从Android中的Intent中选择时，文件返回空（“”）

胸怀万里世界，放眼无限未来。这篇文章主要讲述从Android中的Intent中选择时，文件返回空（“”）相关的知识，希望能为你提供帮助。
我正在尝试上传视频。我所做的是，我已经下载了一个示例视频并尝试使用意图选择视频。我期待的是我选择的文件，我会得到它并传递给网络并上传。由于我之前没有任何经验，我很难有时间处理它。

private void getFile() { Intent intent = new Intent(); intent.setType("video/*"); intent.setAction(Intent.ACTION_GET_CONTENT); startActivityForResult(Intent.createChooser(intent, "Select Video"), REQUEST_CODE_PICKER); }

当我选择视频时，我收到了一个uri onActivityResult

@Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (resultCode == Activity.RESULT_OK) { Uri uri = data.getData(); String uriPath = uri.getPath(); // uriPath = "/document/video:7876" File fileToUpload = new File(uriPath); // fileToUpload = "" String videoPath = getRealVideoPathFromURI(getContentResolver(),uri); // videoPath = "/storage/emulated/0/Download/testVideo.mp4" File videoFile = new File(videoPath); // videoFile = "" uploadFile(videoFile); } }

我尝试了两个路径（realPath和uriPath），看看我是否得到任何文件。如果我调试我可以看到fileToUpload和videoFile都是“”。要添加，将给出所有权限读取和写入。
这是从uri获取真实视频路径的代码

String getRealVideoPathFromURI(ContentResolver contentResolver , Uri contentURI){ Cursor cursor = contentResolver.query(contentURI, null, null, null, null); if (cursor == null) return contentURI.getPath(); else { cursor.moveToFirst(); int idx = cursor.getColumnIndex(MediaStore.Video.VideoColumns.DATA); try { return cursor.getString(idx); } catch (Exception exception) { return null; } } }

谁能帮我理解我做错了什么？我只需上传所选的视频文件。我这样做的方式是错的吗？如果是这样，那么这样做的正确方法是什么？由于我没有在没有搜索的情况下提出问题而没有找到答案，请尽量给我正确的答案，这可以帮助我解决这个问题。它可能是我的方法是错误的，它可能是一些设备问题等。谢谢
答案使用以下代码获取Path。
【从Android中的Intent中选择时，文件返回空（“”）】你也应该在新文件中传递realpath（getPath（this，data.getData（））。

/** * Get a file path from a Uri. This will get the the path for Storage Access * Framework Documents, as well as the _data field for the MediaStore and * other file-based ContentProviders. * * @param context The context. * @param uri The Uri to query. * @author paulburke */ public static String getPath(final Context context, final Uri uri) {final boolean isKitKat = Build.VERSION.SDK_INT > = Build.VERSION_CODES.KITKAT; // DocumentProvider if (isKitKat & & DocumentsContract.isDocumentUri(context, uri)) { // ExternalStorageProvider if (isExternalStorageDocument(uri)) { final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; if ("primary".equalsIgnoreCase(type)) { return Environment.getExternalStorageDirectory() + "/" + split[1]; }// TODO handle non-primary volumes } // DownloadsProvider else if (isDownloadsDocument(uri)) {final String id = DocumentsContract.getDocumentId(uri); final Uri contentUri = ContentUris.withAppendedId( Uri.parse("content://downloads/public_downloads"), Long.valueOf(id)); return getDataColumn(context, contentUri, null, null); } // MediaProvider else if (isMediaDocument(uri)) { final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; Uri contentUri = null; if ("image".equals(type)) { contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; } else if ("video".equals(type)) { contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI; } else if ("audio".equals(type)) { contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; }final String selection = "_id=?"; final String[] selectionArgs = new String[] { split[1] }; return getDataColumn(context, contentUri, selection, selectionArgs); } } // MediaStore (and general) else if ("content".equalsIgnoreCase(uri.getScheme())) { return getDataColumn(context, uri, null, null); } // File else if ("file".equalsIgnoreCase(uri.getScheme())) { return uri.getPath(); }return null; }/** * Get the value of the data column for this Uri. This is useful for * MediaStore Uris, and other file-based ContentProviders. * * @param context The context. * @param uri The Uri to query. * @param selection (Optional) Filter used in the query. * @param selectionArgs (Optional) Selection arguments used in the query. * @return The value of the _data column, which is typically a file path. */ public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {Cursor cursor = null; final String column = "_data"; final String[] projection = { column }; try { cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null); if (cursor != null & & cursor.moveToFirst()) { final int column_index = cursor.getColumnIndexOrThrow(column); return cursor.getString(column_index); } } finally { if (cursor != null) cursor.close(); } return null; }/** * @param uri The Uri to check. * @return Whether the Uri authority is ExternalStorageProvider. */ public static boolean isExternalStorageDocument(Uri uri) { return "com.android.externalstorage.documents".equals(uri.getAuthority()); }/** * @param uri The Uri to check. * @return Whether the Uri authority is DownloadsProvider. */ public static boolean isDownloadsDocument(Uri uri) { return "com.android.providers.downloads.documents".equals(uri.getAuthority()); }/** * @param uri The Uri to check. * @return Whether the Uri authority is MediaProvider. */ public static boolean isMediaDocument(Uri uri) { return "com.android.providers.media.documents".equals(uri.getAuthority()); }