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jEN | the java client for The Echo Nest API

 by   echonest Java Version: Current License: No License

 by   echonest Java Version: Current License: No License

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kandi X-RAY | jEN Summary

jEN is a Java library. jEN has no bugs, it has no vulnerabilities and it has low support. However jEN build file is not available. You can download it from GitHub.
jEN is an open source Java library for the Echo Nest API. With jEN you have Java access to the entire set of API methods including:. artist - search for artists by name, description, or attribute, and get back detailed information about any artist including audio, similar artists, blogs, familiarity, hotttnesss, news, reviews, urls and video. song - search songs by artist, title, description, or attribute (tempo, duration, etc) and get detailed information back about each song, such as hotttnesss, audio summary, or tracks. track - upload a track to the Echo Nest and receive summary information about the track including key, duration, mode, tempo, time signature along with detailed track info including timbre, pitch, rhythm and loudness information. playlists - create personalized playlists based on a wide range of parameters. taste profiles - provide for personalized recommendation and playlisting. This is a Java client API and assorted tools and helpers for the Echo Nest API (at developer.echonest.com). This client works with Version 4 of the Echo Nest API.
Support
Support
Quality
Quality
Security
Security
License
License
Reuse
Reuse

kandi-support Support

  • jEN has a low active ecosystem.
  • It has 68 star(s) with 46 fork(s). There are 16 watchers for this library.
  • It had no major release in the last 12 months.
  • There are 8 open issues and 3 have been closed. There are 4 open pull requests and 0 closed requests.
  • It has a neutral sentiment in the developer community.
  • The latest version of jEN is current.
jEN Support
Best in #Java
Average in #Java
jEN Support
Best in #Java
Average in #Java

quality kandi Quality

  • jEN has 0 bugs and 0 code smells.
jEN Quality
Best in #Java
Average in #Java
jEN Quality
Best in #Java
Average in #Java

securitySecurity

  • jEN has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
  • jEN code analysis shows 0 unresolved vulnerabilities.
  • There are 0 security hotspots that need review.
jEN Security
Best in #Java
Average in #Java
jEN Security
Best in #Java
Average in #Java

license License

  • jEN does not have a standard license declared.
  • Check the repository for any license declaration and review the terms closely.
  • Without a license, all rights are reserved, and you cannot use the library in your applications.
jEN License
Best in #Java
Average in #Java
jEN License
Best in #Java
Average in #Java

buildReuse

  • jEN releases are not available. You will need to build from source code and install.
  • jEN has no build file. You will be need to create the build yourself to build the component from source.
  • Installation instructions, examples and code snippets are available.
  • It has 13329 lines of code, 1140 functions and 75 files.
  • It has high code complexity. Code complexity directly impacts maintainability of the code.
jEN Reuse
Best in #Java
Average in #Java
jEN Reuse
Best in #Java
Average in #Java
Top functions reviewed by kandi - BETA

kandi has reviewed jEN and discovered the below as its top functions. This is intended to give you an instant insight into jEN implemented functionality, and help decide if they suit your requirements.

  • Searches for ECHO queries
    • Add standard commands .
      • Collapses the genres .
        • Sends a command .
          • Dumps the details of an artist .
            • Dumps this object to stdout .
              • Retrieves the next song .
                • Get overall statistics .
                  • Search one or more songs with ID space .
                    • Show all available data

                      Get all kandi verified functions for this library.

                      Get all kandi verified functions for this library.

                      jEN Key Features

                      jEN is an open source Java library for the Echo Nest API. With jEN you have Java access to the entire set of API methods including:

                      artist - search for artists by name, description, or attribute, and get back detailed information about any artist including audio, similar artists, blogs, familiarity, hotttnesss, news, reviews, urls and video.

                      song - search songs by artist, title, description, or attribute (tempo, duration, etc) and get detailed information back about each song, such as hotttnesss, audio summary, or tracks.

                      track - upload a track to the Echo Nest and receive summary information about the track including key, duration, mode, tempo, time signature along with detailed track info including timbre, pitch, rhythm and loudness information.

                      playlists - create personalized playlists based on a wide range of parameters

                      taste profiles - provide for personalized recommendation and playlisting

                      jEN Examples and Code Snippets

                      See all related Code Snippets

                      Quick Start

                      copy iconCopydownload iconDownload
                      public static void main(String[] args) throws EchoNestException {
                          EchoNestAPI echoNest = new EchoNestAPI(API_KEY);
                          List<Artist> artists = echoNest.searchArtists("Weezer");
                      
                          if (artists.size() > 0) {
                              Artist weezer = artists.get(0);
                              System.out.println("Similar artists for " + weezer.getName());
                              for (Artist simArtist : weezer.getSimilar(10)) {
                                  System.out.println("   " + simArtist.getName());
                              }
                          }
                      }
                      

                      Building the jar file

                      copy iconCopydownload iconDownload
                      % ant jar
                      

                      Running a test shell

                      copy iconCopydownload iconDownload
                      % scripts/enshell
                        Welcome to The Echo Nest API Shell
                        type 'help' 
                      
                      nest% get_similar weezer
                      
                      Similarity for Weezer
                        Rivers Cuomo
                        The Rentals
                        Fountains of Wayne
                        Jimmy Eat World
                        Phantom Planet
                        The Presidents of the United States of America
                        Cake
                        Harvey Danger
                        The All-American Rejects
                        Ben Folds Five
                        Nerf Herder
                        Motion City Soundtrack
                        New Found Glory
                        Superdrag
                        Foo Fighters
                      
                      nest% splaylist Muse
                      
                          Muse Time = Is Running Out
                          Coldplay = Viva La Vida
                          Travis = Sing
                          The Killers = Here With Me
                          The Subways = I Want To Hear What You Have Got To Say
                          Bloc Party = Banquet
                          Keane = Is It Any Wonder?
                          The Cooper Temple Clause = Talking To A Brick Wall
                          Richard Ashcroft = Check The Meaning
                          Athlete Wires = (Album Version)
                      
                      nest% 
                      

                      Why doesnt the index plus one on the first click of the Iconbutton

                      copy iconCopydownload iconDownload
                      var dropDownPickedState = calendarViewModel.dropDownMenuState.value.pickedItem
                      
                      var item by viewModel.stateValue  // is ok
                      var item = viewModel.stateValue.value // is not ok
                      
                      var dropDownPickedState = calendarViewModel.dropDownMenuState.value.pickedItem
                      
                      var item by viewModel.stateValue  // is ok
                      var item = viewModel.stateValue.value // is not ok
                      

                      Join operations in SQL

                      copy iconCopydownload iconDownload
                      select ingredient_id, ingredient_name
                      from ingredient i
                      where not exists (
                        select * from contains c 
                        where c.ingredient_id = i.ingredient_id
                      );
                      
                      SELECT 
                          ingredient.ingredient_id,
                          ingredient.ingredient_name,
                          contains.ice_cream_id
                      FROM 
                          ingredient
                      LEFT JOIN 
                          contains
                      ON 
                          ingredient.ingredient_id = contains.ingredient_id
                      WHERE 
                          contains.ice_cream_id IS NULL
                      

                      Non-anonymous named function to sort multidimensional object by SPECIFIED sub-key's value

                      copy iconCopydownload iconDownload
                      var people = {};
                      people['Zanny'] = {date: 447, last: 'Smith'};
                      people['Nancy'] = {date: 947, last: 'William'};
                      people['Jen'] = {date: 147, last: 'Roberts'};
                      console.log(Object.fromEntries(Object.entries(people).sort((a,b) => {
                          return a[1].date - b[1].date
                        })))
                      var people = {};
                      people['Zanny'] = {date: 447, last: 'Smith'};
                      people['Nancy'] = {date: 947, last: 'William'};
                      people['Jen'] = {date: 147, last: 'Roberts'};
                      console.log(Object.fromEntries(Object.entries(people).sort(([,a],[,b]) => {
                          return a.date - b.date
                        })))
                      function array_sort_by_values(o, k)
                      {
                       return Object.fromEntries(Object.entries(o).sort((a,b) => {return a[1][k] - b[1][k]}));
                      }
                      
                      people = array_sort_by_values(people, 'date');
                      console.log(people);
                      
                      array_sort_by_values(people, 'last')
                      console.log(people);
                      
