Java tutorial
package com.nd.teacherplatform.util; /* * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.FilterInputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.lang.ref.SoftReference; import java.lang.ref.WeakReference; import java.util.Arrays; import java.util.Comparator; import java.util.HashMap; import java.util.LinkedHashMap; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.RejectedExecutionException; import java.util.regex.Matcher; import java.util.regex.Pattern; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import com.nd.teacherplatform.constant.Constants; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.net.http.AndroidHttpClient; import android.os.AsyncTask; import android.os.Environment; import android.os.Handler; import android.os.Looper; import android.os.Message; import android.os.StatFs; import android.util.Log; import android.view.WindowManager; import android.widget.ImageView; /** * ********************************************************** * * @ * <p> * * @ * @ 2012-12-22 9:55:37 * @ : * @ : 2012-12-22 9:55:37 ? * @ : This helper class download images from the Internet and binds those * with the provided ImageView. */ public class ImageDownloader { private static final String LOG_TAG = "ImageDownloader"; public enum Mode { NO_ASYNC_TASK, NO_DOWNLOADED_DRAWABLE, CORRECT } private Mode mode = Mode.CORRECT; private static Context context; public ImageDownloader(Context context) { ImageDownloader.context = context; } /** * * * / MyGoPlusV3 * * <pre> * * 2013-6-14 ? * </pre> */ public interface ImageDownLoaderAction { void downFinish(); } /** * Download the specified image from the Internet and binds it to the * provided ImageView. The binding is immediate if the image is found in the * cache and will be done asynchronously otherwise. A null bitmap will be * associated to the ImageView if an error occurs. * * @param url * The URL of the image to download. * @param imageView * The ImageView to bind the downloaded image to. */ public void download(String url, ImageView imageView, int loadingDrawable_ID, int failDrawable_ID, boolean isSaveLocal) { Bitmap bitmap = getBitmapFromCache(url); /* */ if (bitmap == null && isSaveLocal) { bitmap = getBitmapFromLocal(url, Constants.FILE_CACHE); } /* */ if (bitmap == null) { forceDownload(url, imageView, loadingDrawable_ID, failDrawable_ID, isSaveLocal, null); } else { cancelPotentialDownload(url, imageView); imageView.setImageBitmap(bitmap); } } /** * * dD{ * * @param url * * @param imageView * imageview * @param loadingDrawable_ID * * @param failDrawable_ID * * @param isSaveLocal * * @param action * MyGoPlusV3 * * <pre> * * 2013-6-13 ? * </pre> */ public void download(String url, ImageView imageView, int loadingDrawable_ID, int failDrawable_ID, boolean isSaveLocal, ImageDownLoaderAction action) { Bitmap bitmap = getBitmapFromCache(url); /* */ if (bitmap == null && isSaveLocal) { bitmap = getBitmapFromLocal(url, Constants.FILE_CACHE); } /* */ if (bitmap == null) { forceDownload(url, imageView, loadingDrawable_ID, failDrawable_ID, isSaveLocal, action); } else { cancelPotentialDownload(url, imageView); imageView.setImageBitmap(bitmap); if (action != null) { action.downFinish(); } } } /** * * dDD{]?C * * @param url * @param imageView * imageview * @param width * * @param height * * @param loadingDrawable_ID * * @param failDrawable_ID * * @param isSaveLocal * * @param action * MyGoPlusV3 * * <pre> * * 2013-6-13 ? * </pre> */ public void download(String url, ImageView imageView, int width, int height, int loadingDrawable_ID, int failDrawable_ID, boolean isSaveLocal, ImageDownLoaderAction action) { // Bitmap bitmap = getBitmapFromCache(url); Bitmap bitmap = null; /* */ if (bitmap == null && isSaveLocal) { bitmap = getBitmapFromLocal(url, Constants.FILE_CACHE, width, height); } /* */ if (bitmap == null) { forceDownload(url, imageView, width, height, Constants.FILE_CACHE, loadingDrawable_ID, failDrawable_ID, isSaveLocal, action); } else { cancelPotentialDownload(url, imageView); imageView.setImageBitmap(bitmap); if (action != null) { action.downFinish(); } } } /* * Same as download but the image is always downloaded and the cache is not * used. Kept private at the moment as its interest is not clear. private * void forceDownload(String url, ImageView view) { forceDownload(url, view, * null); } */ /** * Same as download but the image is always downloaded and the cache is not * used. Kept private at the moment as its interest is not clear. */ private void forceDownload(String url, ImageView imageView, int loadingDrawable_ID, int failDrawable_ID, boolean isSaveLocal, ImageDownLoaderAction action) { if (url == null) { imageView.setImageResource(failDrawable_ID); return; } if (cancelPotentialDownload(url, imageView)) { /* modeCORRECT */ switch (mode) { case NO_ASYNC_TASK: Bitmap bitmap = downloadBitmap(url); addBitmapToCache(url, bitmap); imageView.setImageBitmap(bitmap); break; case NO_DOWNLOADED_DRAWABLE: imageView.setMinimumHeight(156); BitmapDownloaderTask task = new BitmapDownloaderTask(imageView, failDrawable_ID, isSaveLocal, action); task.execute(url); break; case CORRECT: task = new BitmapDownloaderTask(imageView, failDrawable_ID, isSaveLocal, action); DownloadedDrawable downloadedDrawable = new DownloadedDrawable(task, loadingDrawable_ID); imageView.setImageDrawable(downloadedDrawable); imageView.setMinimumHeight(156); try { task.execute(url); } catch (RejectedExecutionException localRejectedExecutionException) { } break; } } } /** * Same as download but the image is always downloaded and the cache is not * used. Kept private at the moment as its interest is not clear. */ private void forceDownload(String url, ImageView imageView, int width, int height, String parentFullFileName, int loadingDrawable_ID, int failDrawable_ID, boolean isSaveLocal, ImageDownLoaderAction action) { // State sanity: url is guaranteed to never be null in // DownloadedDrawable and cache keys. if (url == null) { imageView.setImageResource(failDrawable_ID); return; } if (cancelPotentialDownload(url, imageView)) { /* modeCORRECT */ switch (mode) { case NO_ASYNC_TASK: Bitmap bitmap = downloadBitmap(url); addBitmapToCache(url, bitmap); imageView.setImageBitmap(bitmap); break; case NO_DOWNLOADED_DRAWABLE: imageView.setMinimumHeight(156); BitmapDownloaderTask task = new BitmapDownloaderTask(imageView, failDrawable_ID, isSaveLocal, action); task.execute(url); break; case CORRECT: task = new BitmapDownloaderTask(imageView, width, height, parentFullFileName, failDrawable_ID, isSaveLocal, action); DownloadedDrawable downloadedDrawable = new DownloadedDrawable(task, loadingDrawable_ID); imageView.setImageDrawable(downloadedDrawable); imageView.setMinimumHeight(156); try { task.execute(url); } catch (RejectedExecutionException localRejectedExecutionException) { } break; } } } /** * Returns true if the current download has been canceled or if there was no * download in progress on this image view. * true Returns false if the download in * progress deals with the same url. The download is not stopped in that * case. URLfalse */ private static boolean cancelPotentialDownload(String url, ImageView imageView) { BitmapDownloaderTask bitmapDownloaderTask = getBitmapDownloaderTask(imageView); if (bitmapDownloaderTask != null) { String bitmapUrl = bitmapDownloaderTask.url; if ((bitmapUrl == null) || (!bitmapUrl.equals(url))) { bitmapDownloaderTask.cancel(true); } else { return false; } } return true; } /** * @param imageView * Any imageView * @return Retrieve the currently active download task (if any) associated * with this imageView. null if there is no such task. */ private static BitmapDownloaderTask getBitmapDownloaderTask(ImageView imageView) { if (imageView != null) { Drawable drawable = imageView.getDrawable(); if (drawable instanceof DownloadedDrawable) { DownloadedDrawable downloadedDrawable = (DownloadedDrawable) drawable; return downloadedDrawable.getBitmapDownloaderTask(); } } return null; } /** * * SD * * @param url * * @param width * * @param height * * @param parentFullFileName * * @param isSaveLoacl * * @return MyGoPlusV3 * * <pre> * * 2013-6-14 ? * </pre> */ Bitmap downloadBitmap(String url, int width, int height, String parentFullFileName, boolean isSaveLoacl) { final HttpClient client = (mode == Mode.NO_ASYNC_TASK) ? new DefaultHttpClient() : AndroidHttpClient.newInstance("Android"); final HttpGet getRequest = new HttpGet(url); try { HttpResponse response = client.execute(getRequest); final int statusCode = response.getStatusLine().getStatusCode(); if (statusCode != HttpStatus.SC_OK) { Log.w("ImageDownloader", "Error " + statusCode + " while retrieving bitmap from " + url); return null; } final HttpEntity entity = response.getEntity(); if (entity != null) { InputStream inputStream = null; try { inputStream = entity.getContent(); saveInputStreamToSd(inputStream, url, isSaveLoacl, parentFullFileName); return getBitmapFromLocal(url, parentFullFileName, width, height); } finally { if (inputStream != null) { inputStream.close(); } entity.consumeContent(); } } } catch (IOException e) { getRequest.abort(); Log.w(LOG_TAG, "I/O error while retrieving bitmap from " + url, e); } catch (IllegalStateException e) { getRequest.abort(); Log.w(LOG_TAG, "Incorrect URL: " + url); } catch (Exception e) { getRequest.abort(); Log.w(LOG_TAG, "Error while retrieving bitmap from " + url, e); } finally { if ((client instanceof AndroidHttpClient)) { ((AndroidHttpClient) client).close(); } } return null; } /** * * * * @param url * @return MyGoPlusV3 * * <pre> * * 2013-6-14 ? * </pre> */ Bitmap downloadBitmap(String url) { // AndroidHttpClient is not allowed to be used from the main thread System.out.println("" + url + ""); final HttpClient client = (mode == Mode.NO_ASYNC_TASK) ? new DefaultHttpClient() : AndroidHttpClient.newInstance("Android"); try { final HttpGet getRequest = new HttpGet(url); HttpResponse response = client.execute(getRequest); final int statusCode = response.getStatusLine().getStatusCode(); if (statusCode != HttpStatus.SC_OK) { Log.w("ImageDownloader", "Error " + statusCode + " while retrieving bitmap from " + url); return null; } final HttpEntity entity = response.getEntity(); if (entity != null) { InputStream inputStream = null; try { inputStream = entity.getContent(); // return BitmapFactory.decodeStream(inputStream); // Bug on slow connections, fixed in future release. return BitmapFactory.decodeStream(new FlushedInputStream(inputStream)); } finally { if (inputStream != null) { inputStream.close(); } entity.consumeContent(); } } } catch (IOException e) { // getRequest.abort(); Log.w(LOG_TAG, "I/O error while retrieving bitmap from " + url, e); } catch (IllegalStateException e) { // getRequest.abort(); Log.w(LOG_TAG, "Incorrect URL: " + url); } catch (Exception e) { // getRequest.abort(); Log.w(LOG_TAG, "Error while retrieving bitmap from " + url, e); } finally { if ((client instanceof AndroidHttpClient)) { ((AndroidHttpClient) client).close(); } } return null; } /* * An InputStream that skips the exact number of bytes provided, unless it * reaches EOF. */ static class FlushedInputStream extends FilterInputStream { public FlushedInputStream(InputStream inputStream) { super(inputStream); } @Override public long skip(long n) throws IOException { long totalBytesSkipped = 0L; while (totalBytesSkipped < n) { long bytesSkipped = in.skip(n - totalBytesSkipped); if (bytesSkipped == 0L) { int b = read(); if (b < 0) { break; // we reached EOF } else { bytesSkipped = 1; // we read one byte } } totalBytesSkipped += bytesSkipped; } return totalBytesSkipped; } } /** * The actual AsyncTask that will asynchronously download the image. */ class BitmapDownloaderTask extends AsyncTask<String, Void, Bitmap> { private String url; private final WeakReference<ImageView> imageViewReference; private int failDrawable_ID; private boolean isSaveLocal; private ImageDownLoaderAction action; private int width; private int height; private String parentFullFileName; public BitmapDownloaderTask(ImageView imageView, int failDrawable_ID, boolean isSaveLocal, ImageDownLoaderAction action) { imageViewReference = new WeakReference<ImageView>(imageView); BitmapDownloaderTask.this.failDrawable_ID = failDrawable_ID; BitmapDownloaderTask.this.isSaveLocal = isSaveLocal; BitmapDownloaderTask.this.action = action; } public BitmapDownloaderTask(ImageView imageView, int width, int height, String parentFullFileName, int failDrawable_ID, boolean isSaveLocal, ImageDownLoaderAction action) { imageViewReference = new WeakReference<ImageView>(imageView); BitmapDownloaderTask.this.failDrawable_ID = failDrawable_ID; BitmapDownloaderTask.this.isSaveLocal = isSaveLocal; BitmapDownloaderTask.this.action = action; BitmapDownloaderTask.this.width = width; BitmapDownloaderTask.this.height = height; BitmapDownloaderTask.this.parentFullFileName = parentFullFileName; } /** * Actual download method. */ @Override protected Bitmap doInBackground(String... params) { Bitmap bmp = null; url = params[0]; System.out.println(" =" + url + ""); /* */ if (width > 0 && height > 0 && parentFullFileName != null && parentFullFileName.trim().length() != 0) { bmp = downloadBitmap(url, width, height, parentFullFileName, isSaveLocal); } else { bmp = downloadBitmap(url); /* */ if (bmp != null) { ImageDownloader.this.saveBmpToSd(bmp, url, isSaveLocal, Constants.FILE_CACHE); } } return bmp; } /** * Once the image is downloaded, associates it to the imageView */ @Override protected void onPostExecute(Bitmap bitmap) { if (isCancelled()) { bitmap = null; } addBitmapToCache(url, bitmap); if (imageViewReference != null) { ImageView imageView = imageViewReference.get(); BitmapDownloaderTask bitmapDownloaderTask = getBitmapDownloaderTask(imageView); if ((this == bitmapDownloaderTask) || (mode != Mode.CORRECT)) { if (bitmap == null) { imageView.setImageResource(failDrawable_ID); } else { imageView.setImageBitmap(bitmap); } if (action != null) { action.downFinish(); } } } } } /** * A fake Drawable that will be attached to the imageView while the download * is in progress. * * <p> * Contains a reference to the actual download task, so that a download task * can be stopped if a new binding is required, and makes sure that only the * last started download process can bind its result, independently of the * download finish order. * </p> */ static class DownloadedDrawable extends BitmapDrawable { private final WeakReference<BitmapDownloaderTask> bitmapDownloaderTaskReference; public DownloadedDrawable(BitmapDownloaderTask bitmapDownloaderTask, int loadingDrawable_ID) { super(readBitmap(context, loadingDrawable_ID)); bitmapDownloaderTaskReference = new WeakReference<BitmapDownloaderTask>(bitmapDownloaderTask); } public BitmapDownloaderTask getBitmapDownloaderTask() { return bitmapDownloaderTaskReference.get(); } } public void setMode(Mode mode) { this.mode = mode; clearCache(); } /* * Cache-related fields and methods. * * We use a hard and a soft cache. A soft reference cache is too * aggressively cleared by the Garbage Collector. */ private static final int HARD_CACHE_CAPACITY = 10; private static final int DELAY_BEFORE_PURGE = 10 * 1000; // in milliseconds // Hard cache, with a fixed maximum capacity and a life duration private final HashMap<String, Bitmap> sHardBitmapCache = new LinkedHashMap<String, Bitmap>( HARD_CACHE_CAPACITY / 2, 0.75f, true) { @Override protected boolean removeEldestEntry(Entry<String, Bitmap> eldest) { if (size() > HARD_CACHE_CAPACITY) { // Entries push-out of hard reference cache are transferred to // soft reference cache sSoftBitmapCache.put(eldest.getKey(), new SoftReference<Bitmap>(eldest.getValue())); return true; } else return false; } }; // Soft cache