Java tutorial
/* Copyright 2013-2014, Silent Circle, LLC. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Any redistribution, use, or modification is done solely for personal benefit and not for any commercial purpose or for monetary gain * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name Silent Circle nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SILENT CIRCLE, LLC BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * This implementation is edited version of original Android sources. */ /* * 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. */ package com.silentcircle.contacts; import android.annotation.TargetApi; import android.content.ComponentCallbacks; import android.content.ContentResolver; import android.content.Context; import android.content.res.Configuration; import android.content.res.Resources; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Paint.Style; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.ColorDrawable; import android.graphics.drawable.Drawable; import android.graphics.drawable.TransitionDrawable; import android.net.Uri; import android.os.Build; import android.os.Handler; import android.os.Handler.Callback; import android.os.HandlerThread; import android.os.Message; import android.support.v4.util.LruCache; import android.text.TextUtils; import android.util.Log; import android.util.TypedValue; import android.widget.ImageView; import com.silentcircle.contacts.utils.MemoryUtils; import com.silentcircle.contacts.R; import com.silentcircle.silentcontacts.ScContactsContract; import com.silentcircle.silentcontacts.ScContactsContract.CommonDataKinds.Photo; import com.silentcircle.silentcontacts.ScContactsContract.Data; import com.silentcircle.silentcontacts.ScContactsContract.Directory; import com.silentcircle.silentcontacts.ScContactsContract.RawContacts; import com.silentcircle.contacts.utils.BitmapUtil; import com.silentcircle.contacts.utils.UriUtils; import java.io.ByteArrayOutputStream; import java.io.InputStream; import java.lang.ref.Reference; import java.lang.ref.SoftReference; import java.util.ArrayList; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.Set; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.atomic.AtomicInteger; /** * Asynchronously loads contact photos and maintains a cache of photos. */ public abstract class ContactPhotoManager implements ComponentCallbacks { static final String TAG = "ContactPhotoManager"; static final boolean DEBUG = false; // Don't submit with true static final boolean DEBUG_SIZES = false; // Don't submit with true /** Caches 180dip in pixel. This is used to detect whether to show the hires or lores version * of the default avatar */ private static int s180DipInPixel = -1; public static final String CONTACT_PHOTO_SERVICE = "contactPhotos"; private static ContactPhotoManager mContactPhotoManager; /** * Returns the resource id of the default avatar. Tries to find a resource that is bigger * than the given extent (width or height). If extent=-1, a thumbnail avatar is returned */ public static int getDefaultAvatarResId(Context context, int extent, boolean darkTheme) { // TODO: Is it worth finding a nicer way to do hires/lores here? In practice, the // default avatar doesn't look too different when stretched if (s180DipInPixel == -1) { Resources r = context.getResources(); s180DipInPixel = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 180, r.getDisplayMetrics()); } final boolean hires = (extent != -1) && (extent > s180DipInPixel); return getDefaultAvatarResId(hires, darkTheme); } public static int getDefaultAvatarResId(boolean hires, boolean darkTheme) { if (hires && darkTheme) return R.drawable.ic_contact_picture_180_holo_dark; if (hires) return R.drawable.ic_contact_picture_180_holo_light; if (darkTheme) return R.drawable.ic_contact_picture_holo_dark; return R.drawable.ic_contact_picture_holo_light; } public static abstract class DefaultImageProvider { /** * Applies the default avatar to the ImageView. Extent is an indicator for the size (width * or height). If darkTheme is set, the avatar is one that looks better on dark background */ public abstract void applyDefaultImage(ImageView view, int extent, boolean darkTheme); } private static class AvatarDefaultImageProvider extends DefaultImageProvider { @Override public void applyDefaultImage(ImageView view, int extent, boolean darkTheme) { view.setImageResource(getDefaultAvatarResId(view.getContext(), extent, darkTheme)); } } private static class