Glide: charge drawable mais pas d'échelle

Re: Gregs commentaire:
Je lui ai donné un autre coup (avec presque un an d'XP supplémentaire) et est venu avec cette:

<ImageView android:scaleType="center" ... />

similaire à mon autre solution et l'animation suivante wrapper:

...
.fitCenter()
.animate(new PaddingAnimationFactory<>(new DrawableCrossFadeFactory<GlideDrawable>(2000)))
.into(imageView)
;
class PaddingAnimationFactory<T extends Drawable> implements GlideAnimationFactory<T> {
private final DrawableCrossFadeFactory<T> realFactory;
@Override public GlideAnimation<T> build(boolean isFromMemoryCache, boolean isFirstResource) {
return new PaddingAnimation<>(realFactory.build(isFromMemoryCache, isFirstResource));
}
}
class PaddingAnimation<T extends Drawable> implements GlideAnimation<T> {
private final GlideAnimation<? super T> realAnimation;
@Override public boolean animate(T current, final ViewAdapter adapter) {
int width = current.getIntrinsicWidth();
int height = current.getIntrinsicHeight();
return realAnimation.animate(current, new PaddingViewAdapter(adapter, width, height));
}
}
class PaddingViewAdapter implements ViewAdapter {
@Override public Drawable getCurrentDrawable() {
Drawable drawable = realAdapter.getCurrentDrawable();
if (drawable != null) {
int padX = Math.max(0, targetWidth - drawable.getIntrinsicWidth()) / 2;
int padY = Math.max(0, targetHeight - drawable.getIntrinsicHeight()) / 2;
if (padX != 0 || padY != 0) {
drawable = new InsetDrawable(drawable, padX, padY, padX, padY);
}
}
return drawable;
}
@Override public void setDrawable(Drawable drawable) {
if (VERSION.SDK_INT >= VERSION_CODES.M && drawable instanceof TransitionDrawable) {
//For some reason padding is taken into account differently on M than before in LayerDrawable
//PaddingMode was introduced in 21 and gravity in 23, I think NO_GRAVITY default may play
//a role in this, but didn't have time to dig deeper than this.
((TransitionDrawable)drawable).setPaddingMode(TransitionDrawable.PADDING_MODE_STACK);
}
realAdapter.setDrawable(drawable);
}
}

Trivial parties de la implémentations sont omis, chaque constructeur de la classe initialise les champs à partir des arguments. Code complet disponible sur GitHub dans TWiStErRob/glide-soutien.

---

Si vous êtes coincé sur une ancienne version de Glisse (avant 3.8.0), le même effet peut être obtenu par:

.fitCenter()
.placeholder(R.drawable.glide_placeholder)
.crossFade(2000)
.into(new GlideDrawableImageViewTarget(imageView) {
@Override public void onResourceReady(GlideDrawable resource,
GlideAnimation<? super GlideDrawable> animation) {
super.onResourceReady(resource, new PaddingAnimation<>(animation));
}
})

Notez comment les deux solutions requièrent le même nombre de classes, mais le post-3.8.0 solution a une meilleure séparation des préoccupations et il peut être mis en cache dans une variable afin de prévenir les allocations.

Je faire comme mentionné ci-dessous:

L'idée est de définir le type d'échelle tel que prescrit par le titulaire de place initialement & ajoutez un écouteur pour changer le type d'échelle de nouveau tel que requis par l'image téléchargée après le téléchargement de l'image.

//ivBuilderLogo = Target ImageView
//Set the scale type to as required by your place holder
//ScaleType.CENTER_INSIDE will maintain aspect ration and fit the placeholder inside the image view
holder.ivBuilderLogo.setScaleType(ImageView.ScaleType.CENTER_INSIDE); 
//AnimationDrawable is required when you are using transition drawables
//You can directly send resource id to glide if your placeholder is static
//However if you are using GIFs, it is better to create a transition drawable in xml 
//& use it as shown in this example
AnimationDrawable animationDrawable;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
animationDrawable=(AnimationDrawable)context.getDrawable(R.drawable.anim_image_placeholder);
else
animationDrawable=(AnimationDrawable)context.getResources().getDrawable(R.drawable.anim_image_placeholder);
animationDrawable.start();
Glide.with(context).load(logo_url)
.placeholder(animationDrawable)
.listener(new RequestListener<String, GlideDrawable>() {
@Override
public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource)
{
return false;
}
//This is invoked when your image is downloaded and is ready 
//to be loaded to the image view
@Override
public boolean onResourceReady(GlideDrawable resource, String model, Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource)
{   
//This is used to remove the placeholder image from your ImageView 
//and load the downloaded image with desired scale-type(FIT_XY in this case)
//Changing the scale type from 'CENTER_INSIDE' to 'FIT_XY' 
//will stretch the placeholder for a (very) short duration,
//till the downloaded image is loaded
//setImageResource(0) removes the placeholder from the image-view 
//before setting the scale type to FIT_XY and ensures that the UX 
//is not spoiled, even for a (very) short duration
holder.ivBuilderLogo.setImageResource(0);
holder.ivBuilderLogo.setScaleType(ImageView.ScaleType.FIT_XY);
return false;
}
})
.into( holder.ivBuilderLogo);

Ma transition drawable (R. drawable.anim_image_placeholder) :

(pas nécessaire si vous utilisez une image statique)

<?xml version="1.0" encoding="utf-8"?>
<animation-list
xmlns:android="http://schemas.android.com/apk/res/android"
android:oneshot="false">
<item android:drawable="@drawable/loading_frame1" android:duration="100" />
<!--<item android:drawable="@drawable/loading_frame2" android:duration="100" />-->
<item android:drawable="@drawable/loading_frame3" android:duration="100" />
<!--<item android:drawable="@drawable/loading_frame4" android:duration="100" />-->
<item android:drawable="@drawable/loading_frame5" android:duration="100" />
<!--<item android:drawable="@drawable/loading_frame6" android:duration="100" />-->
<item android:drawable="@drawable/loading_frame7" android:duration="100" />
<!--<item android:drawable="@drawable/loading_frame8" android:duration="100" />-->
<item android:drawable="@drawable/loading_frame9" android:duration="100" />
<!--<item android:drawable="@drawable/loading_frame10" android:duration="100" />-->
</animation-list>