Question

我想获取Android Q中文件位置的Uri。我正在使用以下代码，但是，Android Studio声明已弃用。如何正确获取文件的Uri？

val file = File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES + "/meter"), "lalaland.jpg")

val uri = Uri.fromFile(file)

Answer 1

此功能将根据给定的displayName 返回文件的Uri。您可以将其更新为 MediaStore.Images ....

之类的Image。

public static Uri getUriFromDisplayName(Context context, String displayName) {

    String[] projection;
    projection = new String[]{MediaStore.Files.FileColumns._ID};

    // TODO This will break if we have no matching item in the MediaStore.
    Cursor cursor = context.getContentResolver().query(extUri, projection,
            MediaStore.Files.FileColumns.DISPLAY_NAME + " LIKE ?", new String[]{displayName}, null);
    assert cursor != null;
    cursor.moveToFirst();

    if (cursor.getCount() > 0) {
        int columnIndex = cursor.getColumnIndex(projection[0]);
        long fileId = cursor.getLong(columnIndex);

        cursor.close();
        return Uri.parse(extUri.toString() + "/" + fileId);
    } else {
        return null;
    }

}

Answer 2

不建议使用方法Environment#getExternalStoragePublicDirectory(String)，以改善用户隐私。如果您引用了Context（例如ctx），则可以执行以下操作：

val file = File(ctx.getExternalFilesDir(Environment.DIRECTORY_PICTURES),
                "meter/lalaland.jpg")

val uri = Uri.fromFile(file)

请咨询the docs，以详细了解getExternalFilesDir()的工作方式。

Answer 3

用于来自共享存储的android Q Access媒体文件为了提供更丰富的用户体验，许多应用程序允许用户贡献和访问外部存储卷上可用的媒体。该框架为媒体集合（称为媒体商店）提供了优化的索引，该索引可以更轻松地检索和更新这些媒体文件。作用域存储android scoped storage android add an item to collection

public static Uri getImageContentUri(Context context, File imageFile) {
    String filePath = imageFile.getAbsolutePath();
    Cursor cursor = context.getContentResolver().query(
            MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
            new String[]{MediaStore.Images.Media._ID},
            MediaStore.Images.Media.DATA + "=? ",
            new String[]{filePath}, null);
    if (cursor != null && cursor.moveToFirst()) {
        int id = cursor.getInt(cursor.getColumnIndex(MediaStore.MediaColumns._ID));
        cursor.close();
        return Uri.withAppendedPath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "" + id);
    } else {
        if (imageFile.exists()) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
                ContentResolver resolver = context.getContentResolver();
                Uri picCollection = MediaStore.Images.Media
                        .getContentUri(MediaStore.VOLUME_EXTERNAL_PRIMARY);
                ContentValues picDetail = new ContentValues();
                picDetail.put(MediaStore.Images.Media.DISPLAY_NAME, imageFile.getName());
                picDetail.put(MediaStore.Images.Media.MIME_TYPE, "image/jpg");
                picDetail.put(MediaStore.Images.Media.RELATIVE_PATH,"DCIM/" + UUID.randomUUID().toString());
                picDetail.put(MediaStore.Images.Media.IS_PENDING,1);
                Uri finaluri = resolver.insert(picCollection, picDetail);
                picDetail.clear();
                picDetail.put(MediaStore.Images.Media.IS_PENDING, 0);
                resolver.update(picCollection, picDetail, null, null);
                return finaluri;
            }else {
                ContentValues values = new ContentValues();
                values.put(MediaStore.Images.Media.DATA, filePath);
                return context.getContentResolver().insert(
                        MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
            }

        } else {
            return null;
        }
    }
}

如何在Android Q中获取Image Uri？

3 个答案: