Develop Reference

Android 11 - Mediastore playlist remove multiple tracks from Playlist

On Android 11, when trying to remove multiple tracks from a Playlist, all the tracks are removed instead of just the selected ones. This used to work fine till Android 10.
However, if only 1 track is removed, no other tracks are removed. Is this a bug or an expected behavior going forward from Android 11? Is this a side-effect of scoped storage?
Tested on : Pixel 3, Android 11 Official release build
public void removeTracksFromPlaylist(long playlistId, String[] ids) {
Log.d(TAG, "removeTracksFromPlaylist() called with: playlistId = [" + playlistId + "], ids = [" + Arrays.toString(ids) + "]");
Uri uri = MediaStore.Audio.Playlists.Members.getContentUri(MediaStore.VOLUME_EXTERNAL, playlistId);
StringBuilder stringBuilder = new StringBuilder();
for (int index = 0; index < ids.length; index++) {
if (index > 0) {
stringBuilder.append(",");
}
stringBuilder.append("?");
}
String selection = MediaStore.Audio.Playlists.Members._ID + " IN (" + stringBuilder.toString() + ")";
contentResolver.delete(uri, selection, ids); // Returns count of all files removed from playlist
}
Edit:
Some information from source : (https://android.googlesource.com/platform/packages/providers/MediaProvider/+blame/refs/tags/android-11.0.0_r3/src/com/android/providers/media/MediaProvider.java#5610)
From the source, I see that if the count of playlist items are more than 1, the whole playlist is cleared.
try (Cursor c = qb.query(helper,
new String[] { Playlists.Members.PLAY_ORDER }, queryArgs, null)) {
if ((c.getCount() == 1) && c.moveToFirst()) { // This condition fails if more than 1 item to delete
return c.getInt(0) - 1;
} else {
return -1;
}
}
The index is used here which clears the playlist:(https://android.googlesource.com/platform/packages/providers/MediaProvider/+blame/refs/tags/android-11.0.0_r3/src/com/android/providers/media/MediaProvider.java#5566)
private int removePlaylistMembers(#NonNull Uri playlistUri, #NonNull Bundle queryArgs)
throws FallbackException {
final int index = resolvePlaylistIndex(playlistUri, queryArgs);
try {
final File playlistFile = queryForDataFile(playlistUri, null);
final Playlist playlist = new Playlist();
playlist.read(playlistFile);
final int count;
if (index == -1) {
count = playlist.asList().size();
playlist.clear(); //Clears whole playlist
} else {
count = 1;
playlist.remove(index);
}
playlist.write(playlistFile);
resolvePlaylistMembers(playlistUri);
return count;
} catch (IOException e) {
throw new FallbackException("Failed to update playlist", e,
android.os.Build.VERSION_CODES.R);
}
}

Filter number from Array of string and get the index of last two greater number in android

I have a ArrayList that has value like [Value,Sum3,121,data8input,in:21::7,7.00,9.01] and I want to extract only number as the output should be like this [3,121,8,21,7,7.00,9.01] and then have to rearrange ascending and then get the index of last two number as result will be [21,121].
My tried code below,
for (int i = 0; i < arrayString.size(); i++) {
Pattern p = Pattern.compile("-?\\d+(,\\d+)*?\\.?\\d+?");
List<String> numbers = new ArrayList<String>();
Matcher m = p.matcher(arrayString.get(i).getvalue);
numbers.addAll(m);
for (int j = 0; j < numbers.size(); j++) {
Log.d("REMEMBERFILTER", allCollection.get(i).getTextValue());
}
}
}

do something like this, though it is not exactly memory efficient as I am using another list.
ArrayList<String> tempList = new ArrayList<>();
for (int i = 0; i < yourArrayList.size(); i++) {
tempList.add(yourArrayList.get(i).replaceAll("[^0-9]", ""));
}
//Arrange in ascending order
Collections.sort(tempList);
//Also try to remove those indexes which has only letters with
tempList.removeAll(Arrays.asList("", null));
for (int i = 0; i < tempList.size(); i++) {
Log.d("+++++++++", "" + tempList.get(i));
}
//You can get the last two or any element by get method of list by //list.size()-1 and list.size()-2 so on

This is a way to do it, finalArray has the 2 numbers you want:
String[] str = new String[] {"Value", "Sum3", "121", "data8input", "in:21::7", "7.00,9.01"};
StringBuilder longStringBuilder = new StringBuilder();
for (String s : str) {
longStringBuilder.append(s).append(" ");
}
String longString = longStringBuilder.toString();
String onlyNumbers = " " + longString.replaceAll("[^0-9.]", " ") + " ";
onlyNumbers = onlyNumbers.replaceAll(" \\. ", "").trim();
while (onlyNumbers.indexOf(" ") > 0) {
onlyNumbers = onlyNumbers.replaceAll(" ", " ");
}
String[] array = onlyNumbers.split(" ");
Double[] doubleArray = new Double[array.length];
for (int i = 0; i < array.length; i++) {
try {
doubleArray[i] = Double.parseDouble(array[i]);
} catch (NumberFormatException e) {
e.printStackTrace();
doubleArray[i] = 0.0;
}
}
Arrays.sort(doubleArray);
int numbersCount = doubleArray.length;
Double[] finalArray;
if (numbersCount >= 2) {
finalArray = new Double[]{doubleArray[numbersCount - 2], doubleArray[numbersCount - 1]};
} else if (numbersCount == 1) {
finalArray = new Double[]{ doubleArray[0]};
} else {
finalArray = new Double[]{};
}
for (Double number : finalArray) {
System.out.println(number);
}

Cursor only returning one value / last value

I am really stuck as I have a cursor that retrieves values from the database but the cursor only returns the last value. I need the cursor to retrieve all values so I can display them all later on. Is there any way as I can return all the data stored through the cursor?
An Example as to whats happening. Eg Click on Button 1 and stores 1 perfectly but once I click on Button 2 and add 1. Button 1 data is not return or retrieved.
Any help would be greatly appreciated.
Execute
The first Cursor is goes through to check all the stored items.
public void exectute() {
AsyncTask.execute(new Runnable() {
#Override
public void run() {
Cursor c = TrackerDb.getStoredItems(getApplicationContext());
if (c != null) {
if (c.moveToFirst()) {
WorkoutDetails details = null;
//if (details != null) mWorkoutDetailsList.add(details);
do {
//if (details != null) mWorkoutDetailsList.add(details);
WorkoutDetails temp = getWorkoutFromCursor(c);
//if (details != null) mWorkoutDetailsList.add(details);
if (details == null) {
details = temp;
continue;
}
//if (details != null) mWorkoutDetailsList.add(details);
if (isSameDay(details.getWorkoutDate(), temp.getWorkoutDate())) {
//if (details != null) mWorkoutDetailsList.add(details);
if (DBG) Log.d(LOG_TAG, "isSameDay().. true");
//details.add(temp);
} else {
mWorkoutDetailsList.add(details);
details = temp;
}
// if (details != null) mWorkoutDetailsList.add(details);
} while (c.moveToNext());
if (details != null) mWorkoutDetailsList.add(details);
if (DBG)
Log.d(LOG_TAG, "AsyncTask: list size " + mWorkoutDetailsList.size());
runOnUiThread(new Runnable() {
#Override
public void run() {
mWorkoutsAdapter.updateList(mWorkoutDetailsList);
}
});
}
c.close();
}
}
});
}
Get Stored Items Code
This is the code which the excute class calls and where the cursor only returns one value.
public static Cursor getStoredItems(Context context) {
DBHelper dbHelper = new DBHelper(context);
SQLiteDatabase db = dbHelper.getWritableDatabase();
String[] projection = {ID, TIME, TYPE, DURATION, DATE, POINT};
String orderBy = TIME + " DESC";
Cursor cursor = db.query(TABLE_NAME, projection, null, null, null, null, orderBy);
return cursor;
}
Array
This is the array code where i want the cursor to store its values based on type.
private WorkoutDetails getWorkoutFromCursor(Cursor c) {
long time = c.getLong(c.getColumnIndex(TrackerDb.TIME));
int type = c.getInt(c.getColumnIndex(TrackerDb.TYPE));
int duration = c.getInt(c.getColumnIndex(TrackerDb.DURATION));
int point = c.getInt(c.getColumnIndex(TrackerDb.POINT));
int totalMoney = MoneyActivity.Money.values().length;
int[] points = new int[totalMoney];
int totalActivities = MeditationTrackerActivity.ACTIVITIES.values().length;
int[] durations = new int[totalActivities];
if (type < totalActivities) {
durations[type] = duration;
}
if( type == 0) {
for (int i = 0; i < totalMoney; i++) {
points[type] = point;
}
}
else if ( type == 1) {
for ( int ii = 0; ii < totalMoney; ii++) {
points[type] = point;
}
}
else if ( type == 2) {
for ( int iii = 0; iii < totalMoney; iii++) {
points[type] = point;
}
}
return new WorkoutDetails(time, durations, points);
}
Get Workout From Cursor Code
private static WorkoutDetails getWorkoutFromCursor(Cursor c) {
long time = c.getLong(c.getColumnIndex(TrackerDb.TIME));
int type = c.getInt(c.getColumnIndex(TrackerDb.TYPE));
int duration = c.getInt(c.getColumnIndex(TrackerDb.DURATION));
String date = c.getString(c.getColumnIndex(TrackerDb.DATE));
int point = c.getInt(c.getColumnIndex(TrackerDb.POINT));
int[] durations = new int[MeditationTrackerActivity.ACTIVITIES.values().length];
durations[type] = duration;
int[] points = new int[MoneyActivity.Money.values().length];
points[type] = point;
return new WorkoutDetails(time, durations, date, points);
}

regular-expressions android

i have string like these for example
309\306\308\337_338
309\306\337_338
310
311\315_316\336_337
311\315_316\336_337
311\335_336
these strings means list of page number , for example string "309\306\308\337_339" means
pages 309,306,308,337,338,339
i want to pass one of these string to function which return it as string like this
309,306,308,337,338,339
this function do that but in c# , i want to impalement in android
private static string Get_PageNumbers(string str)
{
ArrayList arrAll = new ArrayList();
MatchCollection match;
string[] excar;
string strid, firstNumber, lastlNumber;
int fn, ln;
ArrayList arrID = new ArrayList();
//***In Case The Range Number Between "_"
if (str.Contains("_"))
{
// match_reg = new Regex("(w?[\\d]+)*(_[\\d]+)");
Regex matchReg = new Regex("(w?[\\69]+_[\\d]+)*(q?[\\d]+//)*(a?[\\d]+_[\\d]+)*(y?[\\d]+)*");
match = matchReg.Matches(str);
int count = match.Count;
excar = new string[0];
for (int i = 0; i < count; i++)
{
Array.Resize(ref excar, count);
excar[i] = match[i].Groups[0].Value;
if (excar[i] != string.Empty)
arrID.Add(excar[i]);
}
//******IF Array Contains Range Of Number Like"102_110"
if (str.Contains("_"))
{
for (int i = 0; i < arrID.Count; i++)
{
strid = arrID[i].ToString();
if (arrID[i].ToString().Contains("_"))
{
int idy = strid.LastIndexOf("_");
firstNumber = strid.Substring(0, idy);
if (idy != -1)
{
lastlNumber = strid.Substring(idy + 1);
fn = int.Parse(firstNumber);
arrAll.Add(fn);
ln = int.Parse(lastlNumber);
for (int c = fn; c < ln; c++)
{
fn++;
arrAll.Add(fn);
}
}
}
else
{
arrAll.Add(arrID[i].ToString());
}
}
//******If Array Contain More Than One Number
if (arrAll.Count > 0)
{
str = "";
for (int i = 0; i < arrAll.Count; i++)
{
if (str != string.Empty)
str = str + "," + arrAll[i];
else
str = arrAll[i].ToString();
}
}
}
}
//***If string Contains between "/" only without "_"
else if (str.Contains("/") && !str.Contains("_"))
{
str = str.Replace("/", ",");
}
else if (str.Contains("\\"))
{
str = str.Replace("\\", ",");
}
return str;
}

