<EditText
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:imeOptions="actionNext"
android:inputType="textNoSuggestions|textCapCharacters"
android:maxLength="3"
android:hint="ABC"
/>
还有另一个EditText
,当所有 3 个符号都填写在name
时,应该重点关注。
name.addTextChangedListener(object: TextWatcher {
override fun afterTextChanged(s: Editable?) {
// Move to surname when all three symbols are entered.
if (name.text.toString().length == 3) {
surname.requestFocus()
}
}
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) { }
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) { }
})
当我们输入 1、2 和 3 个符号时,它就会正常工作。但是当我们选择name
中的最后一个位置时,按键盘中的新字母,没有任何反应。我试图抓住按键
name.setOnKeyListener { v, keyCode, event ->
if (name.text.getText().length == 3) {
surname.requestFocus()
}
false
}
但事件不会发生。如何移动焦点?
将maxLength
更改为 4
android:maxLength="4"
在afterTextChanged
:
override fun afterTextChanged(s: Editable?) {
// Move to surname when all three symbols are entered.
if (name.isFocused() && name.text.toString().length > 3) {
surname.requestFocus();
name.setText(s.toString().substring(0,3));
}
}
在 beforeTextChanged(( 中添加一个检查,以确定字符序列的长度是否已经是 3 个字符,如果是这样,则请求关注姓氏
根据我@nupadhyaya回答。
1(删除android:maxLength="3"
(或可以设置android:maxLength="4"
(。
2( 为新交易品种添加了事件:
name.addTextChangedListener(object: TextWatcher {
override fun afterTextChanged(s: Editable?) {
val text = name.text.toString()
if (text.length >= 3) {
surname.requestFocus()
if (text.length > 3) {
// Remove symbols after third.
name.setText(text.substring(0, 3))
}
}
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) { }
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) { }
})
}
3(添加了姓氏Backspace
键的事件:
surname.setOnKeyListener { _, keyCode, _ ->
if (keyCode == KeyEvent.KEYCODE_DEL && surname.text.toString().isEmpty()) {
// Move to the last symbol of name.
name.requestFocus()
name.setSelection(name.text.toString().length)
}
false
}