Question

当我从文件浏览器打开视频文件时，如何从Uri获取文件路径。

Uri主机为“内容”，“ _ data”返回null。

我想在同一目录中获取其他视频，因此我必须获取文件路径。如果还有其他方法可以在没有文件路径的情况下获取同一目录中的视频，那么它也对我有用。非常感谢您的任何想法和解决方案。

Answer 1

活动代码：

Uri muri;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
    muri = getUriForFile("your activity", BuildConfig.APPLICATION_ID + ".provider", "file path");
} else {
    muri = Uri.fromFile("file path");
}

Answer 2

尝试此代码。它也适用于我在奥利奥（Oreo）。

/**
 * Method for return file path of Gallery image/ Document / Video / Audio
 *
 * @param context - context of the application or class
 * @param uri - uri to get the path
 * @return          - path of the selected image file from gallery
 */
public static String getPath(final Context context, final Uri uri)
{
    // check here to KITKAT or new version
    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];
            }
        }
        // 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 the remote address
        if (isGooglePhotosUri(uri))
            return uri.getLastPathSegment();

        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.
 */
private 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 index = cursor.getColumnIndexOrThrow(column);
            return cursor.getString(index);
        }
    }
    finally
    {
        if (cursor != null)
            cursor.close();
    }

    return null;
}

/**
 * @param uri      - The Uri to check.
 * @return         - Whether the Uri authority is ExternalStorageProvider.
 */
private 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.
 */
private 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.
 */
private static boolean isMediaDocument(Uri uri)
{
    return "com.android.providers.media.documents".equals(uri.getAuthority());
}

/**
 * @param uri       - The Uri to check.
 * @return          - Whether the Uri authority is Google Photos.
 */
private static boolean isGooglePhotosUri(Uri uri)
{
    return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}

此代码需要READ_EXTERNAL_STORAGE权限：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

应该在运行时向用户请求此权限，因为这是危险的权限。

如何从Android N中的URI获取文件路径

2 个答案: