/*
* The MIT License (MIT)
*
* Copyright � 2013 Clover Studio Ltd. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.cloverstudio.spikademo.lazy;
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 java.io.OutputStream;
import java.util.Collections;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.view.View;
import android.widget.ImageView;
import android.widget.ProgressBar;
import com.cloverstudio.spikademo.R;
import com.cloverstudio.spikademo.couchdb.ConnectionHandler;
import com.cloverstudio.spikademo.couchdb.CouchDB;
import com.cloverstudio.spikademo.management.UsersManagement;
import com.cloverstudio.spikademo.utils.Logger;
import com.cloverstudio.spikademo.utils.Utils;
/**
* ImageLoader
*
* Loads images from web, compresses and saves them to both memory cache and file directory.
*/
public class ImageLoader {
MemoryCache memoryCache = new MemoryCache();
FileCache fileCache;
private Map<ImageView, String> imageViews = Collections
.synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;
Handler handler = new Handler();// handler to display images in UI thread
public static ImageLoader sInstance = null;
public static final String SMALL = "_small";
public static final String LARGE = "_large";
private final int SIZE_SMALL = 100;
private final int SIZE_LARGE = 400;
public static void initImageLoaderInstance(Context context) {
if (ImageLoader.sInstance == null) {
ImageLoader.sInstance = new ImageLoader(context);
}
}
public static ImageLoader getImageLoader() {
return sInstance;
}
public ImageLoader(Context context) {
fileCache = new FileCache(context);
executorService = Executors.newFixedThreadPool(5);
}
final int stub_id = com.cloverstudio.spikademo.R.drawable.image_stub;
public void DisplayImage(String fileId, ImageView imageView, String size, boolean downloadFromUrl) {
imageViews.put(imageView, fileId + size);
Bitmap bitmap = memoryCache.get(fileId + size);
if (bitmap != null) {
imageView.setImageBitmap(bitmap);
}
else {
queuePhoto(fileId, size, imageView, downloadFromUrl);
// imageView.setImageResource(stub_id);
}
}
public void DisplayImage(String fileId, ImageView imageView,
ProgressBar pbLoading, String size, boolean downloadFromUrl) {
imageViews.put(imageView, fileId + size);
Bitmap bitmap = memoryCache.get(fileId + size);
if (bitmap != null) {
imageView.setImageBitmap(bitmap);
pbLoading.setVisibility(View.GONE);
} else {
queuePhotoWithProgress(fileId, size, imageView, pbLoading, downloadFromUrl);
}
}
private void queuePhoto(String fileId, String size, ImageView imageView, boolean fromUrl) {
PhotoToLoad p = new PhotoToLoad(fileId, size, imageView, fromUrl);
executorService.submit(new PhotosLoader(p));
}
private void queuePhotoWithProgress(String fileId, String size,
ImageView imageView, ProgressBar progressBar, boolean fromUrl) {
PhotoToLoad p = new PhotoToLoad(fileId, size, imageView, progressBar, fromUrl);
executorService.submit(new PhotosLoader(p));
}
public Bitmap getBitmap(String fileId, String size, boolean fromUrl) {
File file = fileCache.getFile(fileId + size);
// from SD cache
Bitmap bitmap = decodeFile(file, size);
if (bitmap != null) {
return bitmap;
}
// from web
try {
bitmap = null;
if (fromUrl) {
InputStream is = ConnectionHandler.httpGetRequest(fileId,
UsersManagement.getLoginUser().getId());
OutputStream os = new FileOutputStream(file);
Utils.copyStream(is, os);
os.close();
is.close();
} else {
CouchDB.downloadFile(fileId, file);
}
bitmap = decodeFile(file, size);
return bitmap;
// return ConnectionHandler.getBitmapObject(url);
} catch (Throwable ex) {
ex.printStackTrace();
if (ex instanceof OutOfMemoryError)
memoryCache.clear();
return null;
}
}
public Bitmap getBitmap(String url) {
File f = fileCache.getFile(url);
// from SD cache
Bitmap bitmap = decodeFile(f);
if (bitmap != null) {
Logger.error("ImageLoader", "fileCache.returnBitmap : " + url);
return bitmap;
}
// from web
try {
bitmap = null;
InputStream is = ConnectionHandler.httpGetRequest(url,
UsersManagement.getLoginUser().getId());
OutputStream os = new FileOutputStream(f);
Utils.copyStream(is, os);
os.close();
is.close();
// conn.disconnect();
bitmap = decodeFile(f);
return bitmap;
// return ConnectionHandler.getBitmapObject(url);
} catch (Throwable ex) {
ex.printStackTrace();
if (ex instanceof OutOfMemoryError)
memoryCache.clear();
return null;
}
}
// decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f, String size) {
try {
// decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
FileInputStream stream1 = new FileInputStream(f);
BitmapFactory.decodeStream(stream1, null, o);
stream1.close();
int REQUIRED_SIZE = 200;
// Find the correct scale value. It should be the power of 2.
