Develop Reference

Adding songs to a playlist in Android Q (API29) and above throws a SecurityException

Because of the Android Privacy Changes in Android Q (API29) it's not possible to add songs to a Playlist and it throws this error message when adding a track.
java.lang.SecurityException: com.mp3player.mp3player has no access to content://media/external_primary/audio/media/117
I know that we can this catch this as a RecoverableSecurityException and grant permission for each file individually.
But this is really a hassle and i'm wondering if there is another way.
I already found a post from User #Theo with the same exact problem but without any answers.
Code for adding songs to a playlist
public void addToPlayList(Context c, long songID, long playListID, String playlistName) {
Uri playListUri = MediaStore.Audio.Playlists.Members.getContentUri("external", playListID);
String[] columns = {
MediaStore.Audio.Playlists.Members.AUDIO_ID,
MediaStore.Audio.Playlists.Members.PLAY_ORDER,
};
ContentResolver resolver = c.getContentResolver();
Cursor cursor = resolver.query(playListUri, columns, null, null, null);
int playOrder = 0;
if (cursor != null) {
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
playOrder = cursor.getInt(0) + 1;
}
cursor.close();
ContentValues contentValues = new ContentValues();
contentValues.put(MediaStore.Audio.Playlists.Members.AUDIO_ID, songID);
contentValues.put(MediaStore.Audio.Playlists.Members.PLAY_ORDER, playOrder);
resolver.insert(playListUri, contentValues);
resolver.notifyChange(Uri.parse("content://media"), null);
}
EDIT
Looks like the thrown Exception is not an instance of RecoverableSecurityException so how do we get access to that content?

you can use playListUri.getpath() and solve it.

IllegalArgumentException: Invalid column DISTINCT bucket_display_name

I'm retrieving list of distinct folders list having video files with number of videos in each folder, and this is working fine in devices having Android P and below, but when I run on devices having Android Q the app crashes.
How can I make it work for devices running Android Q
java.lang.IllegalArgumentException: Invalid column DISTINCT
bucket_display_name
Logcat:
java.lang.IllegalArgumentException: Invalid column DISTINCT bucket_display_name
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:170)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:140)
at android.content.ContentProviderProxy.query(ContentProviderNative.java:423)
at android.content.ContentResolver.query(ContentResolver.java:944)
at android.content.ContentResolver.query(ContentResolver.java:880)
at android.content.ContentResolver.query(ContentResolver.java:836)
at com.aisar.mediaplayer.fragments.VideoFolderFragment$MediaQuery.getAllVideo(VideoFolderFragment.java:364)
at com.aisar.mediaplayer.fragments.VideoFolderFragment$VideosLoader.loadVideos(VideoFolderFragment.java:434)
at com.aisar.mediaplayer.fragments.VideoFolderFragment$VideosLoader.access$1100(VideoFolderFragment.java:413)
at com.aisar.mediaplayer.fragments.VideoFolderFragment$5.run(VideoFolderFragment.java:189)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:289)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:919)
My Code:
public class MediaQuery {
private Context context;
private int count = 0;
private Cursor cursor;
List<ModelVideoFolder> videoItems;
public MediaQuery(Context context) {
this.context = context;
}
public List<ModelVideoFolder> getAllVideo(String query) {
String selection = null;
String[] projection = {
"DISTINCT " + MediaStore.Video.Media.BUCKET_DISPLAY_NAME,
MediaStore.Video.Media.BUCKET_ID
};
cursor = context.getContentResolver().query(
MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
projection,
selection,
null,
query);
videoItems = new ArrayList<>();
ModelVideoFolder videoItem;
while (cursor.moveToNext()) {
videoItem = new ModelVideoFolder(
"" + cursor.getString(1),
"" + cursor.getString(0),
"",
"",
"" + getVideosCount(cursor.getString(1))
);
videoItems.add(videoItem);
}
return videoItems;
}
public int getVideosCount(String BUCKET_ID) {
int count = 0;
String selection = null;
String[] projection = {
MediaStore.Video.Media.BUCKET_ID,
};
Cursor cursor = getActivity().getContentResolver().query(
MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
projection,
selection,
null,
null);
while (cursor.moveToNext()) {
if (BUCKET_ID.equals(cursor.getString(0))) {
//add only those videos that are in selected/chosen folder
count++;
}
}
return count;
}
}

This is due to the restrictions in Android Q.
In Android Q the projection must contain only valid column names without additional statements. Is not possible anymore to embed any type of SQL statement in the projection.
So, projections such as "DISTINCT " + YourColumName, or even trying to make a column alias such as "ExistingColumnName AS AnotherName" will always fail.
The workaround is to perform multiple queries (cursors) to get your required metrics, and construct with the results a CursorWrapper or MatrixCursor.
See the next issue link, where is stated this behavior as expected, since is part of the improved storage security model in Q:
https://issuetracker.google.com/issues/130965914
For your specific problem, a solution could be as next:
First query for a cursor to obtain the list of the BUCKET_ID values where all the videos are located. In the selection you can filter to target only video files by using MediaStore.Files.FileColumns.MEDIA_TYPE = MediaStore.Files.FileColumns.MEDIA_TYPE_VIDEO
With the retrieved cursor, iterate all the BUCKET_ID values to perform individual queries per bucket and retrieve the video records, from which you can resolve the count. While iterating keep track of each BUCKET_ID and skip any already queried. And don't forget to also perform the same MEDIA_TYPE filter selection, to avoid querying none-video files that may reside in the same bucket.
Try the next snippet based in your question code, I haven't test it but you may get an idea about how to proceed:
public static class MediaQuery
{
#NonNull
public static HashMap<String, ModelVideoFolder> get(#NonNull final Context context)
{
final HashMap<String, ModelVideoFolder> output = new HashMap<>();
final Uri contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
final String[] projection = {MediaStore.Video.Media.BUCKET_DISPLAY_NAME,
MediaStore.Video.Media.BUCKET_ID};
try (final Cursor cursor = context.getContentResolver().query(contentUri,
projection, null, null, null))
{
if ((cursor != null) && (cursor.moveToFirst() == true))
{
final int columnBucketName = cursor.getColumnIndexOrThrow(MediaStore.Video.Media.BUCKET_DISPLAY_NAME);
final int columnBucketId = cursor.getColumnIndexOrThrow(MediaStore.Video.Media.BUCKET_ID);
do
{
final String bucketName = cursor.getString(columnBucketName);
final String bucketId = cursor.getString(columnBucketId);
if (output.containsKey(bucketId) == false)
{
final int count = MediaQuery.getCount(context, contentUri, bucketId);
final ModelVideoFolder item = new ModelVideoFolder(
bucketName, bucketId, null, null, count);
output.put(bucketId, item);
}
} while (cursor.moveToNext());
}
}
return output;
}
private static int getCount(#NonNull final Context context, #NonNull final Uri contentUri,
#NonNull final String bucketId)
{
try (final Cursor cursor = context.getContentResolver().query(contentUri,
null, MediaStore.Video.Media.BUCKET_ID + "=?", new String[]{bucketId}, null))
{
return ((cursor == null) || (cursor.moveToFirst() == false)) ? 0 : cursor.getCount();
}
}
}

The DISTINCT keyword actually belongs to the SELECT statement, not to a column. For example SELECT DISTINCT Country, Name FROM CountriesTable. Therefore adding DISTINCT to a column projection is a hack which randomly worked in the previous Android versions and probably stopped working in Android 10 due to some changes. Since the ContentResolver doesn't allow raw queries, you just have to filter unique folders inside your code, e. g. by using a HashSet.

I was facing the same problem. DISTINCT keyword doesn't work in Android 10, use hashset for distinct.

Hashmap to link albumid with album name?

