Question

我目前有一个应用程序可以从android库导入视频，制作它们的副本，然后删除旧文件，如果用户想要的话。

现在，我需要用户能够撤消该操作并将视频从应用程序的内部存储转移到Android库。

这是我迄今为止所尝试的内容：

        //storage/emulated/0/Pictures -- getPath() of line below
        File androidVidGalleryPath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);

        File hiddenVideo = new File("/data/data/mypackagename/app_vidDir/vid_10.mp4");
        File exportedVid = new File(androidVidGalleryPath.getPath()+"/DesiredAlbumName/"+"DesiredVideoName");

        try {
            FileOutputStream newFile = new FileOutputStream (exportedVid);
            FileInputStream oldFile = new FileInputStream (hiddenVideo);

            // Transfer bytes from in to out
            byte[] buf = new byte[1024]; //this will only read 1KB of data, definitely not enough for an entire video.
            oldFile.read(buf);
            newFile.write(buf, 0, buf.length);
            newFile.flush();
            newFile.close();
            oldFile.close();
        } catch (IOException e) {
            Toast.makeText(getActivity(),"ERROR",Toast.LENGTH_LONG).show();
            e.printStackTrace();
        }

        Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        File f = new File(exportedVid.getPath());
        Uri contentUri = Uri.fromFile(f);
        mediaScanIntent.setData(contentUri);
        getActivity().sendBroadcast(mediaScanIntent);

出于某种原因，没有任何事情发生，除了警告吐司，try catch导致IOException。

我不确定发生了什么，有什么想法吗？

Answer 1

当您编写文件时，您不需要while循环。：

byte[] buf = new byte[1024]; //this will only read 1KB of data, definitely not enough for an entire video.
oldFile.read(buf);
newFile.write(buf, 0, buf.length);

转移视频后，请执行此操作（从此处：https://developer.android.com/training/camera/photobasics.html#TaskGallery）

private void galleryAddPic() {
    Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    File f = new File(mCurrentPhotoPath);
    Uri contentUri = Uri.fromFile(f);
    mediaScanIntent.setData(contentUri);
    this.sendBroadcast(mediaScanIntent);
}

将内部存储的视频导出到android库

1 个答案: