Is there a way to define a min and max value for EditText in Android

Question

I want to define a min and max value for an EditText    For example  if any person tries to enter a month value in it  the value must be between 1-12   I can do it by using TextWatcher but I want to know if there is any other way to do it in layout file or elsewhere   Edit  I don t want to limit character count  I want to limit the value  For example  if I limit month EditText w characters when I enter 12 it will accept it but if I enter 22 it mustn t accept it while I am entering

User · Answer

I made a simpler way to set a min max to an Edittext  I use arithmetic keypad and I work with this method     private int limit EditText x int z int limin int limax        if  x getText   toString    null    x getText   toString   length    0           x setText Integer toString limin            return z 0            else          z   Integer parseInt x getText   toString              if z  lt limin    z gt limax                if z lt 10                    x setText Integer toString limin                    return  z 0                             else                  x setText Integer toString limax                    return z limax                                     else             return z   Integer parseInt x getText   toString                The method accepts all of your values but if a value of users in not adhere to your limits it will be set automatically to the min max limit   For ex  limit limin 10  limax  80 if  the user sets 8  automatically 10 is saved to a variable and EditText is set to 10

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still has some problem but Here you can use min  max at any range  positive or negative      in filter calss   Override  public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart  int dend            try                  Remove the string out of destination that is to be replaced             int input              String newVal   dest toString     source toString                if  newVal length      1  amp  amp  newVal charAt 0      -                     input   min    allow                           else                   newVal   dest toString   substring 0  dstart    dest toString   substring dend  dest toString   length                        Add the new string in                 newVal   newVal substring 0  dstart    source toString     newVal substring dstart  newVal length                     input   Integer parseInt newVal                                int input   Integer parseInt dest toString     source toString                  if  isInRange min  max  input                   return null            catch  NumberFormatException nfe                      return              also the filler must set as below  in the edit createview    to allow enter number and backspace  et setFilters new InputFilter   new InputFilterMinMax min  gt   10     0    String valueOf min   max  gt -10   String valueOf max    0            and at same time must check range in the TextWatcher   et addTextChangedListener new  TextWatcher             Override       public void afterTextChanged  Editable editable                   String tmpstr   et getText   toString             if   tmpstr isEmpty    amp  amp   tmpstr equals  -                    int datavalue   Integer parseInt tmpstr                if   datavalue  gt   min    datavalue  lt   max                      accept data

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I found my own answer  It is very late now but I want to share it with you  I implement this interface   import android text TextWatcher    public abstract class MinMaxTextWatcher implements TextWatcher       int min  max      public MinMaxTextWatcher int min  int max            super            this min   min          this max   max             And then implement it in this way inside your activity   private void limitEditText final EditText ed  int min  int max        ed addTextChangedListener new MinMaxTextWatcher min  max             Override         public void beforeTextChanged CharSequence s  int start  int count  int after                         Override         public void onTextChanged CharSequence s  int start  int before  int count                         Override         public void afterTextChanged Editable s                String str   s toString                int n   0              try                   n   Integer parseInt str                   if n  lt  min                        ed setText min                       Toast makeText getApplicationContext     Minimum allowed is     min  Toast LENGTH SHORT  show                                      else if n  gt  max                        ed setText      max                       Toast makeText getApplicationContext     Maximum allowed is     max  Toast LENGTH SHORT  show                                                catch NumberFormatException nfe                    ed setText      min                   Toast makeText getApplicationContext     Bad format for number     max  Toast LENGTH SHORT  show                                        This is a very simple answer  if any better please tell me

