Android加载图片（二）Glide简介及简单用法

An image loading and caching library for Android focused on smooth scrolling https://bumptech.github.io/glide/

翻译：一个Android的图片加载和缓存的库，致力于平滑移动。

Glide is a fast and efficient open source media management and image loading framework for Android that wraps media decoding, memory and disk caching, and resource pooling into a simple and easy to use interface.

翻译：Glide是一个快速而有效率的关于开源媒体管理和图片加载的库，

Glide supports fetching, decoding, and displaying video stills, images, and animated GIFs. Glide includes a flexible API that allows developers to plug in to almost any network stack. By default Glide uses a custom HttpUrlConnection based stack, but also includes utility libraries plug in to Google's Volley project or Square's OkHttp library instead.

Glide's primary focus is on making scrolling any kind of a list of images as smooth and fast as possible, but Glide is also effective for almost any case where you need to fetch, resize, and display a remote image.

Download

For detailed instructions and requirements, see Glide's download and setup docs page.

You can download a jar from GitHub's releases page.

Or use Gradle:

repositories {
  mavenCentral()
  google()
}

dependencies {
  implementation 'com.github.bumptech.glide:glide:4.9.0'
  annotationProcessor 'com.github.bumptech.glide:compiler:4.9.0'
}

Or Maven:

<dependency>
  <groupId>com.github.bumptech.glide</groupId>
  <artifactId>glide</artifactId>
  <version>4.9.0</version>
</dependency>
<dependency>
  <groupId>com.github.bumptech.glide</groupId>
  <artifactId>compiler</artifactId>
  <version>4.9.0</version>
  <optional>true</optional>
</dependency>

For info on using the bleeding edge, see the Snapshots docs page.

ProGuard

Depending on your ProGuard (DexGuard) config and usage, you may need to include the following lines in your proguard.cfg (see the Download and Setup docs page for more details):

-keep public class * implements com.bumptech.glide.module.GlideModule
-keep public class * extends com.bumptech.glide.module.AppGlideModule
-keep public enum com.bumptech.glide.load.ImageHeaderParser$** {
  **[] $VALUES;
  public *;
}

# for DexGuard only
-keepresourcexmlelements manifest/application/meta-data@value=GlideModule

How do I use Glide?

Check out the documentation for pages on a variety of topics, and see the javadocs.

For Glide v3, see the wiki.

Simple use cases will look something like this:

/ For a simple view:
@Override public void onCreate(Bundle savedInstanceState) {
  ...
  ImageView imageView = (ImageView) findViewById(R.id.my_image_view);

  Glide.with(this).load("http://goo.gl/gEgYUd").into(imageView);
}

// For a simple image list:
@Override public View getView(int position, View recycled, ViewGroup container) {
  final ImageView myImageView;
  if (recycled == null) {
    myImageView = (ImageView) inflater.inflate(R.layout.my_image_view, container, false);
  } else {
    myImageView = (ImageView) recycled;
  }

  String url = myUrls.get(position);

  Glide
    .with(myFragment)
    .load(url)
    .centerCrop()
    .placeholder(R.drawable.loading_spinner)
    .into(myImageView);

  return myImageView;
}

Status

Version 4 is now released and stable. Updates are released periodically with new features and bug fixes.

Comments/bugs/questions/pull requests are always welcome! Please read CONTRIBUTING.md on how to report issues.

Compatibility

• Minimum Android SDK: Glide v4 requires a minimum API level of 14.
• Compile Android SDK: Glide v4 requires you to compile against API 26 or later.

If you need to support older versions of Android, consider staying on Glide v3, which works on API 10, but is not actively maintained.

• OkHttp 3.x: There is an optional dependency available called okhttp3-integration, see the docs page.
• Volley: There is an optional dependency available called volley-integration, see the docs page.
• Round Pictures: CircleImageView/CircularImageView/RoundedImageView are known to have issues with TransitionDrawable (.crossFade() with .thumbnail() or .placeholder()) and animated GIFs, use a BitmapTransformation (.circleCrop() will be available in v4) or .dontAnimate() to fix the issue.
• Huge Images (maps, comic strips): Glide can load huge images by downsampling them, but does not support zooming and panning ImageViews as they require special resource optimizations (such as tiling) to work without OutOfMemoryErrors.

Build

Building Glide with gradle is fairly straight forward:

git clone https://github.com/bumptech/glide.git
cd glide
./gradlew jar

Note: Make sure your Android SDK has the Android Support Repository installed, and that your $ANDROID_HOME environment variable is pointing at the SDK or add a local.properties file in the root project with a sdk.dir=... line.

Samples

Follow the steps in the Build section to set up the project and then:

./gradlew :samples:flickr:run
./gradlew :samples:giphy:run
./gradlew :samples:svg:run
./gradlew :samples:contacturi:run

You may also find precompiled APKs on the releases page.

Development

Follow the steps in the Build section to setup the project and then edit the files however you wish. Android Studio cleanly imports both Glide's source and tests and is the recommended way to work with Glide.

To open the project in Android Studio:

1. Go to File menu or the Welcome Screen
2. Click on Open...
3. Navigate to Glide's root directory.
4. Select setting.gradle

For more details, see the Contributing docs page.

Getting Help

To report a specific problem or feature request, open a new issue on Github. For questions, suggestions, or anything else, email Glide's discussion group, or join our IRC channel: irc.freenode.net#glide-library.

 

Contributing

Before submitting pull requests, contributors must sign Google's individual contributor license agreement.

 

Thanks

• The Android team and Jake Wharton for the disk cache implementation Glide's disk cache is based on.
• Dave Smith for the GIF decoder gist Glide's GIF decoder is based on.
• Chris Banes for his gradle-mvn-push script.
• Corey Hall for Glide's amazing logo.
• Everyone who has contributed code and reported issues!

 

Author

Sam Judd - @sjudd on GitHub, @samajudd on Twitter

License

BSD, part MIT and Apache 2.0. See the LICENSE file for details.

Disclaimer

This is not an official Google product.