[英]Android edittext - do not allow decimal separator alone
I have an Edittext, where I want to allow only numbers and decimal numbers (max 2 decimals after separator eg 125.50). 我有一个Edittext,我只允许数字和十进制数字(分隔符后最多2个小数,例如125.50)。
I implemented a filter for this: 我为此实现了一个过滤器:
final EditText field1 = (EditText)findViewById(R.id.field1);
field1.setFilters(new InputFilter[] { filter });
InputFilter filter = new InputFilter() {
final int maxDigitsBeforeDecimalPoint=5;
final int maxDigitsAfterDecimalPoint=2;
@Override
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
StringBuilder builder = new StringBuilder(dest);
builder.replace(dstart, dend, source
.subSequence(start, end).toString());
if (!builder.toString().matches(
"(([0-9]{1})([0-9]{0,"+(maxDigitsBeforeDecimalPoint-1)+"})?)?(\\.[0-9]{0,"+maxDigitsAfterDecimalPoint+"})?"
)) {
if(source.length()==0)
return dest.subSequence(dstart, dend);
return "";
}
return null;
}
};
This is working fine , but the problem is, that if user inserts decimal separator ALONE, I've got java.lang.NumberFormatException: For input string: "." 这工作正常 ,但是问题是,如果用户插入小数点分隔符ALONE,则将出现java.lang.NumberFormatException:对于输入字符串:“。”
In my ontextChanged I tried this: 在我的ontextChanged中,我尝试了以下操作:
if(field1.getText().toString().equals("[.]")){field1.setText(0);}
also this 还有这个
if(field1.getText().toString().equals(".")){field1.setText(0);}
but did not work. 但没有用。
How can I restrict the decimal separator alone, but allow it with the numbers? 如何仅限制小数点分隔符,但允许带数字呢?
If this: 如果这:
if(field1.getText().toString().equals(".")){field1.setText(0);}
is your exact code, then for sure it failed because 0
is not a string, it's an integer considered to be a resource id. 是您的确切代码,然后确定它失败了,因为
0
不是字符串,它是一个整数,被视为资源ID。
So first try this: 因此,首先尝试:
if(field1.getText().toString().equals(".")){field1.setText("0");}
If it fails again then consider that a NumberFormatException
can be resolved by try/catch
like this: 如果再次失败,则考虑可以通过
try/catch
来解决NumberFormatException
,如下所示:
double value = 0.0;
try {
value = Double.parseDouble(field1.getText().toString());
} catch (NumberFormatException e) {
field1.setText("0");
e.printStackTrace();
}
For References, you can use this link if you want to use InputFilter: https://stackoverflow.com/a/5368816/10396176 对于参考,如果要使用InputFilter,可以使用此链接: https ://stackoverflow.com/a/5368816/10396176
For other references, if you want using want to try using textWatcher: https://stackoverflow.com/a/16684661/10396176 对于其他参考,如果您想使用,请尝试使用textWatcher: https ://stackoverflow.com/a/16684661/10396176
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