显示Android的GIF的最佳实践 [英] Best practice of showing gif in Android

问题描述

我试图加载GIF格式的列表，并显示在列表视图。目前，我显示的每个GIF成的WebView但它的速度很慢，看起来难看。我做了一些研究，但今天没有什么能够帮助我。

I tried to load a list of gifs and displays them on listview. Currently, I display each gif into a webview but it's very slow and looks ugly. I did some researches today but nothing could help me.

难道你们有什么伟大的想法，呈现平稳的GIF？顺便说一句，我把所有的GIF从URL链接。

Do you guys have any great idea that showing gifs smoothly? BTW, I got all gifs from url links.

推荐答案

我会建议利用近期开源库，被Facebook发布的，被称为壁画的 https://github.com/facebook/fresco 。从我的经验，它通过使用一些花哨的高速缓存方法VM堆之外，以避免GC对位图/图像效果惊人的GIF处理相当不错。用户指南： http://frescolib.org/docs/getting -started.html＃_

I would recommend utilising a recently open sourced library, released by Facebook, called fresco https://github.com/facebook/fresco. From my experience, it handles GIFs quite nicely by using some fancy caching methods outside of VM heap to avoid staggering effects of GC on bitmaps/images. User guide: http://frescolib.org/docs/getting-started.html#_

下面就是落实到一个列表视图基本适配器：

Below is just a basic adapter to implement into a listview:

public class FrescoGifAdapter extends BaseAdapter {


    ArrayList<String> urlList;
    private static LayoutInflater inflater=null;

    public FrescoGifAdapter(Activity activity, ArrayList<String> urlList) {

        if(urlList==null) {
            this.urlList = new ArrayList<>();
        }
        else {
            this.urlList = urlList;
        }
        inflater = (LayoutInflater)activity.
                getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    }

    public int getCount() {
        return urlList.size();
    }

    public String getItem(int position) {
        return urlList.get(position);
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {

        View vi = convertView;

        if(convertView==null){
            vi = inflater.inflate(R.layout.fresco_item, null);
            //Load Uri with URL.
            Uri uri = Uri.parse(getItem(position));

            SimpleDraweeView draweeView = (SimpleDraweeView) vi.findViewById(R.id.my_image_view);

            //Controller is required for controller the GIF animation, here I have just set it to autoplay as per the fresco guide.
            DraweeController controller = Fresco.newDraweeControllerBuilder()
                    .setUri(uri)
                    .setAutoPlayAnimations(true)
                    .build();
            //Set the DraweeView controller, and you should be good to go.
            draweeView.setController(controller);

        }

        return vi;
    }

}

fresco_item.xml （你可以改变尺寸以适应，我只是默认，指导尺寸）。需要注意的是比例已经由壁画进行处理。事实上，他们建议不要设置任何自定义的的ImageView 的属性，因为它打破的东西。

fresco_item.xml (You can change dimensions to suit, I just defaulted to guide dimensions). Caveat is scaling has to be handled by fresco. In fact, they advise against setting any custom ImageView attributes as it breaks stuff.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:fresco="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <com.facebook.drawee.view.SimpleDraweeView
        android:id="@+id/my_image_view"
        android:layout_width="130dp"
        android:layout_height="130dp"
        fresco:placeholderImage="@drawable/ic_launcher"
        />


</LinearLayout>

然后在你的onCreate：

And then in your onCreate:

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //Required by Fresco to be initalized before setContentView.
        Fresco.initialize(this);
        setContentView(R.layout.activity_main);
        ListView lv = (ListView) findViewById(R.id.listview);
        ArrayList<String> urlList = new ArrayList<>();
        //Load neon cats
        for(int i = 0; i < 10; i++) {
            urlList.add("https://media3.giphy.com/media/JLQUx1mbgv2hO/200.gif");
        }

        lv.setAdapter(new FrescoGifAdapter(this, urlList));

    }

这篇关于显示Android的GIF的最佳实践的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！