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Output

Tutorialwing Kotlin ViewAnimator Output
Getting Started
Android ViewAnimator can be defined as below –
ViewAnimator is a widget that are used to switch between views using animations.
Different Attributes of Android ViewAnimator Widget
Some of the popular attributes of android ViewAnimator widget are –
Sr. | XML Attributes | Description |
---|---|---|
1 | android:animateFirstView | Specifies whether to animate current view when the viewAnimation is first displayed |
2 | android:inAnimation | Identifier for the animation to use when a view is shown |
3 | android:outAnimation | Identifier for the animation to use when a view is hidden |
Some of the popular attributes of android ViewAnimator inherited from FrameLayout are –
Sr. | XML Attributes | Description |
---|---|---|
1 | android:foregroundGravity | Specifies the gravity to apply for foreground drawable |
2 | android:measureAllChildren | Specifies whether to measure all children or just those in VISIBLE or INVISIBLE state when measuring |
Some of the popular attributes of android ViewAnimator inherited from ViewGroup are –
Sr. | XML Attributes | Description |
---|---|---|
1 | android:splitMotionEvents | Specifies this viewGroup should split MotionEvents to separate child views during touch event dispatch |
2 | android:persistentDrawingCache | Specifies persistence of the drawing cache |
3 | android:layoutMode | Specifies layout mode of this viewGroup |
4 | android:layoutAnimation | Specifies the layout animation to be used when this viewGroup is laid out for the first time |
5 | android:clipToPadding | Specifies whether the ViewGroup will clip its children and resize (but not clip) any EdgeEffect to its padding, if padding is not zero. |
Some of the popular attributes of android ViewAnimator inherited from View are –
Sr. | XML Attributes | Description |
---|---|---|
1 | android:background | Specifies drawable of the background |
2 | android:backgroundTint | Specifies tint to apply to the background |
3 | android:backgroundTintMode | Specifies blending mode to be used to apply tint to the background |
4 | android:clickable | Specifies whether this view is clickable or not |
5 | android:id | Specifies unique id of the view |
6 | android:onClick | Specifies what to do when this view is clicked |
7 | android:padding | Specifies padding of the view |
8 | android:visibility | Specifies visibility(VISIBLE, INVISIBLE or GONE) of the view |
Example of Android ViewAnimator Using Kotlin
At first, we will create android application. Then, we will use viewAnimator using kotlin in the application.
1. Creating New Project in Kotlin
Follow steps below to create new project. Please ignore the steps if you have already created the project.
Step | Description |
---|---|
1. | Open Android Studio. |
2. | Go to File => New => New Project. Write application name as ViewAnimator. 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. | You will get a newly created project successfully if you have followed steps properly. |
Since we have a project now, we will modify xml and other files to use viewAnimator using kotlin in the application.
2. Modify values folder
Open res/values/strings.xml file. Then, add below code into it.
<resources> <string name="app_name">ViewAnimator</string> <string name="next">Next</string> <string name="prev">Previous</string> <string name="item_post_1">Text at position 1</string> <string name="item_post_2">Button at position 2</string> <string name="item_post_4">Text at positon 4</string> </resources>
3. Use ViewAnimator Widget in xml file
Open src/main/res/layout/activity_main.xml file and 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:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:orientation="horizontal" android:padding="10dp"> <Button android:id="@+id/buttonPrev" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/prev"/> <Button android:id="@+id/buttonNext" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/next"/> </LinearLayout> <ViewAnimator android:id="@+id/viewAnimator" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:text="@string/item_post_1" android:textColor="@android:color/holo_red_dark" android:textSize="20sp"/> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:text="@string/item_post_2"> </Button> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:src="@mipmap/ic_launcher"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:text="@string/item_post_4" android:textColor="@android:color/holo_red_dark" android:textSize="20sp"/> </ViewAnimator> </LinearLayout>
In activity_main.xml file, we have two buttons and ViewAnimator. ViewAnimator contains four child views(TextView, Button, ImageView and TextView). At a time, only one view is shown in viewAnimator. You can switch between views, using viewAnimator, with animation. Now, we will access these widgets in kotlin file to perform some actions on it.
4. Access ViewAnimator Widget in Kotlin file
Open src/main/java/com.tutorialwing.viewanimator/MainActivity.kt file and add below code into it.
package com.tutorialwing.viewanimator import android.os.Bundle import android.support.v7.app.AppCompatActivity import android.view.animation.AnimationUtils import android.widget.Button import android.widget.ViewAnimator class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val animator = findViewById<ViewAnimator>(R.id.viewAnimator) val animationIn = AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left) val animationOut = AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right) animator.inAnimation = animationIn animator.outAnimation = animationOut val buttonPrev = findViewById<Button>(R.id.buttonPrev) buttonPrev.setOnClickListener { animator.showPrevious() } val buttonNext = findViewById<Button>(R.id.buttonNext) buttonNext.setOnClickListener { animator.showNext() } } }
We have accessed viewAnimator using kotlin file (i.e. MainActivity.kt file). Then, we have set in and out animations that are applied when current view is replaced by either previous view or next view. Then, we have set click listener on buttons (Prev and Next buttons) that shows previous/next view in viewAnimator respectively.
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 main/AndroidManifest.xml file is as below.
<?xml version="1.0" encoding="utf-8"?> <manifest package="com.tutorialwing.viewanimator" 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 Android ViewAnimator using Kotlin.