Android目录下读取不到视频位置信息

1.在DCIM目录下创建子目录
2.存放已经写入经纬度信息的视频
3.读取不到经纬度信息（仅在该目录下）
4. android中是否有类似linux下文件权限的机制呢？或者其他排查方向。

仅在该目录下，那就是说放入其他目录中能读取到。是不是Android系统对Dcim目录中文件做什么限制了，可以从这个点排查下

安卓10（Android10\API29）保存图片到相册DCIM/Camera - 简书 大家都知道Android10最大的变化可能就是Scoped Storage（分区存储）。对于把图片保存到相册的应用，影响就大了，因为这个功能在Android10的手机上就会出... https://www.jianshu.com/p/cd9e58d1f8b9

直接上代码

@SuppressLint("NewApi")
public class UriUtils {
    
    /** 
     * 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. 
     */  
    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());  
    }  
 
}

获取视频位置信息的方法

public static String getVideoLocationInfo(String path) {
    MediaMetadataRetriever metadataRetriever = new MediaMetadataRetriever();
    try {
        metadataRetriever.setDataSource(path);
    } catch (Exception e) {
        e.printStackTrace();
        return "";
    }
    return metadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_LOCATION);
}

参考链接：https://blog.csdn.net/sinat_29255093/article/details/105935220

如有问题及时沟通

位置信息是以何种方式写入的呢？