在Glide解析一：Glide整體流程中亚亲，Glide的初始通過Glide.get()方法實(shí)現(xiàn)蒲肋，我們看下其源碼：
1、Glide.get獲取Glide單例的實(shí)現(xiàn)
public static Glide get(@NonNull Context context) {
if (glide == null) {
synchronized (Glide.class) {
if (glide == null) {
checkAndInitializeGlide(context);
}
}
}
return glide;
}
private static void checkAndInitializeGlide(@NonNull Context context) {
// In the thread running initGlide(), one or more classes may call Glide.get(context).
// Without this check, those calls could trigger infinite recursion.
if (isInitializing) {
//如果正在初始化中抑诸，則拋出異常
throw new IllegalStateException("You cannot call Glide.get() in registerComponents(),"
+ " use the provided Glide instance instead");
}
//標(biāo)識Glide正在初始化中
isInitializing = true;
//初始化Glide
initializeGlide(context);
//標(biāo)識Glide初始化完成
isInitializing = false;
}
Glide通過checkAndInitializeGlide方法台谊，檢測是否已經(jīng)初始化，如果還未初始化八酒，則先構(gòu)建Glide并初始化Glide
2空民、Glide.initializeGlide初始化Glide
private static void initializeGlide(@NonNull Context context) {
initializeGlide(context, new GlideBuilder());
}
@SuppressWarnings("deprecation")
private static void initializeGlide(@NonNull Context context, @NonNull GlideBuilder builder) {
Context applicationContext = context.getApplicationContext();
//獲取通過注解動態(tài)生成的的AppGlideModule的實(shí)現(xiàn)類
GeneratedAppGlideModule annotationGeneratedModule = getAnnotationGeneratedGlideModules();
//從Manifest獲取定義的GlideModule列表，新版本已經(jīng)廢棄
List<com.bumptech.glide.module.GlideModule> manifestModules = Collections.emptyList();
if (annotationGeneratedModule == null || annotationGeneratedModule.isManifestParsingEnabled()) {
manifestModules = new ManifestParser(applicationContext).parse();
}
//從注解動態(tài)生成的的AppGlideModule的實(shí)現(xiàn)類中去掉Manifest定義的GlideMoldue
if (annotationGeneratedModule != null
&& !annotationGeneratedModule.getExcludedModuleClasses().isEmpty()) {
Set<Class<?>> excludedModuleClasses =
annotationGeneratedModule.getExcludedModuleClasses();
Iterator<com.bumptech.glide.module.GlideModule> iterator = manifestModules.iterator();
while (iterator.hasNext()) {
com.bumptech.glide.module.GlideModule current = iterator.next();
if (!excludedModuleClasses.contains(current.getClass())) {
continue;
}
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "AppGlideModule excludes manifest GlideModule: " + current);
}
iterator.remove();
}
}
if (Log.isLoggable(TAG, Log.DEBUG)) {
for (com.bumptech.glide.module.GlideModule glideModule : manifestModules) {
Log.d(TAG, "Discovered GlideModule from manifest: " + glideModule.getClass());
}
}
//設(shè)置RequestManager的工廠類
RequestManagerRetriever.RequestManagerFactory factory =
annotationGeneratedModule != null
? annotationGeneratedModule.getRequestManagerFactory() : null;
builder.setRequestManagerFactory(factory);
//將Manifest定義的GlideModule中的配置選項(xiàng)設(shè)置到glideBuilder中
for (com.bumptech.glide.module.GlideModule module : manifestModules) {
module.applyOptions(applicationContext, builder);
}
//將注解動態(tài)生成的的AppGlideModule的實(shí)現(xiàn)類中的配置選項(xiàng)設(shè)置到glideBuilder中
if (annotationGeneratedModule != null) {
