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一个充分利用原生图片库能力、高扩展性的flutter图片库。
特点：
支持加载 ui.Image 能力。在基于外接纹理的方案中，使用方无法拿到真正的 ui.Image 去使用，这导致图片库在这种特殊的使用场景下无能为力。
支持图片预加载能力。正如原生precacheImage一样。这在某些对图片展示速度要求较高的场景下非常有用。
新增纹理缓存，与原生图片库缓存打通！统一图片缓存，避免原生图片混用带来的内存问题。
支持模拟器。在 flutter-1.23.0-18.1.pre之前的版本，模拟器无法展示 Texture Widget。
完善自定义图片类型通道。解决业务自定义图片获取诉求。
完善的异常捕获与收集。
支持动图。（来自淘特的 PR）
将下方配置加入到 pubspec.yaml 文件中:
dependencies:
power_image: 0.1.0-pre.2
dependency_overrides:
power_image_ext: 2.5.3
或者直接引用 GitHub 源码：
dependencies:
power_image:
git:
url: 'git@github.com:alibaba/power_image.git'
ref: '0.1.0-pre.2'
dependency_overrides:
power_image_ext:
git:
url: 'git@github.com:alibaba/power_image_ext.git'
ref: '2.5.3'
ImageCacheExt替换 ImageCache ./// call before runApp()
PowerImageBinding();
or
/// return ImageCacheExt in createImageCache(),
/// if you have extends with WidgetsFlutterBinding
class XXX extends WidgetsFlutterBinding {
@override
ImageCache createImageCache() {
return ImageCacheExt();
}
}
初始化并设置全局的默认的渲染方式，renderingTypeTexture为texture方式，renderingTypeExternal为ffi方式
另外PowerImageSetupOptions里面也有异常上报，以及异常上报采样率。
PowerImageLoader.instance.setup(PowerImageSetupOptions(renderingTypeTexture,
errorCallbackSamplingRate: 1.0,
errorCallback: (PowerImageLoadException exception) {
}));
PowerImage 提供了基础的图片类型，包括网络图（network）、文件（file）、native 资源（nativeAsset）、flutter 资源（asset），使用方需要自定义对应的加载器。
[[PowerImageLoader sharedInstance] registerImageLoader:[PowerImageNetworkImageLoader new] forType:kPowerImageImageTypeNetwork];
[[PowerImageLoader sharedInstance] registerImageLoader:[PowerImageAssetsImageLoader new] forType:kPowerImageImageTypeNativeAsset];
[[PowerImageLoader sharedInstance] registerImageLoader:[PowerImageFlutterAssertImageLoader new] forType:kPowerImageImageTypeAsset];
[[PowerImageLoader sharedInstance] registerImageLoader:[PowerImageFileImageLoader new] forType:kPowerImageImageTypeFile];
PowerImageLoader.sharedInstance().register(PowerImageNetworkImageLoader.init(), forType: kPowerImageImageTypeNetwork)
PowerImageLoader.sharedInstance().register(PowerImageAssetsImageLoader.init(), forType: kPowerImageImageTypeNativeAsset)
PowerImageLoader.sharedInstance().register(PowerImageFlutterAssertImageLoader.init(), forType: kPowerImageImageTypeAsset)
PowerImageLoader.sharedInstance().register(PowerImageFileImageLoader.init(), forType: kPowerImageImageTypeFile)
loader 需要遵循 PowerImageLoaderProtocol 协议：
typedef void(^PowerImageLoaderCompletionBlock)(BOOL success, PowerImageResult *imageResult);
@protocol PowerImageLoaderProtocol <NSObject>
@required
- (void)handleRequest:(PowerImageRequestConfig *)requestConfig completed:(PowerImageLoaderCompletionBlock)completedBlock;
@end
Network image loader example:
- (void)handleRequest:(PowerImageRequestConfig *)requestConfig completed:(PowerImageLoaderCompletionBlock)completedBlock {
/// CDN optimization, you need transfer reqSize to native image loader!
/// CDN optimization, you need transfer reqSize to native image loader!
/// like this: [[SDWebImageManager sharedManager] downloadImageWithURL:[NSURL URLWithString:requestConfig.srcString] viewSize:reqSize completed:
CGSize reqSize = requestConfig.originSize;
/// attention.
[[SDWebImageManager sharedManager] loadImageWithURL:[NSURL URLWithString:requestConfig.srcString] options:nil progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
} completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
if (image != nil) {
completedBlock([PowerImageResult successWithImage:image]);
}else {
completedBlock([PowerImageResult failWithMessage:error.localizedDescription]);
}
}];
}
func handleRequest(_ requestConfig: PowerImageRequestConfig!, completed completedBlock: PowerImageLoaderCompletionBlock!) {
let reqSize:CGSize = requestConfig.originSize
let url = URL(string: requestConfig.srcString())
SDWebImageManager.shared.loadImage(with: url, progress: nil) { image, data, error, cacheType, finished, url in
if let image = image {
if (image.sd_isAnimated) {
let frames:[SDImageFrame] = SDImageCoderHelper.frames(from: image)!
if frames.count > 0 {
var arr:[PowerImageFrame] = []
for index in 0..<frames.count {
let frame:SDImageFrame = frames[index]
arr.append(PowerImageFrame(image: frame.image, duration: frame.duration))
}
let flutterImage = PowerFlutterMultiFrameImage(image: image, frames: arr)
completedBlock(PowerImageResult.success(with: flutterImage))
return
}
}
completedBlock(PowerImageResult.success(with: image))
}else{
completedBlock(PowerImageResult.fail(withMessage: error?.localizedDescription ?? "PowerImageNetworkLoaderError!"))
}
}
}
native asset loader example:
- (void)handleRequest:(PowerImageRequestConfig *)requestConfig completed:(PowerImageLoaderCompletionBlock)completedBlock {
UIImage *image = [UIImage imageNamed:requestConfig.srcString];
if (image) {
completedBlock([PowerImageResult successWithImage:image]);
}else {
completedBlock([PowerImageResult failWithMessage:@"MyAssetsImageLoader UIImage imageNamed: nil"]);
}
}
func handleRequest(_ requestConfig: PowerImageRequestConfig!, completed completedBlock: PowerImageLoaderCompletionBlock!) {
let image = UIImage(named: requestConfig.srcString())
if let image = image {
completedBlock(PowerImageResult.success(with: image))
}else{
completedBlock(PowerImageResult.fail(withMessage: "PowerImageAssetsImageLoaderError!"))
}
}
flutter asset loader example:
- (void)handleRequest:(PowerImageRequestConfig *)requestConfig completed:(PowerImageLoaderCompletionBlock)completedBlock {
UIImage *image = [self flutterImageWithName:requestConfig];
if (image) {
completedBlock([PowerImageResult successWithImage:image]);
} else {
completedBlock([PowerImageResult failWithMessage:@"flutterImageWithName nil"]);
}
}
- (UIImage*)flutterImageWithName:(PowerImageRequestConfig *)requestConfig {
NSString *name = requestConfig.srcString;
NSString *package = requestConfig.src[@"package"];
NSString *filename = [name lastPathComponent];
NSString *path = [name stringByDeletingLastPathComponent];
for (int screenScale = [UIScreen mainScreen].scale; screenScale > 1; --screenScale) {
NSString *key = [self lookupKeyForAsset:[NSString stringWithFormat:@"%@/%d.0x/%@", path, screenScale, filename] fromPackage:package];
UIImage *image = [UIImage imageNamed:key inBundle:[NSBundle mainBundle] compatibleWithTraitCollection:nil];
if (image) {
return image;
}
}
NSString *key = [self lookupKeyForAsset:name fromPackage:package];
/// webp iOS < 14 not support
if ([name hasSuffix:@".webp"] && !(@available(ios 14.0, *))) {
NSString *mPath = [[NSBundle mainBundle] pathForResource:key ofType:nil];
NSData *webpData = [NSData dataWithContentsOfFile:mPath];
return [UIImage sd_imageWithWebPData:webpData];
}
return [UIImage imageNamed:key inBundle:[NSBundle mainBundle] compatibleWithTraitCollection:nil];
}
- (NSString *)lookupKeyForAsset:(NSString *)asset fromPackage:(NSString *)package {
if (package && [package isKindOfClass:[NSString class]] && ![package isEqualToString:@""]) {
return [FlutterDartProject lookupKeyForAsset:asset fromPackage:package];
}else {
return [FlutterDartProject lookupKeyForAsset:asset];
}
}
func handleRequest(_ requestConfig: PowerImageRequestConfig!, completed completedBlock: PowerImageLoaderCompletionBlock!) {
let image = self.flutterImage(requestConfig: requestConfig)
if let image = image {
completedBlock(PowerImageResult.success(with: image))
}else {
completedBlock(PowerImageResult.fail(withMessage: "PowerImageFlutterAssertImageLoaderError"))
}
}
private func flutterImage(requestConfig:PowerImageRequestConfig) -> UIImage? {
let name:String = requestConfig.srcString()!
let package:String? = requestConfig.src["package"] as? String
let fileName:String = NSString(string: name).lastPathComponent
let path:String = NSString(string: name).deletingLastPathComponent
let scaleArr:[Int] = (2...Int(UIScreen.main.scale)).reversed()
for scale in scaleArr {
let key:String = self.lookupKeyForAsset(asset: String(format: "%s/%d.0x/%s", path,scale,fileName), package: package)
let image = UIImage(named: key,in: Bundle.main,compatibleWith: nil)
if image != nil {
return image!
}
}
let key = self.lookupKeyForAsset(asset: name, package: package)
return UIImage(named: key,in: Bundle.main,compatibleWith: nil)
}
private func lookupKeyForAsset(asset:String,package:String?) -> String {
if let package = package, package != "" {
return FlutterDartProject.lookupKey(forAsset: asset,fromPackage: package)
}else{
return FlutterDartProject.lookupKey(forAsset: asset)
}
}
file loader example:
- (void)handleRequest:(PowerImageRequestConfig *)requestConfig completed:(PowerImageLoaderCompletionBlock)completedBlock {
UIImage *image = [[UIImage alloc] initWithContentsOfFile:requestConfig.srcString];
if (image) {
completedBlock([PowerImageResult successWithImage:image]);
} else {
completedBlock([PowerImageResult failWithMessage:@"UIImage initWithContentsOfFile nil"]);
}
}
func handleRequest(_ requestConfig: PowerImageRequestConfig!, completed completedBlock: PowerImageLoaderCompletionBlock!) {
let image = UIImage(contentsOfFile: requestConfig.srcString())
if let image = image {
completedBlock(PowerImageResult.success(with: image))
}else{
completedBlock(PowerImageResult.fail(withMessage: "PowerImageFileImageLoaderError!"))
}
}
PowerImage 提供了基础的图片类型，包括网络图（network）、文件（file）、native 资源（nativeAsset）、flutter 资源（asset），使用方需要自定义对应的加载器。
PowerImageLoader.getInstance().registerImageLoader(
new PowerImageNetworkLoader(this.getApplicationContext()), "network");
PowerImageLoader.getInstance().registerImageLoader(
new PowerImageNativeAssetLoader(this.getApplicationContext()), "nativeAsset");
PowerImageLoader.getInstance().registerImageLoader(
new PowerImageFlutterAssetLoader(this.getApplicationContext()), "asset");
PowerImageLoader.getInstance().registerImageLoader(
new PowerImageFileLoader(this.getApplicationContext()), "file");
PowerImageLoader.getInstance().registerImageLoader(
PowerImageNetworkLoader(this.applicationContext), "network"
)
PowerImageLoader.getInstance().registerImageLoader(
PowerImageNativeAssetLoader(this.applicationContext), "nativeAsset"
)
PowerImageLoader.getInstance().registerImageLoader(
PowerImageFlutterAssetLoader(this.applicationContext), "asset"
)
PowerImageLoader.getInstance().registerImageLoader(
PowerImageFileLoader(this.applicationContext), "file"
)
loader 需要遵循 PowerImageLoaderProtocol 协议：
public interface PowerImageLoaderProtocol {
void handleRequest(PowerImageRequestConfig request, PowerImageResult result);
}
Network image loader example:
public class PowerImageNetworkLoader implements PowerImageLoaderProtocol {
private Context context;
public PowerImageNetworkLoader(Context context) {
this.context = context;
}
@Override
public void handleRequest(PowerImageRequestConfig request, PowerImageResponse response) {
Glide.with(context).asDrawable().load(request.srcString()).listener(new RequestListener<Drawable>() {
@Override
public boolean onLoadFailed(@Nullable GlideException e, Object model, Target<Drawable> target, boolean isFirstResource) {
