如何修复下载

Question

我是android开发的新手，我开发了一个应用程序，可以下载，保存然后在videoview中播放视频。该应用程序只能在某些手机上使用，而不能在其他手机上使用。该应用程序图标也将不适用于这些型号。我已经看过代码，但是没有运气。

我尝试在4个不同的手机上安装该应用程序，并且可以在其中2个手机上运行，​​但我无法弄清楚出了什么问题

class DownloadVideoFromURL extends AsyncTask<String, String, String> {
        DownloadVideoFromURL() {
        }

        protected void onPreExecute() {
            super.onPreExecute();
            VidDetailFragment.this.pDialog.show();
        }

        protected String doInBackground(String... vidFilename) {
            try {
                URL url = new URL(VidDetailFragment.this.getVidUrl(vidFilename[0]));
                URLConnection connection = url.openConnection();
                connection.connect();
                int lengthOfFile = connection.getContentLength();
                InputStream input = new BufferedInputStream(url.openStream(), 8192);
                OutputStream output = new FileOutputStream(VidDetailFragment.this.getVidPath(vidFilename[0]));
                byte[] data = new byte[1024];
                long total = 0;
                while (true) {
                    int count = input.read(data);
                    if (count == -1) {
                        break;
                    }
                    total += (long) count;
                    publishProgress(new String[]{"" + ((int) ((100 * total) / ((long) lengthOfFile)))});
                    output.write(data, 0, count);
                }
                output.flush();
                output.close();
                input.close();
            } catch (FileNotFoundException e) {
                Log.e("Deafop Error:.", e.getMessage());
            } catch (Exception e2) {
                Log.e("Deafop Error: ", e2.getMessage());
            }
            return vidFilename[0];
        }

        protected void onProgressUpdate(String... progress) {
            VidDetailFragment.this.pDialog.setProgress(Integer.parseInt(progress[0]));
        }

        protected void onPostExecute(String vidFilename) {
            VidDetailFragment.this.pDialog.dismiss();
            VidDetailFragment.this.playVideo(vidFilename);
        }
    }

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments().containsKey(ARG_ITEM_ID)) {
            Log.e("Deafop", "Loading Video: " + getArguments().getString(ARG_ITEM_ID));
            this.mItem = (Vid) VidClass.ITEM_MAP.get(getArguments().getString(ARG_ITEM_ID));
        }
    }

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_vid_detail, container, false);
        this.mVideoView = (VideoView) rootView.findViewById(R.id.videoview);
        if (this.mItem != null) {
            String vidFilename = this.mItem.video + ".mp4";
            Log.d("Deafop", "Video File " + vidFilename);
            if (new File(getVidPath(vidFilename)).exists()) {
                playVideo(vidFilename);
            } else {
                Log.d("Deafop", "Sorry, video file missing, attempting download from: " + getVidUrl(vidFilename));
                this.pDialog = ProgressDialog.show(getActivity(), "Please wait", "Downloading Video...", false, true);
                this.pDialog.setMax(100);
                this.pDialog.setProgressStyle(1);
                new DownloadVideoFromURL().execute(new String[]{vidFilename});
            }
            ((TextView) rootView.findViewById(R.id.vid_detail)).setText(this.mItem.word + ": " + this.mItem.description + " " + this.mItem.memoryaid);
            this.mVideoView.setOnTouchListener(new C01351());
        }