B4A Library [Lib] MediaBrowser

Informatix · Jun 29, 2012

Hello,

This library lists the media content (audio, image and video) of the MediaStore (a database containing meta data for all available media on both internal and external storage devices). It includes an audio player and a media scanner (to scan the new media and add them to the MediaStore).

I added new functions to the library esAudioMediaBrowser provided by Lagore, improved a bit the existing ones, and extended the stuff to images and videos.
The demo (a media gallery) needs the libs Reflection & StringUtils. It displays only files stored on your external SD card (but the lib can handle internal files).

This lib does not work with Android versions < Gingerbread (2.3).

List of properties and methods:

GetAudioFieldByID (External As Boolean, ID As Long, Field As String) As String
Returns a field from the MediaStore about the specified audio file.
Examples of field: FIELD_COMPOSER, FIELD_DATE_MODIFIED, FIELD_MIME_TYPE, FIELD_SIZE...
GetAudioFileInfo (Path As String, File As String) As Map
Returns a Map containing info from the MediaStore about an audio file.
The fields that are returned are:
"ID"
"Title"
"Album"
"Artist"
"Track"
"Year"
"Location"
"DisplayName"
"Duration" (in ms)
GetAudioFileInfoByID (External As Boolean, ID As Long) As Map
Returns a Map containing info from the MediaStore about an audio file.
The fields that are returned are:
"ID"
"Title"
"Album"
"Artist"
"Track"
"Year"
"Location"
"DisplayName"
"Duration" (in ms)
GetExifAttribute (Location As String, Attribute As String) As String
Returns the requested attribute from the Exif data of the specified image.
Location = complete path name for the file.
The complete list of attributes can be found here: https://developer.android.com/reference/android/media/ExifInterface
GetExifLatLong (Location As String, LatLong As Float()) As Boolean
Stores the latitude and longitude value of the specified image in a float array. Returns False if these Exif data are not available.
Location = complete path name for the file.
GetExtImageFileInfo (Location As String) As Map
Returns a Map containing info from the MediaStore about an external image file.
Location = complete path name for the file.
The fields that are returned are:
"ID"
"Location"
"DisplayName"
"DateTaken" (in ticks from 1970)
"Height" (with Android 3.0+)
"Width" (with Android 3.0+)
"Size" (in bytes)
GetExtVideoFileInfo (Location As String) As Map
Returns a Map containing info from the MediaStore about an external video file.
Location = complete path name for the file.
The fields that are returned are:
"ID"
"Location"
"DisplayName"
"DateTaken" (in ticks from 1970)
"Resolution" (can be Null for some files)
"Size" (in bytes)
GetImageDimensions (Location As String) As Map
Returns a map containing width and height of the specified file.
Location = complete path name for the file.
GetImageFieldByID (External As Boolean, ID As Long, Field As String) As String
Returns a field from the MediaStore about the specified image file.
Examples of field: FIELD_DATE_MODIFIED, FIELD_MIME_TYPE, FIELD_ORIENTATION...
GetImageFileInfoByID (External As Boolean, ID As Long) As Map
Returns a Map containing info from the MediaStore about an image file.
The fields that are returned are:
"ID"
"Location"
"DisplayName"
"DateTaken" (in ticks from 1970)
"Height" (with Android 3.0+)
"Width" (with Android 3.0+)
"Size" (in bytes)
GetImgThumbnailByID (ID As Long, Mini As Boolean) As android.graphics.Bitmap
Returns the micro thumbnail (96x96) or mini thumbnail (512x384) of an image file (it is generated if it doesn't exist).
GetMediaAudioList (External As Boolean, SortCol As String) As Map