I'm trying to display the album names and album artwork from the songs on my device.
I tried using a comparator to sort the album names, but when i sort the album names the artwork doesn't match the album name.
How can i link the albumid with the matching artwork?
I use picasso to display the album art and.
I get the album art from MediaStore.Audio.Media.ALBUM_ID;
Then i tried using a hashmap to link albumid with album name.
But im getting this error;
E/Couldn't execute task: java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.database.Cursor.moveToFirst()' on a null object reference
// Creating the map "Album IDs" -> "Album Names"
albumIdToAlbumNameMap = new HashMap<>();
//This is what we'll ask of the albums
String[] albumColumns = {
SONG_ALBUMID,
SONG_ALBUM,
};
// Querying the album database
cursor = resolver.query(musicUri, albumColumns, null, null, null);
// Iterating through the results and filling the map.
for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext())
albumIdToAlbumNameMap.put(cursor.getString(0), cursor.getString(1));
cursor.close();
// Map Song IDs to Album IDs
songIdToAlbumIdMap = new HashMap<>();
// For each album, we'll query the databases
for (String albumID : albumIdToAlbumNameMap.keySet()) {
Uri uri = MediaStore.Audio.Albums.getContentUri(albumID);
cursor = resolver.query(uri, new String[] { SONG_ID }, null, null, null);
// Iterating through the results, populating the map
for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
long currentSongID = cursor.getLong(cursor.getColumnIndex(SONG_ID));
songIdToAlbumIdMap.put(Long.toString(currentSongID), albumID);
}
cursor.close();
}
final String musicsOnly = MediaStore.Audio.Media.IS_MUSIC + "=1";
// Actually querying the system
cursor = resolver.query(musicUri, columns, musicsOnly, null, null);
if (cursor != null && cursor.moveToFirst())
{
// NOTE: I tried to use MediaMetadataRetriever, but it was too slow.
// Even with 10 songs, it took like 13 seconds,
do {
// Creating a song from the values on the row
QuerySongs song = new QuerySongs(cursor.getInt(cursor.getColumnIndex(SONG_ID)),
cursor.getString(cursor.getColumnIndex(SONG_FILEPATH)));
song.setTitle (cursor.getString(cursor.getColumnIndex(SONG_TITLE)));
song.setArtist (cursor.getString(cursor.getColumnIndex(SONG_ARTIST)));
song.setAlbumID (cursor.getInt(cursor.getColumnIndexOrThrow(SONG_ALBUMID)));
// Using the previously created genre maps
// to fill the current song genre.
String currentGenreID = songIdToGenreIdMap.get(Long.toString(song.getId()));
String currentGenreName = genreIdToGenreNameMap.get(currentGenreID);
String currentAlbumID = songIdToAlbumIdMap.get(Long.toString(song.getId()));
String currentAlbumName = albumIdToAlbumNameMap.get(currentAlbumID);
song.setGenre(currentGenreName);
song.setAlbum(currentAlbumName);
// Adding the song to the global list
songs.add(song);
}
while (cursor.moveToNext());
}
else
{
// What do I do if I can't find any songs?
}
cursor.close();
Here does the error occur
// Iterating through the results, populating the map
for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
long currentSongID = cursor.getLong(cursor.getColumnIndex(SONG_ID));
songIdToAlbumIdMap.put(Long.toString(currentSongID), albumID);
}

Seems like you need to fix your query input to avoid null in cursor.

Android: I have a list of contact names, how to get their corresponding emails and pohone numbers?