                      var people = {};
                      people['Zanny'] = {date: 447, last: 'Smith'};
                      people['Nancy'] = {date: 947, last: 'William'};
                      people['Jen'] = {date: 147, last: 'Roberts'};
                      console.log(Object.fromEntries(Object.entries(people).sort((a,b) => {
                          return a[1].date - b[1].date
                        })))
                      var people = {};
                      people['Zanny'] = {date: 447, last: 'Smith'};
                      people['Nancy'] = {date: 947, last: 'William'};
                      people['Jen'] = {date: 147, last: 'Roberts'};
                      console.log(Object.fromEntries(Object.entries(people).sort(([,a],[,b]) => {
                          return a.date - b.date
                        })))
                      function array_sort_by_values(o, k)
                      {
                       return Object.fromEntries(Object.entries(o).sort((a,b) => {return a[1][k] - b[1][k]}));
                      }
                      
                      people = array_sort_by_values(people, 'date');
                      console.log(people);
                      
                      array_sort_by_values(people, 'last')
                      console.log(people);
                      
                      var people = {};
                      people['Zanny'] = {date: 447, last: 'Smith'};
                      people['Nancy'] = {date: 947, last: 'William'};
                      people['Jen'] = {date: 147, last: 'Roberts'};
                      console.log(Object.fromEntries(Object.entries(people).sort((a,b) => {
                          return a[1].date - b[1].date
                        })))
                      var people = {};
                      people['Zanny'] = {date: 447, last: 'Smith'};
                      people['Nancy'] = {date: 947, last: 'William'};
                      people['Jen'] = {date: 147, last: 'Roberts'};
                      console.log(Object.fromEntries(Object.entries(people).sort(([,a],[,b]) => {
                          return a.date - b.date
                        })))
                      function array_sort_by_values(o, k)
                      {
                       return Object.fromEntries(Object.entries(o).sort((a,b) => {return a[1][k] - b[1][k]}));
                      }
                      
                      people = array_sort_by_values(people, 'date');
                      console.log(people);
                      
                      array_sort_by_values(people, 'last')
                      console.log(people);
                      
                      var people = {};
                      people['Zanny'] = {date: 447, last: 'Smith'};
                      people['Nancy'] = {date: 947, last: 'William'};
                      people['Jen'] = {date: 147, last: 'Roberts'};
                      console.log(Object.fromEntries(Object.entries(people).sort((a,b) => {
                          return a[1].date - b[1].date
                        })))
                      var people = {};
                      people['Zanny'] = {date: 447, last: 'Smith'};
                      people['Nancy'] = {date: 947, last: 'William'};
                      people['Jen'] = {date: 147, last: 'Roberts'};
                      console.log(Object.fromEntries(Object.entries(people).sort(([,a],[,b]) => {
                          return a.date - b.date
                        })))
                      function array_sort_by_values(o, k)
                      {
                       return Object.fromEntries(Object.entries(o).sort((a,b) => {return a[1][k] - b[1][k]}));
                      }
                      
                      people = array_sort_by_values(people, 'date');
                      console.log(people);
                      
                      array_sort_by_values(people, 'last')
                      console.log(people);
                      

                      Vectorizing a Function to Replicate Rows with Pandas

                      copy iconCopydownload iconDownload
                      df = f.loc[df.index.repeat(df['Count'])].reset_index(drop=True).drop('Count', axis=1)
                      
                      >>> df
                         Name  Age Gender
                      0   Jen   25      F
                      1   Jen   25      F
                      2   Jen   25      F
                      3  Paul   30      M
                      4  Paul   30      M
                      
                      df = f.loc[df.index.repeat(df['Count'])].reset_index(drop=True).drop('Count', axis=1)
                      
                      >>> df
                         Name  Age Gender
                      0   Jen   25      F
                      1   Jen   25      F
                      2   Jen   25      F
                      3  Paul   30      M
                      4  Paul   30      M
                      

                      Replace duplicate value with the value from another column on each row where a duplicate is located

                      copy iconCopydownload iconDownload
                      >>> df.loc[df["ID"].duplicated(), "ID"] = df.loc[df["ID"].duplicated(), "ALT_ID"]
                      >>> df
                          ID   Name  ALT_ID
                      0    1   Jack     111
                      1  222  James     222
                      2    2    Joe     333
                      3    3    Jim     444
                      4  555    Jen     555
                      
                      df2 = df.assign(ID=df['ID'].where(~df.duplicated(['ID']), df['ALT_ID']))
                      >>> df2
                          ID   Name  ALT_ID
                      0    1   Jack     111
                      1  222  James     222
                      2    2    Joe     333
                      3    3    Jim     444
                      4  555    Jen     555
                      
                      mask = df.duplicated('ID')
                      df.loc[mask, 'ID'] = df.loc[mask, 'ALT_ID']
                      
                      df2 = df.assign(ID=df['ID'].where(~df.duplicated(['ID']), df['ALT_ID']))
                      >>> df2
                          ID   Name  ALT_ID
                      0    1   Jack     111
                      1  222  James     222
                      2    2    Joe     333
                      3    3    Jim     444
                      4  555    Jen     555
                      
                      mask = df.duplicated('ID')
                      df.loc[mask, 'ID'] = df.loc[mask, 'ALT_ID']
                      

                      Extract all links between ' and ' in a text file, using CLI (Linux)

                      copy iconCopydownload iconDownload
                      grep -Po "'\Khttps?://[^\s']+" file
                      
                      #!/bin/bash
                      s="Not him old music think his found enjoy merry. Listening acuteness dependent at or an. 'https://I_want_this' Apartments thoroughly unsatiable terminated sex how themselves. She are ten hours wrong walls stand early. 'https://I_want_this_too'. Domestic perceive on an ladyship extended received do. Why jennings our whatever his learning gay perceive. Is against no he without subject. Bed connection unreserved preference partiality not unaffected. Years merit trees so think in hoped we as."
                      grep -Po "'\Khttps?://[^\s']+" <<< "$s"
                      
                      https://I_want_this
                      https://I_want_this_too
                      
                      grep -Po "'\Khttps?://[^\s']+" file
                      
                      #!/bin/bash
                      s="Not him old music think his found enjoy merry. Listening acuteness dependent at or an. 'https://I_want_this' Apartments thoroughly unsatiable terminated sex how themselves. She are ten hours wrong walls stand early. 'https://I_want_this_too'. Domestic perceive on an ladyship extended received do. Why jennings our whatever his learning gay perceive. Is against no he without subject. Bed connection unreserved preference partiality not unaffected. Years merit trees so think in hoped we as."
                      grep -Po "'\Khttps?://[^\s']+" <<< "$s"
                      
                      https://I_want_this
                      https://I_want_this_too
                      
                      grep -Po "'\Khttps?://[^\s']+" file
                      
                      #!/bin/bash
                      s="Not him old music think his found enjoy merry. Listening acuteness dependent at or an. 'https://I_want_this' Apartments thoroughly unsatiable terminated sex how themselves. She are ten hours wrong walls stand early. 'https://I_want_this_too'. Domestic perceive on an ladyship extended received do. Why jennings our whatever his learning gay perceive. Is against no he without subject. Bed connection unreserved preference partiality not unaffected. Years merit trees so think in hoped we as."
                      grep -Po "'\Khttps?://[^\s']+" <<< "$s"
                      
                      https://I_want_this
                      https://I_want_this_too
                      
                      awk '
                      {
                        while(match($0,/\047https?:\/\/[^\047]*/)){
                          print substr($0,RSTART+1,RLENGTH-1)
                          $0=substr($0,RSTART+RLENGTH)
                        }
                      }
                      '  Input_file
                      

                      TypeError: Unhashable type: 'set'/'list'

                      copy iconCopydownload iconDownload
                      print("1" in ["1", "2"]) # prints True
                      
                      for keys in favorite_languages:
                          if people in favorite_languages: # your elem = poeple (which is set)
                              print(f"Thanks for taking our poll {people}")
                      
                      for person in people: # we iterate over all peoples one by one
                          if person in favorite_languages:
                              print(f"Thanks for taking our poll {person}")
                      
                      
                      print("1" in ["1", "2"]) # prints True
                      
                      for keys in favorite_languages:
                          if people in favorite_languages: # your elem = poeple (which is set)
                              print(f"Thanks for taking our poll {people}")
                      
                      for person in people: # we iterate over all peoples one by one
                          if person in favorite_languages:
                              print(f"Thanks for taking our poll {person}")
                      
