com.bumptech.glide.load.resource.file.FileToStreamDecoder#com.bumptech.glide.signature.StringSignature源码实例Demo

@Override protected void load(final Context context) throws Exception {
	String profileUrl = "...";
	long lastProfileCache = context.getSharedPreferences("profile", 0)
	                               .getLong("lastCacheTime", System.currentTimeMillis());
	Glide // display a fresh version
	      .with(context)
	      .load(profileUrl)
	      .thumbnail(Glide // display a cached version
	                       .with(context)
	                       .using(new NetworkDisablingLoader<>()) // only if exists in disk cache
	                       .load(profileUrl)
	                       .signature(new StringSignature(String.valueOf(lastProfileCache)))
	                       .diskCacheStrategy(SOURCE)
	      )
	      .diskCacheStrategy(NONE) // downloaded right now
	      .into(imageView)
	;
}
 

private void cache(String url, final Bitmap bitmap) {
	Key key = new StringSignature(url);
	// the key here is that Engine uses fetcher.getId() for constructing OriginalKey from EngineKey
	// see Engine.load and also signature can be ignored because it is an EmptySignature instance for most
	App.getInstance().getDiskCache().put(key, new Writer() {
		@TargetApi(VERSION_CODES.KITKAT) // for try-with-resources
		@Override public boolean write(File file) {
			try (OutputStream out = new FileOutputStream(file)) {
				// mimic default behavior you can also use Bitmap.compress
				BitmapPool pool = Glide.get(getContext()).getBitmapPool();
				BitmapResource resource = BitmapResource.obtain(bitmap, pool);
				new BitmapEncoder().encode(resource, out);
				return true;
			} catch (IOException e) {
				e.printStackTrace();
				return false;
			}
		}
	});
}
 

@SuppressWarnings("unchecked")
@Override protected void load(Context context) {
	GenericRequestBuilder<Bitmap, Bitmap, Bitmap, Bitmap> glide = Glide
			.with(context)
			.using(new PassthroughModelLoader<Bitmap, Bitmap>(), Bitmap.class)
			.from(Bitmap.class)
			.as(Bitmap.class)
			.decoder(new BitmapBitmapResourceDecoder(context))
			.cacheDecoder(new FileToStreamDecoder<Bitmap>(new StreamBitmapDecoder(context)))
			.encoder(new BitmapEncoder())
			// or .diskCacheStrategy(DiskCacheStrategy.NONE) instead of last 2
			;

	// simulate a bitmap input
	Drawable drawable = ContextCompat.getDrawable(context, android.R.drawable.sym_def_app_icon);
	Bitmap bitmap = Bitmap.createBitmap(
			drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Config.ARGB_8888);
	Canvas canvas = new Canvas(bitmap);
	drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
	drawable.draw(canvas);

	glide
			.clone()
			.load(bitmap)
			.signature(new StringSignature("android.R.drawable.sym_def_app_icon")) // required for caching
			.diskCacheStrategy(DiskCacheStrategy.NONE) // but can't really cache it, see #122 comments
			.transform(new CenterCrop(context))
			.into(imageView)
	;
}
 

private void updateProfileCache(final Context context, String profileUrl) {
	final long lastProfileCache = System.currentTimeMillis();
	Glide
			.with(context)
			.load(profileUrl)
			.signature(new StringSignature(String.valueOf(lastProfileCache)))
			.diskCacheStrategy(SOURCE)
			.listener(new SaveLastProfileCacheTime(context, lastProfileCache))
			.preload()
	;
}
 

@Override protected void load(final Context context) throws Exception {
	final ImageView imageView = this.imageView;
	toto = toto + 1;
	Glide
			.with(context.getApplicationContext())
			.load("http://lorempixel.com/400/200/sports")
			.signature(new StringSignature(Integer.toString(toto)))
			.centerCrop()
			.listener(new LoggingListener<String, GlideDrawable>())
			.into(imageView)
	;
}
 

@Override protected void load1(Context context, ImageView imageView) throws Exception {
	Glide
			.with(this)
			// default timeout is 2.5 seconds (com.bumptech.glide.load.data.HttpUrlFetcher)
			.load("https://httpbin.org/delay/12") // force a timeout: 2.5 < 12
			.signature(new StringSignature("load1")) // distinguish from other load to make sure loader is picked up
			.placeholder(R.drawable.glide_placeholder)
			.error(R.drawable.glide_error)
			.listener(new LoggingListener<String, GlideDrawable>("load1"))
			.into(new LoggingTarget<>("load1", Log.VERBOSE, new GlideDrawableImageViewTarget(imageView)))
	;
}
 