annotationGeneratedModule.applyOptions(applicationContext, builder);
}
//使用glideBuilde構(gòu)建生成Glide
Glide glide = builder.build(applicationContext);
//將Manifest定義的GlideModule中定義的Glide組件注冊到Glide中
for (com.bumptech.glide.module.GlideModule module : manifestModules) {
module.registerComponents(applicationContext, glide, glide.registry);
}
//將注解動態(tài)生成的的AppGlideModule的實(shí)現(xiàn)類中定義的Glide組件注冊到Glide中
if (annotationGeneratedModule != null) {
annotationGeneratedModule.registerComponents(applicationContext, glide, glide.registry);
}
//glide監(jiān)聽Application的組件生命周期
applicationContext.registerComponentCallbacks(glide);
Glide.glide = glide;
}
Glide的初始化主要有以下步驟：
- 使用反射動態(tài)創(chuàng)建注解定義AppGildeModule的實(shí)現(xiàn)類或者反射動態(tài)創(chuàng)建Manifest定義的GlideModule的實(shí)現(xiàn)類
- 將AppGlideModule的實(shí)現(xiàn)類或者GlideModule的實(shí)現(xiàn)類中的Glide的配置信息設(shè)置到GlideBuilder中
- 使用GlideBuilder根據(jù)配置信息構(gòu)建Glide對象
- 將AppGlideModule的實(shí)現(xiàn)類或者GlideModule的實(shí)現(xiàn)類的Glide組件注冊到glide中
- glide監(jiān)聽Application的組件生命周期
1.1羞迷、Glide.getAnnotationGeneratedGlideModules獲取注解已創(chuàng)建的glide模塊
private static GeneratedAppGlideModule getAnnotationGeneratedGlideModules() {
GeneratedAppGlideModule result = null;
try {
//反射創(chuàng)建GeneratedAppGlideModuleImpl
Class<GeneratedAppGlideModule> clazz =
(Class<GeneratedAppGlideModule>)
Class.forName("com.bumptech.glide.GeneratedAppGlideModuleImpl");
result = clazz.getDeclaredConstructor().newInstance();
}
//...
return result;
}
其核心就是反射創(chuàng)建GeneratedAppGlideModuleImpl實(shí)現(xiàn)類界轩，而GeneratedAppGlideModuleImpl只是我們自定義的AppGlideModule的，其他內(nèi)部都是調(diào)用自定義的AppGlideModule的方法衔瓮。
1.2浊猾、ManifestParser.parse從Manifest解析出GlideModule
public List<GlideModule> parse() {
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "Loading Glide modules");
}
List<GlideModule> modules = new ArrayList<>();
try {
//獲取應(yīng)用信息
ApplicationInfo appInfo = context.getPackageManager()
.getApplicationInfo(context.getPackageName(), PackageManager.GET_META_DATA);
if (appInfo.metaData == null) {
//應(yīng)用的metaData為空，即Manifest中定義的metadata
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "Got null app info metadata");
}
return modules;
}
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "Got app info metadata: " + appInfo.metaData);
}
for (String key : appInfo.metaData.keySet()) {
//遍歷Manifest中定義的metadata
if (GLIDE_MODULE_VALUE.equals(appInfo.metaData.get(key))) {
//如果是glide_module
//解析并反射創(chuàng)建定義glidemodule热鞍，然后加入GlideModule列表中
modules.add(parseModule(key));
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "Loaded Glide module: " + key);
}
}
}
}
//...
return modules;
}
@SuppressWarnings("deprecation")
private static GlideModule parseModule(String className) {
Class<?> clazz;
try {
//根據(jù)className創(chuàng)建Class對象
clazz = Class.forName(className);
} catch (ClassNotFoundException e) {
throw new IllegalArgumentException("Unable to find GlideModule implementation", e);
}
Object module = null;
try {
//反射創(chuàng)建GlideModule的實(shí)現(xiàn)類
module = clazz.getDeclaredConstructor().newInstance();
// These can't be combined until API minimum is 19.
}
//...
return (GlideModule) module;
}
動態(tài)生成Manifest定義的GlideModule顯示解析Manifest并創(chuàng)建定義的GlideModule葫慎，相比之下注解的方式少了解析Manifest的步驟，所以注解的方式相對比較高效碍现。
2幅疼、GlideBuilder.build構(gòu)建Glide對象
步驟1中，Glide是通過GlideBuilder進(jìn)行構(gòu)建的昼接，我們看下GlideBuilder的build實(shí)現(xiàn)
Glide build(@NonNull Context context) {
if (sourceExecutor == null) {
//默認(rèn)不自定義網(wǎng)絡(luò)加載線程池的情況下，使用默認(rèn)的網(wǎng)絡(luò)加載線程池
//創(chuàng)建網(wǎng)絡(luò)加載線程池對象
sourceExecutor = GlideExecutor.newSourceExecutor();
}
if (diskCacheExecutor == null) {
//默認(rèn)不自定義磁盤加載線程池的情況下悴晰，使用默認(rèn)的磁盤加載線程池
//創(chuàng)建磁盤加載線程池對象
diskCacheExecutor = GlideExecutor.newDiskCacheExecutor();
}
if (animationExecutor == null) {
//默認(rèn)不自定義動畫加載線程池的情況下慢睡，使用默認(rèn)的動畫加載線程池
//創(chuàng)建動畫加載線程池對象
animationExecutor = GlideExecutor.newAnimationExecutor();
}
if (memorySizeCalculator == null) {
//創(chuàng)建內(nèi)存大小計(jì)算器
memorySizeCalculator = new MemorySizeCalculator.Builder(context).build();
}
if (connectivityMonitorFactory == null) {
//創(chuàng)建默認(rèn)的網(wǎng)絡(luò)連接監(jiān)聽工廠類
connectivityMonitorFactory = new DefaultConnectivityMonitorFactory();
}
if (bitmapPool == null) {
//獲取Bitmap池的大小
int size = memorySizeCalculator.getBitmapPoolSize();
if (size > 0) {
//如果Bitmap池的大小大于0，采用LruBitmapPool
bitmapPool = new LruBitmapPool(size);
} else {
//如果Bitmap池的大小于小于或等于0铡溪，采用BitmapPoolAdapter
bitmapPool = new BitmapPoolAdapter();
}
}
if (arrayPool == null) {
//arrayPool是對數(shù)組池漂辐，主要用于圖片解析時(shí)存儲臨時(shí)數(shù)據(jù)用
//根據(jù)數(shù)組池的大小創(chuàng)建LruArrayPool
arrayPool = new LruArrayPool(memorySizeCalculator.getArrayPoolSizeInBytes());
}
if (memoryCache == null) {
//創(chuàng)建內(nèi)存緩存實(shí)現(xiàn)類
memoryCache = new LruResourceCache(memorySizeCalculator.getMemoryCacheSize());
}
if (diskCacheFactory == null) {
//創(chuàng)建磁盤緩存工廠類
diskCacheFactory = new InternalCacheDiskCacheFactory(context);
}
if (engine == null) {
//創(chuàng)建圖片加載引起對象
engine =
new Engine(
memoryCache,
diskCacheFactory,
diskCacheExecutor,
sourceExecutor,
GlideExecutor.newUnlimitedSourceExecutor(),
GlideExecutor.newAnimationExecutor(),
isActiveResourceRetentionAllowed);
}
//創(chuàng)建RequestManagerRetriever對象
RequestManagerRetriever requestManagerRetriever =
new RequestManagerRetriever(requestManagerFactory);
//創(chuàng)建Glide對象
return new Glide(
context,
engine,
memoryCache,
bitmapPool,
arrayPool,
requestManagerRetriever,
connectivityMonitorFactory,
logLevel,
defaultRequestOptions.lock(),
defaultTransitionOptions);
}
GlideBuilder在不指定線程池、緩存策略等的情況下棕硫，默認(rèn)為我們創(chuàng)建了網(wǎng)絡(luò)加載線程池髓涯、磁盤緩存加載線程池、動畫線程池哈扮、Bitmap池（用于復(fù)用）纬纪、數(shù)組池（用于復(fù)用）、內(nèi)存緩存滑肉、磁盤緩存包各、圖片加載引擎等。然后再創(chuàng)建Glide靶庙。
一些相關(guān)的點(diǎn)請具體看：
Glide解析九：MemorySizeCalculator的用途
Glide解析十：Bitmap是如何復(fù)用的
Glide解析十一：數(shù)組是如何復(fù)用的
3问畅、創(chuàng)建Glide時(shí)，都做了哪些事情
步驟2中創(chuàng)建Glide是在GlideBuilder的build方法new處理的，我們看下new Glide時(shí)护姆，Glide的構(gòu)造方法都做了哪些事情：
Glide(
@NonNull Context context,
@NonNull Engine engine,
@NonNull MemoryCache memoryCache,
@NonNull BitmapPool bitmapPool,
@NonNull ArrayPool arrayPool,
@NonNull RequestManagerRetriever requestManagerRetriever,
@NonNull ConnectivityMonitorFactory connectivityMonitorFactory,
int logLevel,
@NonNull RequestOptions defaultRequestOptions,
@NonNull Map<Class<?>, TransitionOptions<?, ?>> defaultTransitionOptions) {
//設(shè)置圖片加載引起
this.engine = engine;
//設(shè)置bitmap池
this.bitmapPool = bitmapPool;
//設(shè)置數(shù)組池
this.arrayPool = arrayPool;
//設(shè)置內(nèi)存緩存
this.memoryCache = memoryCache;
//設(shè)置requestManagerRetriever
this.requestManagerRetriever = requestManagerRetriever;
//設(shè)置網(wǎng)絡(luò)連接監(jiān)聽工廠類
this.connectivityMonitorFactory = connectivityMonitorFactory;
//獲取圖片解碼格式
DecodeFormat decodeFormat = defaultRequestOptions.getOptions().get(Downsampler.DECODE_FORMAT);
//創(chuàng)建Bitmap預(yù)填充對象
bitmapPreFiller = new BitmapPreFiller(memoryCache, bitmapPool, decodeFormat);
//獲取資源對象
final Resources resources = context.getResources();
//創(chuàng)建注冊對象
registry = new Registry();
// Right now we're only using this parser for HEIF images, which are only supported on OMR1+.
// If we need this for other file types, we should consider removing this restriction.
// Note that order here matters. We want to check the ExifInterface parser first for orientation
// and then fall back to DefaultImageHeaderParser for other fields.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
//android8.1之后支持heif圖片格式矾端，注冊ExifInterfaceImageHeaderParser用來解析heif圖片的方向信息
registry.register(new ExifInterfaceImageHeaderParser());
}
//注冊默認(rèn)DefaultImageHeaderParser用來解析圖片的格式、方向等信息
registry.register(new DefaultImageHeaderParser());
//創(chuàng)建圖片采樣Downsamples卵皂，用與解析圖片并根據(jù)圖片的方向進(jìn)行相應(yīng)的旋轉(zhuǎn)處理
Downsampler downsampler = new Downsampler(registry.getImageHeaderParsers(),
resources.getDisplayMetrics(), bitmapPool, arrayPool);
//創(chuàng)建gif圖片解析器ByteBufferGifDecoder秩铆，用于從輸入流中解析gif
ByteBufferGifDecoder byteBufferGifDecoder =
new ByteBufferGifDecoder(context, registry.getImageHeaderParsers(), bitmapPool, arrayPool);
//創(chuàng)建視頻解析器VideoDecoder，用于將assetfile或parcelfile的視頻文件解析成bitmap
ResourceDecoder<ParcelFileDescriptor, Bitmap> parcelFileDescriptorVideoDecoder =
VideoDecoder.parcel(bitmapPool);
//創(chuàng)建字節(jié)緩沖圖片解析器渐裂，用于從字節(jié)緩沖中解析出bitmap
ByteBufferBitmapDecoder byteBufferBitmapDecoder = new ByteBufferBitmapDecoder(downsampler);
//創(chuàng)建輸入流圖片解析器豺旬，用于從輸入流中解析出bitmap
StreamBitmapDecoder streamBitmapDecoder = new StreamBitmapDecoder(downsampler, arrayPool);
//創(chuàng)建Drawable圖片解析器， 用于從uri中解析出drawable
ResourceDrawableDecoder resourceDrawableDecoder =
new ResourceDrawableDecoder(context);
//創(chuàng)建app資源圖片加載器的工廠類柒凉，用于創(chuàng)建app資源圖片加載器族阅，并指明從資源圖片id中加載資源圖片的輸入流
ResourceLoader.StreamFactory resourceLoaderStreamFactory =
new ResourceLoader.StreamFactory(resources);
//創(chuàng)建app自身資源圖片加載器的工廠類，用于創(chuàng)建app資源圖片加載器膝捞，并指明從資源圖片id中加載資源圖片的uri
ResourceLoader.UriFactory resourceLoaderUriFactory =
new ResourceLoader.UriFactory(resources);
//創(chuàng)建app自身資源圖片加載器的工廠類坦刀，用于創(chuàng)建app資源圖片加載器，并指明從資源圖片id中加載資源圖片的ParcelFileDescriptor
ResourceLoader.FileDescriptorFactory resourceLoaderFileDescriptorFactory =
new ResourceLoader.FileDescriptorFactory(resources);
//創(chuàng)建app自身資源圖片加載器的工廠類蔬咬，用于創(chuàng)建app資源圖片加載器鲤遥，并指明從資源圖片id中加載資源圖片的AssetFileDescriptor
ResourceLoader.AssetFileDescriptorFactory resourceLoaderAssetFileDescriptorFactory =
new ResourceLoader.AssetFileDescriptorFactory(resources);
//創(chuàng)建bitmap編碼器，用于向輸出流寫bitmap
