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Javier fr
Asked: 2020-02-28 12:09:31 +0800 CST 2020-02-28 12:09:31 +0800 CST

Block comma "," key in Android Studio XML

  • 772

I want to prevent a user from entering a comma “,” in a EditText, investigate what can be done with the property android:digits=””but you have to enter the remaining characters, will there be a property to block that property in the XML?. Thanks.

This is my EditText:

 <xxxx_android_v1.com.xxxx.sap.xxxx.xxxx_v1.Utility.DTWCustomEditText
                            android:id="@+id/textViewDescGuardar"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:ems="8"
                            android:maxLines="1"
                            android:maxLength="50"
                            android:digits="@string/caracteres"
                            android:inputType="textPersonName" />
android-studio

1 Answers

  1. Best Answer

    Block adding characters in a EditText:

    Programmatically you can do it by not allowing certain characters, you can add an InputFilter to avoid writing a certain character in a EditText, first create the InputFilter to validate if it contains the character you don't want and return an empty String when trying to write it:

    private String charactersForbiden = ","; //*Caracter o caracteres no permitidos.

private InputFilter inputfilter = new InputFilter() {

    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {

        if (source != null && charactersForbiden .contains(("" + source))) {
            return "";
        }
        return null;
    }
};

    Now assign it to your EditText:

    EditText editText = (EditText) findViewById(R.id.myEditText);
editText.setFilters(new InputFilter[] { inputfilter });

    You can even prevent other characters from being written by adding them to the variable 

      private String charactersForbiden = ",%$ñ[*]";

    Adding an InputFilter disables the property android:maxLength, but you can add this property on the filter to re-enable it:

    myEditText.setFilters(new InputFilter[] {new InputFilter.LengthFilter(50), inputfilter });
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