[英]How to set input type and format in EditText using kotlin?
我想强迫用户输入一个数字,而我正在使用它(并且工作正常):
android:inputType="number"
我想强迫用户只输入两个数字(Int或Double无关紧要),这些数字必须在0到20(或0.0到20.0)之间:例如:0或0.0 1或1.5(1.0等)。 。 。 20或20.0
这是我喜欢的方式:
添加此内容以编辑文本
android:inputType="numberDecimal"
(要么)
android:digits="0123456789."
科特林::
class InputFilterMinMax(min:Float, max:Float): InputFilter {
private var min:Float = 0.0F
private var max:Float = 0.0F
init{
this.min = min
this.max = max
}
override fun filter(source:CharSequence, start:Int, end:Int, dest: Spanned, dstart:Int, dend:Int): CharSequence? {
try
{
val input = (dest.subSequence(0, dstart).toString() + source + dest.subSequence(dend, dest.length)).toFloat()
if (isInRange(min, max, input))
return null
}
catch (nfe:NumberFormatException) {}
return ""
}
private fun isInRange(a:Float, b:Float, c:Float):Boolean {
return if (b > a) c in a..b else c in b..a
}
}
然后在您的EditText上设置过滤器:
myEditText.setFilters(arrayOf<InputFilter>(InputFilterMinMax(0.0F, 20.0F)))
Java的:
public class InputFilterMinMax implements InputFilter {
private float min;
private float max;
public InputFilterMinMax(float min, float max) {
this.min = min;
this.max = max;
}
@Override
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
//noinspection EmptyCatchBlock
try {
float input = Float.parseFloat(dest.subSequence(0, dstart).toString() + source + dest.subSequence(dend, dest.length()));
if (isInRange(min, max, input))
return null;
} catch (NumberFormatException nfe) { }
return "";
}
private boolean isInRange(float a, float b, float c) {
return b > a ? c >= a && c <= b : c >= b && c <= a;
}
}
然后在您的EditText上设置过滤器:
myEditText.setFilters(new InputFilter[]{new InputFilterMinMax(0.0, 20.0)});
使用TextWatcher
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.