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Output

Tutorialwing Kotlin Dynamic ViewStub Output
Getting Started
At first, we will create android project. Then, we will create and use viewStub programmatically in kotlin file.
1. Creating New Project in Kotlin
Follow the steps below to create new project. Please ignore the steps if you have already created a new project.
Step | Description |
---|---|
1. | Open Android Studio. |
2. | Go to File => New => New Project. Write application name as DynamicViewStub. Then, check Include Kotlin Support and click next button. |
3. | Select minimum SDK you need. However, we have selected 17 as minimum SDK. Then, click next button |
4. | Then, select Empty Activity => click next => click finish. |
5. | At this point, You will get a newly created android project successfully. |
Now, we will modify xml and kotlin file to use viewStub dynamically.
2. Modify Values Folder
Open res/values/strings.xml file. Then, add below code into it.
<resources> <string name="app_name">DynamicViewStub</string> <string name="hide">HIDE</string> <string name="show">SHOW</string> <string name="sub_view">This view is inflated by ViewStub by calling either inflate() or setVisibility(true) method</string> </resources>
3. Create Views That replaces ViewStub On inflate() Call
Now, we will create an xml file, named sub_item.xml, that are inflated when viewStub.inflate() method is called. Then, add below code into it.
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@android:color/holo_blue_light" android:gravity="center" android:padding="10dp"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:text="@string/sub_view" android:textColor="@android:color/black" android:textSize="18sp"/> </LinearLayout>
4. Modify Layout Folder
Open res/layout/activity_main.xml file. Then, add below code into it.
<?xml version="1.0" encoding="utf-8"?> <LinearLayout android:id="@+id/rootContainer" xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_margin="10dp" android:gravity="center_horizontal" android:orientation="vertical"> <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hide"/> </LinearLayout>
In activity_main.xml file, we have defined a linearLayout, with id rootContainer, that acts as container for the viewStub created programmatically in the application.
5. Create Android ViewStub Programmatically / Dynamically in Kotlin
Open app/src/main/java/com.tutorialwing.dynamicviewstub/MainActivity.kt file. Then, add below code into it.
package com.tutorialwing.dynamicviewstub import android.os.Bundle import android.support.v7.app.AppCompatActivity import android.view.View import android.view.ViewGroup import android.view.ViewStub import android.widget.Button import android.widget.LinearLayout class MainActivity : AppCompatActivity() { private var isViewInflated = true // Default state that represents viewStub has been replaced by sub view override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val viewStub = ViewStub(this) val layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT) viewStub.layoutParams = layoutParams viewStub.layoutResource = R.layout.sub_item val linearLayout = findViewById<LinearLayout>(R.id.rootContainer) linearLayout?.addView(viewStub) viewStub.visibility = View.VISIBLE // or you can use viewStub.inflate() val button = findViewById<Button>(R.id.button) button?.setOnClickListener { isViewInflated = !isViewInflated viewStub.visibility = if (isViewInflated) View.VISIBLE else View.GONE button.text = if (isViewInflated) getString(R.string.hide) else getString(R.string.show) } } }
We have created viewStub programmatically in kotlin file (i.e. in MainActivity.kt file). Then, we have set layout params etc. in it. Attribute layoutResource is used to specify layout resource that replaces viewStub on inflate() method call. After that, we have added viewStub in linearLayout having id rootContainer. Finally, we have set click listener on button to toggle visibility of inflated view by viewStub.
Since AndroidManifest.xml file is very important in any android application, we are also going to see the content inside this file.
AndroidManifest.xml file
Code inside src/main/AndroidManifest.xml file is –
<?xml version="1.0" encoding="utf-8"?> <manifest package="com.tutorialwing.dynamicviewstub" xmlns:android="http://schemas.android.com/apk/res/android"> <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>
When we run the program, we will get output as shown above.
That’s end of our tutorial on Creating Android ViewStub Programmatically in Kotlin.