Glide4用法详解

开始首先在app/build.gradle文件中增加如下依赖：

dependencies {
    implementation 'com.github.bumptech.glide:glide:4.8.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.8.0'
}
再添加上网络权限

加载图片
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
 
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="click"
        android:text="点击" />
 
    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

public class MainActivity extends Activity {

    private ImageView imageView;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView = findViewById(R.id.imageView);
    }
 
    public void click(View view) {
        String url = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1539918930434&di=e9ce5f3b1888347b02d94ed2e090087c&imgtype=0&src=http%3A%2F%2Fc16.eoemarket.net%2Fapp0%2F576%2F576906%2Fscreen%2F2940682.jpg";
        Glide.with(this).load(url).into(imageView);
    }
 
}
占位图
设置加载中图片：

        RequestOptions options = new RequestOptions().placeholder(R.mipmap.ic_loading);
        String url = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1539918930434&di=e9ce5f3b1888347b02d94ed2e090087c&imgtype=0&src=http%3A%2F%2Fc16.eoemarket.net%2Fapp0%2F576%2F576906%2Fscreen%2F2940682.jpg";
        Glide.with(this).load(url).apply(options).into(imageView);
设置加载失败图片：

  RequestOptions options = new RequestOptions().placeholder(R.mipmap.ic_loading).error(R.mipmap.ic_fail);
        String url = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1539918930434&di=e9ce5f3b1888347b02d94ed2e090087c&imgtype=0&src=http%3A%2F%2Fc16.eoemarket.net%2Fapp0%2F576%2F576906%2Fscreen%2F2940682.jpg";
        Glide.with(this).load(url).apply(options).into(imageView);
指定图片大小
Glide默认会根据ImageView的大小决定图片的大小，保证图片不会导致OOM，但是还是可以对图片的大小进行修改的

        RequestOptions options = new RequestOptions().override(100,100);
        String url = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1539918930434&di=e9ce5f3b1888347b02d94ed2e090087c&imgtype=0&src=http%3A%2F%2Fc16.eoemarket.net%2Fapp0%2F576%2F576906%2Fscreen%2F2940682.jpg";
        Glide.with(this).load(url).apply(options).into(imageView);
如果想加载一张原始尺寸的图片，可以使用Target.SIZE_ORIGINAL关键字