BitmapEncoder bitmapEncoder = new BitmapEncoder(arrayPool);
//創(chuàng)建bitmap轉(zhuǎn)換器林艘，用于將bitmap轉(zhuǎn)換成字節(jié)流
BitmapBytesTranscoder bitmapBytesTranscoder = new BitmapBytesTranscoder();
//創(chuàng)建gif轉(zhuǎn)換器盖奈，用于將gif轉(zhuǎn)換成字節(jié)流
GifDrawableBytesTranscoder gifDrawableBytesTranscoder = new GifDrawableBytesTranscoder();
ContentResolver contentResolver = context.getContentResolver();
registry
//注冊基于字節(jié)緩沖的圖片編碼器，用于將字節(jié)緩沖寫到文件中
.append(ByteBuffer.class, new ByteBufferEncoder())
//注冊基于輸入流的圖片編碼器狐援，用于將輸入流寫到磁盤中
.append(InputStream.class, new StreamEncoder(arrayPool))
/* Bitmaps */
//注冊將字節(jié)緩沖解碼成Bitmap的圖片解碼器
.append(Registry.BUCKET_BITMAP, ByteBuffer.class, Bitmap.class, byteBufferBitmapDecoder)
//注冊將輸入流解碼成Bitmap的圖片解碼器
.append(Registry.BUCKET_BITMAP, InputStream.class, Bitmap.class, streamBitmapDecoder)
//注冊將ParcelFileDescriptor解碼成Bitmap的圖片解碼器
.append(
Registry.BUCKET_BITMAP,
ParcelFileDescriptor.class,
Bitmap.class,
parcelFileDescriptorVideoDecoder)
//注冊將AssetFileDescriptor解碼成Bitmap的圖片解碼器
.append(
Registry.BUCKET_BITMAP,
AssetFileDescriptor.class,
Bitmap.class,
VideoDecoder.asset(bitmapPool))
//注冊將Bitmap解碼成Bitmap的圖片解碼器
.append(Bitmap.class, Bitmap.class, UnitModelLoader.Factory.<Bitmap>getInstance())
.append(
Registry.BUCKET_BITMAP, Bitmap.class, Bitmap.class, new UnitBitmapDecoder())
.append(Bitmap.class, bitmapEncoder)
/* BitmapDrawables */
//注冊各種轉(zhuǎn)換成BitmapDrawable的圖片解碼器
.append(
Registry.BUCKET_BITMAP_DRAWABLE,
ByteBuffer.class,
BitmapDrawable.class,
new BitmapDrawableDecoder<>(resources, byteBufferBitmapDecoder))
.append(
Registry.BUCKET_BITMAP_DRAWABLE,
InputStream.class,
BitmapDrawable.class,
new BitmapDrawableDecoder<>(resources, streamBitmapDecoder))
.append(
Registry.BUCKET_BITMAP_DRAWABLE,
ParcelFileDescriptor.class,
BitmapDrawable.class,
new BitmapDrawableDecoder<>(resources, parcelFileDescriptorVideoDecoder))
.append(BitmapDrawable.class, new BitmapDrawableEncoder(bitmapPool, bitmapEncoder))
/* GIFs */
//注冊各種轉(zhuǎn)換成gif的圖片解碼器
.append(
Registry.BUCKET_GIF,
InputStream.class,
GifDrawable.class,
new StreamGifDecoder(registry.getImageHeaderParsers(), byteBufferGifDecoder, arrayPool))
.append(Registry.BUCKET_GIF, ByteBuffer.class, GifDrawable.class, byteBufferGifDecoder)
.append(GifDrawable.class, new GifDrawableEncoder())
/* GIF Frames */
// Compilation with Gradle requires the type to be specified for UnitModelLoader here.