response.onResult(PowerImageResult.genFailRet("Native加载失败: " + (e != null ? e.getMessage() : "null")));
return true;
}
@Override
public boolean onResourceReady(Drawable resource, Object model, Target<Drawable> target, DataSource dataSource, boolean isFirstResource) {
if (resource instanceof GifDrawable) {
response.onResult(PowerImageResult.genSucRet(new GlideMultiFrameImage((GifDrawable) resource, false)));
} else {
if (resource instanceof BitmapDrawable) {
response.onResult(PowerImageResult.genSucRet(new FlutterSingleFrameImage((BitmapDrawable) resource)));
} else {
response.onResult(PowerImageResult.genFailRet("Native加载失败: resource : " + String.valueOf(resource)));
}
}
return true;
}
}).submit(request.width <= 0 ? Target.SIZE_ORIGINAL : request.width,
request.height <= 0 ? Target.SIZE_ORIGINAL : request.height);
}
}
class PowerImageNetworkLoader(private val context: Context) : PowerImageLoaderProtocol {
override fun handleRequest(request: PowerImageRequestConfig, response: PowerImageResponse) {
Glide.with(context).asDrawable().load(request.srcString())
.listener(object : RequestListener<Drawable> {
override fun onLoadFailed(
e: GlideException?,
model: Any,
target: Target<Drawable>,
isFirstResource: Boolean
): Boolean {
response.onResult(PowerImageResult.genFailRet("Native加载失败: " + if (e != null) e.message else "null"))
return true
}
override fun onResourceReady(
resource: Drawable,
model: Any,
target: Target<Drawable>,
dataSource: DataSource,
isFirstResource: Boolean
): Boolean {
if (resource is GifDrawable) {
response.onResult(
PowerImageResult.genSucRet(
GlideMultiFrameImage(
resource as GifDrawable,
false
)
)
)
} else {
if (resource is BitmapDrawable) {
response.onResult(
PowerImageResult.genSucRet(
FlutterSingleFrameImage(
resource as BitmapDrawable
)
)
)
} else {
response.onResult(PowerImageResult.genFailRet("Native加载失败: resource : $resource"))
}
}
return true
}
}).submit(
if (request.width <= 0) Target.SIZE_ORIGINAL else request.width,
if (request.height <= 0) Target.SIZE_ORIGINAL else request.height
)
}
}
native asset loader example:
public class PowerImageNativeAssetLoader implements PowerImageLoaderProtocol {
private Context context;
public PowerImageNativeAssetLoader(Context context) {
this.context = context;
}
@Override
public void handleRequest(PowerImageRequestConfig request, PowerImageResponse response) {
Resources resources = context.getResources();
int resourceId = 0;
try {
resourceId = resources.getIdentifier(request.srcString(),
"drawable", context.getPackageName());
} catch (Resources.NotFoundException e) {
// 资源未找到
e.printStackTrace();
}
if (resourceId == 0) {
response.onResult(PowerImageResult.genFailRet("资源未找到"));
return;
}
Glide.with(context).asBitmap().load(resourceId).listener(new RequestListener<Bitmap>() {
@Override
public boolean onLoadFailed(@Nullable GlideException e, Object model, Target<Bitmap> target, boolean isFirstResource) {
response.onResult(PowerImageResult.genFailRet("Native加载失败: " + (e != null ? e.getMessage() : "null")));
return true;
}
@Override
public boolean onResourceReady(Bitmap resource, Object model, Target<Bitmap> target, DataSource dataSource, boolean isFirstResource) {
response.onResult(PowerImageResult.genSucRet(resource));
return true;
}
}).submit(request.width <= 0 ? Target.SIZE_ORIGINAL : request.width,
request.height <= 0 ? Target.SIZE_ORIGINAL : request.height);
}
}
class PowerImageNativeAssetLoader(private val context: Context) : PowerImageLoaderProtocol {
override fun handleRequest(request: PowerImageRequestConfig, response: PowerImageResponse) {
val resources = context.resources
var resourceId = 0
try {
resourceId = resources.getIdentifier(
request.srcString(),
"drawable", context.packageName
)
} catch (e: Resources.NotFoundException) {
// 资源未找到
e.printStackTrace()
}
if (resourceId == 0) {
response.onResult(PowerImageResult.genFailRet("资源未找到"))
return
}
Glide.with(context).asBitmap().load(resourceId).listener(object : RequestListener<Bitmap?> {
override fun onLoadFailed(
e: GlideException?,
model: Any,
target: Target<Bitmap?>,
isFirstResource: Boolean
): Boolean {
response.onResult(PowerImageResult.genFailRet("Native加载失败: " + if (e != null) e.message else "null"))
return true
}
override fun onResourceReady(
resource: Bitmap?,
model: Any,
target: Target<Bitmap?>,
dataSource: DataSource,
isFirstResource: Boolean
): Boolean {
response.onResult(PowerImageResult.genSucRet(resource))
return true
}
}).submit(
if (request.width <= 0) Target.SIZE_ORIGINAL else request.width,
if (request.height <= 0) Target.SIZE_ORIGINAL else request.height
)
}
}
flutter asset loader example:
public class PowerImageFlutterAssetLoader implements PowerImageLoaderProtocol {
private Context context;
public PowerImageFlutterAssetLoader(Context context) {
this.context = context;
}
@Override
public void handleRequest(PowerImageRequestConfig request, PowerImageResponse response) {
String name = request.srcString();
if (name == null || name.length() <= 0) {
response.onResult(PowerImageResult.genFailRet("src 为空"));
return;
}
String assetPackage = "";
if (request.src != null) {
assetPackage = (String) request.src.get("package");
}
String path;
if (assetPackage != null && assetPackage.length() > 0) {
path = FlutterMain.getLookupKeyForAsset(name, assetPackage);
} else {
path = FlutterMain.getLookupKeyForAsset(name);
}
if (path == null || path.length() <= 0) {
response.onResult(PowerImageResult.genFailRet("path 为空"));
return;
}
Uri asset = Uri.parse("file:///android_asset/" + path);
Glide.with(context).asBitmap().load(asset).listener(new RequestListener<Bitmap>() {
@Override
public boolean onLoadFailed(@Nullable GlideException e, Object model, Target<Bitmap> target, boolean isFirstResource) {
response.onResult(PowerImageResult.genFailRet("Native加载失败: " + (e != null ? e.getMessage() : "null")));
return true;
}
@Override
public boolean onResourceReady(Bitmap resource, Object model, Target<Bitmap> target, DataSource dataSource, boolean isFirstResource) {
response.onResult(PowerImageResult.genSucRet(resource));
return true;
}
}).submit(request.width <= 0 ? Target.SIZE_ORIGINAL : request.width,
request.height <= 0 ? Target.SIZE_ORIGINAL : request.height);
}
}
file loader example:
public class PowerImageFileLoader implements PowerImageLoaderProtocol {
private final Context context;
public PowerImageFileLoader(Context context) {
this.context = context;
}
@Override
public void handleRequest(PowerImageRequestConfig request, PowerImageResponse response) {
String name = request.srcString();
if (name == null || name.length() <= 0) {
response.onResult(PowerImageResult.genFailRet("src 为空"));
return;
}
Uri asset = Uri.parse("file://" + name);
Glide.with(context).asBitmap().load(asset).listener(new RequestListener<Bitmap>() {
@Override
public boolean onLoadFailed(@Nullable GlideException e, Object model, Target<Bitmap> target, boolean isFirstResource) {
response.onResult(PowerImageResult.genFailRet("Native加载失败: " + (e != null ? e.getMessage() : "null")));
return true;
}
@Override
public boolean onResourceReady(Bitmap resource, Object model, Target<Bitmap> target, DataSource dataSource, boolean isFirstResource) {
response.onResult(PowerImageResult.genSucRet(resource));
return true;
}
}).submit(request.width <= 0 ? Target.SIZE_ORIGINAL : request.width,
request.height <= 0 ? Target.SIZE_ORIGINAL : request.height);
}
}
class PowerImageFileLoader(private val context: Context) : PowerImageLoaderProtocol {
override fun handleRequest(request: PowerImageRequestConfig, response: PowerImageResponse) {
val name = request.srcString()
if (name == null || name.length <= 0) {
response.onResult(PowerImageResult.genFailRet("src 为空"))
return
}
val asset = Uri.parse("file://$name")
Glide.with(context).asBitmap().load(asset).listener(object : RequestListener<Bitmap?> {
override fun onLoadFailed(
e: GlideException?,
model: Any,
target: Target<Bitmap?>,
isFirstResource: Boolean
): Boolean {
response.onResult(PowerImageResult.genFailRet("Native加载失败: " + if (e != null) e.message else "null"))
return true
}
override fun onResourceReady(
resource: Bitmap?,
model: Any,
target: Target<Bitmap?>,
dataSource: DataSource,
isFirstResource: Boolean
): Boolean {
response.onResult(PowerImageResult.genSucRet(resource))
return true
}
}).submit(
if (request.width <= 0) Target.SIZE_ORIGINAL else request.width,
if (request.height <= 0) Target.SIZE_ORIGINAL else request.height
)
}
}
network image:
PowerImage.network(
String src, {
Key? key,
String? renderingType,
double? imageWidth,
double? imageHeight,
this.width,
this.height,
this.frameBuilder,
this.errorBuilder,
this.fit = BoxFit.cover,
this.alignment = Alignment.center,
this.semanticLabel,
this.excludeFromSemantics = false,
})
nativeAsset:
PowerImage.nativeAsset(
String src, {
Key? key,
String? renderingType,
double? imageWidth,
double? imageHeight,
this.width,
this.height,
this.frameBuilder,
this.errorBuilder,
this.fit = BoxFit.cover,
this.alignment = Alignment.center,
this.semanticLabel,
this.excludeFromSemantics = false,
})
Flutter asset:
PowerImage.asset(
String src, {
Key? key,
String? renderingType,
double? imageWidth,
double? imageHeight,
String? package,
this.width,
this.height,
this.frameBuilder,
this.errorBuilder,
this.fit = BoxFit.cover,
this.alignment = Alignment.center,
this.semanticLabel,
this.excludeFromSemantics = false,
})
File:
PowerImage.file(String src,
{Key key,
this.width,
this.height,
this.frameBuilder,
this.errorBuilder,
this.fit = BoxFit.cover,
this.alignment = Alignment.center,
String renderingType,
double imageWidth,
double imageHeight})
自定义来源图片:
1.自定义 imageType，比如 “album”。
2.自定义 src（PowerImageRequestOptionsSrc），里面放需要传递给native的自定义参数。
3.Native侧自定义Loader，接收Flutter侧传递的参数，然后返回一个Bitmap或UIImage，并注册该Loader。
4.Flutter侧就可以展示自定义的图片了。
/// 自定义 imageType\src
/// 效果：将src encode 后，完成地传递给 native 对应 imageType 注册的 loader
/// 使用场景：
/// 例如，自定义加载相册照片，通过自定义 imageType 为 "album"，
/// native 侧注册 "album" 类型的 loader 自定义图片的加载。
PowerImage.type(
String imageType, {
required PowerImageRequestOptionsSrc src,
Key? key,
String? renderingType,
double? imageWidth,
double? imageHeight,
this.width,
this.height,
this.frameBuilder,
this.errorBuilder,
this.fit = BoxFit.cover,
this.alignment = Alignment.center,