BlankDefaultImageProvider extends DefaultImageProvider { private static Drawable sDrawable; @Override public void applyDefaultImage(ImageView view, int extent, boolean darkTheme) { if (sDrawable == null) { Context context = view.getContext(); sDrawable = new ColorDrawable(context.getResources().getColor(R.color.image_placeholder)); } view.setImageDrawable(sDrawable); } } public static final DefaultImageProvider DEFAULT_AVATAR = new AvatarDefaultImageProvider(); public static final DefaultImageProvider DEFAULT_BLANK = new BlankDefaultImageProvider(); /** * Requests the singleton instance of {@link ContactPhotoManager}. This method can safely be called * from the UI thread. */ public static ContactPhotoManager getInstance(Context context) { if (mContactPhotoManager == null) { mContactPhotoManager = ContactPhotoManager.createContactPhotoManager(context); // API 14 context.registerComponentCallbacks(mContactPhotoManager); mContactPhotoManager.preloadPhotosInBackground(); } return mContactPhotoManager; } public static synchronized ContactPhotoManager createContactPhotoManager(Context context) { return new ContactPhotoManagerImpl(context); } /** * Load thumbnail image into the supplied image view. If the photo is already cached, * it is displayed immediately. Otherwise a request is sent to load the photo * from the database. */ public abstract void loadThumbnail(ImageView view, long photoId, boolean darkTheme, DefaultImageProvider defaultProvider); /** * Calls {@link #loadThumbnail(ImageView, long, boolean, DefaultImageProvider)} with * {@link #DEFAULT_AVATAR}. */ public final void loadThumbnail(ImageView view, long photoId, boolean darkTheme) { loadThumbnail(view, photoId, darkTheme, DEFAULT_AVATAR); } /** * Load photo into the supplied image view. If the photo is already cached, * it is displayed immediately. Otherwise a request is sent to load the photo * from the location specified by the URI. * @param view The target view * @param photoUri The uri of the photo to load * @param requestedExtent Specifies an approximate Max(width, height) of the targetView. * This is useful if the source image can be a lot bigger that the target, so that the decoding * is done using efficient sampling. If requestedExtent is specified, no sampling of the image * is performed * @param darkTheme Whether the background is dark. This is used for default avatars * @param defaultProvider The provider of default avatars (this is used if photoUri doesn't * refer to an existing image) */ public abstract void loadPhoto(ImageView view, Uri photoUri, int requestedExtent, boolean darkTheme, DefaultImageProvider defaultProvider); /** * Calls {@link #loadPhoto(ImageView, Uri, boolean, boolean, DefaultImageProvider)} with * {@link #DEFAULT_AVATAR}. */ public final void loadPhoto(ImageView view, Uri photoUri, int requestedExtent, boolean darkTheme) { loadPhoto(view, photoUri, requestedExtent, darkTheme, DEFAULT_AVATAR); } /** * Calls {@link #loadPhoto(ImageView, Uri, boolean, boolean, DefaultImageProvider)} with * {@link #DEFAULT_AVATAR} and with the assumption, that the image is a thumbnail */ public final void loadDirectoryPhoto(ImageView view, Uri photoUri, boolean darkTheme) { loadPhoto(view, photoUri, -1, darkTheme, DEFAULT_AVATAR); } /** * Remove photo from the supplied image view. This also cancels current pending load request * inside this photo manager. */ public abstract void removePhoto(ImageView view); /** * Temporarily stops loading photos from the database. */ public abstract void pause(); /** * Resumes loading photos from the database. */ public abstract void resume(); /** * Marks all cached photos for reloading. We can continue using cache but should * also make sure the photos haven't changed in the background and notify the views * if so. */ public abstract void refreshCache(); /** * Stores the given bitmap directly in the LRU bitmap cache. * @param photoUri The URI of the photo (for future requests). * @param bitmap The bitmap. * @param photoBytes The bytes that were parsed to create the bitmap. */ public abstract void cacheBitmap(Uri photoUri, Bitmap bitmap, byte[] photoBytes); /** * Initiates a background process that over time will fill up cache with * preload photos. */ public abstract void preloadPhotosInBackground(); // ComponentCallbacks @Override public void onConfigurationChanged(Configuration newConfig) { } // ComponentCallbacks @Override public void onLowMemory() { } // // ComponentCallbacks2 // @Override // public void onTrimMemory(int