Question

我使用自定义视频活动捕获了视频，并使用此方法将其编码为base64

private String encodeVideoTobase64(Uri uri , int index)
{
    String videodata     = "";
    String[] filePathColumn = { MediaStore.Video.Media.DATA };

    Cursor cursor = this.getContentResolver().query(uri,filePathColumn, null, null, null);
    String videoPath;
    try{
        cursor.moveToFirst();

        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        videoPath       = cursor.getString(columnIndex);
    }
    catch(Exception e)
    {
        videoPath = PathsOfVideos.get(index);
    }
    try {
        @SuppressWarnings("resource")
        FileInputStream v_input = new FileInputStream(videoPath);
        ByteArrayOutputStream objByteArrayOS = new ByteArrayOutputStream();
        byte[] byteBufferString = new byte[1024];
        for (int readNum; (readNum = v_input.read(byteBufferString)) != -1;) 
        {
            objByteArrayOS.write(byteBufferString, 0, readNum);
            System.out.println("read " + readNum + " bytes,");
        }

       videodata = MyBase64.encodeBytes(byteBufferString);//Base64.encodeToString(objByteArrayOS.toByteArray(), Base64.DEFAULT);

    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return videodata;
}

然后我将编码的视频发送到服务器。

现在我想获取视频base64字符串，对其进行解码并在视频视图中显示。我尝试将base64字符串转换为字节数组，然后将其保存到移动设备，然后使用此代码在视频视图中显示它。

protected void showInstVideo(int pos) {
    // TODO Auto-generated method stub
    final Dialog dialog = new Dialog(this);
    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE); 
    dialog.setContentView(R.layout.dialog_video);

    //Decode String To Video With mig Base64.
    String encodedString = r.getRecipeInstructions().get(pos).getVideoStr();
    if (encodedString.compareTo("")!=0) {
        byte[] decodedBytes = MiGBase64.decodeFast(encodedString.getBytes());

        try {
            Date date=new Date();
            String filename="/rec"+ date.toString().replace(" ", "_").replace(":", "_")+".mp4";
            String root = Environment.getExternalStorageDirectory().toString();
            File myDir  = new File(root+"/MyAppName");
            if (!myDir.exists())
                myDir.mkdir();
            File file = new File (myDir, filename);

            FileOutputStream out = new FileOutputStream(file);
            out.write(decodedBytes);
            out.close();

            VideoView instvideo     = (VideoView) dialog.findViewById(R.id.vvdetails);
            MediaController mediaController = new MediaController(this);
            mediaController.setAnchorView(instvideo);
            Uri video = Uri.parse(file.getPath());
            instvideo.setVideoURI(video);

            if (video != null )
            {
                dialog.show();
                instvideo.start();
            }
        } catch (Exception e) {
            // TODO: handle exception
            Log.e("Error", e.toString()); 
        }
    }


}

但是没有创建文件夹/ MyAppName，因此视频没有保存，当然因此我无法播放视频。

你可以帮我找一下我错过的东西吗？提前致谢

注意：代码运行正常，不会捕获任何异常

Answer 1

您也可以使用mkdir()代替mkdirs()。 mkdirs()将创建所有目录，直到给定路径中的最后一个目录。

替换此代码：

File myDir  = new File(root + File.separator + "MyAppName");
myDir.mkdirs();
File file = new File (myDir.getAbsolutePath(), filename);

使用：

File myDir  = new File(root+"/MyAppName");
if (!myDir.exists())
    myDir.mkdir();
File file = new File (myDir, filename);

将字节数组保存为.mp4文件并在VideoView android中播放

1 个答案: