Add and Remove Views in Android Dynamically in Kotlin?

This example demonstrates how to Add and Remove Views in Android Dynamically in Kotlin.

Step 1 − Create a new project in Android Studio, go to File ? New Project and fill all required details to create a new project.

Step 2  − Add the following code to res/layout/activity_main.xml.

Example

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/parent_linear_layout"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:layout_margin="5dp"    android:orientation="vertical"    tools:context=".MainActivity">    <LinearLayout       android:layout_width="match_parent"       android:layout_height="50dp"       android:orientation="horizontal">       <EditText          android:layout_width="0dp"          android:layout_height="match_parent"          android:layout_weight="5"          android:inputType="phone" />       <Spinner          android:layout_width="0dp"          android:layout_height="wrap_content"          android:layout_weight="3"          android:entries="@array/types"          android:gravity="right" />       <Button          android:layout_width="0dp"          android:layout_height="40dp"          android:layout_weight="1"          android:background="@android:drawable/ic_delete"         android:onClick="onDelete" />    </LinearLayout> <Button     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_gravity="center"     android:onClick="onAddField"     android:text="Add Field"     android:textColor="@android:color/background_dark" /> </LinearLayout>

Step 3 − Add the following code to src/MainActivity.kt

Example

import android.content.Context import android.os.Bundle import android.view.LayoutInflater import android.view.View import android.widget.LinearLayout import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    private var parentLinearLayout: LinearLayout? = null    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)       title = "KotlinApp"       parentLinearLayout = findViewById(R.id.parent_linear_layout)    }    fun onDelete(view: View) {       parentLinearLayout!!.removeView(view.parent as View)    }    fun onAddField(view: View) {       val inflater =       getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater       val rowView: View = inflater.inflate(R.layout.field, null)       parentLinearLayout!!.addView(rowView, parentLinearLayout!!.childCount - 1)    } }

Step 4 − Create a new Layout Resource file (field.xml) and add the following code −

Example

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="50dp"    android:orientation="horizontal">    <EditText       android:id="@+id/number_edit_text"       android:layout_width="0dp"       android:layout_height="match_parent"       android:layout_weight="5"       android:inputType="phone" />    <Spinner       android:id="@+id/type_spinner"       android:layout_width="0dp"       android:layout_height="wrap_content"       android:layout_weight="3"       android:entries="@array/types"       android:gravity="right" /> <Button     android:id="@+id/delete_button"     android:layout_width="0dp"     android:layout_height="40dp"     android:layout_weight="1"     android:background="@android:drawable/ic_delete"     android:onClick="onDelete" /> </LinearLayout>

Step 5 − Open res/values/strings.xml and add the following code −

Example

<resources> <string name="app_name">YourAppName</string>    <string-array name="types">       <item>Mobile</item>       <item>Office</item>       <item>Home</item>    </string-array> </resources>

Step 6 − Add the following code to androidManifest.xml

example

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.q1">    <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>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run   icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen