/* * 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.android.contacts; import android.content.ComponentCallbacks2; import android.content.ContentResolver; import android.content.ContentUris; 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.Handler; import android.os.Handler.Callback; import android.os.HandlerThread; import android.os.Message; import android.provider.ContactsContract; import android.provider.ContactsContract.Contacts; import android.provider.ContactsContract.Contacts.Photo; import android.provider.ContactsContract.Data; import android.provider.ContactsContract.Directory; import android.text.TextUtils; import android.util.Log; import android.util.LruCache; import android.util.TypedValue; import android.widget.ImageView; import com.android.contacts.model.AccountTypeManager; import com.android.contacts.util.BitmapUtil; import com.android.contacts.util.MemoryUtils; import com.android.contacts.util.UriUtils; import com.google.common.collect.Lists; import com.google.common.collect.Sets; import java.io.ByteArrayOutputStream; import java.io.InputStream; import java.lang.ref.Reference; import java.lang.ref.SoftReference; 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 ComponentCallbacks2 { 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"; /** * 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 AccountTypeManager} with data bound from * the available authenticators. This method can safely be called from the UI thread. */ public static ContactPhotoManager getInstance(Context context) { Context applicationContext = context.getApplicationContext(); ContactPhotoManager service = (ContactPhotoManager) applicationContext.getSystemService(CONTACT_PHOTO_SERVICE); if (service == null) { service = createContactPhotoManager(applicationContext); Log.e(TAG, "No contact photo service in context: " + applicationContext); } return service; } 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(); // ComponentCallbacks2 @Override public void onConfigurationChanged(Configuration newConfig) { } // ComponentCallbacks2 @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 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 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 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 mPendingRequests = new ConcurrentHashMap(); /** * 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(bitmapCacheSize) { @Override protected int sizeOf(Object key, Bitmap value) { return value.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(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. */ 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) { numBitmaps++; bitmapBytes += b.getByteCount(); } } 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++; bitmapBytes += b.getByteCount(); } 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 (photoId == 0) { // No photo is needed defaultProvider.applyDefaultImage(view, -1, darkTheme); mPendingRequests.remove(view); } else { if (DEBUG) Log.d(TAG, "loadPhoto request: " + photoId); loadPhotoByIdOrUri(view, Request.createFromThumbnailId(photoId, darkTheme, defaultProvider)); } } @Override public void loadPhoto(ImageView view, Uri photoUri, int requestedExtent, boolean darkTheme, DefaultImageProvider defaultProvider) { if (photoUri == null) { // No photo is needed defaultProvider.applyDefaultImage(view, requestedExtent, darkTheme); mPendingRequests.remove(view); } else { if (DEBUG) Log.d(TAG, "loadPhoto request: " + photoUri); 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) if (cachedBitmap.getByteCount() < mBitmapCache.maxSize() / 6) { mBitmapCache.put(request.getKey(), cachedBitmap); } // Soften the reference holder.bitmap = null; 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); if (DEBUG) { Log.d(TAG, "inflateBitmap " + btk(bytes.length) + " -> " + bitmap.getWidth() + "x" + bitmap.getHeight() + ", " + btk(bitmap.getByteCount())); } } 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 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 ? "" : 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); 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 photoIds, Set photoIdsAsStrings, Set 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 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 mPhotoIds = Sets.newHashSet(); private final Set mPhotoIdsAsStrings = Sets.newHashSet(); private final Set mPhotoUris = Sets.newHashSet(); private final List mPreloadPhotoIds = Lists.newArrayList(); 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. *

* 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 = Contacts.CONTENT_URI.buildUpon().appendQueryParameter( ContactsContract.DIRECTORY_PARAM_KEY, String.valueOf(Directory.DEFAULT)) .appendQueryParameter(ContactsContract.LIMIT_PARAM_KEY, String.valueOf(MAX_PHOTOS_TO_PRELOAD)) .build(); cursor = mResolver.query(uri, new String[] { Contacts.PHOTO_ID }, Contacts.PHOTO_ID + " NOT NULL AND " + Contacts.PHOTO_ID + "!=0", null, Contacts.STARRED + " DESC, " + Contacts.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) { if (ContactsContract.isProfileId(id)) { Cursor profileCursor = null; try { profileCursor = mResolver.query( ContentUris.withAppendedId(Data.CONTENT_URI, id), COLUMNS, null, null, null); if (profileCursor != null && profileCursor.moveToFirst()) { cacheBitmap(profileCursor.getLong(0), profileCursor.getBlob(1), preloading, -1); } else { // Couldn't load a photo this way either. cacheBitmap(id, null, preloading, -1); } } finally { if (profileCursor != null) { profileCursor.close(); } } } else { // Not a profile photo and 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); } } }