level) { // } } class ContactPhotoManagerImpl extends ContactPhotoManager implements Callback { private static final String LOADER_THREAD_NAME = "ContactPhotoLoader"; private static final int FADE_TRANSITION_DURATION = 200; /** * Type of message sent by the UI thread to itself to indicate that some photos * need to be loaded. */ private static final int MESSAGE_REQUEST_LOADING = 1; /** * Type of message sent by the loader thread to indicate that some photos have * been loaded. */ private static final int MESSAGE_PHOTOS_LOADED = 2; private static final String[] EMPTY_STRING_ARRAY = new String[0]; private static final String[] COLUMNS = new String[] { Photo._ID, Photo.PHOTO }; /** * Maintains the state of a particular photo. */ private static class BitmapHolder { final byte[] bytes; final int originalSmallerExtent; volatile boolean fresh; Bitmap bitmap; Reference<Bitmap> bitmapRef; int decodedSampleSize; public BitmapHolder(byte[] bytes, int originalSmallerExtent) { this.bytes = bytes; this.fresh = true; this.originalSmallerExtent = originalSmallerExtent; } } private final Context mContext; /** * An LRU cache for bitmap holders. The cache contains bytes for photos just * as they come from the database. Each holder has a soft reference to the * actual bitmap. */ private final LruCache<Object, BitmapHolder> mBitmapHolderCache; /** * {@code true} if ALL entries in {@link #mBitmapHolderCache} are NOT fresh. */ private volatile boolean mBitmapHolderCacheAllUnfresh = true; /** * Cache size threshold at which bitmaps will not be preloaded. */ private final int mBitmapHolderCacheRedZoneBytes; /** * Level 2 LRU cache for bitmaps. This is a smaller cache that holds * the most recently used bitmaps to save time on decoding * them from bytes (the bytes are stored in {@link #mBitmapHolderCache}. */ private final LruCache<Object, Bitmap> mBitmapCache; /** * A map from ImageView to the corresponding photo ID or uri, encapsulated in a request. * The request may swapped out before the photo loading request is started. */ private final ConcurrentHashMap<ImageView, Request> mPendingRequests = new ConcurrentHashMap<ImageView, Request>(); /** * Handler for messages sent to the UI thread. */ private final Handler mMainThreadHandler = new Handler(this); /** * Thread responsible for loading photos from the database. Created upon * the first request. */ private LoaderThread mLoaderThread; /** * A gate to make sure we only send one instance of MESSAGE_PHOTOS_NEEDED at a time. */ private boolean mLoadingRequested; /** * Flag indicating if the image loading is paused. */ private boolean mPaused; /** Cache size for {@link #mBitmapHolderCache} for devices with "large" RAM. */ private static final int HOLDER_CACHE_SIZE = 2000000; /** Cache size for {@link #mBitmapCache} for devices with "large" RAM. */ private static final int BITMAP_CACHE_SIZE = 36864 * 48; // 1728K private static final int LARGE_RAM_THRESHOLD = 640 * 1024 * 1024; /** For debug: How many times we had to reload cached photo for a stale entry */ private final AtomicInteger mStaleCacheOverwrite = new AtomicInteger(); /** For debug: How many times we had to reload cached photo for a fresh entry. Should be 0. */ private final AtomicInteger mFreshCacheOverwrite = new AtomicInteger(); public ContactPhotoManagerImpl(Context context) { mContext = context; final float cacheSizeAdjustment = (MemoryUtils.getTotalMemorySize() >= LARGE_RAM_THRESHOLD) ? 1.0f : 0.5f; final int bitmapCacheSize = (int) (cacheSizeAdjustment * BITMAP_CACHE_SIZE); mBitmapCache = new LruCache<Object, Bitmap>(bitmapCacheSize) { @Override @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1) protected int sizeOf(Object key, Bitmap data) { return (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB_MR1) ? (data.getRowBytes() * data.getHeight()) : data.getByteCount(); } @Override protected void entryRemoved(boolean evicted, Object key, Bitmap oldValue, Bitmap newValue) { if (DEBUG) dumpStats(); } }; final int holderCacheSize = (int) (cacheSizeAdjustment * HOLDER_CACHE_SIZE); mBitmapHolderCache = new LruCache<Object, BitmapHolder>(holderCacheSize) { @Override protected int sizeOf(Object key, BitmapHolder value) { return value.bytes != null ? value.bytes.length : 0; } @Override protected void entryRemoved(boolean evicted, Object key, BitmapHolder oldValue, BitmapHolder newValue) { if (DEBUG) dumpStats(); } }; mBitmapHolderCacheRedZoneBytes = (int) (holderCacheSize * 0.75); Log.i(TAG, "Cache adj: " + cacheSizeAdjustment); if (DEBUG) { Log.d(TAG, "Cache size: " + btk(mBitmapHolderCache.maxSize()) + " + " + btk(mBitmapCache.maxSize())); } } /** Converts bytes to K bytes, rounding up. Used only for debug log. */ private static String btk(int bytes) { return ((bytes + 1023) / 1024) + "K"; } private static final int safeDiv(int dividend, int divisor) { return (divisor == 0) ? 