Kotlin TextView.text +=
Kotlin TextView.text +=
i have tried txtCalc.text = "The text" + "0" and it doesn't work
You might want to look at android data binding if you want to actually use modifiable view strings
– cricket_007
Jul 1 at 14:30
2 Answers
2
If you read the current text in the TextView, you'll get a CharSequence, which you'll have to turn into a string before concatenating anything to it:
TextView
CharSequence
textView.text = textView.text.toString() + "0"
Or you can just use the append method of TextView:
append
TextView
textView.append("0")
Or if you literally want to use +=, you can create your own extension on TextView:
+=
TextView
inline operator fun TextView.plusAssign(text: CharSequence) = append(text)
textView += "0"
thanks i have used textView.append("0") it's good but how about if i want to add 0 before the old text Like textView.text = "0" + textView.text
– Lezhar Ayman
Jul 1 at 15:17
You can still use the first code example I've shown you - either as is, or with string templates as shown in the other answer by @Willi Mentzel
– zsmb13
Jul 1 at 15:23
A CharSequence, which text is, does not define the + (plus operator).
text
+
Using a string template you can write it more concise anyway.
Note:toString() is called implicitly on text (CharSequence) which turns it into a String.
toString()
CharSequence
String
textView.text = "${textView.text}0"
Not Working Still the same Error image.ibb.co/eAx46d/Screenshot_from_2018_07_01_15_58_34.png
– Lezhar Ayman
Jul 1 at 15:03
image.ibb.co/eAx46d/Screenshot_from_2018_07_01_15_58_34.png
– Lezhar Ayman
Jul 1 at 15:05
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idownvotedbecau.se/itsnotworking
– cricket_007
Jul 1 at 14:27