從文件路徑獲取MediaStore內容Uri？

Question

我有一個列出MediaStore中所有視頻的應用程序。 （我既需要內部存儲又需要外部存儲）。

基本上，我有兩個游標，它們查詢MediaStore.Video.Media.EXTERNAL_CONTENT_URI和MediaStore.Video.Media.INTERNAL_CONTENT_URI。

然后，我使用MergeCursor合並這些查詢，並使用CursorAdapter在ListView中顯示。

問題是有時我想刪除其中一個視頻，但是我需要“內容Uri”來執行此操作，因為我無法確定所選視頻的存儲方式。

我在MediaStore中擁有視頻和ID的完整文件路徑。

如何從文件路徑/ Uri獲取“內容Uri”？

Answer 1

要回答標題中的問題：

我必須從URI獲取路徑，並從我的應用程序中的路徑獲取URI。 前者：

/**
 * Gets the corresponding path to a file from the given content:// URI
 * @param selectedVideoUri The content:// URI to find the file path from
 * @param contentResolver The content resolver to use to perform the query.
 * @return the file path as a string
 */
private String getFilePathFromContentUri(Uri selectedVideoUri,
        ContentResolver contentResolver) {
    String filePath;
    String[] filePathColumn = {MediaColumns.DATA};

    Cursor cursor = contentResolver.query(selectedVideoUri, filePathColumn, null, null, null);
    cursor.moveToFirst();

    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
    filePath = cursor.getString(columnIndex);
    cursor.close();
    return filePath;
}

后者（我用於視頻，但也可以通過用MediaStore.Audio（等）替換MediaStore.Video來用於音頻或文件或其他類型的存儲內容）：

/**
 * Gets the MediaStore video ID of a given file on external storage
 * @param filePath The path (on external storage) of the file to resolve the ID of
 * @param contentResolver The content resolver to use to perform the query.
 * @return the video ID as a long
 */
private long getVideoIdFromFilePath(String filePath,
        ContentResolver contentResolver) {


    long videoId;
    Log.d(TAG,"Loading file " + filePath);

            // This returns us content://media/external/videos/media (or something like that)
            // I pass in "external" because that's the MediaStore's name for the external
            // storage on my device (the other possibility is "internal")
    Uri videosUri = MediaStore.Video.Media.getContentUri("external");

    Log.d(TAG,"videosUri = " + videosUri.toString());

    String[] projection = {MediaStore.Video.VideoColumns._ID};

    // TODO This will break if we have no matching item in the MediaStore.
    Cursor cursor = contentResolver.query(videosUri, projection, MediaStore.Video.VideoColumns.DATA + " LIKE ?", new String[] { filePath }, null);
    cursor.moveToFirst();

    int columnIndex = cursor.getColumnIndex(projection[0]);
    videoId = cursor.getLong(columnIndex);

    Log.d(TAG,"Video ID is " + videoId);
    cursor.close();
    return videoId;
}

基本上， MediaStore的DATA列（或您要查詢的子部分）存儲文件路徑，因此您可以使用該信息來查找它。

Answer 2

回答我自己的問題:)

找到一種簡單而簡單的方法來查找路徑的存儲方式：**

    if(selectedVideoPath.indexOf(Environment.getExternalStorageDirectory().getPath()) == 0)
    {
        getContentResolver().delete(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, 
                MediaStore.Video.Media._ID + "=" + videoId,
                null);
    }
    else {
        getContentResolver().delete(MediaStore.Video.Media.INTERNAL_CONTENT_URI, 
                MediaStore.Video.Media._ID + "=" + videoId,
                null);          
    }