I want to concat two strings for a TextView in android, Data Binding Api

Question

Im using DataBinding Api for setting the views in android layouts. Here is my layout.

layout.xml

<?xml version="1.0" encoding="utf-8"?>
 <layout xmlns:android="http://schemas.android.com/apk/res/android">
  <data>
    <variable name="user" type="testing.sampleapp.com.sampleapp.User"/>
  </data>
<LinearLayout
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@{ "Hello " + user.firstName}"/>
</LinearLayout>

I want the TextView to display Hello UserName. How to achieve this using the data binding api.

Ravi · Accepted Answer · 2019-05-15T03:26:40.130

330

concate it with grave accent (`)

android:text="@{`Hello ` + user.firstName}"/>

You can concat it in multiple ways, check it here concat-two-strings-in-textview-using-databinding

edited May 15 '19 at 03:26

answered Oct 14 '16 at 09:41

Ravi

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Yeah it worked. Thanks . I was using single inverted comma ('). Grave accent(`) worked for me. – Sasank Sunkavalli Oct 14 '16 at 09:46
@SasankSunkavalli glad to help you :) , always use grave accent for string when using DataBinding. – Ravi Oct 14 '16 at 09:47
1

I don't get it. On my .xml this method, as well as any other methods on this page, is not even close to being functional. All it does is prints as : `@{`Hello ` + user.firstName}` – ekashking Nov 04 '19 at 03:34
This is DataBinding? – IgorGanapolsky Dec 27 '19 at 22:10

score 99 · Answer 2 · edited Aug 17 '20 at 10:48

99

This is already answered by @GeorgeMount in comments to one of the solution. Which to me looks like the best solution so far here.

android:text="@{@string/location(user.city,user.state)}"

in your strings.xml

<string name="location">%1$s, %2$s</string>

edited Aug 17 '20 at 10:48

iCantC

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answered Apr 16 '18 at 19:37

Prakash

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great! thnx wery – Serg Burlaka Sep 19 '18 at 11:16
thats what I'm looking for :) – Edhar Khimich Mar 25 '19 at 02:35

score 13 · Answer 3 · answered Jul 27 '17 at 15:05

13

Since xml supports single quotes for values of attribute, you can also do this :

android:text='@{"Hello "+user.firstName}'

answered Jul 27 '17 at 15:05

ArJ

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score 10 · Answer 4 · answered Dec 26 '19 at 08:21

10

In case of static string and other dynamic you can use this

android:text="@{`Hello ` + user.firstName}"/>

In case of dynamic data you can use this.

android:text='@{user.firstName+" "+user.lastName}'

answered Dec 26 '19 at 08:21

kishan verma

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Yogesh Rathi · Answer 5 · 2018-08-13T13:59:50.020

8

There are two ways.

First Solution

concat with grave accent (`)

android:text="@{`Hello ` + user.firstName}"/>

Second Solution

Declare Your string in strings.xml

like "Hello %1$s , (whatever you want to add then add here)".

amd use String.format(stringResource, upsatename);

edited Aug 13 '18 at 13:59

answered Oct 14 '16 at 09:42

Yogesh Rathi

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I know this would work, But i want to use the concat way – Sasank Sunkavalli Oct 14 '16 at 09:43
25

You can also use formatted string resources in the expression: `android:text="@{@string/hello(user.firstName)}"` – George Mount Oct 14 '16 at 20:44
it's %1$s instead of %$1s... ;) – Rik van Velzen Jul 06 '18 at 10:11

score 5 · Answer 6 · answered Jun 01 '18 at 09:11

5

if you want to concat String resource with data from your model, you can do it in such way:

 android:text='@{@string/release_date+model.release_date}'

answered Jun 01 '18 at 09:11

Jackky777

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score 4 · Answer 7 · answered Aug 09 '17 at 09:19

To do a concat in xml layout:

<data>

/*This is used for android view*/
<import type="android.view.View" />

/*This is used for android resources*/
<import type="com.myapp.R" />

/*This is app context*/
<variable
    name="context"
    type="android.content.Context" />

/*This is used for model data*/
<variable
    name="item"
    type="com.myapp.models.Chapter" />
</data>

android:text="@{item.serialNo.concat(@string/space).concat(item.title)}"

In strings.xml I have added code for blank space:

<string name="space">\u0020</string>

score 4 · Answer 8 · answered Jul 11 '22 at 12:15

4

Concat with the Backtick symbol `
Example:

android:text="@{product.price + `USD`}"

answered Jul 11 '22 at 12:15

Saad Ahmed

71
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score 1 · Answer 9 · answered May 28 '22 at 08:02

1

Few cents from me

If you want to check null and set default value try this answer

 android:text='@{(user.first_name ?? "") +" "+ (user.last_name ?? "")}'

answered May 28 '22 at 08:02

Ranjithkumar

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Aziz · Answer 10 · 2019-11-24T12:47:10.973

0

The simplest way I found to be is to replace ''(single) in place of ""(double), For Eg. You have two variables,

<variable name="a" type="String" />
<variable name="b" type="String" />

Now to concatenate,

android:text='a + " " + b}'

edited Nov 24 '19 at 12:47

answered Sep 30 '19 at 10:18

Aziz

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score 0 · Answer 11 · answered Dec 07 '20 at 12:48

0

Probably late to the party: Below code will also work

android:text='@{@string/hello.concat(user.firstName)}'

answered Dec 07 '20 at 12:48

madroid

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Manisha Saini · Answer 12 · 2022-12-27T04:54:23.533

0

Got the same issue, this is what worked for me, hope it helps!!

android:text='@{"$"+String.valueOf(bean.payment_for==1?bean.price:bean.tip_amount)}'

edited Dec 27 '22 at 04:54

answered Dec 20 '22 at 07:33

Manisha Saini

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score 0 · Answer 13 · answered Mar 02 '23 at 12:34

activity_main,xml:

<TextView
        android:id="@+id/word_count"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/word_count"
        tools:text="3 of 10 story" />

string.xml:

<string name="word_count">%d of %d words</string>

MainActivity.xml:

binding.wordCount.text = getString(R.string.word_count, 3, 10)

Output:

I want to concat two strings for a TextView in android, Data Binding Api

13 Answers13

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