For example, the control input box can only enter numbers:
The first is to use attribute control in the xml file
<EditText
android:id="@+id/login_input_num_et"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1"
android:background="@null"
android:digits="0123456789"
android:hint="@string/login_01"
android:inputType="number"
android:maxLength="10"
android:paddingLeft="13dp"
android:paddingTop="1dp"
android:paddingRight="13dp"
android:paddingBottom="1dp"
android:singleLine="true"
android:textColor="@color/se_0000"
android:textColorHint="@color/se_bcbf"
android:textSize="12sp"
android:textStyle="bold" />The second, through code dynamic control
login_input_num_et.addTextChangedListener(NumChangeListener())
inner class NumChangeListener : TextWatcher {
override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
}
override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
val editable: String = getNum()
val str = accountFilter(editable)
if (editable != str) {
login_input_num_et.setText(str)
login_input_num_et.setSelection(str!!.length)
}
}
override fun afterTextChanged(p0: Editable?) {
}
}
fun accountFilter(str: String?): String? {
// 只允许数字
val regEx = "[^0-9]"
val p: Pattern = Pattern.compile(regEx)
val m: Matcher = p.matcher(str)
return m.replaceAll("").trim()
} Another matching rule:
such as:
only numbers and letters can be entered val regEx = "[^a-zA-Z0-9]"
Only numbers, letters, and designated symbols can be entered val regEx = "[^a-zA-Z0-9@_.]"
(numbers, letters, @ _ .)