ThumbnailUtils.createVideoThumbnail不适用于nougat设备

Question

Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(localUrl,
     MediaStore.Video.Thumbnails.MINI_KIND);

这里位图给了我null值。

Answer 1

我遇到的完全相同的情况，只是它无法在更高版本或高额定设备中创建视频缩略图。你正在OnActivityResult中获得这样的视频路径。

  if (requestCode == 3 && resultCode == RESULT_OK && data != null && data.getData() != null) {
                    Uri uri = data.getData();
                    String mimeType = getActivity().getContentResolver().getType(uri);
                    String extension = MimeTypeMap.getSingleton().getExtensionFromMimeType(mimeType);
                    String[] filePathColumn = {MediaStore.Images.Media.DATA};
                    Cursor cursor = getActivity().getContentResolver().query(uri, filePathColumn, null, null, null);
                    cursor.moveToFirst();
                    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                    picturePath = cursor.getString(columnIndex);
                    Log.e("PICTURE PATH", picturePath);
                    File file = new File(picturePath);
                    long length = file.length();
                    length = length / 1024;
                    long length2 = length / 1024;
                    if (length2 > 25) {
                        Toast.makeText(getActivity(), "You cannot upload file more than 25 MB", Toast.LENGTH_SHORT).show();
                    } else {

                        if (mimeType.contains("image")) {
                            Log.e("mimeType", mimeType);
                            Log.e("gif", picturePath);
                            Intent intent = new Intent(getActivity(), UploadImagePostActivity.class);
                            intent.putExtra("DESTINATION", picturePath);
                            startActivity(intent);
                            getActivity().finish();

                        } else if (mimeType.contains("video")) {

                            Log.e("mimeType", mimeType);
                            Log.e("Video path", picturePath);
                            Intent intent = new Intent(getActivity(), UploadVideoPostActivity.class);
                            intent.putExtra("VIDEO_DESTINATION", picturePath);
                            startActivity(intent);
                            getActivity().finish();

                        }
                    }
                }

现在，您将获得视频路径，并且必须在获取视频路径后制作视频缩略图。有时它可能会引起无法获得正确路径的问题，因为某些设备具有不同的路径层次结构。因此，您必须将缩略图保存在特定位置并将其检索回来。代码如下。

// type 2 for video
    File uri = new File(filePath);

    //create thumbnail image
    thumb = ThumbnailUtils.createVideoThumbnail(filePath, MediaStore.Video.Thumbnails.MINI_KIND);
    img_tumbnail.setImageBitmap(thumb);

    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            try {
                thumbNailfile = savebitmap(thumb);
                Log.e("Thumbnail path", "" + thumbNailfile);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    });

和特定路径上的保存缩略图文件。现在它将返回正确的文件路径。

// save bitmap into internal memory
public static File savebitmap(Bitmap bmp) throws IOException {
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    bmp = ((BitmapDrawable) img_tumbnail.getDrawable()).getBitmap();
    bmp.compress(Bitmap.CompressFormat.JPEG, 40, bytes);
    //
    thumnailImagePath = Environment.getExternalStorageDirectory() + File.separator + "123.jpg";
    File f = new File(Environment.getExternalStorageDirectory()
            + File.separator + "123.jpg");
    f.createNewFile();
    FileOutputStream fo = new FileOutputStream(f);
    fo.write(bytes.toByteArray());
    fo.close();
    return f;
}