                      
                      print("1" in ["1", "2"]) # prints True
                      
                      for keys in favorite_languages:
                          if people in favorite_languages: # your elem = poeple (which is set)
                              print(f"Thanks for taking our poll {people}")
                      
                      for person in people: # we iterate over all peoples one by one
                          if person in favorite_languages:
                              print(f"Thanks for taking our poll {person}")
                      
                      
                      favorite_languages = {
                          'jen': 'python',
                          'sarah': 'c',
                          'edward': 'ruby',
                          'phil':  'python'
                      }
                      people = {'ryker', 'trey', 'jen', 'edward'}
                      poll_takers = []
                      
                      for p in people:
                          for keys in favorite_languages:
                              if p in keys:
                                  poll_takers.append(p)
                                  print((f"Thanks for taking our poll {' '.join(poll_takers)}."))
                      

                      How to handle Pandas columns where elements are Lists?

                      copy iconCopydownload iconDownload
                      m = df_test['name'].isna()
                      df_test.loc[m, 'name'] = df_test.loc[mask, 'name'].fillna("['empty']").apply(eval)
                      

                      &quot;Duplicate&quot; data from query with offset condition

                      copy iconCopydownload iconDownload
                       ORDER BY `created_at` DESC, `id`
                       LIMIT 10 OFFSET 20
                      
                      SELEC * from `users` where `users`.`deleted_at` is null order by `id` desc limit 10.
                      
                      id  name    created_at
                      '201'   'Amani' '2021-12-04 23:49:56'
                      '200'   'Herman'    '2021-12-04 23:49:56'
                      '199'   'Maximo'    '2021-12-04 23:49:56'
                      
                      SELEC * from `users` where `users`.`deleted_at` is null and id < 199 order by `id` desc limit 10.
                      
                      
                      

                      What does the following mean wrt. binary representations of signed types in C language?

                      copy iconCopydownload iconDownload
                      size_t my_strlen(const char *s) {
                        const char *t = s;
                        while (*t) {
                          t++;
                        }
                        return t - s;
                      } 
                      

                      See all related Code Snippets

                      Community Discussions

                      Trending Discussions on jEN
                      • Why doesnt the index plus one on the first click of the Iconbutton
                      • Join operations in SQL
                      • Non-anonymous named function to sort multidimensional object by SPECIFIED sub-key's value
                      • Vectorizing a Function to Replicate Rows with Pandas
                      • Replace duplicate value with the value from another column on each row where a duplicate is located
                      • Extract all links between ' and ' in a text file, using CLI (Linux)
                      • TypeError: Unhashable type: 'set'/'list'
                      • How to handle Pandas columns where elements are Lists?
                      • &quot;Duplicate&quot; data from query with offset condition
                      • What does the following mean wrt. binary representations of signed types in C language?
                      Trending Discussions on jEN

                      QUESTION

                      Why doesnt the index plus one on the first click of the Iconbutton

                      Asked 2022-Apr-16 at 17:20

                      So i have made a calendar. I am now trying to make two arrow buttons jump through the months. The only problem is that everytime i click the Iconbutton the ++ doesnt do anything the first time but does something on the second... why is this can someone please help

                      package com.jens.svensson.jenson_calendar
                      
                      import android.content.res.Configuration
                      import androidx.compose.foundation.background
                      import androidx.compose.foundation.clickable
                      import androidx.compose.foundation.layout.*
                      import androidx.compose.foundation.lazy.LazyListState
                      import androidx.compose.foundation.lazy.LazyRow
                      import androidx.compose.foundation.shape.RoundedCornerShape
                      import androidx.compose.material.*
                      import androidx.compose.material.icons.Icons
                      import androidx.compose.material.icons.filled.ArrowBack
                      import androidx.compose.material.icons.filled.ArrowDropDown
                      import androidx.compose.material.icons.filled.ArrowForward
                      import androidx.compose.runtime.Composable
                      import androidx.compose.runtime.DisposableEffect
                      import androidx.compose.runtime.rememberCoroutineScope
                      import androidx.compose.ui.Alignment
                      import androidx.compose.ui.Modifier
                      import androidx.compose.ui.geometry.*
                      import androidx.compose.ui.graphics.RectangleShape
                      import androidx.compose.ui.text.TextStyle
                      import androidx.compose.ui.unit.dp
                      import androidx.compose.ui.window.Dialog
                      import androidx.compose.ui.window.DialogProperties
                      import androidx.hilt.navigation.compose.hiltViewModel
                      import com.jens.svensson.jenson_calendar.data.model.CalendarColors
                      import com.jens.svensson.jenson_calendar.ui.CalendarViewModel
                      import com.jens.svensson.jenson_calendar.ui.events.CalendarEvent
                      import kotlinx.coroutines.CoroutineScope
                      import kotlinx.coroutines.launch
                      
