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This article mainly explains "what is the usage of Glide in Android Picture loading Library". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the usage of Glide in Android Picture loading Library".

Glide introduction

Glide is a fast and efficient Android image loading library that focuses on smooth scrolling. Glide provides easy-to-use API, high-performance, scalable image decoding pipeline, and automatic resource pool technology. The main goal of Glide is to make the scrolling of any kind of picture list as fast and smooth as possible.

Android SDK requirements

Min Sdk Version-min SDK version API 14 (Ice Cream Sandwich) or higher is required to use Glide.

Compile Sdk Version-Glide must be compiled using API 27 (Oreo MR1) or later SDK.

Support Library Version-Glide uses version 27 of the support library.

Preparation before use

download

Jar

You can download the latest jar package directly from GitHub. You also need a jar package that contains the Android v4 support library.

Gradle

Add the following dependencies to build.gradle

Implementation 'com.github.bumptech.glide:glide:4.12.0'annotationProcessor' com.github.bumptech.glide:compiler:4.12.0'

Maven

If you use Maven, you can also add dependencies on Glide. Again, you still need to add dependencies on the Android support library

Com.github.bumptech.glide glide 4.11.0 aar com.google.android support-v4 r7 com.github.bumptech.glide compiler 4.11.0 true

Set up

Load pictures from the network

Load pictures from local storage

Basic usage Glide.with (fragment) / / pass activity or fragment .load (url) / / local or network address .into (imageView); / / ImageView object

This allows the picture to be loaded into the specified ImageView

Use in ListView and RecyclerView

The code for loading pictures in ListView or RecyclerView is exactly the same as loading in a separate View

@ Overridepublic void onBindViewHolder (ViewHolder holder, int position) {String url = urls.get (position); Glide.with (fragment) .load (url) .into (holder.imageView);} placeholder

Glide has three placeholders: show placeholder Drawable when the request is executing, error Drawable if the request fails, and null if the url of the request is null, then fallback url will be displayed

Glide.with (activity) .load (url) .placeholder (R.drawable.loading) / / Picture displayed when requesting a picture. Error (R.drawable.error) / / Picture displayed when request fails. Fallback (R.drawable.fallback) / / Picture address (url) is empty. Into (imageView) Option RequestOptions requestOptions = new RequestOptions () .placeholder (R.drawable.loading) .error (R.drawable.error); Glide.with (fragment) .load (url) .apply (requestOptions) .into (imageView)

The apply () method can be called multiple times, so RequestOption can be combined. If there are conflicting settings between RequestOptions objects, only the last applied RequestOptions will take effect.

Transition animation

In Glide, Transitions allows you to define how Glide transitions from placeholders to newly loaded images, or from thumbnails to full-size images. Transition works in the context of a single request, not across multiple requests. Therefore, Transitions does not allow you to define animation from one request to another (for example, cross-fade effects)

DrawableCrossFadeFactory factory = new DrawableCrossFadeFactory.Builder (). SetCrossFadeEnabled (true). Build (); GlideApp.with (context) .load (url) .apply (requestOptions) .placeholder (R.color.placeholder) .into (imageView)

In addition to the cross-fade effect, you can also customize

Transformation effect

May not be converted when the url address is png

RequestOptions requestOptions = new RequestOptions () .placeholder (R.drawable.loading) .error (R.drawable.error) Glide.with (MainActivity.this) .load (url) .apply (requestOptions) .transform (new CircleCrop ()) / / fillet picture / / .transform (new RoundedCorners (30)) / / circular picture angle unify / / .transform (new GranularRoundedCorners (30,50,70,80)) / / four corners separately specify the angle / / .transform (new Rotate (90)) / / rotate the angle clockwise .into (imageView)

Fillet transformation effect

Clockwise rotation effect

Use the example

Loading and error are downloaded to the local image in advance and placed in drawable. Url can be the address of a network image.

Public class MainActivity extends AppCompatActivity {@ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); setContentView (R.layout.activity_main); String url = "url of picture"; ImageView imageView = findViewById (R.id.image_view) Glide.with (this) .load (url) .placeholder (R.drawable.loading) .error (R.drawable.error) .into (imageView);}}

Layout file

The permissions are set as follows

The following figure shows how the network address is loaded. If the wrong network address is passed in the left, the error diagram will be displayed; if the network picture address is correct, the correct picture will be put into the ImageView; and when the picture is not loaded, the ImageView will show the loading diagram.

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