Android/VideoView/ダウンロード

サンプル

class VideoDownloaderConnection extends AsyncTask<Void, Long, Boolean> {
    private String TAG = "VideoDownloaderConnection";
    private Context context;
    String url = "";
    public VideoDownloaderConnection(Context context) {
        this.context = context;
    }
    public void setUrl(String url) {
        this.url = url;
    }
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }
    @Override
    protected Boolean doInBackground(Void... params) {
        URL u = null;
        InputStream is = null;
        try {
            u = new URL(url);
            is = u.openStream();
            HttpURLConnection huc = (HttpURLConnection)u.openConnection();
            int size = huc.getContentLength();
            if(huc != null) {
                String fileName = "FILE.mp4";
                String storagePath = context.getExternalCacheDir().toString();
                File f = new File(storagePath,fileName);
                FileOutputStream fos = new FileOutputStream(f);
                byte[] buffer = new byte[1024];
                int len1 = 0;
                if(is != null) {
                    while ((len1 = is.read(buffer)) > 0) {
                        fos.write(buffer,0, len1);
                    }
                }
                if(fos != null) {
                    fos.close();
                }
            }
        } catch (MalformedURLException mue) {
            mue.printStackTrace();
        } catch (IOException ioe) {
            ioe.printStackTrace();
        } finally {
            try {
                if(is != null) {
                    is.close();
                }
            } catch (IOException ioe) {
            }
        }
        return true;
    }
    @Override
    protected void onProgressUpdate(Long... values) {
        super.onProgressUpdate(values);
    }
    @Override
    protected void onPostExecute(Boolean aBoolean) {
        super.onPostExecute(aBoolean);
        Log.i(TAG, "onPostExecute");
    }
}

上記サンプルDLの使い方

VideoDownloaderConnection connection = new VideoDownloaderConnection(MainActivity.this.getApplicationContext());
connection.setUrl("~.mp4");
connection.execute();

ストレージをcachedirとしているがいろいろ変更できる

String storagePath = context.getExternalCacheDir().toString(); // cachedir

参考：http://blog.lciel.jp/blog/2014/02/08/android-about-storage/

上記DLしたmp4のvideoViewでの再生

mVideoView.setVideoPath(getApplicationContext().getExternalCacheDir().toString() + "/FILE.mp4");

参考

動画のダウンロード https://blog.engineer.adways.net/entry/2016/09/03/010627

Webview download/cache video https://stackoverflow.com/questions/23876103/webview-download-cache-video

YoutubeDownloadMp4 https://stackoverflow.com/questions/7203047/code-for-download-video-from-youtube-on-java-android