                      
                      @Composable
                      fun Calendar(
                          calendarViewModel: CalendarViewModel = hiltViewModel(),
                          isRoundedCorners: Boolean = false,
                          startMonth: Int,
                          calendarColor: CalendarColors,
                          textStyle: TextStyle,
                          onDissmissDialog: () -> Unit,
                          size: Configuration
                      ){
                          val calendarYears = calendarViewModel.calendarYears
                          val showMenuState = calendarViewModel.dropDownMenuState.value.showDropDown
                          var dropDownPickedState = calendarViewModel.dropDownMenuState.value.pickedItem
                          val sizeHeight = size.screenHeightDp
                          val sizeWidth = size.screenWidthDp
                          val width = sizeWidth * 0.95
                          val height = sizeHeight * 0.95
                          val coroutineScope = rememberCoroutineScope()
                      
                      
                      
                          Dialog(onDismissRequest = onDissmissDialog, properties = DialogProperties(dismissOnClickOutside = true)) {
                              Column(modifier = Modifier
                                  .size(width = width.dp, height = height.dp)
                                  .padding(15.dp)
                                  .background(
                                      calendarColor.calendarColor,
                                      shape = if (isRoundedCorners) RoundedCornerShape(10) else RectangleShape
                                  )) {
                      
                      
                                  Header(isRoundedCorners = isRoundedCorners, color = calendarColor.headerColor)
                                  Row(
                                      modifier = Modifier
                                          .fillMaxWidth(), horizontalArrangement = Arrangement.SpaceBetween
                                  ) {
                                      Box(
                                          modifier = Modifier
                                              .align(Alignment.CenterVertically)
                                              .padding(start = 22.dp)
                                      ) {
                                          Row(Modifier.clickable { calendarViewModel.onEvent(CalendarEvent.ShowDropDown(!showMenuState)) }) {
                                              Text(
                                                  text = calendarViewModel.standardMonths[calendarViewModel.dropDownMenuState.value.pickedItem],
                                                  style = MaterialTheme.typography.h6,
                                                  color = calendarColor.mainCalendarTextColor
                                              )
                                              Icon(
                                                  imageVector = Icons.Default.ArrowDropDown,
                                                  contentDescription = "Month dropdown arrow",
                                                  tint = calendarColor.mainCalendarTextColor
                                              )
                                          }
                                          DropdownMenu(
                                              expanded = showMenuState,
                                              onDismissRequest = { calendarViewModel.onEvent(CalendarEvent.ShowDropDown(!showMenuState)) }) {
                                              calendarViewModel.standardMonths.forEachIndexed { index, month ->
                                                  DropdownMenuItem(onClick = { calendarViewModel.onEvent(CalendarEvent.ClickedMenuItem(index))
                                                  }) {
                                                      Row() {
                                                          Text(text = month, style = MaterialTheme.typography.h6)
                                                      }
                                                  }
                                              }
                                          }
                                      }
                                      IconButton(modifier = Modifier.align(Alignment.CenterVertically), onClick = {}) {
                                          Icon(
                                              imageVector = Icons.Default.ArrowBack,
                                              contentDescription = "Go back one month arrow",
                                              tint = calendarColor.mainCalendarTextColor
                                          )
                                      }
                                      IconButton(modifier = Modifier.align(Alignment.CenterVertically), onClick = {
                                          calendarViewModel.onEvent(CalendarEvent.ClickedMenuItem(dropDownPickedState++))
                                      }) {
                                          Icon(
                                              imageVector = Icons.Default.ArrowForward,
                                              contentDescription = "Go forward one month arrow",
                                              tint = calendarColor.mainCalendarTextColor
                                          )
                                      }
                      
