{"id":1614,"date":"2012-06-04T05:27:52","date_gmt":"2012-06-04T05:27:52","guid":{"rendered":"http:\/\/www.mobisoftinfotech.com\/blog\/?p=1614"},"modified":"2024-11-18T16:06:55","modified_gmt":"2024-11-18T10:36:55","slug":"android-edittext-setfilters-example-numeric-text-field-patterns-and-length-restriction","status":"publish","type":"post","link":"https:\/\/mobisoftinfotech.com\/resources\/blog\/android\/android-edittext-setfilters-example-numeric-text-field-patterns-and-length-restriction","title":{"rendered":"Android EditText : setFilters Example : Numeric Text field Patterns and Length Restriction."},"content":{"rendered":"

Sometimes requirement comes in a way when one needs to restrict characters to be entered in Edit Text. Scenario can be \u201cusername should be greater than 6 characters\u201d, \u201caccepts only decimal number with 2 digits after fraction\u201d, etc.<\/p>\n

In this regard, EditText’ setFilters works at its best. EditText’s setFilters method can be used while playing with length of characters to be entered or entering data in particular pattern in EditText. To freeze such requirement with quickest solution, I have written Custom EditText Locker. One can use this class file along with two lines of code in Main activity to suffice the purpose. If needed more patterns of accepting data in EditText can be added to same class file to make it more generic. For example to make custom locker I have added two EditTexts one which accepts any character with limit of 4 and another EditText which accepts decimal number with only two digits after fraction.<\/p>\n

Code for EditTextLocker.java<\/b><\/h2>\n
package<\/span> com<\/span>.<\/span>edittextlocker<\/span>;<\/span>\n\nimport<\/span> android<\/span>.<\/span>text<\/span>.<\/span>Editable<\/span>;<\/span>\nimport<\/span> android<\/span>.<\/span>text<\/span>.<\/span>InputFilter<\/span>;<\/span>\nimport<\/span> android<\/span>.<\/span>text<\/span>.<\/span>Spanned<\/span>;<\/span>\nimport<\/span> android<\/span>.<\/span>text<\/span>.<\/span>TextWatcher<\/span>;<\/span>\nimport<\/span> android<\/span>.<\/span>view<\/span>.<\/span>KeyEvent<\/span>;<\/span>\nimport<\/span> android<\/span>.<\/span>view<\/span>.<\/span>View<\/span>;<\/span>\nimport<\/span> android<\/span>.<\/span>view<\/span>.<\/span>View<\/span>.<\/span>OnKeyListener<\/span>;<\/span>\nimport<\/span> android<\/span>.<\/span>widget<\/span>.<\/span>EditText<\/span>;<\/span>\n\npublic<\/span> class<\/span> EditTextLocker {<\/span>\n\n    private<\/span> EditText editText;<\/span>\n\n    private<\/span> int<\/span> charactersLimit;<\/span>\n\n    private<\/span> int<\/span> fractionLimit;<\/span>\n\n    public<\/span> EditTextLocker(<\/span>EditText editText)<\/span> {<\/span>\n\n        this<\/span>.<\/span>editText =<\/span> editText;<\/span>\n\n        editText.<\/span>setOnKeyListener(<\/span>editTextOnKeyListener)<\/span>;<\/span>\n    }<\/span>\n\n    private<\/span> OnKeyListener editTextOnKeyListener =<\/span> new<\/span> OnKeyListener(<\/span>)<\/span> {<\/span>\n\n        @<\/span>Override\n        public<\/span> boolean<\/span> onKey(<\/span>View v,<\/span> int<\/span> keyCode,<\/span> KeyEvent<\/span> event)<\/span> {<\/span>\n\n            if<\/span> (<\/span>keyCode =<\/span>=<\/span> KeyEvent<\/span>.