for bitmaps kicked out of hard cache private final static ConcurrentHashMap<String, SoftReference<Bitmap>> sSoftBitmapCache = new ConcurrentHashMap<String, SoftReference<Bitmap>>( HARD_CACHE_CAPACITY / 2); private final Handler purgeHandler = new Handler(Looper.getMainLooper()); private final Runnable purger = new Runnable() { public void run() { clearCache(); } }; /** * Adds this bitmap to the cache. * * @param bitmap * The newly downloaded bitmap. */ private void addBitmapToCache(String url, Bitmap bitmap) { if (bitmap != null) { synchronized (sHardBitmapCache) { sHardBitmapCache.put(url, bitmap); } } } /** * @param url * The URL of the image that will be retrieved from the cache. * @return The cached bitmap or null if it was not found. */ private Bitmap getBitmapFromCache(String url) { // First try the hard reference cache synchronized (sHardBitmapCache) { final Bitmap bitmap = sHardBitmapCache.get(url); if (bitmap != null) { // Bitmap found in hard cache // Move element to first position, so that it is removed last sHardBitmapCache.remove(url); sHardBitmapCache.put(url, bitmap); return bitmap; } } // Then try the soft reference cache SoftReference<Bitmap> bitmapReference = sSoftBitmapCache.get(url); if (bitmapReference != null) { final Bitmap bitmap = bitmapReference.get(); if (bitmap != null) { // Bitmap found in soft cache return bitmap; } else { // Soft reference has been Garbage Collected sSoftBitmapCache.remove(url); } } return null; } /** * * @ : getBitmapFromLocal * @ : * @ * @param url * * @return * * @ * @2013-1-5 4:19:23 * @ * */ public Bitmap getBitmapFromLocal(String url, String parentFullFileName) { try { String filename = parentFullFileName + File.separator + convertUrlToFileName(url); BitmapFactory.Options opt = new BitmapFactory.Options(); opt.inPreferredConfig = Bitmap.Config.RGB_565; opt.inPurgeable = true; opt.inInputShareable = true; Bitmap bitmap = BitmapFactory.decodeFile(filename, opt); if (bitmap != null) { sHardBitmapCache.put(convertUrlToFileName(url), bitmap); } return bitmap; } catch (Exception e) { return null; } } /** * * * * @param url * * @param parentFullFileName * * @param width * * @param height * * @return MyGoPlusV3 * * <pre> * * 2013-6-14 ? * </pre> */ public Bitmap getBitmapFromLocal(String url, String parentFullFileName, int width, int height) { String filename = parentFullFileName + File.separator + convertUrlToFileName(url); return loadResizedBitmap(filename, width, height); } /** * * * * @param filename * * @param width * * @param height * * @return MyGoPlusV3 * * <pre> * * 2013-6-14 ? * </pre> */ public Bitmap loadResizedBitmap(String filename, double width, double height) { Bitmap bitmap = null; BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; options.inPreferredConfig = Bitmap.Config.RGB_565; BitmapFactory.decodeFile(filename, options); if (options.outHeight > 0 && options.outWidth > 0) { options.inJustDecodeBounds = false; if (options.outWidth > width && options.outHeight > height) { double scaleWidth = options.outWidth / width; double scaleHeight = options.outHeight / height; double minScale = scaleWidth < scaleHeight ? scaleWidth : scaleHeight; options.inSampleSize = (int) minScale; } bitmap = BitmapFactory.decodeFile(filename, options); } return bitmap; } /** * Clears the image cache used internally to improve performance. Note that * for memory efficiency reasons, the cache will automatically be cleared * after a certain inactivity delay. */ public void clearCache() { sHardBitmapCache.clear(); sSoftBitmapCache.clear(); } /** * Allow a new delay before the automatic cache clear is done. */ private void resetPurgeTimer() { purgeHandler.removeCallbacks(purger); purgeHandler.postDelayed(purger, DELAY_BEFORE_PURGE); } /** * * * * @param in * * @param url * * @param isSaveLocal * * @param parentFullFileName * MyGoPlusV3 * * <pre> * * 2013-6-14 ? * </pre> */ public void saveInputStreamToSd(InputStream