I think this is easier to do with split function:
public static String Get_PageNumbers(String str) {// Assume str = "309\\306\\308\\337_338"
String result = "";
String[] pages = str.split("\\\\"); // now we have pages = {"309","306","308","337_338"}
for (int i = 0; i < pages.length; i++) {
String page = pages[i];
int index = page.indexOf('_');
if (index != -1) { // special case i.e. "337_338", index = 3
int start = Integer.parseInt(page.substring(0, index)); // start = 337
int end = Integer.parseInt(page.substring(index + 1)); // end = 338
for (int j = start; j <= end; j++) {
result += String.valueOf(j);
if (j != end) { // don't add ',' after last one
result += ",";
}
}
} else { // regular case i.e. "309","306","308"
result += page;
}
if (i != (pages.length-1)) { // don't add ',' after last one
result += ",";
}
}
return result; // result = "309,306,308,337,338"
}
For example this function when called as follows:
String result1 = Get_PageNumbers("309\\306\\308\\337_338");
String result2 = Get_PageNumbers("311\\315_316\\336_337");
String result3 = Get_PageNumbers("310");
Returns:
309,306,308,337,338
311,315,316,336,337
310

if i can suggest different implementation....
first, split string with "\" str.split("\\");, here you receive an array string with single number or a pattern like "num_num"
for all string founded, if string NOT contains "" char, put string in another array (othArr named), than, you split again with "" str.split("_");, now you have a 2 position array
convert that 2 strings in integer
now create a loot to min val form max val or two strings converted (and put it into othArr)
tranform othArr in a string separated with ","

Add the contents of one Cursor to another Cursor

I want to join two cursors so that the contents of the second Cursor shall also appear in first Cursor after joining.
Precisely here is my code,
public final Uri AllImage_URI_Int = MediaStore.Images.Media.INTERNAL_CONTENT_URI;
public final Uri AllAudio_URI = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
cContentList = managedQuery(AllImage_URI_Int, null, null, null, MediaStore.Images.ImageColumns.TITLE);
cList_Int = managedQuery(AllImage_URI, null, null, null, MediaStore.Images.ImageColumns.TITLE);
Should i use the CursorJoiner in this case?
I want to pass this Cursor to SimpleListAdapter? How can i join those two cursors?

Maybe you can use a MergeCursor wrapper to merge your two Cursors into a new one, and pass it to your Adapter.

well, i solved it myself and working, extendeb by AbstractCursor, heres the code,
private final int ROWCACHESIZE = 64;
private int mRowNumCache[] = new int[ROWCACHESIZE];
private int mCursorCache[] = new int[ROWCACHESIZE];
private int mCurRowNumCache[][];
private int mLastCacheHit = -1;
public SortCursor(Cursor[] cursors, String sortcolumn)
{
mCursors = cursors;
int length = mCursors.length;
mSortColumns = new int[length];
for (int i = 0 ; i < length ; i++) {
if (mCursors[i] == null) continue;
mCursors[i].moveToFirst();
// We don't catch the exception
mSortColumns[i] = mCursors[i].getColumnIndexOrThrow(sortcolumn);
}
mCursor = null;
String smallest = "";
for (int j = 0 ; j < length; j++) {
if (mCursors[j] == null || mCursors[j].isAfterLast())
continue;
String current = mCursors[j].getString(mSortColumns[j]);
if (mCursor == null || current.compareToIgnoreCase(smallest) < 0) {
smallest = current;
mCursor = mCursors[j];
}
}
for (int i = mRowNumCache.length - 1; i >= 0; i--) {
mRowNumCache[i] = -2;
}
mCurRowNumCache = new int[ROWCACHESIZE][length];
}