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Of what i ve seen of  Patrik s solution and  Zac s addition  the code provided still has a big problem    If min  3 then it s impossible to type any number starting with 1 or 2  ex  15  23  If min gt  10 then it s impossible to type anything as every number will have to start with 1 2 3     In my understanding we cannot achieve the min-max limitation of an EditText s value with simple use of the class InputFilterMinMax  at least not for the min Value  because when user is typing a positive number  the value goes growing and we can easily perform an on-the-fly test to check if it s reached the limit or went outside the range and block entries that do not comply  Testing the min value is a different story as we cannot be sure if the user has finished typing or not and therefore cannot decide if we should block or not   It s not exactly what OP requested but for validation purposes i ve combined in my solution an InputFilter to test max values  with an OnFocusChangeListener to re-test for min value when the EditText loses the focus assuming the user s finished typing and it s something like this    package test    import android text InputFilter   import android text Spanned   public class InputFilterMax implements InputFilter    private int max   public InputFilterMax int max        this max   max     public InputFilterMax String max        this max   Integer parseInt max       Override public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart  int dend           try           String replacement   source subSequence start  end  toString              String newVal   dest toString   substring 0  dstart    replacement  dest toString   substring dend  dest toString   length              int input   Integer parseInt newVal            if  input lt  max              return null        catch  NumberFormatException nfe           Maybe notify user that the value is not good       return           And OnFocusChangeListenerMin   package test   import android text TextUtils  import android view View  import android view View OnFocusChangeListener   public class OnFocusChangeListenerMin implements OnFocusChangeListener    private int min   public OnFocusChangeListenerMin int min        this min   min     public OnFocusChangeListenerMin String min        this min   Integer parseInt min        Override public void onFocusChange View v  boolean hasFocus        if  hasFocus            String val     EditText v  getText   toString            if  TextUtils isEmpty val                if Integer valueOf val  lt min                     Notify user that the value is not good                                      Then in Activity set the InputFilterMax and theOnFocusChangeListenerMin to EditText  note   You can 2 both min and max in onFocusChangeListener   mQteEditText setOnFocusChangeListener  new OnFocusChangeListenerMin  20    mQteEditText setFilters new InputFilter   new InputFilterMax getActivity    50

User · Answer

You can do this with an an InputFilter  Apparently ther is just this Input Filter Interface you can use  Before you do it the annoying way an create a new Class that extends Input filter  u can use this shortcut with a innerclass Interface instantiation   Therefore you just do this   EditText subTargetTime    EditText  findViewById R id my time   subTargetTime setFilters  new InputFilter                     new InputFilter                          Override                     public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart  int dend                            int t   Integer parseInt source toString                             if t  lt 8    t   8                            return t                                                            In this example I check if the value of the EditText is greater than 8  If not it shall be set to 8  So apaprently you need to com up with the min max or whatever filter logic by yourself  But at least u can write the filter logic pretty neat and short directly into the EditText   Hope this helps

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Override public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart  int dend        try           String prefix   dest toString   substring 0  dstart           String insert   source toString            String suffix   dest toString   substring dend           String input string   prefix   insert   suffix          int input   Integer parseInt input string            if  isInRange min  max  input     input string length    lt  String valueOf min  length                return null        catch  NumberFormatException nfe          return        private boolean isInRange int a  int b  int c        return b  gt  a   c  gt   a  amp  amp  c  lt   b   c  gt   b  amp  amp  c  lt   a

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this is my code max 100  min 0  xml   lt TextView                     android id    id txt Mass smallWork                      android layout width  match parent                      android layout height  wrap content                      android textColor   000                      android textSize  20sp                      android textStyle  bold    gt    java  EditText ed   findViewById R id txt Mass smallWork       ed addTextChangedListener new TextWatcher              Override         public void beforeTextChanged CharSequence charSequence  int i  int i1  int i2                          Override         public void onTextChanged CharSequence charSequence  int i  int i1  int i2                if  charSequence equals                        int massValue   Integer parseInt charSequence toString                     if  massValue  gt  10                        ed setFilters new InputFilter   new InputFilter LengthFilter 2                       else                       ed setFilters new InputFilter   new InputFilter LengthFilter 3                                                         Override         public void afterTextChanged Editable editable

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I extended  Pratik Sharmas code to use BigDecimal objects instead of ints so that it can accept larger numbers  and account for any formatting in the EditText that isn t a number  like currency formatting i e  spaces  commas and periods   EDIT  note that this implementation has 2 as the minimum significant figures set on the BigDecimal  see the MIN SIG FIG constant  as I used it for currency  so there was always 2 leading numbers before the decimal point  Alter the MIN SIG FIG constant as necessary for your own implementation    public class InputFilterMinMax implements InputFilter   private static final int MIN SIG FIG   2  private BigDecimal min  max   public InputFilterMinMax BigDecimal min  BigDecimal max        this min   min      this max   max     public InputFilterMinMax String min  String max        this min   new BigDecimal min       this max   new BigDecimal max       Override public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart          int dend        try           BigDecimal input   formatStringToBigDecimal dest toString                     source toString              if  isInRange min  max  input                  return null                  catch  NumberFormatException nfe               return        private boolean isInRange BigDecimal a  BigDecimal b  BigDecimal c        return b compareTo a   gt  0   c compareTo a   gt   0  amp  amp  c compareTo b   lt   0               c compareTo b   gt   0  amp  amp  c compareTo a   lt   0     public static BigDecimal formatStringToBigDecimal String n         Number number   null      try           number   getDefaultNumberFormat   parse n replaceAll      d                   BigDecimal parsed   new BigDecimal number doubleValue    divide new BigDecimal 100   2                  BigDecimal ROUND UNNECESSARY           return parsed        catch  ParseException e            return new BigDecimal 0            private static NumberFormat getDefaultNumberFormat         NumberFormat nf   NumberFormat getInstance Locale getDefault         nf setMinimumFractionDigits MIN SIG FIG       return nf

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please check this code       String pass   EditText getText   toString         if TextUtils isEmpty pass     pass length  lt   YOUR MIN LENGTH                  EditText setError  You must have x characters in your txt             return                continue processing    edittext setOnFocusChangeListener  new OnFocusChangeListener              Override        public void onFocusChange View v  boolean hasFocus              if hasFocus                  USE your code here        USe the below link for more details about edittext and the edittextfilteres with text watcher     http   www mobisoftinfotech com blog android android-edittext-setfilters-example-numeric-text-field-patterns-and-length-restriction

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Extension of Pratik s and Zac s answer  Zac fixed a small bug of Pratik s in his answer  But I notcied that code doesn t support negative values  it will throw a NumberFormatException  To fix that  and allow the MIN to be negative  use the following code    Add this line  In bold  between the other two lines    newVal   newVal substring 0  dstart    source toString    newVal substring dstart  newVal length      if newVal equalsIgnoreCase  -    amp  amp  min  lt  0 return null   int input   Integer parseInt newVal     public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart  int dend        try              Remove the string out of destination that is to be replaced         String newVal   dest toString   substring 0  dstart    dest toString   substring dend  dest toString   length                Add the new string in         newVal   newVal substring 0  dstart    source toString     newVal substring dstart  newVal length                   Add this line  below  to allow Negative values               if newVal equalsIgnoreCase  -    amp  amp  min  lt  0 return null          int input   Integer parseInt newVal           if  isInRange min  max  input               return null        catch  NumberFormatException nfe            nfe printStackTrace              return

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To add to Pratik s answer  here is a modified version where user can enter min 2 digits also   for example  15 to 100    import android text InputFilter   import android text Spanned   public class InputFilterMinMax implements InputFilter        private int min  max       public InputFilterMinMax int min  int max            this min   min          this max   max             public InputFilterMinMax String min  String max            this min   Integer parseInt min           this max   Integer parseInt max               Override     public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart  int dend             try               if end  1                  min Integer parseInt source toString                 int input   Integer parseInt dest toString     source toString                 if  isInRange min  max  input                   return null            catch  NumberFormatException nfe                      return                private boolean isInRange int a  int b  int c             return b  gt  a   c  gt   a  amp  amp  c  lt   b   c  gt   b  amp  amp  c  lt   a              added   if end  1                min Integer parseInt source toString       Hope this helps  kindly dont downvote without reasons

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I know there are a million answers to this already  with one accepted  However  there are numerous bugs in the accepted answer and most of the rest simply fix one  or maybe two  of them  without expanding to all possible use cases   So I basically compiled most of the bug fixes suggested in support answers as well as adding a method to allow continuous input of numbers outside of the range in the direction of 0  if the range doesn t start at 0   at least until it s certain that it can no longer be in the range  Because to be clear  this is the only time that really causes trouble with many of the other solutions   Here s the fix   public class InputFilterIntRange implements InputFilter  View OnFocusChangeListener        private final int min  max       public InputFilterIntRange int min  int max            if  min  gt  max                   Input sanitation for the filter itself             int mid   max              max   min              min   mid                    this min   min          this max   max              Override     public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart  int dend                Determine the final string that will result from the attempted input         String destString   dest toString            String inputString   destString substring 0  dstart    source toString     destString substring dstart               Don t prevent - sign from being entered first if min is negative         if  inputString equalsIgnoreCase  -    amp  amp  min  lt  0  return null           try               int input   Integer parseInt inputString               if  mightBeInRange input                   return null            catch  NumberFormatException nfe              return                 Override     public void onFocusChange View v  boolean hasFocus                Since we can t actively filter all values             ex  range 25 - gt  350  input  15  - could be working on typing  150               lock values to range after text loses focus         if   hasFocus                if  v instanceof EditText  sanitizeValues  EditText  v                        private boolean mightBeInRange int value               Quick  fail          if  value  gt   0  amp  amp  value  gt  max  return false          if  value  gt   0  amp  amp  value  gt   min  return true          if  value  lt  0  amp  amp  value  lt  min  return false          if  value  lt  0  amp  amp  value  lt   max  return true           boolean negativeInput   value  lt  0              If min and max have the same number of digits  we can actively filter         if  numberOfDigits min     numberOfDigits max                 if   negativeInput                    if  numberOfDigits value   gt   numberOfDigits min   amp  amp  value  lt  min  return false                else                   if  numberOfDigits value   gt   numberOfDigits max   amp  amp  value  gt  max  return false                                   return true             private int numberOfDigits int n            return String valueOf n  replace  -       length               private void sanitizeValues EditText valueText            try               int value   Integer parseInt valueText getText   toString                    If value is outside the range  bring it up down to the endpoint             if  value  lt  min                    value   min                  valueText setText String valueOf value                  else if  value  gt  max                    value   max                  valueText setText String valueOf value                            catch  NumberFormatException nfe                valueText setText                           Note that some input cases are impossible to handle  actively   i e   as the user is inputting it   so we must ignore them and handle them after the user is done editing the text   Here s how you might use it   EditText myEditText   findViewById R id my edit text   InputFilterIntRange rangeFilter   new InputFilterIntRange 25  350   myEditText setFilters new InputFilter   rangeFilter        Following line is only necessary if your range is like  25  350  or  -350  -25      If your range has 0 as an endpoint or allows some negative AND positive numbers      all cases will be handled pre-emptively  myEditText setOnFocusChangeListener rangeFilter     Now  when the user tries to type in a number closer to 0 than the range allows  one of two things will happen    If min and max have the same number of digits  they won t be allowed to input it at all once they get to the final digit  If a number outside of the range is left in the field when the text loses focus  it will automatically be adjusted to the closest boundary    And of course  the user will never be allowed to input a value farther from 0 than the range allows  nor is it possible for a number like that to  accidentally  be in the text field for this reason   Known Issue s     This only works if the EditText loses focus when the user is done with it     The other option is sanitizing when the user hits the  done  return key  but in many or even most cases  this causes a loss of focus anyways   However  closing the soft keyboard will not automatically un-focus the element  I m sure 99 99  of Android developers wish it would  and that focus handling on EditText elements was less of a quagmire in general   but as of yet there is no built-in functionality for it  The easiest method that I ve found to get around this  if you need to  is to extend EditText something like this   public class EditTextCloseEvent extends AppCompatEditText        public EditTextCloseEvent Context context            super context              public EditTextCloseEvent Context context  AttributeSet attrs            super context  attrs              public EditTextCloseEvent Context context  AttributeSet attrs  int defStyle            super context  attrs  defStyle               Override     public boolean onKeyPreIme int keyCode  KeyEvent event            if  event getKeyCode      KeyEvent KEYCODE BACK                for  InputFilter filter   this getFilters                      if  filter instanceof InputFilterIntRange                        InputFilterIntRange  filter  onFocusChange this  false                                   return super dispatchKeyEvent event             This will  trick  the filter into sanitizing the input even though the view hasn t actually lost focus  If the view happens to later lose focus on its own  the input sanitation will trigger again  but nothing will change since it was already fixed   Closing  Whew  That was a lot  What originally seemed like it would be a pretty trivially easy problem ended up uncovering many little ugly pieces of vanilla Android  at least in Java   And once again  you only need to add the listener and extend EditText if your range does not include 0 in some way   And realistically  if your range doesn t include 0 but starts at 1 or -1  you also won t run into problems    As a last note  this only works for ints  There is certainly a way to implement it to work with decimals  double  float   but since neither I nor the original asker have a need for that  I don t particularly want to get all that deep into it  It would be very easy to simply use the post-completion filtering along with the following lines      Quick  fail  if  value  gt   0  amp  amp  value  gt  max  return false  if  value  gt   0  amp  amp  value  gt   min  return true  if  value  lt  0  amp  amp  value  lt  min  return false  if  value  lt  0  amp  amp  value  lt   max  return true    You would only have to change from int to float  or double   allow insertion of a single    or    depending upon country    and parse as one of the decimal types instead of an int   That handles most of the work anyways  so it would work very similarly

