Alternative for String.join in Android?

Question

I want to concatenate an ArrayList with commas as separators. I found this answer, stating it's possible to use String.join in Java.

When I try to use this however, Android Studio gives the following error:

Cannot resolve method 'join(java.lang.String, java.lang.String, java.lang.String, java.lang.String)'

Is there a good, concise alternative for Android Studio (instead of using a for loop)?

score 217 · Accepted Answer · answered Nov 19 '15 at 11:46

217

You can use TextUtils.join instead:

String result = TextUtils.join(", ", list);

(String.join was added in Java 8, which is why you can't use it in Android.)

answered Nov 19 '15 at 11:46

Jon Skeet

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To save a few clicks to non Android Studio users: `import android.text.TextUtils` – Peter Jankuliak Nov 21 '18 at 10:29
Using TextUtils may cause problem with unit test. In that case use a function from here : https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/core/java/android/text/TextUtils.java – Subin Jul 04 '19 at 19:15
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@Subin: What kind of problem? And why link to TextUtils as an alternative to TextUtils? I'm afraid your comment isn't really clear. – Jon Skeet Jul 04 '19 at 20:22
@JonSkeet Cause this problem : https://stackoverflow.com/q/35763289/1372424 Solution from here : https://medium.com/@okmanideep/dont-create-that-stringutils-to-unit-test-your-android-class-8ab32af34e84 – Subin Jul 05 '19 at 21:02
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@Subin: Right, so *specifically* if you're using Mockito. And note that the solution is a matter of copying the TextUtils source into your test project. – Jon Skeet Jul 05 '19 at 21:22

score 7 · Answer 2 · edited Nov 08 '16 at 05:04

7

String[] List ={"<html>","<body>","<title>"};
String abc;       
abc =TextUtils.join("\n", List);
textmsg.getText().insert(textmsg.getSelectionStart(), abc);

result:

<html>
<body>
<title>

edited Nov 08 '16 at 05:04

V-rund Puro-hit

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answered Nov 07 '16 at 20:07

BREI

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score 3 · Answer 3 · answered Nov 19 '15 at 12:12

3

You can use this

TextUtils.join(", ", your_list);

answered Nov 19 '15 at 12:12

Zeeshan Ahmed

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Alternative for String.join in Android?

3 Answers3

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