if (size.equals(SMALL)) {
REQUIRED_SIZE = SIZE_SMALL;
} else if (size.equals(LARGE)) {
REQUIRED_SIZE = SIZE_LARGE;
}
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE
|| height_tmp / 2 < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// scale=4;
// decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
if (Utils.isOsVersionHigherThenGingerbread()) {
o2.inPreferredConfig = Bitmap.Config.ARGB_8888;
} else {
o2.inPreferredConfig = Bitmap.Config.RGB_565;
}
FileInputStream stream2 = new FileInputStream(f);
Bitmap bitmap = BitmapFactory.decodeStream(stream2, null, o2);
stream2.close();
return bitmap;
} catch (FileNotFoundException e) {
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private Bitmap decodeFile(File f) {
try {
// decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
FileInputStream stream1 = new FileInputStream(f);
BitmapFactory.decodeStream(stream1, null, o);
stream1.close();
int REQUIRED_SIZE = 200;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE
|| height_tmp / 2 < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// scale=4;
// decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
if (Utils.isOsVersionHigherThenGingerbread()) {
o2.inPreferredConfig = Bitmap.Config.ARGB_8888;
} else {
o2.inPreferredConfig = Bitmap.Config.RGB_565;
}
FileInputStream stream2 = new FileInputStream(f);
Bitmap bitmap = BitmapFactory.decodeStream(stream2, null, o2);
stream2.close();
return bitmap;
} catch (FileNotFoundException e) {
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
// Task for the queue
private class PhotoToLoad {
public String fileId;
public String size;
public ImageView imageView;
public ProgressBar pbLoading = null;
public boolean fromUrl = false;
public PhotoToLoad(String f, String s, ImageView i, ProgressBar pb, boolean url) {
fileId = f;
size = s;
imageView = i;
pbLoading = pb;
fromUrl = url;
}
public PhotoToLoad(String f, String s, ImageView i, boolean url) {
size = s;
fileId = f;
imageView = i;
fromUrl = url;
}
}
class PhotosLoader implements Runnable {
PhotoToLoad photoToLoad;
PhotosLoader(PhotoToLoad photoToLoad) {
this.photoToLoad = photoToLoad;
}
@Override
public void run() {
try {
if (imageViewReused(photoToLoad))
return;
Bitmap bmp = getBitmap(photoToLoad.fileId, photoToLoad.size, photoToLoad.fromUrl);
memoryCache.put(photoToLoad.fileId + photoToLoad.size, bmp);
if (imageViewReused(photoToLoad))
return;
BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad);
handler.post(bd);
} catch (Throwable th) {
th.printStackTrace();
}
}
}
boolean imageViewReused(PhotoToLoad photoToLoad) {
String tag = imageViews.get(photoToLoad.imageView);
if (tag == null || !tag.equals(photoToLoad.fileId + photoToLoad.size))
return true;
return false;
}
// Used to display bitmap in the UI thread
class BitmapDisplayer implements Runnable {
Bitmap bitmap;
PhotoToLoad photoToLoad;
public BitmapDisplayer(Bitmap b, PhotoToLoad p) {
bitmap = b;
photoToLoad = p;
}
public void run() {
if (imageViewReused(photoToLoad))
return;
if (bitmap != null) {
photoToLoad.imageView.setImageBitmap(bitmap);
if (photoToLoad.pbLoading != null) {
photoToLoad.pbLoading.setVisibility(View.GONE);
}
} else {
// if (photoToLoad.pbLoading == null) {
// photoToLoad.imageView.setImageResource(stub_id);
// }
}
}
}
public void clearCache() {
memoryCache.clear();
fileCache.clear();
}
public void cancelDisplayTaskFor(ImageView imageView) {
imageViews.remove(imageView);
}
public void cancelDisplayTaskFor(ImageView imageView, ProgressBar progressBar) {
imageViews.remove(imageView);
// progressBar.setVisibility(View.GONE);
}
}