User · Answer

Kotlin if any one needs it  Use Utilities   class InputFilterMinMax  InputFilter       private var min Int   0     private var max Int   0     constructor min Int  max Int            this min   min         this max   max           constructor min String  max String            this min   Integer parseInt min          this max   Integer parseInt max            override fun filter source CharSequence  start Int  end Int  dest  Spanned  dstart Int  dend Int   CharSequence            try                       val input   Integer parseInt dest toString     source toString                if  isInRange min  max  input                   return null                   catch  nfe NumberFormatException             return              private fun isInRange a Int  b Int  c Int  Boolean           return if  b  gt  a  c in a  b else c in b  a           Then use this from your Kotlin class  percentage edit text filters   arrayOf Utilities InputFilterMinMax 1  100     This EditText allows from 1 to 100   Then use this from your XML  android inputType  number

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If you need range with negative numbers like -90 90  you can use this solution    public class InputFilterMinMax implements InputFilter    private int min  max   public InputFilterMinMax int min  int max        this min   min      this max   max     public InputFilterMinMax String min  String max        this min   Integer parseInt min       this max   Integer parseInt max       Override public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart  int dend        try           String stringInput   dest toString     source toString            int value          if  stringInput length      1  amp  amp  stringInput charAt 0      -                 value   -1            else               value   Integer parseInt stringInput                     if  isInRange min  max  value               return null        catch  NumberFormatException nfe              return        private boolean isInRange int min  int max  int value        return max  gt  min   value  gt   min  amp  amp  value  lt   max   value  gt   max  amp  amp  value  lt   min

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Here s my take on Pratik Sharma s answer for Kotlin and Double if any one needs it  class InputFilterMinMax   InputFilter    private var min  Double   MIN LIMIT private var max  Double   MIN LIMIT  constructor min  Int  max  Int        this min   min toDouble       this max   max toDouble      constructor min  String  max  String        this min   min toDouble       this max   max toDouble      constructor min  Double  max  Double        this min   min     this max   max    override fun filter      source  CharSequence      start  Int      end  Int      dest  Spanned      dstart  Int      dend  Int    CharSequence        try           val input    dest toString     source toString    toDouble           if  isInRange min  max  input               return null       catch  nfe  NumberFormatException            Timber e nfe             return       private fun isInRange a  Double  b  Double  c  Double   Boolean       return if  b  gt  a  c in a  b else c in b  a

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If you are only concerned about max limit then just add below line in   android maxLength  10     If you need to add min limit then you can do like this way in this case min limit is 7  user is restricted to enter character between min and max limit  in between 8 and 10    public final static boolean isValidCellPhone String number           if  number length    lt  8    number length    gt 10                 return false            else               return android util Patterns PHONE matcher number  matches                      If you also need to restrict user to enter 01 at start then modify if condition like this way   if    number startsWith  01       number length    lt  8    number length    gt 10                 At the end call method like         else if    Helper isValidMobilePhone textMobileNo                             Helper setEditTextError etMobileNo  Invalid Mobile Number

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Pratik Sharma  For support negative numbers  add the following code within the filter method   package ir aboy electronicarsenal   import android text InputFilter  import android text Spanned   public class InputFilterMinMax implements InputFilter      private int min  max    int input     InputFilterMinMax int min  int max        this min   min      this max   max         public InputFilterMinMax String min  String max        this min   Integer parseInt min       this max   Integer parseInt max           Override   public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart  int dend        try          if   dest toString     source toString    equals  -              source    -1                  input   Integer parseInt dest toString     source toString           if  isInRange min  max  input           return null         catch  NumberFormatException ignored              return            private boolean isInRange int a  int b  int c        return b  gt  a   c  gt   a  amp  amp  c  lt   b   c  gt   b  amp  amp  c  lt   a           Then use this from your Activity    findViewById R id myEditText  setFilters new InputFilter    new InputFilterMinMax 1  12       Set your edittext with   android inputType  number numberSigned

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There is a small error in Pratik s code   For instance  if a value is 10 and you add a 1 at the beginning to make 110  the filter function would treat the new value as 101  See below for a fix to this   Override public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart  int dend        try              Removes string that is to be replaced from destination            and adds the new string in          String newVal   dest subSequence 0  dstart                     Note that below  quot toString   quot  is the only required                    source subSequence start  end  toString                     dest subSequence dend  dest length             int input   Integer parseInt newVal           if  isInRange min  max  input               return null        catch  NumberFormatException nfe          return  quot  quot

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To define the minimum value of the EditText  I used this   if  message trim   length    gt   1  amp  amp  message trim   length    lt   12         do stuf   else        Too short or too long