@Override protected void load2(Context context, ImageView imageView) throws Exception {
	Glide
			.with(this)
			.using(new StreamModelLoaderWrapper<>(new OkHttpUrlLoader(longTimeoutClient)))
			.load(new GlideUrl("https://httpbin.org/delay/12")) // timeout increased: 15 > 10, so it'll pass
			.signature(new StringSignature("load2")) // distinguish from other load to make sure loader is picked up
			.placeholder(R.drawable.glide_placeholder)
			// since the test URL returns a JSON stream, the load will fail,
			// let's still add an error to see that the load fails slower than the other,
			// meaning the image was actually tried to be decoded
			.error(R.drawable.glide_error)
			.listener(new LoggingListener<GlideUrl, GlideDrawable>("load2"))
			.into(new LoggingTarget<>("load2", Log.VERBOSE, new GlideDrawableImageViewTarget(imageView)))
	;
}
 

public StringSignature getArtistSignature(String artistName) {
    return new StringSignature(String.valueOf(getArtistSignatureRaw(artistName)));
}
 

public StringSignature getArtistSignature(String artistName) {
    return new StringSignature(String.valueOf(getArtistSignatureRaw(artistName)));
}
 

public StringSignature getArtistSignature(String artistName) {
    return new StringSignature(String.valueOf(getArtistSignatureRaw(artistName)));
}
 

@Override
public void onBindViewHolder(final ViewHolder viewHolder, final int position) {
    viewHolder.itemView.setClickable(true);
    viewHolder.itemView.setActivated(mSelectedItems.get(position, false));

    entry = mItems.get(position);

    date = entry.creationDate;
    description = entry.text;
    tags = entry.tags;
    starred = entry.starred;

    emptyCal.set(Calendar.DAY_OF_MONTH, date.get(Calendar.DAY_OF_MONTH));
    emptyCal.set(Calendar.MONTH, date.get(Calendar.MONTH));
    emptyCal.set(Calendar.YEAR, date.get(Calendar.YEAR));

    viewHolder.title.setText(entry.title);

    if (description != null)
        viewHolder.description.setText(description.substring(0, Math.min(description.length(), 400)));

    viewHolder.timeOfDay.setText(timeFormat.format(date.getTime()));

    if (entry.photos.isEmpty()) {

        viewHolder.thumbnail.setVisibility(View.GONE);
        viewHolder.dayOfMonth.setVisibility(View.VISIBLE);

        viewHolder.dayOfMonth.setText(String.valueOf(entry.creationDate.get(Calendar.DAY_OF_MONTH)));

        if (!colorDates.contains(emptyCal.getTimeInMillis())) {

            int index = mBackgroundCount++ % mCircleBackgrounds.length;

            if (Build.VERSION.SDK_INT >= 16)
                viewHolder.dayOfMonth.setBackground(mCircleBackgrounds[index]);
            else
                viewHolder.dayOfMonth.setBackgroundDrawable(mCircleBackgrounds[index]);

            viewHolder.dayOfMonth.setTag(index);

            colorMap.put(emptyCal.getTimeInMillis(), index);
            colorDates.add(emptyCal.getTimeInMillis());
        } else {

            if (Build.VERSION.SDK_INT >= 16)
                viewHolder.dayOfMonth.setBackground(mCircleBackgrounds[colorMap.get(emptyCal.getTimeInMillis())]);
            else
                viewHolder.dayOfMonth.setBackgroundDrawable(mCircleBackgrounds[colorMap.get(emptyCal.getTimeInMillis())]);

        }
    } else {
        viewHolder.dayOfMonth.setVisibility(View.GONE);
        viewHolder.thumbnail.setVisibility(View.VISIBLE);

        String path = entry.photos.get(0).path;
        File image = new File(path);
        Glide.with(GlobalApplication.getAppContext())
                .load(path)
                .transform(mRoundCornerTransformation)
                .placeholder(R.color.transparent)
                .signature(new StringSignature(String.valueOf(image.lastModified())))
                .into(viewHolder.thumbnail);
    }

    if (starred) {
        viewHolder.bookmark.setVisibility(View.VISIBLE);
    } else {
        viewHolder.bookmark.setVisibility(View.INVISIBLE);
    }

}
 

public StringSignature getArtistSignature(String artistName) {
    return new StringSignature(String.valueOf(getArtistSignatureRaw(artistName)));
}
 

/**
 * Returns a request builder that uses {@link StreamByteArrayLoader} to load
 * images from byte arrays.
 *
 * <p>
 *     Note - by default loads for bytes are not cached in either the memory or the disk cache.
 * </p>
 *
 * @see #from(Class)
 * @see #load(byte[])
 */
public DrawableTypeRequest<byte[]> fromBytes() {
    return (DrawableTypeRequest<byte[]>) loadGeneric(byte[].class)
            .signature(new StringSignature(UUID.randomUUID().toString()))
            .diskCacheStrategy(DiskCacheStrategy.NONE)
            .skipMemoryCache(true /*skipMemoryCache*/);
}
 

/**
 * Returns a request builder that uses a {@link StreamByteArrayLoader} to load an image from the given byte array.
 *
 *
 * <p>
 *     Note - by default loads for bytes are not cached in either the memory or the disk cache.
 * </p>
 *
 * @see #load(byte[])
 *
 * @deprecated Use {@link #load(byte[])} along with
 * {@link GenericRequestBuilder#signature(Key)} instead. Scheduled to be
 * removed in Glide 4.0.
 * @param model The data to load.
 * @param id A unique id that identifies the image represented by the model suitable for use as a cache key
 *           (url, filepath etc). If there is no suitable id, use {@link #load(byte[])} instead.
 */
@Deprecated
public DrawableTypeRequest<byte[]> load(byte[] model, final String id) {
    return (DrawableTypeRequest<byte[]>) load(model).signature(new StringSignature(id));
}