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POGetting images from CBZ archive
 

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  1. POGetting images from CBZ archive
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    <p>I need to get images from CBZ archives and display them in my PageViewer. At the moment I'm unzipping the CBZ archive and placing the images on the SD-Card which is so slow... It takes 8 seconds to unzip one image. Is there any other way to do this? I don't need to unzip the CBZ archive, but just get the images to display them. Any suggestions would be great to speed this up.</p> <p>Code to unzip the archive:</p> <pre><code>package nl.MarcVale.ComicViewer; /** * Created by Marc on 23-8-13. */ import android.util.Log; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.util.zip.ZipEntry; import java.util.zip.ZipInputStream; public class DecompressZip { private String _zipFile; private String _location; public DecompressZip(String zipFile, String location) { _zipFile = zipFile; _location = location; _dirChecker(""); } public void unzip() { try { FileInputStream fin = new FileInputStream(_zipFile); ZipInputStream zin = new ZipInputStream(fin); ZipEntry ze = null; while ((ze = zin.getNextEntry()) != null) { Log.v("Decompress", "Unzipping " + ze.getName()); if(ze.isDirectory()) { _dirChecker(ze.getName()); } else { FileOutputStream fout = new FileOutputStream(_location + ze.getName()); for (int c = zin.read(); c != -1; c = zin.read()) { fout.write(c); } zin.closeEntry(); fout.close(); } } zin.close(); } catch(Exception e) { Log.e("Decompress", "unzip", e); } } private void _dirChecker(String dir) { File f = new File(_location + dir); if(!f.isDirectory()) { f.mkdirs(); } } } </code></pre> <p>Edit: Some more code after a answer:</p> <p>I'm creating the zipFile to downscale it, because the images are way too big. I'm getting a OutOfMemory exception at the first decodeFromStream line.</p> <pre><code>ZipFile zipFile = null; try { zipFile = new ZipFile("/sdcard/file.cbz"); } catch (IOException e) { e.printStackTrace(); } for (Enumeration&lt;? extends ZipEntry&gt; e = zipFile.entries(); e.hasMoreElements(); ) { ZipEntry ze = e.nextElement(); try { //Bitmap bm = BitmapFactory.decodeStream(zipFile.getInputStream(ze)); Bitmap bm = decodeScaledBitmapFromSdCard(zipFile.getInputStream(ze),width,height); pages.add(bm); } catch (IOException e1) { e1.printStackTrace(); } } } public static Bitmap decodeScaledBitmapFromSdCard(InputStream filePath, int reqWidth, int reqHeight) { // First decode with inJustDecodeBounds=true to check dimensions final BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; //BitmapFactory.decodeFile(filePath, options); BitmapFactory.decodeStream(filePath, null, options); // Calculate inSampleSize options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); // Decode bitmap with inSampleSize set options.inJustDecodeBounds = false; return BitmapFactory.decodeStream(filePath, null, options); } public static int calculateInSampleSize( BitmapFactory.Options options, int reqWidth, int reqHeight) { // Raw height and width of image final int height = options.outHeight; final int width = options.outWidth; int inSampleSize = 1; if (height &gt; reqHeight || width &gt; reqWidth) { // Calculate ratios of height and width to requested height and width final int heightRatio = Math.round((float) height / (float) reqHeight); final int widthRatio = Math.round((float) width / (float) reqWidth); // Choose the smallest ratio as inSampleSize value, this will guarantee // a final image with both dimensions larger than or equal to the // requested height and width. inSampleSize = heightRatio &lt; widthRatio ? heightRatio : widthRatio; } return inSampleSize; } </code></pre>
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