Dynamic AutoCompleteTextView in Kotlin

28 Mar, 2022
Android AutoCompleteTextView is an editable text view which shows a list of suggestions when user starts typing text. When a user starts typing, a dropdown menu will be there based on the entered characters, defined in threshold limit and user can choose an item from list to replace the text.
The AutoCompleteTextView is a subclass of EditText class so we can easily inherit all the properties of EditText as per our requirements.
The dropdown list will be obtained suing data adaptor and these suggestions will be appeared only after entering the minimum number characters defined in the Threshold limit. The Threshold limit is used to define the minimum number of characters the user must type to see the dropdown list of suggestions.
In android, we can create a AutoCompleteTextView control in two ways either manually in XML file or create it in Activity file programmatically.
First we create a new project by following the below steps:
Click on File, then New => New Project.After that include the Kotlin support and click on next.Select the minimum SDK as per convenience and click next button.Then select the Empty activity => next => finish.
Click on File, then New => New Project.
After that include the Kotlin support and click on next.
Select the minimum SDK as per convenience and click next button.
Then select the Empty activity => next => finish.
In this file, we only use the LinearLayout and set it attributes.
XML
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:id="@+id/linear_layout"    android:gravity = "center">  </LinearLayout>
Here, we will specify the name of the activity and define other strings which can be used at different places in our activity. Another important thing is that we will define string_array which contains the items for the suggestion list of AutoCompleteTextView.
XML
<resources>    <string name="app_name">DynamicAutoCompleteTextView</string>    <string name="hint">Please type language...</string>    <string name="submit">Submit</string>    <string name="submitted_lang">Submitted language:</string>      <string-array name="Languages">        <item>Java</item>        <item>Kotlin</item>        <item>Swift</item>        <item>Python</item>        <item>Scala</item>        <item>Perl</item>        <item>Javascript</item>        <item>Jquery</item>    </string-array>  </resources>
First of all, we declare two variables autotextview and button to create the widgets and set their attributes.
val autotextView = AutoCompleteTextView(this)
val button = Button(this)

and add both autotextview and button in LinearLayout using
val linearLayout = findViewById(R.id.linear_layout)
   // Add AutoCompleteTextView and button to LinearLayout
     linearLayout?.addView(autotextView)
     linearLayout?.addView(button)

then, we declare another variable languages to get the items of the string-array from the strings.xml file.
val languages = resources.getStringArray(R.array.Languages)
Create an adaptor and add into the AutoCompleteTextView of LinearLayout using
val adapter = ArrayAdapter(this,
       android.R.layout.simple_list_item_1, languages)
       autotextView.setAdapter(adapter)

Kotlin
package com.geeksforgeeks.myfirstkotlinapp  import android.os.Bundleimport android.view.Viewimport android.view.ViewGroupimport android.widget.*import androidx.appcompat.app.AppCompatActivity  class MainActivity : AppCompatActivity() {      override fun onCreate(savedInstanceState: Bundle?) {        super.onCreate(savedInstanceState)        setContentView(R.layout.activity_main)          //create AutoCompleteTextView and button        val autotextView = AutoCompleteTextView(this)        val button = Button(this)        val layoutParams = LinearLayout.LayoutParams(            ViewGroup.LayoutParams.MATCH_PARENT,            ViewGroup.LayoutParams.WRAP_CONTENT)        autotextView.layoutParams = layoutParams        button.layoutParams = layoutParams        layoutParams.setMargins(30, 30, 30, 30)        autotextView.setHint(R.string.hint)        button.setText("Submit")              val linearLayout = findViewById<LinearLayout>(R.id.linear_layout)        // Add AutoCompleteTextView and button to LinearLayout        linearLayout?.addView(autotextView)        linearLayout?.addView(button)            // Get the array of languages        val languages = resources.getStringArray(R.array.Languages)        // Create adapter and add in AutoCompleteTextView        val adapter = ArrayAdapter(this,            android.R.layout.simple_list_item_1, languages)        autotextView.setAdapter(adapter)            if (button != null) {            button?.setOnClickListener(View.OnClickListener {                val enteredText = getString(R.string.submitted_lang)+ " " +                        autotextView.getText()                Toast.makeText(this@MainActivity,                    enteredText, Toast.LENGTH_SHORT).show()            })        }    }}
XML
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.geeksforgeeks.myfirstkotlinapp">  <application    android:allowBackup="true"    android:icon="@mipmap/ic_launcher"    android:label="@string/app_name"    android:roundIcon="@mipmap/ic_launcher_round"    android:supportsRtl="true"    android:theme="@style/AppTheme">    <activity android:name=".MainActivity">        <intent-filter>            <action android:name="android.intent.action.MAIN" />              <category android:name="android.intent.category.LAUNCHER" />        </intent-filter>    </activity></application>  </manifest>
 
ayushpandey3july
Android-View
Kotlin Android
Android
Kotlin
Android
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