如何在WebView中缓存视频？

webView.getSettings().setAppCacheEnabled(true);
webView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);

String videoUrl = "http://example.com/video.mp4";
String fileName = videoUrl.substring(videoUrl.lastIndexOf('/') + 1);
File cacheFile = new File(context.getCacheDir(), fileName);
if (cacheFile.exists()) {
    // 缓存文件已存在，直接加载本地缓存文件
    webView.loadUrl("file://" + cacheFile.getAbsolutePath());
} else {
    // 缓存文件不存在，加载网络视频
    webView.loadUrl(videoUrl);
}

webView.setWebViewClient(new WebViewClient() {
    @Override
    public void onPageFinished(WebView view, String url) {
        super.onPageFinished(view, url);
        // 视频加载完成后将其缓存到本地
        if (url.endsWith(".mp4")) {
            String fileName = url.substring(url.lastIndexOf('/') + 1);
            File cacheFile = new File(context.getCacheDir(), fileName);
            try {
                InputStream inputStream = webView.getContext().getAssets().open(fileName);
                FileOutputStream outputStream = new FileOutputStream(cacheFile);
                byte[] buffer = new byte[1024];
                int length;
                while ((length = inputStream.read(buffer)) != -1) {
                    outputStream.write(buffer, 0, length);
                }
                inputStream.close();
                outputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
});