Returns a Map containing a list of all Audio files in the MediaStore which can be sorted.
The allowed fields for sorting are:
Null (= FIELD_ID)
FIELD_ALBUM
FIELD_ARTIST
FIELD_COMPOSER
FIELD_DATA (location)
FIELD_DATE_ADDED
FIELD_DATE_MODIFIED
FIELD_DISPLAY_NAME
FIELD_DURATION
FIELD_MIME_TYPE
FIELD_SIZE
FIELD_TITLE
FIELD_TRACK
FIELD_YEAR
The fields that are returned are:
"ID"
"Title"
"Album"
"Artist"
"Track"
"Year"
"Location"
"DisplayName"
"Duration" (in ms)
GetMediaImageList (External As Boolean, SortCol As String) As Map
Returns a Map containing a list of all Image files in the MediaStore which can be sorted.
The allowed fields for sorting are:
Null (= FIELD_ID)
FIELD_DATA (location)
FIELD_DATE_ADDED
FIELD_DATE_MODIFIED
FIELD_DATE_TAKEN
FIELD_DISPLAY_NAME
FIELD_HEIGHT
FIELD_MIME_TYPE
FIELD_ORIENTATION
FIELD_SIZE
FIELD_TITLE
FIELD_WIDTH
The fields that are returned are:
"ID"
"Location"
"DisplayName"
"DateTaken" (in ticks from 1970)
"Height" (with Android 3.0+)
"Width" (with Android 3.0+)
"Size" (in bytes)
GetMediaVideoList (External As Boolean, SortCol As String) As Map
Returns a Map containing a list of all Video files in the MediaStore which can be sorted.
The allowed fields for sorting are:
Null (= FIELD_ID)
FIELD_DATA (location)
FIELD_DATE_ADDED
FIELD_DATE_MODIFIED
FIELD_DATE_TAKEN
FIELD_DISPLAY_NAME
FIELD_MIME_TYPE
FIELD_RESOLUTION
FIELD_SIZE
FIELD_TITLE
The fields that are returned are:
"ID"
"Location"
"DisplayName"
"DateTaken" (in ticks from 1970)
"Resolution" (can be Null for some files)
"Size" (in bytes)
GetVideoFieldByID (External As Boolean, ID As Long, Field As String) As String
Returns a field from the MediaStore about the specified video file.
Examples of field: FIELD_DATE_ADDED, FIELD_DATE_MODIFIED, FIELD_MIME_TYPE...
GetVideoFileInfoByID (External As Boolean, ID As Long) As Map
Returns a Map containing info from the MediaStore about a video file.
The fields that are returned are:
"ID"
"Location"
"DisplayName"
"DateTaken" (in ticks from 1970)
"Resolution" (can be Null for some files)
"Size" (in bytes)
GetVideoThumbnailByID (ID As Long, Mini As Boolean) As android.graphics.Bitmap
Returns the micro thumbnail (96x96) or mini thumbnail (512x384) of a video file (it is generated if it doesn't exist).
There's a known bug on some Android versions with micro thumbnails:
If the micro thumbnail can't be generated (e.g. video file format not recognized), the result is either null or a random thumbnail. Thus, for video files, it is strongly recommended to check if the mini thumbnail is initialized before trying to get the micro thumbnail.
Initialize (EventName As String)
MediaAudioPlay (External As Boolean, ID As Int)
Plays an audio file.
Raises the "MediaCompleted" event when the file end is reached.
MediaIsLooping As Boolean
Checks whether the player is looping or non-looping.
MediaIsPlaying As Boolean
MediaLength As Int
Returns the duration in ms.
MediaPause
MediaPosition As Int
Gets the current playback position.
MediaResume
MediaSeek (position As Int)
Seeks to specified time position (in ms).
Raises the event "SeekCompleted" when the position change has been completed.
MediaSetLooping (Looping As Boolean)
Sets the player to be looping or non-looping.
MediaSetVolume (leftVolume As Float, rightVolume As Float)
Sets the volume on this player (and this player only).
Note that the passed volume values are raw scalars. UI controls should be scaled logarithmically.
This function must be called AFTER MediaAudioPlay.
MediaStop
Stops the playback and releases the allocated resources.
ScanNewMedia (Paths As String())
Requests the media scanner to scan the given files and add them to the MediaStore.
Raises the "ScanCompleted" event after each file is scanned.

Warning:
There's a known bug on some Android versions with micro thumbnails:
If the micro thumbnail can't be generated (e.g. video file format not recognized), the result is either null or a random thumbnail. Thus, for video files, it is strongly recommended to check if the mini thumbnail is initialized before trying to get the micro thumbnail.

v1.2:
I fixed two bugs.

v1.21:
I removed the excessive log entries.
I removed all the Try/Catch that silently trapped errors.

v1.3:
This version requires Java 7 and B4A v3.82+.
I added 3 functions:
- GetImageFileInfoByID(External As Boolean, ID As Long) As Map;
- GetVideoFileInfoByID(External As Boolean, ID As Long) As Map;
- ScanNewMedia(Paths() As String).
I updated the demo so it works with recent Android versions.

v1.31:
I fixed a mistake in two functions introduced in v1.3.

v1.4:
I fixed an issue with API 30;
I added five functions: GetAudioFieldByID, GetImageFieldByID, GetVideoFieldByID, GetExifAttribute and GetExifLatLong;
I added a few FIELD constants;
I updated the demo to display the following fields: composer, orientation, latitude and longitude.

Enjoy,
Fred

hvkaniti · Aug 19, 2012

Thank you sir. Could you suggest me if you have any websites or online documentation in your mind as a reference? That helps me a lot.

Informatix · Aug 20, 2012

hvkaniti said:
Thank you sir. Could you suggest me if you have any websites or online documentation in your mind as a reference? That helps me a lot.

If I had to do it, I think the two Wikipedia links should be enough, alongside with the XverhelstX's work (I suppose he can provide help).

hvkaniti · Aug 20, 2012

Thank you very much for your guidance Sir. I am working hard to learn this subject and come up with a library.

lorebarita · Sep 14, 2012

Getting a list of videos from a specific folder

Hi...I am developing an application and i want to get a list of videos from a specific folder in the SDcard. Am using the MediaBrowser library but am not able to acccomplish that...please help :sign0085:...

Informatix · Sep 14, 2012

lorebarita said:
Hi...I am developing an application and i want to get a list of videos from a specific folder in the SDcard. Am using the MediaBrowser library but am not able to acccomplish that...please help :sign0085:...

Get the video list as I do in the demo and filter the list to keep only the files located in the specific folder. You can filter with a condition like:

B4X:

Dim Location as String
Location = m.Get("Location" & i)
if Location.StartsWith(folder_path) then
...

lorebarita · Sep 14, 2012

Thanks Informatix...it has worked :sign0098:

stefanoa · Oct 7, 2012

hi,
some news about a new release of mediabrowser library that implement other ID3 tags?
At moment i use mediabrowser for my app, but for every song i have to read ID3 tags (genres, etc.) with ID3 class , but ID3 class is very slow...

B4X:

MB.Initialize("MB")
Dim m As Map
m = MB.GetMediaAudioList(True, "artist COLLATE UNICODE, title COLLATE UNICODE" )
....
For i = 0 To (m.Size / 9) - 1
       xLocation=GetParentPath(m.Get("Location" & i))
       xSongfilename=GetFileName(m.Get("Location" & i))

       ID3.Initialize(xLocation, xSongfilename)   '<<<< VERY SLOW
       If ID3.Exists = True Then 
           GenreName=ID3.Genre
       End If
       list1.Add(GenreName)
next
.......

thanks

Informatix · Oct 7, 2012

stefanoa said:
hi,
some news about a new release of mediabrowser library that implement other ID3 tags?
At moment i use mediabrowser for my app, but for every song i have to read ID3 tags (genres, etc.) with ID3 class , but ID3 class is very slow...

I'm very busy currently and most of my free classes and libraries are on pause. But expect something before the end of this month.

Informatix · Oct 20, 2012

Finally, no version this month. Mainly because the audio genre is not stored in the MediaStore. I won't release a new version just for the composer field (very rarely used in MP3 tags).

@Stefanoa
Your only way currently to get the missing fields is to use the ID3 class.

Yeshua · Oct 25, 2012

copy mp3 files with specific title

Hi, maybe you can help me.

I have hundreds of MP3 files in "DirAssets" folder, but I want to copy only those that have the title "SUN".

I tried this way but it does not work. In this way mp3 files are copied all.
You can do this? Thank you!

B4X:

Sub Button1_Click
Dim MyList As List
Dim MyFile As String
Dim i As Short
Dim Title As ID3               :Title.Title = "SUN"
Dim FilePathSource As String        :FilePathSource=File.DirAssets
Dim FilePathDest As String          :FilePathDest=File.DirRootExternal & "/Audio"
   MyList.Initialize                   
    MyList=File.ListFiles(FilePathSource)
    For i=0 To MyList.Size-1
    MyFile=MyList.Get(i)
   If MyFile.Contains(Title)=False  Then
   Try
   File.MakeDir(File.DirRootExternal, "/Audio")
    File.Copy(FilePathSource,MyFile,FilePathDest,MyFile)
    Catch
    End Try
    End If
    Next
End Sub

ID3 (Class Module)

B4X:

Sub Class_Globals
Public Title As String
End Sub

:sign0085:

Informatix · Oct 25, 2012

Yeshua said:
Hi, maybe you can help me.

I have hundreds of MP3 files in "DirAssets" folder, but I want to copy only those that have the title "SUN".

