Loittle动画

参考以下网站
官方网址
github地址

使用步骤:
1、添加依赖
implementation 'com.airbnb.android:lottie:$lottieVersion'
2、在xml里写入

<com.airbnb.lottie.LottieAnimationView
          android:id="@+id/lottieAnimationView"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          app:lottie_fileName="hello-world.json"
          app:lottie_loop="true"
          app:lottie_autoPlay="true" />

3、在java代码里使用(加载assets目录下的json文件)

lottieAnimationView = findViewById(R.id.lottieAnimationView);
        lottieAnimationView.setImageAssetsFolder("images");
        lottieAnimationView.setAnimation("data.json");
        lottieAnimationView.loop(true);
        lottieAnimationView.playAnimation();

几种常用方式:
1、加载服务器上的json文件

LottieComposition.Factory.fromJson(getResources(), json, new OnCompositionLoadedListener() {
    @Override
    public void onCompositionLoaded(LottieComposition composition {
      lottieAnimationView.setComposition(composition);
      lottieAnimationView.playAnimation();
    }
});

2、通过url加载服务器上的压缩包
直接加载:

 lottieAnimationView.setAnimationFromUrl(url);
 lottieAnimationView.playAnimation();

下载到本地指定文件夹再加载:

 // 资源zip
    public final static File LOTTIE_FILES = new File(Environment.getExternalStorageDirectory()+"/ctclient/lottie/lottie.zip");
    // 动效图片资源
    public final static File IMAGES_FILES = new File(Environment.getExternalStorageDirectory()+"/ctclient/lottie/images");
    // data.json路径
    public final static File JSON_FILE = new File(Environment.getExternalStorageDirectory()+"/ctclient/lottie/data.json");
    
    FileInputStream fis = null;
    if (JSON_FILE.exists()) {
        try {
            fis = new FileInputStream(JSON_FILE);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
    if (fis == null || !IMAGES_FILES.exists()) {
        Log.i("huangssh", "动画资源不存在");
        return;
    }
    final String absolutePath = IMAGES_FILES.getAbsolutePath();
    // 开启硬件加速
    lottieAnimationView.useHardwareAcceleration(true);
    // 设置动画文件夹代理类
    lottieAnimationView.setImageAssetDelegate(new ImageAssetDelegate() {
        @Override
        public Bitmap fetchBitmap(LottieImageAsset asset) {
            BitmapFactory.Options opts = new BitmapFactory.Options();
            opts.inScaled = true;
            opts.inDensity = UtilPhoneParam.densityDpi;
            Bitmap bitmap = null;
            try {
                bitmap = BitmapFactory.decodeFile(absolutePath + File.separator + asset.getFileName(), opts);
            }catch (Exception e){
                e.printStackTrace();
            }
            return bitmap;
        }
    });
    
    // 设置动画
    LottieComposition.Factory.fromInputStream(fis, new OnCompositionLoadedListener() {
        @Override
        public void onCompositionLoaded(@Nullable LottieComposition composition) {
            lottieAnimationView.setComposition(composition);
            lottieAnimationView.playAnimation();
        }
    });

常用方法:
1、监听动画进度

    lottieAnimationView.addAnimatorUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator valueAnimator) {
            // 判断动画加载结束
            if (valueAnimator.getAnimatedFraction() == 1f) {
                if (dialog.isShowing() && getActivity() != null)
                    dialog.dismiss();
            }
        }
    });

播放、暂停、取消

lottieAnimationView.pauseAnimation();
lottieAnimationView.cancelAnimation();
lottieAnimationView.playAnimation();