                      
                                  }
                                  Row(
                                      modifier = Modifier.fillMaxWidth(),
                                      horizontalArrangement = Arrangement.SpaceEvenly
                                  ) {
                                      calendarViewModel.datesList.forEach {
                                          Text(text = it, color = calendarColor.mainCalendarTextColor)
                                      }
                                  }
                                  LazyRow(state = calendarViewModel.listState, modifier = Modifier.fillMaxWidth()) {
                                      calendarYears.forEach {
                                          items(it.months.count()) { index ->
                                              CalendarRowItem(
                                                  modifier = Modifier.fillParentMaxWidth(),
                                                  calendarSize = it.months[index].ammountOfDays,
                                                  initWeekday = it.months[index].startDayOfMonth.ordinal,
                                                  textColor = MaterialTheme.colors.secondaryVariant,
                                                  clickedColor = MaterialTheme.colors.primary,
                                                  textStyle = MaterialTheme.typography.body1
                                              )
                                          }
                                      }
                      
                                  }
                      
                      
                      
                                  DisposableEffect(Unit) {
                                      coroutineScope.launch {
                                          calendarViewModel.listState.scrollToItem(calendarViewModel.currentMonth)
                      
                      
                                      }
                                      onDispose {  }
                                  }
                                  
                                  
                                  CalendarButtonSection()
                      
                      
                      
                      
                      
                      
                              }
                          }
                      
                      }
                      

                      calendarViewModel

                      package com.jens.svensson.jenson_calendar.ui
                      
                      
                      import androidx.compose.foundation.lazy.LazyListState
                      import androidx.compose.runtime.State
                      import androidx.compose.runtime.mutableStateOf
                      import androidx.lifecycle.ViewModel
                      import com.jens.svensson.jenson_calendar.data.model.CalendarMonth
                      import com.jens.svensson.jenson_calendar.data.model.CalendarYear
                      import com.jens.svensson.jenson_calendar.data.model.YearMonths
                      import com.jens.svensson.jenson_calendar.domain.repository.CalendarInterface
                      import com.jens.svensson.jenson_calendar.ui.events.CalendarEvent
                      import com.jens.svensson.jenson_calendar.ui.state.DropDownMenuState
                      import dagger.hilt.android.lifecycle.HiltViewModel
                      import java.time.Month
                      import java.util.*
                      import javax.inject.Inject
                      
                      @HiltViewModel
                      class CalendarViewModel @Inject constructor(private val repository: CalendarInterface): ViewModel() {
                          val datesList: List<String> = repository.getShortenedWeekDays()
                          val calendarYears: List<CalendarYear> = repository.createAndReturnYears()
                          val standardMonths: List<String> = repository.getStandardMonths()
                          val listState = LazyListState()
                          val currentMonth: Int = Calendar.getInstance().get(Calendar.MONTH)
                      
                      
                      
                          private val _dropdownMenuState = mutableStateOf(DropDownMenuState())
                          val dropDownMenuState: State<DropDownMenuState> = _dropdownMenuState
                      
                          init {
                              _dropdownMenuState.value = dropDownMenuState.value.copy(pickedItem = currentMonth)
                          }
                      
                      
                          fun onEvent(event: CalendarEvent){
                              when(event){
                                  is CalendarEvent.ShowDropDown -> _dropdownMenuState.value = dropDownMenuState.value.copy(showDropDown =  event.value)
                                  is CalendarEvent.ClickedMenuItem -> {
                                      _dropdownMenuState.value = _dropdownMenuState.value.copy(pickedItem = event.value)
                                  }
                      
                              }
                          }
                      
                      
                      
                      
                      
                      
                      
                          fun getCalendarMonths(yearIndex: Int): List<CalendarMonth>{
                              return calendarYears[yearIndex].months
                          }
                      }
                      

                      New viewmodel

                      package com.jens.svensson.jenson_calendar.ui
                      
                      
                      import androidx.compose.foundation.lazy.LazyListState
                      import androidx.compose.runtime.State
                      import androidx.compose.runtime.mutableStateOf
                      import androidx.lifecycle.ViewModel
                      import com.jens.svensson.jenson_calendar.data.model.CalendarMonth
                      import com.jens.svensson.jenson_calendar.data.model.CalendarYear
                      import com.jens.svensson.jenson_calendar.data.model.YearMonths
                      import com.jens.svensson.jenson_calendar.domain.repository.CalendarInterface
                      import com.jens.svensson.jenson_calendar.ui.events.CalendarEvent
                      import com.jens.svensson.jenson_calendar.ui.state.DropDownMenuState
                      import dagger.hilt.android.lifecycle.HiltViewModel
                      import java.time.Month
                      import java.util.*
                      import javax.inject.Inject
                      
                      @HiltViewModel
                      class CalendarViewModel @Inject constructor(private val repository: CalendarInterface): ViewModel() {
                          val datesList: List<String> = repository.getShortenedWeekDays()
                          val calendarYears: List<CalendarYear> = repository.createAndReturnYears()
                          val standardMonths: List<String> = repository.getStandardMonths()
                          val listState = LazyListState()
                          val currentMonth: Int = Calendar.getInstance().get(Calendar.MONTH)
                          private var datePickedState: Int = 0
                      
                      
                          private val _dropdownMenuState = mutableStateOf(DropDownMenuState())
                          val dropDownMenuState: State<DropDownMenuState> = _dropdownMenuState
                      
                          init {
                              _dropdownMenuState.value = dropDownMenuState.value.copy(pickedItem = currentMonth)
                          }
                      
                      
                          fun onEvent(event: CalendarEvent){
                              when(event){
                                  is CalendarEvent.ShowDropDown -> _dropdownMenuState.value = dropDownMenuState.value.copy(showDropDown =  event.value)
                                  is CalendarEvent.ClickedMenuItem -> {
                                      _dropdownMenuState.value = _dropdownMenuState.value.copy(pickedItem = event.value)
                                  }
                                  is CalendarEvent.NextMonth -> nextMonth()
                                  is CalendarEvent.PreviousMonth -> previousMonth()
                      
                              }
                          }
                      
                          fun nextMonth(){
                              datePickedState = _dropdownMenuState.value.pickedItem
                              if(datePickedState == 11){
                                  datePickedState = 0
                              }else{
                                  _dropdownMenuState.value = _dropdownMenuState.value.copy(pickedItem = ++datePickedState)
                              }
                      
                      
                          }
                          fun previousMonth(){
                              datePickedState = _dropdownMenuState.value.pickedItem
                              if(datePickedState == 0){
                                  datePickedState == 11
                              }else{
                                  _dropdownMenuState.value = dropDownMenuState.value.copy(pickedItem = --datePickedState)
                              }
                      
                      
                          }
                      
                      
                      
                      
                      
                          fun getCalendarMonths(yearIndex: Int): List<CalendarMonth>{
                              return calendarYears[yearIndex].months
                          }
                      }
                      

                      The buttons

                      IconButton(modifier = Modifier.align(Alignment.CenterVertically), onClick = {calendarViewModel.onEvent(CalendarEvent.PreviousMonth)}) {
                          Icon(
                              imageVector = Icons.Default.ArrowBack,
                              contentDescription = "Go back one month arrow",
                              tint = calendarColor.mainCalendarTextColor
                          )
                      }
                      IconButton(modifier = Modifier.align(Alignment.CenterVertically), onClick = {
                          calendarViewModel.onEvent(CalendarEvent.NextMonth)
                      }) {
                          Icon(
                              imageVector = Icons.Default.ArrowForward,
                              contentDescription = "Go forward one month arrow",
                              tint = calendarColor.mainCalendarTextColor
                          )
                      }
                      

                      ANSWER

                      Answered 2022-Apr-16 at 15:10

                      One problem is that i++ passes the current i value to the calculation before increasing, so you pass the same old value to onEvent. You can find more details in this answer - it's about C, but inc/dec operators work the same in all languages they exists. You could've used ++i, which will increase the value before using it in the calculations.

                      But here comes the second problem. This line:

                      var dropDownPickedState = calendarViewModel.dropDownMenuState.value.pickedItem
                      

                      creates a local variable, and those are not saved between recompositions. So the first time you click, you're increasing the local value, but pass the old value to onEvent, which doesn't cause recomposition.

                      The second time you click - previously increased value gets passed to your view model, which triggers recomposition, and resets your dropDownPickedState.

                      To prevent such errors don't use var in Compose views, unless you're using it with state delegation, e.g.:

                      var item by viewModel.stateValue  // is ok
                      var item = viewModel.stateValue.value // is not ok
                      

                      Source https://stackoverflow.com/questions/71894649

                      Community Discussions, Code Snippets contain sources that include Stack Exchange Network

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