I tried this way but it does not work. In this way mp3 files are copied all.
You can do this? Thank you!

B4X:

Sub Button1_Click Dim MyList As List Dim MyFile As String Dim i As Short Dim Title As ID3 :Title.Title = "SUN" Dim FilePathSource As String :FilePathSource=File.DirAssets Dim FilePathDest As String :FilePathDest=File.DirRootExternal & "/Audio" MyList.Initialize MyList=File.ListFiles(FilePathSource) For i=0 To MyList.Size-1 MyFile=MyList.Get(i) If MyFile.Contains(Title)=False Then Try File.MakeDir(File.DirRootExternal, "/Audio") File.Copy(FilePathSource,MyFile,FilePathDest,MyFile) Catch End Try End If Next End Sub

ID3 (Class Module)

B4X:

Sub Class_Globals Public Title As String End Sub

:sign0085:

What's the relationship with the MB library ? You should ask your question in the ID3 class thread. I don't use this class so I don't know how it works and what you can do with it. However, by reading your code, I see you do exactly the contrary of what you expect: you copy all files except those with the required title.

Yeshua · Oct 25, 2012

ok, thanks!

DavidLen · Dec 21, 2012

compile failes

Hi

I'm using b4a 2.3

I'm trying to compile the demo, and it fails on line 11: Dim MB As MediaBrowser

I have copied the MediaBrowser JAR and XML files to the 'additional libraries' folder, and it did not help, then I copied them to the root folder of the project and it still fails.

What am I doing wrong?

David L.

Informatix · Dec 21, 2012

DavidLen said:
Hi

I'm using b4a 2.3

I'm trying to compile the demo, and it fails on line 11: Dim MB As MediaBrowser

I have copied the MediaBrowser JAR and XML files to the 'additional libraries' folder, and it did not help, then I copied them to the root folder of the project and it still fails.

What am I doing wrong?

David L.

You did nothing wrong. They must be copied into the additional libraries folder. Did you reload the B4A example after that and check that the library is selected in your libs tab ?

DavidLen · Dec 21, 2012

Informatix said:
You did nothing wrong. They must be copied into the additional libraries folder. Did you reload the B4A example after that and check that the library is selected in your libs tab ?

Thank you, that was the missing part, I appreciate the help.

David L.

Dave O · Feb 13, 2013

Another very useful library, thanks!

I just used it to fetch random images from the device's mediastore.

I did notice that I occasionally got NumberFormatExceptions when reading the width using map.get ("expected double, got NULL"). I don't know if that's a bug or (more likely) some bad meta-data stored for the image.

BTW, I'm trying to pull photos that match the current orientation of the device (i.e. portrait pictures when in portrait mode). I don't think I can determine this from the dimensions of the photo. Is there any way to do this, either through meta-data or (I doubt) programmatically?

Thanks again for the great library!

Informatix · Feb 17, 2013

Dave O said:
I did notice that I occasionally got NumberFormatExceptions when reading the width using map.get ("expected double, got NULL"). I don't know if that's a bug or (more likely) some bad meta-data stored for the image.

Width and Height are not reliable. They are null with pre-Honeycomb OS versions. Use the GetImageDimensions function instead.
You have to read the Exif data of a jpeg to know its right orientation. There's a library available for B4A (JpegUtils).

enrico · Apr 5, 2013

I think this lib can't get files from a website. Is there a solution ?

Informatix · Apr 5, 2013

enrico said:
I think this lib can't get files from a website. Is there a solution ?

Yes, it's not a download library.

I just realized that the post #1 does not explain what the library does. Fixed.

Mrjoey · Feb 27, 2014

hello mr informatix , glad to use ur great library , its really fast , i have some suggestion if u have time for updates :
it seems ur using the native mediaplayer class , i've done my own wrapper for this class and it succeeded to load the cover bitmap of the mp3 file by using :

B4X:

@ShortName("MetaData")
public static class MetaD {
     MediaMetadataRetriever Meta = new MediaMetadataRetriever();
         public void LoadFile(String file){
            Meta.setDataSource(file);
           }
public byte[] Picture(){
             return Meta.getEmbeddedPicture();
         }[CODE]
but my wrapper is pretty slow while retreiving informations i dont know why.
i suggest u to include this line cz i need to display covers in the list.
i also suggest to make a sub for path , to make an option wish folder to search ,and thank u so mush for ur efforts .

B4A Library [Lib] MediaBrowser

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