0 : (dividend / divisor); } /** * Dump cache stats on logcat. */ @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1) private void dumpStats() { if (!DEBUG) return; { int numHolders = 0; int rawBytes = 0; int bitmapBytes = 0; int numBitmaps = 0; for (BitmapHolder h : mBitmapHolderCache.snapshot().values()) { numHolders++; if (h.bytes != null) { rawBytes += h.bytes.length; } Bitmap b = h.bitmapRef != null ? h.bitmapRef.get() : null; if (b != null) { int bCount = (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB_MR1) ? b.getRowBytes() * b.getHeight() : b.getByteCount(); numBitmaps++; bitmapBytes += bCount; } } Log.d(TAG, "L1: " + btk(rawBytes) + " + " + btk(bitmapBytes) + " = " + btk(rawBytes + bitmapBytes) + ", " + numHolders + " holders, " + numBitmaps + " bitmaps, avg: " + btk(safeDiv(rawBytes, numHolders)) + "," + btk(safeDiv(bitmapBytes, numBitmaps))); Log.d(TAG, "L1 Stats: " + mBitmapHolderCache.toString() + ", overwrite: fresh=" + mFreshCacheOverwrite.get() + " stale=" + mStaleCacheOverwrite.get()); } { int numBitmaps = 0; int bitmapBytes = 0; for (Bitmap b : mBitmapCache.snapshot().values()) { numBitmaps++; int bCount = (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB_MR1) ? b.getRowBytes() * b.getHeight() : b.getByteCount(); bitmapBytes += bCount; } Log.d(TAG, "L2: " + btk(bitmapBytes) + ", " + numBitmaps + " bitmaps" + ", avg: " + btk(safeDiv(bitmapBytes, numBitmaps))); // We don't get from L2 cache, so L2 stats is meaningless. } } // @Override // public void onTrimMemory(int level) { // if (DEBUG) Log.d(TAG, "onTrimMemory: " + level); // if (level >= ComponentCallbacks2.TRIM_MEMORY_MODERATE) { // // Clear the caches. Note all pending requests will be removed too. // clear(); // } // } @Override public void preloadPhotosInBackground() { ensureLoaderThread(); mLoaderThread.requestPreloading(); } @Override public void loadThumbnail(ImageView view, long photoId, boolean darkTheme, DefaultImageProvider defaultProvider) { if (DEBUG) Log.d(TAG, "loadPhoto request: " + photoId); if (photoId == 0) { // No photo is needed defaultProvider.applyDefaultImage(view, -1, darkTheme); mPendingRequests.remove(view); } else { loadPhotoByIdOrUri(view, Request.createFromThumbnailId(photoId, darkTheme, defaultProvider)); } } @Override public void loadPhoto(ImageView view, Uri photoUri, int requestedExtent, boolean darkTheme, DefaultImageProvider defaultProvider) { if (DEBUG) Log.d(TAG, "loadPhoto request: " + photoUri + ", dark: " + darkTheme); if (photoUri == null) { // No photo is needed defaultProvider.applyDefaultImage(view, requestedExtent, darkTheme); mPendingRequests.remove(view); } else { loadPhotoByIdOrUri(view, Request.createFromUri(photoUri, requestedExtent, darkTheme, defaultProvider)); } } private void loadPhotoByIdOrUri(ImageView view, Request request) { boolean loaded = loadCachedPhoto(view, request, false); if (loaded) { mPendingRequests.remove(view); } else { mPendingRequests.put(view, request); if (!mPaused) { // Send a request to start loading photos requestLoading(); } } } @Override public void removePhoto(ImageView view) { view.setImageDrawable(null); mPendingRequests.remove(view); } @Override public void refreshCache() { if (mBitmapHolderCacheAllUnfresh) { if (DEBUG) Log.d(TAG, "refreshCache -- no fresh entries."); return; } if (DEBUG) Log.d(TAG, "refreshCache"); mBitmapHolderCacheAllUnfresh = true; for (BitmapHolder holder : mBitmapHolderCache.snapshot().values()) { holder.fresh = false; } } /** * Checks if the photo is present in cache. If so, sets the photo on the view. * * @return false if the photo needs to be (re)loaded from the provider. */ private boolean loadCachedPhoto(ImageView view, Request request, boolean fadeIn) { BitmapHolder holder = mBitmapHolderCache.get(request.getKey()); if (holder == null) { // The bitmap has not been loaded ==> show default avatar request.applyDefaultImage(view); return false; } if (holder.bytes == null) { request.applyDefaultImage(view); return holder.fresh; } Bitmap cachedBitmap = holder.bitmapRef == null ? null : holder.bitmapRef.get(); if (cachedBitmap == null) { if (holder.bytes.length < 8 * 1024) { // Small thumbnails are usually quick to inflate. Let's do that on the UI thread inflateBitmap(holder, request.getRequestedExtent()); cachedBitmap = holder.bitmap; if (cachedBitmap == null) return false; } else { // This is bigger data. Let's send that back to the Loader so that we can // inflate this in the background request.applyDefaultImage(view); return false; } } final Drawable previousDrawable = view.getDrawable(); if (fadeIn && previousDrawable != null) { final Drawable[] layers = new Drawable[2]; // Prevent cascade of TransitionDrawables. if (previousDrawable instanceof TransitionDrawable) { final TransitionDrawable previousTransitionDrawable = (TransitionDrawable) previousDrawable; layers[0] = previousTransitionDrawable .getDrawable(previousTransitionDrawable.getNumberOfLayers() - 1); } else { layers[0] = previousDrawable; } layers[1] = new BitmapDrawable(mContext.getResources(), cachedBitmap); TransitionDrawable drawable = new TransitionDrawable(layers); view.setImageDrawable(drawable); drawable.startTransition(FADE_TRANSITION_DURATION); } else { view.setImageBitmap(cachedBitmap); } // Put the bitmap in the LRU cache. But only do this for images that are small enough // (we require that at least six of those can be cached at the same time) int byteCount = (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB_MR1) ? cachedBitmap.getRowBytes() * cachedBitmap.getHeight() : cachedBitmap.getByteCount(); if (byteCount < mBitmapCache.maxSize() / 6) { mBitmapCache.put(request.getKey(), cachedBitmap); } holder.bitmap = null; // Soften the reference return holder.fresh; } /** * If necessary, decodes bytes stored in the holder to Bitmap. As long as the * bitmap is held either by {@link #mBitmapCache} or by a soft reference in * the holder, it will not be necessary to decode the bitmap. */ private static void inflateBitmap(BitmapHolder holder, int requestedExtent) { final int sampleSize = BitmapUtil.findOptimalSampleSize(holder.originalSmallerExtent, requestedExtent); byte[] bytes = holder.bytes; if (bytes == null || bytes.length == 0) { return; } if (sampleSize == holder.decodedSampleSize) { // Check the soft reference. If will be retained if the bitmap is also // in the LRU cache, so we don't need to check the LRU cache explicitly. if (holder.bitmapRef != null) { holder.bitmap = holder.bitmapRef.get(); if (holder.bitmap != null) { return; } } } try { Bitmap bitmap = BitmapUtil.decodeBitmapFromBytes(bytes, sampleSize); // make bitmap mutable and draw size onto it if (DEBUG_SIZES) { Bitmap original = bitmap; bitmap = bitmap.copy(bitmap.getConfig(), true); original.recycle(); Canvas canvas = new Canvas(bitmap); Paint paint = new Paint(); paint.setTextSize(16); paint.setColor(Color.BLUE); paint.setStyle(Style.FILL); canvas.drawRect(0.0f, 0.0f, 50.0f, 20.0f, paint); paint.setColor(Color.WHITE); paint.setAntiAlias(true); canvas.drawText(bitmap.getWidth() + "/" + sampleSize, 0, 15, paint); } holder.decodedSampleSize = sampleSize; holder.bitmap = bitmap; holder.bitmapRef = new SoftReference<Bitmap>(bitmap); if (DEBUG) { int bCount = (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB_MR1) ? bitmap.getRowBytes() * bitmap.getHeight() : bitmap.getByteCount(); Log.d(TAG, "inflateBitmap " + btk(bytes.length) + " -> " + bitmap.getWidth() + "x" + bitmap.getHeight() + ", " + btk(bCount)); } } catch (OutOfMemoryError e) { // Do nothing - the photo will appear to be missing } } public void clear() { if (DEBUG) Log.d(TAG, "clear"); mPendingRequests.clear(); mBitmapHolderCache.evictAll(); mBitmapCache.evictAll(); } @Override public void pause() { mPaused = true; } @Override public void resume() { mPaused = false; if (DEBUG) dumpStats(); if (!mPendingRequests.isEmpty()) { requestLoading(); } } /** * Sends a message to this thread itself to start loading images. If the current * view contains multiple image views, all of those image views will get a chance * to request their respective photos before any of those requests are executed. * This allows us to load images in bulk. */ private void requestLoading() { if (!mLoadingRequested) { mLoadingRequested = true; mMainThreadHandler.sendEmptyMessage(MESSAGE_REQUEST_LOADING); } } /** * Processes requests on the main thread. */ @Override public boolean handleMessage(Message msg) { switch (msg.what) { case MESSAGE_REQUEST_LOADING: { mLoadingRequested = false; if (!mPaused) { ensureLoaderThread(); mLoaderThread.requestLoading(); } return true; } case MESSAGE_PHOTOS_LOADED: { if (!mPaused) { processLoadedImages(); } if (DEBUG) dumpStats(); return true; } } return false; } public void ensureLoaderThread() { if (mLoaderThread == null) { mLoaderThread = new LoaderThread(mContext.getContentResolver()); mLoaderThread.start(); } } /** * Goes over pending loading requests and displays loaded photos. If some of the * photos still haven't been loaded, sends another request for image loading. */ private void processLoadedImages() { Iterator<ImageView> iterator = mPendingRequests.keySet().iterator(); while (iterator.hasNext()) { ImageView view = iterator.next(); Request key = mPendingRequests.get(view); boolean loaded = loadCachedPhoto(view, key, true); if (loaded) { iterator.remove(); } } softenCache(); if (!mPendingRequests.isEmpty()) { requestLoading(); } } /** * Removes strong references to loaded bitmaps to allow them to be garbage collected * if needed. Some of the bitmaps will still be retained by {@link #mBitmapCache}. */ private void softenCache() { for (BitmapHolder holder : mBitmapHolderCache.snapshot().values()) { holder.bitmap = null; } } /** * Stores the supplied bitmap in cache. */ private void cacheBitmap(Object key, byte[] bytes, boolean preloading, int requestedExtent) { if (DEBUG) { BitmapHolder prev = mBitmapHolderCache.get(key); if (prev != null && prev.bytes != null) { Log.d(TAG, "Overwriting cache: key=" + key + (prev.fresh ? " FRESH" : " stale")); if (prev.fresh) { mFreshCacheOverwrite.incrementAndGet(); } else { mStaleCacheOverwrite.incrementAndGet(); } } Log.d(TAG, "Caching data: key=" + key + ", " + (bytes == null ? "<null>" : btk(bytes.length))); } BitmapHolder holder = new BitmapHolder(bytes, bytes == null ? -1 : BitmapUtil.getSmallerExtentFromBytes(bytes)); // Unless this image is being preloaded, decode it right away while // we are still on the background thread. if (!preloading) { inflateBitmap(holder, requestedExtent); } mBitmapHolderCache.put(key, holder); mBitmapHolderCacheAllUnfresh = false; } @Override public void cacheBitmap(Uri photoUri, Bitmap bitmap, byte[] photoBytes) { final int smallerExtent = Math.min(bitmap.getWidth(), bitmap.getHeight()); // We can pretend here that the extent of the photo was the size that we originally // requested Request request = Request.createFromUri(photoUri, smallerExtent, false, DEFAULT_AVATAR); BitmapHolder holder = new BitmapHolder(photoBytes, smallerExtent); holder.bitmapRef = new SoftReference<Bitmap>(bitmap); mBitmapHolderCache.put(request.getKey(), holder); mBitmapHolderCacheAllUnfresh = false; mBitmapCache.put(request.getKey(), bitmap); } /** * Populates an array of photo IDs that need to be loaded. Also decodes bitmaps that we have * already loaded */ private void obtainPhotoIdsAndUrisToLoad(Set<Long> photoIds, Set<String> photoIdsAsStrings, Set<Request> uris) { photoIds.clear(); photoIdsAsStrings.clear(); uris.clear(); boolean jpegsDecoded = false; /* * Since the call is made from the loader thread, the map could be * changing during the iteration. That's not really a problem: * ConcurrentHashMap will allow those changes to happen without throwing * exceptions. Since we may miss some requests in the situation of * concurrent change, we will need to check the map again once loading * is complete. */ Iterator<Request> iterator = mPendingRequests.values().iterator(); while (iterator.hasNext()) { Request request = iterator.next(); final BitmapHolder holder = mBitmapHolderCache.get(request.getKey()); if (holder != null && holder.bytes != null && holder.fresh && (holder.bitmapRef == null || holder.bitmapRef.get() == null)) { // This was previously loaded but we don't currently have the inflated Bitmap inflateBitmap(holder, request.getRequestedExtent()); jpegsDecoded = true; } else { if (holder == null || !holder.fresh) { if (request.isUriRequest()) { uris.add(request); } else { photoIds.add(request.getId()); photoIdsAsStrings.add(String.valueOf(request.mId)); } } } } if (jpegsDecoded) mMainThreadHandler.sendEmptyMessage(MESSAGE_PHOTOS_LOADED); } /** * The thread that performs loading of photos from the database. */ private class LoaderThread extends HandlerThread implements Callback { private static final int BUFFER_SIZE = 1024 * 16; private static final int MESSAGE_PRELOAD_PHOTOS = 0; private static final int MESSAGE_LOAD_PHOTOS = 1; /** * A pause between preload batches that yields to the UI thread. */ private static final int PHOTO_PRELOAD_DELAY = 1000; /** * Number of photos to preload per batch. */ private