Android Slide Up/Down in Kotlin - GeeksforGeeks

23 Feb, 2021
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:
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.
After that, we need to design our layout. For that we need to work with the XML file. Go to app > res > layout and paste the following code:
<?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>
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>
slide_down.xml
<?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>
Open app/src/main/java/yourPackageName/MainActivity.kt and do the following changes:
package com.geeksforgeeks.myfirstKotlinapp  import androidx.appcompat.app.AppCompatActivityimport android.os.Bundleimport android.view.animation.AnimationUtilsimport 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)        }    }}
<?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>
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