.append(
GifDecoder.class, GifDecoder.class, UnitModelLoader.Factory.<GifDecoder>getInstance())
.append(
Registry.BUCKET_BITMAP,
GifDecoder.class,
Bitmap.class,
new GifFrameResourceDecoder(bitmapPool))
/* Drawables */
.append(Uri.class, Drawable.class, resourceDrawableDecoder)
.append(
Uri.class, Bitmap.class, new ResourceBitmapDecoder(resourceDrawableDecoder, bitmapPool))
/* Files */
注冊各種解析圖片文件的圖片加載器和圖片解碼器
.register(new ByteBufferRewinder.Factory())
.append(File.class, ByteBuffer.class, new ByteBufferFileLoader.Factory())
.append(File.class, InputStream.class, new FileLoader.StreamFactory())
.append(File.class, File.class, new FileDecoder())
.append(File.class, ParcelFileDescriptor.class, new FileLoader.FileDescriptorFactory())
// Compilation with Gradle requires the type to be specified for UnitModelLoader here.
//注冊各種圖片加載器
.append(File.class, File.class, UnitModelLoader.Factory.<File>getInstance())
/* Models */
.register(new InputStreamRewinder.Factory(arrayPool))
//注冊將Integer轉(zhuǎn)成InputStream的圖片加載器工廠類
.append(int.class, InputStream.class, resourceLoaderStreamFactory)
//注冊將int轉(zhuǎn)成ParcelFileDescriptor的圖片加載器工廠類
.append(
int.class,
ParcelFileDescriptor.class,
resourceLoaderFileDescriptorFactory)
//注冊將Integer轉(zhuǎn)成InputStream的圖片加載器工廠類
.append(Integer.class, InputStream.class, resourceLoaderStreamFactory)
//注冊將Integer轉(zhuǎn)成ParcelFileDescriptor的圖片加載器工廠類
.append(
Integer.class,
ParcelFileDescriptor.class,
resourceLoaderFileDescriptorFactory)
.append(Integer.class, Uri.class, resourceLoaderUriFactory)
//注冊將int轉(zhuǎn)成AssetFileDescriptor的圖片加載器工廠類
.append(
int.class,
AssetFileDescriptor.class,
resourceLoaderAssetFileDescriptorFactory)
//注冊將Integer轉(zhuǎn)成AssetFileDescriptor的圖片加載器工廠類
.append(
Integer.class,
AssetFileDescriptor.class,
resourceLoaderAssetFileDescriptorFactory)
//注冊將int轉(zhuǎn)成Uri的圖片加載器工廠類
.append(int.class, Uri.class, resourceLoaderUriFactory)
//注冊將String轉(zhuǎn)成輸入流的圖片加載器工廠類
.append(String.class, InputStream.class, new DataUrlLoader.StreamFactory<String>())
//注冊將Uri轉(zhuǎn)成輸入流的圖片加載器工廠類
.append(Uri.class, InputStream.class, new DataUrlLoader.StreamFactory<Uri>())
.append(String.class, InputStream.class, new StringLoader.StreamFactory())
//注冊將String轉(zhuǎn)成ParcelFileDescriptor的圖片加載器工廠類
.append(String.class, ParcelFileDescriptor.class, new StringLoader.FileDescriptorFactory())
//注冊將String轉(zhuǎn)成AssetFileDescriptor的圖片加載器工廠類
.append(
String.class, AssetFileDescriptor.class, new StringLoader.AssetFileDescriptorFactory())
.append(Uri.class, InputStream.class, new HttpUriLoader.Factory())
//注冊將Uri轉(zhuǎn)成輸入流的圖片加載器工廠類
.append(Uri.class, InputStream.class, new AssetUriLoader.StreamFactory(context.getAssets()))
//注冊將Uri轉(zhuǎn)成ParcelFileDescriptor的圖片加載器工廠類
.append(
Uri.class,
ParcelFileDescriptor.class,
new AssetUriLoader.FileDescriptorFactory(context.getAssets()))
//注冊將Uri轉(zhuǎn)成輸入流的圖片加載器工廠類
.append(Uri.class, InputStream.class, new MediaStoreImageThumbLoader.Factory(context))
//注冊將Uri轉(zhuǎn)成輸入流的圖片加載器工廠類
.append(Uri.class, InputStream.class, new MediaStoreVideoThumbLoader.Factory(context))
//注冊將Uri轉(zhuǎn)成輸入流的圖片加載器工廠類
.append(
Uri.class,
InputStream.class,
new UriLoader.StreamFactory(contentResolver))
//注冊將Uri轉(zhuǎn)成ParcelFileDescriptor的圖片加載器工廠類
.append(
Uri.class,
ParcelFileDescriptor.class,
new UriLoader.FileDescriptorFactory(contentResolver))
//注冊將Uri轉(zhuǎn)成AssetFileDescriptor的圖片加載器工廠類
.append(
Uri.class,
AssetFileDescriptor.class,
new UriLoader.AssetFileDescriptorFactory(contentResolver))
//注冊將Uri轉(zhuǎn)成輸入流的圖片加載器工廠類
.append(Uri.class, InputStream.class, new UrlUriLoader.StreamFactory())
//注冊將URL轉(zhuǎn)成輸入流的圖片加載器工廠類
.append(URL.class, InputStream.class, new UrlLoader.StreamFactory())
//注冊將Uri轉(zhuǎn)成文件的圖片加載器工廠類
.append(Uri.class, File.class, new MediaStoreFileLoader.Factory(context))
//注冊將GlideUrl轉(zhuǎn)成輸入流的圖片加載器工廠類
.append(GlideUrl.class, InputStream.class, new HttpGlideUrlLoader.Factory())
//注冊將byte[]轉(zhuǎn)成字節(jié)緩沖的圖片加載器工廠類
.append(byte[].class, ByteBuffer.class, new ByteArrayLoader.ByteBufferFactory())
//注冊將byte[]轉(zhuǎn)成輸入流的圖片加載器工廠類
.append(byte[].class, InputStream.class, new ByteArrayLoader.StreamFactory())
//注冊將Uri轉(zhuǎn)成Uri的圖片加載器工廠類
.append(Uri.class, Uri.class, UnitModelLoader.Factory.<Uri>getInstance())
//注冊將Drawable轉(zhuǎn)成Drawable的圖片加載器工廠類
.append(Drawable.class, Drawable.class, UnitModelLoader.Factory.<Drawable>getInstance())
//注冊將Drawable轉(zhuǎn)成Drawable的解碼器
.append(Drawable.class, Drawable.class, new UnitDrawableDecoder())
/* Transcoders */
//注冊將Bitmap轉(zhuǎn)換成BitmapDrawable的轉(zhuǎn)換器
.register(
Bitmap.class,
BitmapDrawable.class,
new BitmapDrawableTranscoder(resources))
//注冊將bitmap轉(zhuǎn)換成byte[]的轉(zhuǎn)碼器
.register(Bitmap.class, byte[].class, bitmapBytesTranscoder)
//注冊將Drawable轉(zhuǎn)成byte[]的轉(zhuǎn)碼器
.register(
Drawable.class,
byte[].class,
new DrawableBytesTranscoder(
bitmapPool, bitmapBytesTranscoder, gifDrawableBytesTranscoder))轉(zhuǎn)換器
//注冊將gift轉(zhuǎn)換成byte[]的轉(zhuǎn)碼器
.register(GifDrawable.class, byte[].class, gifDrawableBytesTranscoder);
//創(chuàng)建ImageView包裹類钢坦，主要用于圖片加載成功設(shè)置圖片、獲取圖片大小等
ImageViewTargetFactory imageViewTargetFactory = new ImageViewTargetFactory();
//創(chuàng)建專屬Glide的上下文
glideContext =
new GlideContext(
context,
arrayPool,
registry,
imageViewTargetFactory,
defaultRequestOptions,
defaultTransitionOptions,
engine,
logLevel);
}
總結(jié)一下Glide初始化的流程：
- 解析注解定義的AppGlideModule或者M(jìn)anifest定義的GlideModule啥酱，將其對應(yīng)的配置信息設(shè)置給GlideBuilder
- GlideBuilder設(shè)置一些默認(rèn)的配置信息爹凹，比如網(wǎng)絡(luò)線程池、磁盤線程池镶殷、動畫線程池禾酱、內(nèi)存緩存、磁盤緩存等
- GlideBuilder構(gòu)建Glide绘趋，在創(chuàng)建Glide時(shí)注冊了各種用于圖片加載颤陶、解碼、編碼的圖片加載器埋心、圖片解碼器指郁、圖片編碼器等
- 將AppGlideModule和GlideModule自定義的圖片加載、解碼器拷呆、編碼器注冊到Glide中
- 監(jiān)聽Application的生命周期
這里Glide的初始化主要使用單例闲坎、構(gòu)建等設(shè)計(jì)模式
