如何从视频文件中获取图像

你好，我是韩国的开发者。我有一些问题，所以我进入这个网站。

    InputStream is;
    URL url = 
         new URL("http://112.216.25.58:8888/VOD_LAUNCHER/media/youtube_sample3.mp4");
    Uri uri = Uri.parse(url.toURI().toString());
    is = getContentResolver().openInputStream(uri);
    Bitmap bitmap = BitmapFactory.decodeStream(is);
    //Bitmap bitmap = BitmapFactory.decodeFile(url.toString());
    //MediaMetadataRetriever ret = new MediaMetadataRetriever();
    //ret.setDataSource(url.toString());
    //Bitmap bitmap = ret.getFrameAtTime(0);
    //mImageView.setImageURI(uri);

    //Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(uri.toString(), Thumbnails.MICRO_KIND);
    mImageView.setImageBitmap(bitmap);

private Bitmap getPreview(URI uri) {
        File image = new File(uri);

    BitmapFactory.Options bounds = new BitmapFactory.Options();
    bounds.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(image.getPath(), bounds);
    if ((bounds.outWidth == -1) || (bounds.outHeight == -1))
        return null;

    int originalSize = (bounds.outHeight > bounds.outWidth) ? bounds.outHeight
            : bounds.outWidth;

    BitmapFactory.Options opts = new BitmapFactory.Options();
    //opts.inSampleSize = originalSize / THUMBNAIL_SIZE;
    return BitmapFactory.decodeFile(image.getPath(), opts);     
}

private String getRealPathFromURI(Uri contentUri) {
    String[] proj = { MediaStore.Images.Media.DATA };
    CursorLoader loader = new CursorLoader(getApplicationContext(), 
                                              contentUri, proj, null, null, null);
    Cursor cursor = loader.loadInBackground();
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
}

我尝试使用 ThumbnailUtil 等，但它不起作用。 如何在android 4.0上获取ThumbnailImage？ 谢谢任何回复。

从 API 级别 8 开始，您可以这样做：

String path = /*get video path*/;
Bitmap thumb = ThumbnailUtils.createVideoThumbnail(path,
                MediaStore.Images.Thumbnails.MINI_KIND);

又好又简单:)