如何在Android中使用壁画设置渐进式JPEG

Question

I have just started using fresco and I have followed the steps in their documentation. I have been able to load URIs into the SimpleDraweeView within my listview adapter and now I am trying to implement progressive jpegs(images increase in quality as they load). The problem is that the code they have given in the site is not working as expected. The Uri is being loaded, but not progressively(The image is not gradually increasing in quality as it loads). Is there something I am missing or have forgotten to add?

Here is my build dependency:

compile 'com.facebook.fresco:fresco:0.13.+'

I have already added this in my application class:

//For fresco
 Fresco.initialize(this);

Here is my xml

<com.facebook.drawee.view.SimpleDraweeView
                android:id="@+id/tag_iv_tu"
                android:layout_width="@dimen/tu_tag_side"
                android:layout_height="@dimen/tu_tag_height"
                android:layout_centerInParent="true"
                android:layout_gravity="center_horizontal"
                fresco:placeholderImage="@drawable/abc_ic_menu_share_mtrl_alpha" />

And here is the code within the getView() method in my listview adapter

ImageRequest request = ImageRequestBuilder.newBuilderWithSource(fileUri)
                            .setProgressiveRenderingEnabled(true)
                            .build();
                    DraweeController controller = Fresco.newDraweeControllerBuilder()
                            .setImageRequest(request)
                            .setOldController(holder.tag_iv_tu.getController())
                            .build();
                    holder.tag_iv_tu.setController(controller);

Answer 1

You must set the ResizeOption for the ImageRequst,because the progressily depends on ResizeOptions.

Try this:

ResizeOptions options = new ResizeOptions(width, height);

ImageRequest request = ImageRequestBuilder
            .newBuilderWithSource(Uri.parse(uri))
            .setProgressiveRenderingEnabled(true).setResizeOptions(options)
            .build();

Answer 2

Use this code :

        String url ="http://...";
        Uri uri = Uri.parse(url);

        ImageRequest request = ImageRequestBuilder.newBuilderWithSource(uri)
                .setProgressiveRenderingEnabled(true)
                .build();

        DraweeController controller = Fresco.newDraweeControllerBuilder()
                .setImageRequest(request)
                .setOldController(image.getController())
                .build();

        mSimpleDraweeView.setController(controller);