static final int PRELOAD_BATCH = 25; /** * Maximum number of photos to preload. If the cache size is 2Mb and * the expected average size of a photo is 4kb, then this number should be 2Mb/4kb = 500. */ private static final int MAX_PHOTOS_TO_PRELOAD = 100; private final ContentResolver mResolver; private final StringBuilder mStringBuilder = new StringBuilder(); private final Set<Long> mPhotoIds = new HashSet<Long>(); private final Set<String> mPhotoIdsAsStrings = new HashSet<String>(); private final Set<Request> mPhotoUris = new HashSet<Request>(); private final List<Long> mPreloadPhotoIds = new ArrayList<Long>(); private Handler mLoaderThreadHandler; private byte mBuffer[]; private static final int PRELOAD_STATUS_NOT_STARTED = 0; private static final int PRELOAD_STATUS_IN_PROGRESS = 1; private static final int PRELOAD_STATUS_DONE = 2; private int mPreloadStatus = PRELOAD_STATUS_NOT_STARTED; public LoaderThread(ContentResolver resolver) { super(LOADER_THREAD_NAME); mResolver = resolver; } public void ensureHandler() { if (mLoaderThreadHandler == null) { mLoaderThreadHandler = new Handler(getLooper(), this); } } /** * Kicks off preloading of the next batch of photos on the background thread. * Preloading will happen after a delay: we want to yield to the UI thread * as much as possible. * <p> * If preloading is already complete, does nothing. */ public void requestPreloading() { if (mPreloadStatus == PRELOAD_STATUS_DONE) { return; } ensureHandler(); if (mLoaderThreadHandler.hasMessages(MESSAGE_LOAD_PHOTOS)) { return; } mLoaderThreadHandler.sendEmptyMessageDelayed(MESSAGE_PRELOAD_PHOTOS, PHOTO_PRELOAD_DELAY); } /** * Sends a message to this thread to load requested photos. Cancels a preloading * request, if any: we don't want preloading to impede loading of the photos * we need to display now. */ public void requestLoading() { ensureHandler(); mLoaderThreadHandler.removeMessages(MESSAGE_PRELOAD_PHOTOS); mLoaderThreadHandler.sendEmptyMessage(MESSAGE_LOAD_PHOTOS); } /** * Receives the above message, loads photos and then sends a message * to the main thread to process them. */ @Override public boolean handleMessage(Message msg) { switch (msg.what) { case MESSAGE_PRELOAD_PHOTOS: preloadPhotosInBackground(); break; case MESSAGE_LOAD_PHOTOS: loadPhotosInBackground(); break; } return true; } /** * The first time it is called, figures out which photos need to be preloaded. * Each subsequent call preloads the next batch of photos and requests * another cycle of preloading after a delay. The whole process ends when * we either run out of photos to preload or fill up cache. */ private void preloadPhotosInBackground() { if (mPreloadStatus == PRELOAD_STATUS_DONE) { return; } if (mPreloadStatus == PRELOAD_STATUS_NOT_STARTED) { queryPhotosForPreload(); if (mPreloadPhotoIds.isEmpty()) { mPreloadStatus = PRELOAD_STATUS_DONE; } else { mPreloadStatus = PRELOAD_STATUS_IN_PROGRESS; } requestPreloading(); return; } if (mBitmapHolderCache.size() > mBitmapHolderCacheRedZoneBytes) { mPreloadStatus = PRELOAD_STATUS_DONE; return; } mPhotoIds.clear(); mPhotoIdsAsStrings.clear(); int count = 0; int preloadSize = mPreloadPhotoIds.size(); while (preloadSize > 0 && mPhotoIds.size() < PRELOAD_BATCH) { preloadSize--; count++; Long photoId = mPreloadPhotoIds.get(preloadSize); mPhotoIds.add(photoId); mPhotoIdsAsStrings.add(photoId.toString()); mPreloadPhotoIds.remove(preloadSize); } loadThumbnails(true); if (preloadSize == 0) { mPreloadStatus = PRELOAD_STATUS_DONE; } Log.v(TAG, "Preloaded " + count + " photos. Cached bytes: " + mBitmapHolderCache.size()); requestPreloading(); } private void queryPhotosForPreload() { Cursor cursor = null; try { Uri uri = RawContacts.CONTENT_URI.buildUpon() .appendQueryParameter(ScContactsContract.DIRECTORY_PARAM_KEY, String.valueOf(Directory.DEFAULT)) .appendQueryParameter(ScContactsContract.LIMIT_PARAM_KEY, String.valueOf(MAX_PHOTOS_TO_PRELOAD)) .build(); cursor = mResolver.query(uri, new String[] { RawContacts.PHOTO_ID }, RawContacts.PHOTO_ID + " NOT NULL AND " + RawContacts.PHOTO_ID + "!