1.安装依赖

//build.gradle
dependencies {
    implementation 'com.facebook.fresco:fresco:2.0.0'
    ...
}

2.添加权限配置

//AndroidManifest.xml
 <uses-permission android:name="android.permission.INTERNET" />   //允许进行网络请求

3.MainActivity

一定要配置在setContentView前面

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //alt+enter自动导入包
        Fresco.initialize(this);        //添加这一行会报错点击alt+enter,
        setContentView(R.layout.activity_main);
    }
}

4.在xml布局文件中, 加入命名空间：

<LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"    //这两行
        xmlns:fresco="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >

5.加入SimpleDraweeView:

替换掉ImageView模块

<com.facebook.drawee.view.SimpleDraweeView
    android:id="@+id/my_image_view"
    android:layout_width="130dp"
    android:layout_height="130dp"
    fresco:placeholderImage="@drawable/my_drawable"
  />

6.开始加载图片

 Uri uri = Uri.parse("https://raw.githubusercontent.com/facebook/fresco/gh-     pages/static/logo.png");
        SimpleDraweeView draweeView = (SimpleDraweeView) findViewById(R.id.my_image_view);
        draweeView.setImageURI(uri);

// MainActivity
public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
       ...
        //导入以下几行
        Uri uri = Uri.parse("https://raw.githubusercontent.com/facebook/fresco/gh-pages/static/logo.png");
        SimpleDraweeView draweeView = (SimpleDraweeView) findViewById(R.id.my_image_view);
        draweeView.setImageURI(uri);
    }
}