前言
上一篇中，我們閱讀了glide的with方法的相關程式碼，這一篇，我們來看看load方法。
首先，load方法有以下幾個過載方法：
public RequestBuilder<Drawable> load(@Nullable Bitmap bitmap) {
return asDrawable().load(bitmap);
}
public RequestBuilder<Drawable> load(@Nullable Drawable drawable) {
return asDrawable().load(drawable);
}
public RequestBuilder<Drawable> load(@Nullable String string) {
return asDrawable().load(string);
}
public RequestBuilder<Drawable> load(@Nullable Uri uri) {
return asDrawable().load(uri);
}
public RequestBuilder<Drawable> load(@Nullable File file) {
return asDrawable().load(file);
}
public RequestBuilder<Drawable> load(@RawRes @DrawableRes @Nullable Integer resourceId) {
return asDrawable().load(resourceId);
}
public RequestBuilder<Drawable> load(@Nullable byte[] model) {
return asDrawable().load(model);
}
public RequestBuilder<Drawable> load(@Nullable URL url) {
return asDrawable().load(url);
}
public RequestBuilder<Drawable> load(@Nullable Object model) {
return asDrawable().load(model);
}
複製程式碼我們發現，呼叫的都是 asDrawable().load(model)方法，再來看看asDrawable方法
public RequestBuilder<Drawable> asDrawable() {
return as(Drawable.class);
}
public <ResourceType> RequestBuilder<ResourceType> as(
@NonNull Class<ResourceType> resourceClass) {
return new RequestBuilder<>(glide, this, resourceClass, context);
}
複製程式碼我們可以看到，這裡建立了一個RequestBuilder，並且指定了ResourceType為Drawable，同理的還有asFile、asGif、asBitmap方法
public RequestBuilder<File> asFile() {
return as(File.class).apply(skipMemoryCacheOf(true));
}
public RequestBuilder<GifDrawable> asGif() {
return as(GifDrawable.class).apply(DECODE_TYPE_GIF);
}
public RequestBuilder<Bitmap> asBitmap() {
return as(Bitmap.class).apply(DECODE_TYPE_BITMAP);
}
複製程式碼接著，我們再看RequestBuilder的load方法
public RequestBuilder<TranscodeType> load(@Nullable String string) {
return loadGeneric(string);
}
public RequestBuilder<TranscodeType> load(@Nullable Drawable drawable) {
return loadGeneric(drawable)
.apply(diskCacheStrategyOf(DiskCacheStrategy.NONE));
}
public RequestBuilder<TranscodeType> load(@Nullable Bitmap bitmap) {
return loadGeneric(bitmap)
.apply(diskCacheStrategyOf(DiskCacheStrategy.NONE));
}
public RequestBuilder<TranscodeType> load(@Nullable Uri uri) {
return loadGeneric(uri);
}
public RequestBuilder<TranscodeType> load(@Nullable File file) {
return loadGeneric(file);
}
public RequestBuilder<TranscodeType> load(@RawRes @DrawableRes @Nullable Integer resourceId) {
return loadGeneric(resourceId).apply(signatureOf(ApplicationVersionSignature.obtain(context)));
}
public RequestBuilder<TranscodeType> load(@Nullable URL url) {
return loadGeneric(url);
}
public RequestBuilder<TranscodeType> load(@Nullable byte[] model) {
RequestBuilder<TranscodeType> result = loadGeneric(model);
if (!result.requestOptions.isDiskCacheStrategySet()) {
result = result.apply(diskCacheStrategyOf(DiskCacheStrategy.NONE));
}
if (!result.requestOptions.isSkipMemoryCacheSet()) {
result = result.apply(skipMemoryCacheOf(true /*skipMemoryCache*/));
}
return result;
}
複製程式碼可以看到，最後呼叫的都是loadGeneric方法，來看看loadGeneric的原始碼
private RequestBuilder<TranscodeType> loadGeneric(@Nullable Object model) {
this.model = model;
isModelSet = true;
return this;
}
複製程式碼。。。。。。就只是做了個變數的賦值，同樣的還有其他一些常用的方法：apply、transition、listener、addListener、error等方法
public RequestBuilder<TranscodeType> apply(@NonNull RequestOptions requestOptions) {
Preconditions.checkNotNull(requestOptions);
this.requestOptions = getMutableOptions().apply(requestOptions);
return this;
}
public RequestBuilder<TranscodeType> transition(
@NonNull TransitionOptions<?, ? super TranscodeType> transitionOptions) {
this.transitionOptions = Preconditions.checkNotNull(transitionOptions);
isDefaultTransitionOptionsSet = false;
return this;
}
public RequestBuilder<TranscodeType> listener(
@Nullable RequestListener<TranscodeType> requestListener) {
this.requestListeners = null;
return addListener(requestListener);
}
public RequestBuilder<TranscodeType> addListener(
@Nullable RequestListener<TranscodeType> requestListener) {
if (requestListener != null) {
if (this.requestListeners == null) {
this.requestListeners = new ArrayList<>();
}
this.requestListeners.add(requestListener);
}
return this;
}
public RequestBuilder<TranscodeType> error(@Nullable RequestBuilder<TranscodeType> errorBuilder) {
this.errorBuilder = errorBuilder;
return this;
}
複製程式碼