Combining Urdu String through Data Binding

Today, I had a case in my app where there was an EditText and TextView. The goal was that when EditText is changed, then TextView value will be updated instantly. So TextView value will be like this:

    textView = "SOME URDU STRING 1" + editTextValue + "ANOTHER URDU STRING"


First, I added a String value in my strings.xml file which was like this:

    <resources>
        <string name="app_name">AppName</string>
        <string name="sarbarah_str">آپ کا گھر کے سربراہ %s سے کیا رشتہ ہے؟</string>        // My String
    </resources>

Please note the %s in the string. That’s where magic happens. Then in my layout, I had EditText and TextView like this:

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">

    <data>
        <import type="com.wajahatkarim3.myapp.R"/>
    </data>

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".DemoActivity">


        <EditText
            android:id="@+id/editText"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onTextChanged='@{(text, start, before, count) -> textView.setText(String.format(context.getString(R.string.sarbarah_str, text)))}' />

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:text="@string/sarbarah_str"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/editText" />

    </android.support.constraint.ConstraintLayout>
</layout>

So, the main line is:

    android:onTextChanged='@{(text, start, before, count) -> textView.setText(String.format(context.getString(R.string.sarbarah_str, text)))}'

So, whatever text is entered in EditText, that is added in place of %s in the string, and that value is set to the TextView.

And that’s it.


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Wajahat Karim
🌍 Making the world a better place, one app at a time.
🔥 Google Developer Expert (GDE) in Android . 📱 Professional Android Developer with ~7 years experience. 💻 Creator of various Open Source libraries on Android . 📝 Author of two technical books and 100+ articles on Android. 🎤 A passionate Public Speaker giving talks all over the world.
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Wajahat Karim

🔥 Google Dev Expert (GDE) in Android .
📱 Android Dev. 💻 Open Source Contributor . 📝 Technical Writer . 🎤 Public Speaker

Senior Android Developer

Karachi, Pakistan