this.semanticLabel,
this.excludeFromSemantics = false,
})
.options
/// 更加灵活的方式，通过自定义options来展示图片
///
/// PowerImageRequestOptions({
/// @required this.src, //资源
/// @required this.imageType, //资源类型，如网络图，本地图或者自定义等
/// this.renderingType, //渲染方式，默认全局
/// this.imageWidth, //图片的渲染的宽度
/// this.imageHeight, //图片渲染的高度
/// });
///
/// PowerExternalImageProvider（FFI[bitmap]方案）
/// PowerTextureImageProvider（texture方案）
///
/// 使用场景：
/// 例如，自定义加载相册照片，通过自定义 imageType 为 "album"，
/// native 侧注册 "album" 类型的 loader 自定义图片的加载。
///
PowerImage.options(
PowerImageRequestOptions options, {
Key? key,
this.width,
this.height,
this.frameBuilder,
this.errorBuilder,
this.fit = BoxFit.cover,
this.alignment = Alignment.center,
this.semanticLabel,
this.excludeFromSemantics = false,
})
PowerImageLoader.getInstance().registerImageLoader(
new PowerImageAlbumLoader(application.getApplicationContext()), "album");
public class PowerImageAlbumLoader implements PowerImageLoaderProtocol {
private final Context context;
public PowerImageAlbumLoader(Context context) {
this.context = context;
}
@Override
public void handleRequest(PowerImageRequestConfig request, final PowerImageResponse response) {
Map<String, Object> src = request.src;
if (src == null || src.get(Const.Argument.ASSET_ID) == null || src.get(Const.Argument.ASSET_TYPE) == null) {
PowerImageResult result = PowerImageResult.genFailRet("asset id or assetType == null");
response.onResult(result);
return;
}
AssetQuality quality = AssetQuality.values()[(int) src.get(Const.Argument.QUALITY)];
boolean highQuality = quality == AssetQuality.fullScreen;
final LocalMedia media = new LocalMedia();
media.fromMap(src);
final ThumbnailLoader thumbnailLoader = new ThumbnailLoader(context);
thumbnailLoader.load(media, highQuality, new ThumbnailLoader.ThumbnailLoadListener() {
@Override
public void onThumbnailLoaded(final Bitmap bitmap) {
PowerImageResult result;
if (bitmap == null) {
result = PowerImageResult.genFailRet("bitmap == null");
} else {
result = PowerImageResult.genSucRet(bitmap);
}
response.onResult(result);
}
});
}
}
[[PowerImageLoader sharedInstance] registerImageLoader:[AlbumAssetsImageLoader new] forType:@"album"];
- (void)handleRequest:(PowerImageRequestConfig *)requestConfig completed:(PowerImageLoaderCompletionBlock)completedBlock {
NSString *assetId = requestConfig.src[@"assetId"];
NSNumber *imageWidth = requestConfig.src[@"imageWidth"];
NSNumber *imageHeight = requestConfig.src[@"imageHeight"];
if (assetId) {
if (imageWidth && imageHeight) {
[[MPAssetManager sharedInstance] getImageWithAssetId:assetId
imageSize:CGSizeMake(imageWidth.doubleValue, imageHeight.doubleValue)
successHandler:^(UIImage *image) {
completedBlock([PowerImageResult successWithImage:image]);
} failureHandler:^(NSError *error) {
completedBlock([PowerImageResult failWithMessage:error.localizedDescription]);
}];
} else {
[[MPAssetManager sharedInstance] getThumbnail:assetId
successHandler:^(UIImage *image) {
completedBlock([PowerImageResult successWithImage:image]);
} failureHandler:^(NSError *error) {
completedBlock([PowerImageResult failWithMessage:error.localizedDescription]);
}];
}
} else {
completedBlock([PowerImageResult failWithMessage:@"assetId is nil"]);
}
}
Network
return PowerImage.network(
'https://flutter.github.io/assets-for-api-docs/assets/widgets/owl.jpg',
width: 100,
height: 100,
);
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