如何禁止在 EditText 中输入除字母字符外的任何字符？

如果您只需要拉丁字母，则在 xml 中添加：

android:digits="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"

否则

EditText state = (EditText) findViewById(R.id.txtState);

Pattern ps = Pattern.compile("^[a-zA-Z ]+$");
Matcher ms = ps.matcher(state.getText().toString());
boolean bs = ms.matches();
if (bs == false) {
    if (ErrorMessage.contains("invalid"))
        ErrorMessage = ErrorMessage + "state,";
    else
        ErrorMessage = ErrorMessage + "invalid state,";
}

答案取自这里

InputFilter filter = new InputFilter() { 
    public CharSequence filter(CharSequence src, int start, int end, Spanned d, int dstart, int dend) { 
        for (int i = start; i < end; i++) { 
            if (!Character.isLetter(src.charAt(i))) { 
                return src.subSequence(start, i-1); 
            } 
        } 
        return null; 
    } 
}; 

edit.setFilters(new InputFilter[]{filter});