I have to restrict users from typing Special Characters in the Search view.

I have already defined the input type as textPersonName, but the users should not be able to type any Special Characters in the first place.

When I tried to cast it to an EditText. It throws an exception, as below:

  val filter: InputFilter = object : InputFilter {
            override fun filter(
                source: CharSequence,
                start: Int,
                end: Int,
                dest: Spanned?,
                dstart: Int,
                dend: Int
            ): CharSequence? {
                for (i in start until end) {
                    if (!Character.isLetterOrDigit(source[i])) {
                        return ""
                    }
                }
                return null
            }
        }
        var etSearch = searchview_filter as EditText
        etSearch.filters = arrayOf(filter)
    

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.sbi.investtap, PID: 12227
    java.lang.ClassCastException: androidx.appcompat.widget.SearchView cannot be cast to android.widget.EditText

CodePudding user response：

This may help you, you need to check your input when users typing data. You need to set your validation inside filter.

InputFilter filter = new InputFilter() {
    public CharSequence filter(CharSequence source, int start, int end,
            Spanned dest, int dstart, int dend) {
        for (int i = start; i < end; i  ) {
            if (!Character.isLetterOrDigit(source.charAt(i))) {
                return "";
            }
        }
        return null;
    }
};

fetch editText from searchview like this; No need to change edittext's id, because it is default android id of Search EditText.

var etSearch = searchview_filter.findViewById(R.id.search_src_text) as EditText
etSearch.filters = arrayOf(filter)

CodePudding user response：

This is how you may achieve this in Kotlin:

InputFilter filter = new InputFilter() {
    public CharSequence filter(CharSequence source, int start, int end,
            Spanned dest, int dstart, int dend) {
        for (int i = start; i < end; i  ) {
            if (!Character.isLetterOrDigit(source.charAt(i))) {
                return "";
            }
        }
        return null;
    }
};


   var etSearch = searchview_filter.findViewById(R.id.search_src_text) as EditText
        etSearch.filters = arrayOf(filter)