I have an activity that has a listview which displays all contacts with multi-selection enabled. I have also a filter to filter the display result.
After struggling with this problem for 3 days, I finally could produce a list of all display names selected by the user.
My question now is how to get the corresponding email and phone number for each display name in my list?
Update:
I found a solution..
public String getNumber(String name,Context context){
String number="";
Uri uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
String[] projection = new String[] {ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
ContactsContract.CommonDataKinds.Phone.NUMBER};
Cursor people = context.getContentResolver().query(uri, projection, null, null, null);
int indexName = people.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME);
int indexNumber = people.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);
people.moveToFirst();
do {
String Name = people.getString(indexName);
String Number = people.getString(indexNumber);
if(Name.equalsIgnoreCase(name)){return Number.replace("-", "");}
// Do work...
} while (people.moveToNext());
if(!number.equalsIgnoreCase("")){return number.replace("-", "");}
else return number;
}
public String getEmail(String name,Context context){
String email="";
Uri uri = ContactsContract.CommonDataKinds.Email.CONTENT_URI;
String[] projection = new String[] {ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
ContactsContract.CommonDataKinds.Email.DATA};
Cursor people = context.getContentResolver().query(uri, projection, null, null, null);
int indexName = people.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME);
int indexNumber = people.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA);
people.moveToFirst();
do {
String Name = people.getString(indexName);
String mail = people.getString(indexNumber);
if(Name.equalsIgnoreCase(name)){return mail;}
// Do work...
} while (people.moveToNext());
if(!email.equalsIgnoreCase("")){return email;}
else return email;
}
Got it from there:
Android get contact number using name

Getting ArrayList with SQLOpenHelper not working

I have a problem with my SQLiteOpenHelper class.
I have a database with printer manufacturers and details of any kind of printer.
I try to get all manufacturer from my database with this code and returning them in a arraylist.
// Read database for All printer manufacturers and return a list
public ArrayList<String> getPrManufacturer(){
ArrayList<String> manufacturerList = new ArrayList<String>();
SQLiteDatabase db = getReadableDatabase();
Cursor cursor = db.query(CoDeskContract.Printer.TABLE_NAME,
printerManuProjection, null, null, null, null, null,null);
// If cursor is not null and manufacturer List
// does not contains Manufacturer in the list then add it!
if ((cursor != null) && (cursor.getCount()>0)){
cursor.moveToFirst();
do {
String cursorManufacturer = cursor.getString(0);
//Checking for manufacturer in the list
for(String manufacturerInList:manufacturerList){
if (!manufacturerInList.equals(cursorManufacturer))
manufacturerList.add(cursorManufacturer);
}
}while(cursor.moveToNext());
}
// Return list of manufacturers from database
return manufacturerList;
}
I want every manufacturer to be once in a list.
Somehow i cant to get it to work.
Im still a newbie.
Thanks for any Help.

You can also use the distinct keyword in SQLite (http://www.sqlite.org/lang_select.html). Use SQLiteDatabase.rawQuery(String query, String[] args) for that.
db.rawQuery("SELECT DISTINCT name FROM " + CoDeskContract.Printer.TABLE_NAME,null);

There are two issues:
In the beginning, when your list manufacturerInList is empty then it will not go inside for(String manufacturerInList:manufacturerList){ loop and hence it will never add any entry in the list.
Once you fix your problem 1, still it will not work as if (!manufacturerInList.equals(cursorManufacturer)) checks against each entry in the list and adds the non matching entry in the list possibly multiple times.
To fix the issue, you have two options.
Option1: Use contains as:
if (!manufacturerList.contains(cursorManufacturer)) {
manufacturerList.add(cursorManufacturer);
}
Option2: Use a matchFound boolean flag as:
String cursorManufacturer = cursor.getString(0);
boolean matchFound = false;
//Checking for manufacturer in the list
for(String manufacturerInList:manufacturerList){
if (manufacturerInList.equals(cursorManufacturer)){
matchFound = true;
break;
}
}
if(!matchFound){ // <- doesn't exit in the list
manufacturerList.add(cursorManufacturer);
}

Use ArrayList.contains(Object elem) to check if item is exist in ArrayList or not Change your code as:
// does not contains Manufacturer in the list then add it!
if ((cursor != null) && (cursor.getCount()>0)){
cursor.moveToFirst();
do {
String cursorManufacturer = cursor.getString(0);
//Checking for manufacturer in the list
if (!manufacturerList.contains(cursorManufacturer)) {
manufacturerList.add(cursorManufacturer);
} else {
System.out.println("cursorManufacturernot found");
}
}while(cursor.moveToNext());
}