<\/span>KEYCODE_DEL)<\/span> {<\/span>\n                startStopEditing(<\/span>false<\/span>)<\/span>;<\/span>\n            }<\/span>\n\n            return<\/span> false<\/span>;<\/span>\n        }<\/span>\n    }<\/span>;<\/span>\n\n    private<\/span> TextWatcher editTextWatcherForCharacterLimits =<\/span> new<\/span> TextWatcher(<\/span>)<\/span> {<\/span>\n\n        @<\/span>Override\n        public<\/span> void<\/span> onTextChanged(<\/span>CharSequence s,<\/span> int<\/span> start,<\/span> int<\/span> before,<\/span> int<\/span> count)<\/span> {<\/span>\n\n            if<\/span> (<\/span>!<\/span>editText.<\/span>getText(<\/span>)<\/span>.<\/span>toString(<\/span>)<\/span>.<\/span>equalsIgnoreCase(<\/span>\"\"<\/span>)<\/span>)<\/span> {<\/span>\n\n                int<\/span> editTextLength =<\/span> editText.<\/span>getText(<\/span>)<\/span>.<\/span>toString(<\/span>)<\/span>.<\/span>trim(<\/span>)<\/span>.<\/span>length(<\/span>)<\/span>;<\/span>\n\n                if<\/span> (<\/span>editTextLength ><\/span>=<\/span> charactersLimit)<\/span> {<\/span>\n\n                    startStopEditing(<\/span>true<\/span>)<\/span>;<\/span>\n\n                }<\/span>\n\n            }<\/span>\n        }<\/span>\n\n        @<\/span>Override\n        public<\/span> void<\/span> beforeTextChanged(<\/span>CharSequence s,<\/span> int<\/span> start,<\/span> int<\/span> count,<\/span> int<\/span> after)<\/span> {<\/span>\n\n        }<\/span>\n\n        @<\/span>Override\n        public<\/span> void<\/span> afterTextChanged(<\/span>Editable s)<\/span> {<\/span>\n\n        }<\/span>\n    }<\/span>;<\/span>\n\n    private<\/span> TextWatcher editTextWatcherForFractionLimit =<\/span> new<\/span> TextWatcher(<\/span>)<\/span> {<\/span>\n\n        @<\/span>Override\n        public<\/span> void<\/span> onTextChanged(<\/span>CharSequence s,<\/span> int<\/span> start,<\/span> int<\/span> before,<\/span> int<\/span> count)<\/span> {<\/span>\n\n            if<\/span> (<\/span>!<\/span>editText.<\/span>getText(<\/span>)<\/span>.<\/span>toString(<\/span>)<\/span>.<\/span>equalsIgnoreCase(<\/span>\"\"<\/span>)<\/span>)<\/span> {<\/span>\n\n                String<\/span> editTextString =<\/span> editText.<\/span>getText(<\/span>)<\/span>.<\/span>toString(<\/span>)<\/span>.<\/span>trim(<\/span>)<\/span>;<\/span>\n                int<\/span> decimalIndexOf =<\/span> editTextString.<\/span>indexOf(<\/span>\".\"<\/span>)<\/span>;<\/span>\n\n                if<\/span> (<\/span>decimalIndexOf ><\/span>=<\/span> 0<\/span>)<\/span> {<\/span>\n\n                    if<\/span> (<\/span>editTextString.<\/span>substring(<\/span>decimalIndexOf)<\/span>.<\/span>length(<\/span>)<\/span> ><\/span> fractionLimit)<\/span> {<\/span>\n\n                        startStopEditing(<\/span>true<\/span>)<\/span>;<\/span>\n\n                    }<\/span>\n                }<\/span>\n\n            }<\/span>\n\n        }<\/span>\n\n        @<\/span>Override\n        public<\/span> void<\/span> beforeTextChanged(<\/span>CharSequence s,<\/span> int<\/span> start,<\/span> int<\/span> count,<\/span> int<\/span> after)<\/span> {<\/span>\n\n        }<\/span>\n\n        @<\/span>Override\n        public<\/span> void<\/span> afterTextChanged(<\/span>Editable s)<\/span> {<\/span>\n\n        }<\/span>\n    }<\/span>;<\/span>\n\n    public<\/span> void<\/span> limitCharacters(<\/span>final<\/span> int<\/span> limit)<\/span> {<\/span>\n\n        this<\/span>.<\/span>charactersLimit =<\/span> limit;<\/span>\n        editText.<\/span>addTextChangedListener(<\/span>editTextWatcherForCharacterLimits)<\/span>;<\/span>\n    }<\/span>\n\n    public<\/span> void<\/span> limitFractionDigitsinDecimal(<\/span>int<\/span> fractionLimit)<\/span> {<\/span>\n\n        this<\/span>.<\/span>fractionLimit =<\/span> fractionLimit;<\/span>\n        editText.<\/span>addTextChangedListener(<\/span>editTextWatcherForFractionLimit)<\/span>;<\/span>\n    }<\/span>\n\n    public<\/span> void<\/span> unlockEditText(<\/span>)<\/span> {<\/span>\n\n        startStopEditing(<\/span>false<\/span>)<\/span>;<\/span>\n    }<\/span>\n\n    public<\/span> void<\/span> startStopEditing(<\/span>boolean<\/span> isLock)<\/span> {<\/span>\n\n        if<\/span> (<\/span>isLock)<\/span> {<\/span>\n\n            editText.<\/span>setFilters(<\/span>new<\/span> InputFilter[<\/span>]<\/span> {<\/span> new<\/span> InputFilter(<\/span>)<\/span> {<\/span>\n                @<\/span>Override\n                public<\/span> CharSequence filter(<\/span>CharSequence source,<\/span> int<\/span> start,<\/span> int<\/span> end,<\/span> Spanned dest,<\/span> int<\/span> dstart,<\/span> int<\/span> dend)<\/span> {<\/span>\n                    return<\/span> source.<\/span>length(<\/span>)<\/span> <<\/span> 1<\/span> ?<\/span> dest.<\/span>subSequence(<\/span>dstart,<\/span> dend)<\/span> :<\/span> \"\"<\/span>;<\/span>\n                }<\/span>\n            }<\/span> }<\/span>)<\/span>;<\/span>\n\n        }<\/span> else<\/span> {<\/span>\n\n            editText.<\/span>setFilters(<\/span>new<\/span> InputFilter[<\/span>]<\/span> {<\/span> new<\/span> InputFilter(<\/span>)<\/span> {<\/span>\n                @<\/span>Override\n                public<\/span> CharSequence filter(<\/span>CharSequence source,<\/span> int<\/span> start,<\/span> int<\/span> end,<\/span> Spanned dest,<\/span> int<\/span> dstart,<\/span> int<\/span> dend)<\/span> {<\/span>\n                    return<\/span> null<\/span>;<\/span>\n                }<\/span>\n            }<\/span> }<\/span>)<\/span>;<\/span>\n        }<\/span>\n    }<\/span>\n}<\/span><\/pre>\n
Code for Main.java<\/b><\/h2>\n
package<\/span> com<\/span>.<\/span>edittextlocker<\/span>;<\/span>\n\nimport<\/span> android<\/span>.<\/span>app<\/span>.<\/span>Activity<\/span>;<\/span>\nimport<\/span> android<\/span>.<\/span>os<\/span>.<\/span>Bundle<\/span>;<\/span>\nimport<\/span> android<\/span>.<\/span>widget<\/span>.<\/span>EditText<\/span>;<\/span>\n\npublic<\/span> class<\/span> Main extends<\/span> Activity {<\/span>\n\n    private<\/span> EditText editText;<\/span>\n\n    private<\/span> EditText decimalEditText;<\/span>\n\n    @<\/span>Override\n    public<\/span> void<\/span> onCreate(<\/span>Bundle savedInstanceState)<\/span> {<\/span>\n\n        super<\/span>.<\/span>onCreate(<\/span>savedInstanceState)<\/span>;<\/span>\n        setContentView(<\/span>R.<\/span>layout.<\/span>main)<\/span>;<\/span>\n\n        editText =<\/span> (<\/span>EditText)<\/span> findViewById(<\/span>R.<\/span>id.<\/span>edittext)<\/span>;<\/span>\n        decimalEditText =<\/span> (<\/span>EditText)<\/span> findViewById(<\/span>R.<\/span>id.<\/span>decimal_edittext)<\/span>;<\/span>\n\n        EditTextLocker editTextLocker =<\/span> new<\/span> EditTextLocker(<\/span>editText)<\/span>;<\/span>\n        editTextLocker.<\/span>limitCharacters(<\/span>4<\/span>)<\/span>;<\/span>\n\n        EditTextLocker decimalEditTextLocker =<\/span> new<\/span> EditTextLocker(<\/span>decimalEditText)<\/span>;<\/span>\n        decimalEditTextLocker.<\/span>limitFractionDigitsinDecimal(<\/span>2<\/span>)<\/span>;<\/span>\n\n    }<\/span>\n\n}<\/span><\/pre>\n
Code for main.xml<\/b><\/h2>\n
<?<\/span>xml<\/span>version<\/span>=<\/span>\"<\/span>1.0<\/span>\"<\/span>encoding<\/span>=<\/span>\"<\/span>utf-8<\/span>\"<\/span>?><\/span>\n<<\/span>LinearLayout<\/span> xmlns<\/span>:<\/span>android<\/span>=<\/span>\"<\/span>http<\/span>:<\/span>\/\/<\/span>schemas.android.com<\/span>\/apk\/res\/android<\/span>\"<\/span>\n    android:layout_width<\/span>=<\/span>\"<\/span>fill_parent<\/span>\"<\/span>\n    android:layout_height<\/span>=<\/span>\"<\/span>fill_parent<\/span>\"<\/span>\n    android:orientation<\/span>=<\/span>\"<\/span>vertical<\/span>\"<\/span> ><\/span>\n\n    <<\/span>EditText<\/span>\n        android:id<\/span>=<\/span>\"<\/span>@+id\/edittext<\/span>\"<\/span>\n        android:layout_width<\/span>=<\/span>\"<\/span>fill_parent<\/span>\"<\/span>\n        android:layout_height<\/span>=<\/span>\"<\/span>wrap_content<\/span>\"<\/span>\n        android:hint<\/span>=<\/span>\"<\/span>Accepts any 4 characters<\/span>\"<\/span> ><\/span>\n    <\/<\/span>EditText<\/span>><\/span>\n\n    <<\/span>EditText<\/span>\n        android:id<\/span>=<\/span>\"<\/span>@+id\/decimal_edittext<\/span>\"<\/span>\n        android:layout_width<\/span>=<\/span>\"<\/span>wrap_content<\/span>\"<\/span>\n        android:layout_height<\/span>=<\/span>\"<\/span>wrap_content<\/span>\"<\/span>\n        android:inputType<\/span>=<\/span>\"<\/span>numberDecimal<\/span>\"<\/span>\n        android:hint<\/span>=<\/span>\"<\/span>Accepts decimal with 2 fraction digits<\/span>\"<\/span> \/><\/span>\n\n<\/<\/span>LinearLayout<\/span>><\/span><\/pre>\n
You can download the complete source code for the project from here<\/a><\/p>\n
what is the best way to support my manwhy your ex girlfriend what u as your frind she have a boy friend We Just Spoke After Breaking Up What Next<\/a> how do i win my boyfriend backmy ex girlfriend tells everyone hello but me<\/div>\n","protected":false},"excerpt":{"rendered":"
Sometimes requirement comes in a way when one needs to restrict characters to be entered in Edit Text. Scenario can be \u201cusername should be greater than 6 characters\u201d, \u201caccepts only decimal number with 2 digits after fraction\u201d, etc. In this regard, EditText’ setFilters works at its best. EditText’s setFilters method can be used while playing […]<\/p>\n","protected":false},"author":27,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_s2mail":"","footnotes":""},"categories":[4],"tags":[459,201,204,203],"class_list":["post-1614","post","type-post","status-publish","format-standard","hentry","category-android","tag-android","tag-edittext","tag-edittext-setfilters","tag-numeric-only-edittext"],"yoast_head":"\nAndroid EditText : setFilters Example : Numeric Text<\/title>\n<meta name=\"description\" content=\"Learn more on Android programming and how to develop Android mobile phone and tablet applications using Android EditText control\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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