=0", null, RawContacts.STARRED + " DESC, " + RawContacts.LAST_TIME_CONTACTED + " DESC"); if (cursor != null) { while (cursor.moveToNext()) { // Insert them in reverse order, because we will be taking // them from the end of the list for loading. mPreloadPhotoIds.add(0, cursor.getLong(0)); } } } finally { if (cursor != null) { cursor.close(); } } } private void loadPhotosInBackground() { obtainPhotoIdsAndUrisToLoad(mPhotoIds, mPhotoIdsAsStrings, mPhotoUris); loadThumbnails(false); loadUriBasedPhotos(); requestPreloading(); } /** Loads thumbnail photos with ids */ private void loadThumbnails(boolean preloading) { if (mPhotoIds.isEmpty()) { return; } // Remove loaded photos from the preload queue: we don't want // the preloading process to load them again. if (!preloading && mPreloadStatus == PRELOAD_STATUS_IN_PROGRESS) { for (Long id : mPhotoIds) { mPreloadPhotoIds.remove(id); } if (mPreloadPhotoIds.isEmpty()) { mPreloadStatus = PRELOAD_STATUS_DONE; } } mStringBuilder.setLength(0); mStringBuilder.append(Photo._ID + " IN("); for (int i = 0; i < mPhotoIds.size(); i++) { if (i != 0) { mStringBuilder.append(','); } mStringBuilder.append('?'); } mStringBuilder.append(')'); Cursor cursor = null; try { if (DEBUG) Log.d(TAG, "Loading " + TextUtils.join(",", mPhotoIdsAsStrings)); cursor = mResolver.query(Data.CONTENT_URI, COLUMNS, mStringBuilder.toString(), mPhotoIdsAsStrings.toArray(EMPTY_STRING_ARRAY), null); if (cursor != null) { while (cursor.moveToNext()) { Long id = cursor.getLong(0); byte[] bytes = cursor.getBlob(1); cacheBitmap(id, bytes, preloading, -1); mPhotoIds.remove(id); } } } finally { if (cursor != null) { cursor.close(); } } // Remaining photos were not found in the contacts database (but might be in profile). for (Long id : mPhotoIds) { // Not found - mark the cache accordingly cacheBitmap(id, null, preloading, -1); } mMainThreadHandler.sendEmptyMessage(MESSAGE_PHOTOS_LOADED); } /** * Loads photos referenced with Uris. Those can be remote thumbnails * (from directory searches), display photos etc */ private void loadUriBasedPhotos() { for (Request uriRequest : mPhotoUris) { Uri uri = uriRequest.getUri(); if (mBuffer == null) { mBuffer = new byte[BUFFER_SIZE]; } try { if (DEBUG) Log.d(TAG, "Loading " + uri); InputStream is = mResolver.openInputStream(uri); if (is != null) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); try { int size; while ((size = is.read(mBuffer)) != -1) { baos.write(mBuffer, 0, size); } } finally { is.close(); } cacheBitmap(uri, baos.toByteArray(), false, uriRequest.getRequestedExtent()); mMainThreadHandler.sendEmptyMessage(MESSAGE_PHOTOS_LOADED); } else { Log.v(TAG, "Cannot load photo " + uri); cacheBitmap(uri, null, false, uriRequest.getRequestedExtent()); } } catch (Exception ex) { Log.v(TAG, "Cannot load photo " + uri, ex); cacheBitmap(uri, null, false, uriRequest.getRequestedExtent()); } } } } /** * A holder for either a Uri or an id and a flag whether this was requested for the dark or * light theme */ private static final class Request { private final long mId; private final Uri mUri; private final boolean mDarkTheme; private final int mRequestedExtent; private final DefaultImageProvider mDefaultProvider; private Request(long id, Uri uri, int requestedExtent, boolean darkTheme, DefaultImageProvider defaultProvider) { mId = id; mUri = uri; mDarkTheme = darkTheme; mRequestedExtent = requestedExtent; mDefaultProvider = defaultProvider; } public static Request createFromThumbnailId(long id, boolean darkTheme, DefaultImageProvider defaultProvider) { return new Request(id, null /* no URI */, -1, darkTheme, defaultProvider); } public static Request createFromUri(Uri uri, int requestedExtent, boolean darkTheme, DefaultImageProvider defaultProvider) { return new Request(0 /* no ID */, uri, requestedExtent, darkTheme, defaultProvider); } public boolean isUriRequest() { return mUri != null; } public Uri getUri() { return mUri; } public long getId() { return mId; } public int getRequestedExtent() { return mRequestedExtent; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + (int) (mId ^ (mId >>> 32)); result = prime * result + mRequestedExtent; result = prime * result + ((mUri == null) ? 0 : mUri.hashCode()); return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; final Request that = (Request) obj; if (mId != that.mId) return false; if (mRequestedExtent != that.mRequestedExtent) return false; if (!UriUtils.areEqual(mUri, that.mUri)) return false; // Don't compare equality of mDarkTheme because it is only used in the default contact // photo case. When the contact does have a photo, the contact photo is the same // regardless of mDarkTheme, so we shouldn't need to put the photo request on the queue // twice. return true; } public Object getKey() { return mUri == null ? mId : mUri; } public void applyDefaultImage(ImageView view) { mDefaultProvider.applyDefaultImage(view, mRequestedExtent, mDarkTheme); } } }