in, String url, boolean isSaveLocal, String parentFullFileName) { if (in == null || !isSaveLocal) { return; } if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) { // sdcard if (Constants.FREE_SD_SPACE_NEEDED_TO_CACHE < freeSpaceOnSd()) { removeCache(parentFullFileName); } String filename = convertUrlToFileName(url); File fileCachePath = new File(parentFullFileName); if (!fileCachePath.exists()) { fileCachePath.mkdir(); } // SD File file = new File(parentFullFileName + File.separator + filename); try { FileOutputStream fos = new FileOutputStream(file, false); byte buffer[] = new byte[4096]; int readsize = 0; while ((readsize = in.read(buffer)) > 0) { fos.write(buffer, 0, readsize); } } catch (FileNotFoundException e) { } catch (IOException e) { } } } /** * SD * **/ public void saveBmpToSd(Bitmap bm, String url, boolean isSaveLocal, String parentFullFileName) { if (bm == null || !isSaveLocal) { return; } if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) { // sdcard if (Constants.FREE_SD_SPACE_NEEDED_TO_CACHE < freeSpaceOnSd()) { removeCache(parentFullFileName); } String filename = convertUrlToFileName(url); File fileCachePath = new File(parentFullFileName); if (!fileCachePath.exists()) { fileCachePath.mkdir(); } // SD File file = new File(parentFullFileName + File.separator + filename); try { file.createNewFile(); OutputStream outStream = new FileOutputStream(file); bm.compress(Bitmap.CompressFormat.JPEG, 100, outStream); outStream.flush(); outStream.close(); } catch (FileNotFoundException e) { } catch (IOException e) { } // if (filename != null || bm != null) { sHardBitmapCache.put(filename, bm); } // SQLite } } /** * * @ : freeSpaceOnSd * @ : sdcard * @ * @return * * @ * @2012-10-20 12:18:41 * @ * */ private int freeSpaceOnSd() { StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getPath()); double sdFreeMB = ((double) stat.getAvailableBlocks() * (double) stat.getBlockSize()); return (int) sdFreeMB; } /** * @: URL * @param url * @return * @ xhf * @ 2012-7-10 02:53:48 * @V1.0 */ public String convertUrlToFileName(String url) { String[] strings = url.split("/"); String str = strings[strings.length - 1]; str = str.split("&")[0]; String regEx = "[`~!@#$%^&*()+=|{}':;',//[//]<>~@#%&*+|{}?]"; Pattern p = Pattern.compile(regEx); Matcher m = p.matcher(str); return m.replaceAll("").trim().toLowerCase(); // return str; } /** * *CACHE_SIZE * sdcardFREE_SD_SPACE_NEEDED_TO_CACHE * 40% * * @param dirPath * * @param filename * */ public void removeCache(String parentFullFileName) { File dir = new File(parentFullFileName); File[] files = dir.listFiles(); if (files == null) { return; } int dirSize = 0; for (int i = 0; i < files.length; i++) { // if(files[i].getName().contains(WHOLESALE_CONV)) { dirSize += files[i].length(); // } } if (dirSize > Constants.CACHE_SIZE * Constants.MB || Constants.FREE_SD_SPACE_NEEDED_TO_CACHE > freeSpaceOnSd()) { int removeFactor = (int) ((0.4 * files.length) + 1); Arrays.sort(files, new FileLastModifSort()); for (int i = 0; i < removeFactor; i++) { // if(files[i].getName().contains(WHOLESALE_CONV)) { files[i].delete(); // } } } } /** * * * */ class FileLastModifSort implements Comparator<File> { public int compare(File arg0, File arg1) { if (arg0.lastModified() > arg1.lastModified()) { return 1; } else if (arg0.lastModified() == arg1.lastModified()) { return 0; } else { return -1; } } } /** * * @ : readBitmap * @ : * @ * @param context * * @param id * * @return * * @ * @2012-12-19 9:53:48 * @ * */ public static Bitmap readBitmap(Context context, int id) throws OutOfMemoryError { BitmapFactory.Options opt = new BitmapFactory.Options(); opt.inPreferredConfig = Bitmap.Config.RGB_565;/* * ??????16?? * 565?????????? * ?????????????????? */ opt.inInputShareable = true; opt.inPurgeable = true;/* ?????????????????????????????? */ InputStream is = context.getResources().openRawResource(id); return BitmapFactory.decodeStream(is, null, opt); } }