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here s the way I ve used  it s working for negative number  First  create MinMaxFIlter java class with the following code    import android text InputFilter  import android text Spanned  import android util Log         Created by 21 on 4 5 2016     public class MinMaxFilter implements InputFilter    private double mIntMin  mIntMax   public MinMaxFilter double minValue  double maxValue        this mIntMin   minValue      this mIntMax   maxValue     public MinMaxFilter String minValue  String maxValue        this mIntMin   Double parseDouble minValue       this mIntMax   Double parseDouble maxValue       Override public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart  int dend        try           Boolean isNeg   false          String provi   dest toString     source toString            if  -  equals provi substring 0 1                 if provi length   gt 1                    provi   provi substring 1  provi length                     isNeg   true                            else                  if    equals source                        return null                                    return  -                                    double input   Double parseDouble provi            if isNeg  input   input    -1             if  isInRange mIntMin  mIntMax  input                 return null                  catch  Exception nfe         return        private boolean isInRange double a  double b  double c        if  c gt  a  amp  amp  c lt  b            return true            else          return false              Then  create and set your filter to your edittext like this    EditText edittext   new EditText context   editext setInputType InputType TYPE CLASS NUMBER   InputType TYPE NUMBER FLAG SIGNED   eInt setFilters new InputFilter   new MinMaxFilter min  max

User · Answer

Very simple example on Kotlin   import android text InputFilter import android text Spanned  class InputFilterRange private var range  IntRange    InputFilter        override fun filter source  CharSequence  start  Int  end  Int  dest  Spanned  dstart  Int  dend  Int    try           val input   Integer parseInt dest toString     source toString            if  range contains input   null else          catch  nfe  NumberFormatException

