如何通过文件路径从MediaStore获取Uri？

Question

在我的程序中,我想通过它的文件路径保存选定的铃声,然后将其设置为当前的铃声.

我从RingtonePreference获得了铃声uri,并从MediaStore数据库获取它的文件路径.

例如

Uri - content://media/internal/audio/media/29
Path - /system/media/audio/notifications/Ascend.mp3

现在,如何从我保存的文件路径中获取铃声Uri？

由于铃声已存在于MediaStore中,我尝试了以下功能,但它无法正常工作.

uriRingtone = MediaStore.Audio.Media.getContentUriForPath(szRingtonePath);

Uri与我从RingtonePreference得到的那个不一样.

uriRingtone - content://media/internal/audio/media

如何查询MediaStore以获得我需要的Uri？

ps我没有直接存储铃声Uri的原因是我发现同一铃声的Uri有时会在某些设备中发生变化.

Answer 1

通过了解歌曲的标题,您可以恢复存储在RingtonePreference中的铃声URI的方式(据我所知).然后你可以通过使用游标来获取存储的铃声_id来查询它,你可以用它构建一个URI:

String ringtoneTitle = "<The desired ringtone title>";
Uri parcialUri = Uri.parse("content://media/external/audio/media"); // also can be "content://media/internal/audio/media", depends on your needs
Uri finalSuccessfulUri;

RingtoneManager rm = new RingtoneManager(getApplicationContext()); 
Cursor cursor = rm.getCursor();
cursor.moveToFirst();

while(!cursor.isAfterLast()) {
    if(ringtoneTitle.compareToIgnoreCase(cursor.getString(cursor.getColumnIndex(MediaStore.MediaColumns.TITLE))) == 0) {
    int ringtoneID = cursor.getInt(cursor.getColumnIndex(MediaStore.MediaColumns._ID));
        finalSuccessfulUri = Uri.withAppendedPath(parcialUri, "" + ringtoneID );
        break;
    }
    cursor.moveToNext();
}

其中finalSuccessful uri是uri指向RingtonePreference中的铃声.

Answer 2

您还可以对 MediaStore 中的任何内容以更通用的方式执行此操作。我必须从 URI 中获取路径并从路径中获取 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（我为视频做的，但也可以用于音频或文件或其他类型的存储内容，通过将 MediaStore.Audio（等）替换为 MediaStore.Video：

/**
 * 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，DATA列MediaStore（或您查询的任何子部分）存储文件路径，因此您可以使用该信息进行查找。

Answer 3

以下代码将返回音频,视频和图像的内容Uri的绝对路径.

public static String getRealPathFromURI(Context context, Uri contentUri) {
        Cursor cursor = context.getContentResolver().query(contentUri, null, null, null, null);

        int idx;
        if(contentUri.getPath().startsWith("/external/image") || contentUri.getPath().startsWith("/internal/image")) {
            idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
        }
        else if(contentUri.getPath().startsWith("/external/video") || contentUri.getPath().startsWith("/internal/video")) {
            idx = cursor.getColumnIndex(MediaStore.Video.VideoColumns.DATA);
        }
        else if(contentUri.getPath().startsWith("/external/audio") || contentUri.getPath().startsWith("/internal/audio")) {
            idx = cursor.getColumnIndex(MediaStore.Audio.AudioColumns.DATA);
        }
        else{
            return contentUri.getPath();
        }
        if(cursor != null && cursor.moveToFirst()) {
            return cursor.getString(idx);
        }
        return null;
    }