Android Slide Up/Down in Kotlin
Last Updated :
23 Feb, 2021
Improve
In Android Animations are the visuals that are added to make the user interface more interactive, clear and good looking.
In this article we will be discussing how to create a Slide Up/Down animation in Kotlin.
First step is to create a new Project in Android Studio. For this follow these steps:
XML
XML
slide_down.xml
XML
Java
XML
| XML Attributes | Description |
|---|---|
| android:duration | It is used to specify the duration of animation |
| android:fromYDelta | It is the change in Y coordinate to be applied at the start of the animation |
| android:toYDelta | It is the change in Y coordinate to be applied at the end of the animation |
| android:id | Sets unique id of the view |
- Click on File, then New and then New Project and give name whatever you like
- Then, select Kotlin language Support and click next button.
- Select minimum SDK, whatever you need
- Select Empty activity and then click finish.
Modify activity_main.xml file
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" android:orientation="vertical">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="GeeksForGeeks"
android:layout_centerInParent="true"
android:textSize="30sp"
android:textStyle="bold" />
<Button
android:id="@+id/slide_up"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="Slide Up"
android:layout_marginTop="140dp"
android:layout_marginLeft="100dp" />
<Button
android:id="@+id/slide_down"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_marginTop="140dp"
android:layout_toRightOf="@+id/slide_up"
android:text="Slide Down"
android:textAllCaps="false" />
</RelativeLayout>
Add anim folder
In this folder, we will be adding the XML files which will be used to produce the animations. For this to happen, go to app/res right click and then select, Android Resource Directory and name it as anim. Again right click this anim folder and select Animation resource file and name it as slide_up. Similarly, also create slide_down.xml and paste the following code. slide_up.xml<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:duration="1000"
android:fromYDelta="0"
android:toYDelta="-100%" />
</set>
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:duration="1000"
android:fromYDelta="-100%"
android:toYDelta="0" />
</set>
Modify MainActivity.kt file
Open app/src/main/java/yourPackageName/MainActivity.kt and do the following changes:package com.geeksforgeeks.myfirstKotlinapp
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.animation.AnimationUtils
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
//setting buttons onClickListener
slide_down.setOnClickListener {
//adding our custom made animation xml file
val animation = AnimationUtils.loadAnimation(
this, R.anim.fade_out)
//appending animation to textView
textView.startAnimation(animation)
}
slide_up.setOnClickListener {
val animation = AnimationUtils.loadAnimation(
this, R.anim.fade_in)
textView.startAnimation(animation)
}
}
}
AndroidManifest.xml file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="i.apps.slideup">
<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>
