FileUtils {

  public static BitmapDrawable readBitmapFromFile(File imageFile) {
    BitmapDrawable result = null;
    // Log.d(SlideshowActivity.LOG_PREFIX, "Loading image from file " +
    // imageFile.getAbsolutePath() + " "+ imageFile.getName());
    result = new BitmapDrawable(imageFile.getAbsolutePath());
    /*
     * try { //FileInputStream fileStream= new FileInputStream(imageFile);
     * 
     * //fileStream.close(); }catch (IOException e) {
     * Log.w(SlideshowActivity.LOG_PREFIX,
     * "Could not load file from storage " + imageFile.getAbsolutePath() +
     * " "+ imageFile.getName(),e);
     * 
     * }
     */
    return result;
  }

  public static BitmapDrawable readBitmapFromResources(Resources resources,int resourcesId,int maxWidth, int maxHeight) throws IOException{
    //BitmapDrawable result = null;
    //result = new BitmapDrawable(resources, inputStream);

    // Decode image size
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    InputStream inputStream = resources.openRawResource(resourcesId);
    BitmapFactory.decodeStream(inputStream, null, options);
    inputStream.close();

    
    int scale = 1;
    //choose the longest side as basis for scaling since user may change orientation
    int maxDimension = Math.max(maxWidth, maxHeight);
    
    if (options.outHeight > maxDimension || options.outWidth > maxDimension) {
      scale = (int) Math.pow(2, (int) Math.round(Math.log(maxDimension
          / (double) Math.max(options.outHeight, options.outWidth))
          / Math.log(0.5)));
    }

    if(scale!=1){
      Log.d("fileutils", "Loading photo with scale factor "+scale);
    }
    // Decode with inSampleSize
    BitmapFactory.Options options2 = new BitmapFactory.Options();
    options2.inSampleSize = scale;
    options.inPurgeable = true; // Tell to gc that whether it needs free
    // memory, the Bitmap can be cleared
    inputStream = resources.openRawResource(resourcesId);
    Bitmap bitmap = BitmapFactory.decodeStream(inputStream, null,
        options2);

    return new BitmapDrawable(bitmap);
  }
  
  /**
   * Read a purgable drawable at a sensible scale factor
   * 
   * 
   * @param imageFile
   * @param maxWidth
   * @param maxHeight
   * @return
   * @throws IOException
   */
  public static BitmapDrawable readPurgableBitmapFromFile(File imageFile,
      int maxWidth, int maxHeight) throws IOException {

    FileInputStream fileInputStream = null;
    // Decode image size
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;

    fileInputStream = new FileInputStream(imageFile);
    BitmapFactory.decodeStream(fileInputStream, null, options);
    fileInputStream.close();

    int scale = 1;
    //choose the longest side as basis for scaling since user may change orientation
    int maxDimension = Math.max(maxWidth, maxHeight);
    
    if (options.outHeight > maxDimension || options.outWidth > maxDimension) {
      scale = (int) Math.pow(2, (int) Math.round(Math.log(maxDimension
          / (double) Math.max(options.outHeight, options.outWidth))
          / Math.log(0.5)));
    }

    if(scale!=1){
      Log.d("fileutils", "Loading photo with scale factor "+scale);
    }
    // Decode with inSampleSize
    BitmapFactory.Options options2 = new BitmapFactory.Options();
    options2.inSampleSize = scale;
    options.inPurgeable = true; // Tell to gc that whether it needs free
    // memory, the Bitmap can be cleared
    fileInputStream = new FileInputStream(imageFile);
    Bitmap bitmap = BitmapFactory.decodeStream(fileInputStream, null,
        options2);

    return new BitmapDrawable(bitmap);

  }

  public static File writeToFile(File dir, String fileName,
      InputStream inputStream) {

    File file = new File(dir, fileName);
    FileOutputStream f;
    try {
      f = new FileOutputStream(file);

      byte[] buffer = new byte[1024];
      int len1 = 0;
      while ((len1 = inputStream.read(buffer)) > 0) {
        f.write(buffer, 0, len1);
      }
      f.close();
      return file;
    } catch (FileNotFoundException e) {
      e.printStackTrace();
      return null;
    } catch (IOException e) {
      e.printStackTrace();
      return null;
    }
  }

  /*
   * public static BitmapDrawable readBitmapFromFile2(File imageFile){
   * BitmapDrawable result = null; Log.d(SlideshowActivity.LOG_PREFIX,
   * "Loading image from file " + imageFile.getAbsolutePath() + " "+
   * imageFile.getName()); try { final FileChannel channel = in.getChannel();
   * final int fileSize = (int)channel.size(); final byte[] testBytes = new
   * byte[fileSize]; final ByteBuffer buff = ByteBuffer.allocate(fileSize);
   * final byte[] buffArray = buff.array(); final int buffBase =
   * buff.arrayOffset(); // Read from channel into buffer, and batch read from
   * buffer to byte array long time1 = System.currentTimeMillis();
   * channel.position(0); channel.read(buff); buff.flip();
   * buff.get(testBytes); buff. new BitmapDrawable }catch (IOException e) {
   * Log.w(SlideshowActivity.LOG_PREFIX, "Could not load file from storage " +
   * imageFile.getAbsolutePath() + " "+ imageFile.getName(),e);
   * 
   * } return result; }
   */

}

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