Fresco图片加载

//布局

<com.facebook.drawee.view.SimpleDraweeView
        app:viewAspectRatio="2"
        app:fadeDuration="2000"
        app:roundingBorderColor="@color/colorPrimary"
        app:roundingBorderWidth="10dp"
        android:id="@+id/simple_drawee_view"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        app:actualImageScaleType="centerCrop"
        app:failureImage="@drawable/icon_failure"
        app:placeholderImage="@drawable/icon_placeholder"
        app:placeholderImageScaleType="centerInside"
        app:progressBarImage="@drawable/icon_progress_bar"
        app:retryImage="@drawable/icon_retry"
        app:roundBottomRight="false"
        app:roundTopLeft="true"

        app:roundedCornerRadius="20dp" />

//java代码

public class MainActivity extends AppCompatActivity {

    private SimpleDraweeView simpleDraweeView;
    public static final String mImageUrl = "http://pic39.nipic.com/20140226/18071023_164300608000_2.jpg";
    public static final String mGifUrl = "http://img.zcool.cn/community/0139505792e5fc0000018c1bbb7271.gif";
    public static final String mjpegUrl = "http://og3u5glro.bkt.clouddn.com/%E6%B8%90%E8%BF%9B%E5%BC%8F%E5%9B%BE%E7%89%87.jpg";   //这是渐进式的图片

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        simpleDraweeView = findViewById(R.id.simple_drawee_view);
        simpleDraweeView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //手动控制gif播放，注意：必须判空，否则静态图会奔溃
                Animatable animatable = simpleDraweeView.getController().getAnimatable();
                if(animatable !=null){
                    animatable.start();
                }
            }
        });

        //设置Url
        Uri uri = Uri.parse(mjpegUrl);

        //设置图片的Uri
//        simpleDraweeView.setImageURI(uri);


        // 1.hierarchy不能和xml中的属性共存，如果都有以java为准 ，所有xml属性都可以通过hierarchy来设置
        GenericDraweeHierarchy hierarchy = new GenericDraweeHierarchyBuilder(getResources())
                //设置故障图像
                .setFailureImage(R.drawable.icon_failure)
                //设置进度条图像
                .setProgressBarImage(R.drawable.icon_progress_bar)
                //设置占位符图像
                .setPlaceholderImage(R.drawable.icon_placeholder)
                //设置渐变持续时间
                .setFadeDuration(2000)
                .build();
        simpleDraweeView.setHierarchy(build);

        //2.如果想对下xml中进行修改需要先获取对应的hierarchy，然后直接修改他就可以
//        GenericDraweeHierarchy hierarchy1 = simpleDraweeView.getHierarchy();
//        hierarchy1.setFadeDuration(2000);
//        RoundingParams params =new RoundingParams();
//        params.setCornersRadii(20,0,20,0);
//        //可以通过setRoundingParams来在java代码中设置圆角一些属性
//        hierarchy1.setRoundingParams(params);


        //controller
        ImageRequest imageRequest = ImageRequestBuilder.newBuilderWithSource(uri)
                //设置支持渐进式加载
                .setProgressiveRenderingEnabled(true)
                .build();
        AbstractDraweeController controller = Fresco.newDraweeControllerBuilder()
                //如果使用controller，需要再controller中设置Uri才能正常展示
                .setUri(uri)
                //如果支持重试，必须再controller中控制
                .setTapToRetryEnabled(true)
                //设置支持的Gif自动播放
//                .setAutoPlayAnimations(true)
                //通过imageRequest，支持渐进式加载
                .setImageRequest(imageRequest)
                .build();

        simpleDraweeView.setController(controller);
//        simpleDraweeView.setHierarchy(hierarchy);
    }
}

//App初始化

public class App extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        //初始化Fresco ,必须再setContentView之前进行
        Fresco.initialize(this);
    }
}