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I stumbled upon this problem when I was making a pet project  I ve read some of the answers here and I ve probably adopted on or two of them in my code  BAD NEWS  I managed to do this by using a very dirty way  you ll see why   There are still some bugs that I haven t bothered to address  I was writing this at like 2 am   like if the min value is 10  you won t be able to input a number to begin with  GOOD NEWS  I ve managed to get rid of the leading zeros bug mentioned by  nnyerges using solely the InputFilter down to only one 0  that is if the min value is 0  However  the limit of my implementation of the InputFilter comes when user deletes the first number s  that s followed by zero s   e g  if at first user inputs 1000 but then deletes 1  it will become 000  That s ugly  and that s where my dirty ugly use of TextChangedListener   TextWatcher comes in   I know OP already said that he can do it using TextWatcher  but whatever   Another limitation  or maybe MY limitation   using the InputFilter is when the inputType is numberDecimal  which means user can input a decimal separator  Example case  range is 0 - 100  user inputs 99 99  user then deletes the separator  we d have 9999  We don t want that  do we  I ve also made it to accommodate negative value  Some features in my code  whether you like it or not  include trimming insignificant 0s  e g  if user deletes 1 from 10032  as long as it s within the defined range  it will trim the leading 0s  so the final result will be 32  Second  when user tries to delete the negative  -  notation or the decimal separator      it will check whether the resulting number after deletion is still in range  If not  then it will revert back to last value  In other words  user isn t allowed to do that kind of removal  But  if you prefer to set the new values to either min or max values when that happens  you can do it  too  NOTE  I m too lazy to even bother with localization  so people who use comma as decimal separator will have to manually change it themselves  SECOND NOTE  The code is very messy and probably have some or a lot of redundant checks  so be aware  Also  if you have suggestion  feel free to comment  as I want to improve it  too  I may need to use it in the future  Who knows  Anyway  here it goes  import android text InputFilter  import android text Spanned  import android util Log   public class InputFilterMinMax implements InputFilter            private double min  max           public InputFilterMinMax double min  double max            this min   min          this max   max                 public InputFilterMinMax String min  String max            this min   Double parseDouble min           this max   Double parseDouble max                   Override     public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart  int dend            try               String lastVal   dest toString                String newVal   lastVal substring 0  dstart    source toString     lastVal substring dstart               String strInput   source toString                double input                   if  strInput equals  quot - quot    amp  amp   lastVal length      0    lastVal equals  quot 0 quot                       return null                else                   input   Double parseDouble newVal                                          if  isInRange min  max  input                     try                       if  lastVal equals  quot 0 quot    amp  amp  strInput equals  quot 0 quot    amp  amp   strInput equals  quot   quot                              Log d  quot Checkpoint 1 quot    quot Can t put 0 again  quot                            return  quot  quot                         else if  strInput equals  quot 0 quot                              if  dstart    0                                if  lastVal substring 0  1  equals  quot 0 quot                                      Log d  quot Checkpoint 2 quot    quot Can t put 0 again  quot                                    return  quot  quot                                 else if   lastVal substring 0  1  equals  quot   quot                                      Log d  quot Checkpoint 3 quot    quot Can t put 0 in front of them  quot                                    return  quot  quot                                                           else                               if  lastVal substring 0  1  equals  quot 0 quot    amp  amp  dstart    1                                    Log d  quot Checkpoint 4 quot    quot Can t put 0 again  quot                                    return  quot  quot                                 else if  lastVal substring 0  1  equals  quot - quot                                      if  Double parseDouble lastVal     0                                        if   lastVal contains  quot   quot                                              Log d  quot Checkpoint 5 quot    quot Can t put 0 here  quot                                            return  quot  quot                                         else                                           if  dstart  lt   lastVal indexOf  quot   quot                                                  Log d  quot Checkpoint 6 quot    quot Can t put 0 here  quot                                                return  quot  quot                                                                                                                     else                                       if  lastVal indexOf  quot 0 quot      1  amp  amp   dstart    1    dstart    2                                             Log d  quot Checkpoint 7 quot    quot Can t put 0 here  quot                                            return  quot  quot                                         else if    lastVal substring 1  2  equals  quot 0 quot    amp  amp   lastVal substring 1  2  equals  quot   quot     amp  amp  dstart    1                                            Log d  quot Checkpoint 8 quot    quot Can t put 0 here  quot                                            return  quot  quot                                                                                                                                                                                                             If last value is a negative that equals min value                         and user tries to input a decimal separator at the                        very end  ignore it  because they won t be able to                        input anything except 0 after that anyway                                              if  strInput equals  quot   quot    amp  amp  lastVal substring 0 1  equals  quot - quot                                amp  amp  Double parseDouble lastVal     min  amp  amp  dstart    lastVal length                              return  quot  quot                                           catch  Exception e                                      return null                          catch  Exception ignored                ignored printStackTrace                      return  quot  quot                  private boolean isInRange double a  double b  double c            return b  gt  a   c  gt   a  amp  amp  c  lt   b   c  gt   b  amp  amp  c  lt   a           Now  the really dirty part  import androidx appcompat app AppCompatActivity   import android os Bundle  import android text Editable  import android text InputFilter  import android text TextWatcher  import android util Log  import android widget EditText   public class MainActivity extends AppCompatActivity implements TextWatcher            private EditText editInput                      Var to store old value in case the new value is either        out of range or invalid somehow  This was because I        needed a double value for my app  which means I can        enter a dot      and that could mean trouble if I decided        to delete that dot  e g  assume the range is 0 - 100         At first I enter 99 99  the InputFilter would allow that         but what if somewhere down the line I decided to delete        the dot decimal separator for  quot fun quot          Wow  now I have 9999         Also  when I delete negative notation  it can produce        the same problem              private String oldVal           private int min  max            Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main                    editInput   findViewById R id edt input           editInput addTextChangedListener this                    min   -1600          max   1500                   editInput setFilters new InputFilter   new InputFilterMinMax min  max                     Override     public void beforeTextChanged CharSequence s  int start  int count  int after            oldVal   saveOldValue s  start                   Override     public void onTextChanged CharSequence s  int start  int before  int count                         Override     public void afterTextChanged Editable s                validateChange editInput  oldVal                  private String saveOldValue CharSequence s  int start            String oldVal   s toString            if  oldVal contains  quot   quot    amp  amp  start    oldVal indexOf  quot   quot    amp  amp  start    oldVal length   - 1                return oldVal            else if  oldVal contains  quot - quot    amp  amp  start    oldVal indexOf  quot - quot    amp  amp  start    oldVal length   - 1                return oldVal                    return null                 private void validateChange EditText editText  String oldVal            String strNewVal   editText getText   toString   trim            boolean isChanged   false           if  strNewVal indexOf  quot 0 quot      0     strNewVal indexOf  quot - quot      0  amp  amp  strNewVal indexOf  quot 0 quot      1                 if  strNewVal contains  quot   quot                      while   strNewVal indexOf  quot 0 quot      0  amp  amp  strNewVal indexOf  quot   quot      1  amp  amp  strNewVal length    gt  2                              strNewVal indexOf  quot 0 quot      1  amp  amp  strNewVal indexOf  quot   quot      2  amp  amp  strNewVal length    gt  3                         Log d  quot Trimming 0 quot    quot  quot                        strNewVal   strNewVal replaceFirst  quot 0 quot    quot  quot                        isChanged   true                                  else if   strNewVal contains  quot   quot                      while  strNewVal indexOf  quot 0 quot      0  amp  amp  strNewVal length    gt  1                        Log d  quot Trimming 0 quot    quot  quot                        strNewVal   strNewVal replaceFirst  quot 0 quot    quot  quot                        isChanged   true                                     if  Double parseDouble strNewVal   gt  max                        editText setText oldVal      Or  you can set it to max values here                      return                                                             if  strNewVal indexOf  quot   quot      0                strNewVal    quot 0 quot    strNewVal              isChanged   true                     try               double newVal   Double parseDouble strNewVal               Log d  quot NewVal   quot   String valueOf newVal                if  newVal  gt  max    newVal  lt  min                    Log d  quot Over Limit quot    quot Let s Reset quot                    editText setText oldVal      Or  you can set it to min or max values here                          catch  NumberFormatException e                e printStackTrace                       if  isChanged                editText setText strNewVal

User · Answer

First make this class    package com test   import android text InputFilter  import android text Spanned   public class InputFilterMinMax implements InputFilter        private int min  max       public InputFilterMinMax int min  int max            this min   min          this max   max             public InputFilterMinMax String min  String max            this min   Integer parseInt min           this max   Integer parseInt max               Override     public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart  int dend               try               int input   Integer parseInt dest toString     source toString                 if  isInRange min  max  input                   return null            catch  NumberFormatException nfe                   return                private boolean isInRange int a  int b  int c            return b  gt  a   c  gt   a  amp  amp  c  lt   b   c  gt   b  amp  amp  c  lt   a            Then use this from your Activity    EditText et    EditText  findViewById R id myEditText   et setFilters new InputFilter    new InputFilterMinMax  1    12        This will allow user to enter values from 1 to 12 only   EDIT    Set your edittext with android inputType  number    You can find more details at https   www techcompose com how-to-set-minimum-and-maximum-value-in-edittext-in-android-app-development    Thanks

User · Answer

Patrik   s code has a nice idea but with a lot of bugs   Zac and  Anthony B   negative numbers solutions  have solve some of them  but  Zac   s code still have 3 mayor bugs   1   If user deletes all entries in the EditText  it   s impossible to type any number again   Of course this can be controlled using a EditText changed listener on each field  but it will erase out the beauty of using a common InputFilter class for each EditText in your app   2   Has  Guernee4 says  if for example min   3  it   s impossible to type any number starting with 1   3   If for example min   0  you can type has many zeros you wish  that it   s not elegant the result  Or also  if no matter what is the min value  user can place the cursor in the left size of the first number  an place a bunch of leading zeros to the left  also not elegant   I came up whit these little changes of  Zac   s code to solve this 3 bugs  Regarding bug   3  I still haven t been able to completely remove all leading zeros at the left  It always can be one  but a 00   01  0100 etc in that case  is more elegant an valid that an 000000  001  000100  etc etc  Etc   Here is the code    Override     public CharSequence filter CharSequence source  int start  int end  Spanned dest  int dstart  int dend            try                   Using  Zac s initial solution             String lastVal   dest toString   substring 0  dstart    dest toString   substring dend               String newVal   lastVal substring 0  dstart    source toString     lastVal substring dstart               int input   Integer parseInt newVal                   To avoid deleting all numbers and avoid  Guerneen4 s case             if  input  lt  min  amp  amp  lastVal equals      return String valueOf min                   Normal min  max check             if  isInRange min  max  input                         To avoid more than two leading zeros to the left                 String lastDest   dest toString                    String checkStr   lastDest replaceFirst   0                              if  checkStr length    lt  lastDest length    return                      return null                          catch  NumberFormatException ignored             return             Have a nice day

User · Answer

There is something wrong in the accepted answer   int input   Integer parseInt dest toString     source toString       If I move cursor into middle of text  then type something  then the above statement will produce wrong result  For example  type  12  first  then type  0  between 1 and 2  then the statement mentioned above will produce  120  instead of 102  I modified this statement to statements below   String destString   dest toString      String inputString   destString substring 0  dstart    source toString     destString substring dstart     int input   Integer parseInt inputString

[android] Is there a way to define a min and max value for EditText in Android?

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