Hello Readers! In this post, we are going to learn how to create and use android viewFlipper programmatically in any android application. We will also learn to add viewFlipper in linearLayout programmatically in any application.

Output

Tutorialwing Android Dynamic ViewFlipper Output

Getting Started

At first, we will create an android application. Then, we will use viewFlipper widget in the application.

1. Creating New Project

Follow the steps below to create a new project. Please ignore the steps if you have already created a new project.

Now, we will modify xml and java file to use android viewFlipper programmatically.

2. Modify values folder

Open res/values/strings.xml file and add below code into it.

<resources>
	<string name="app_name">DynamicViewFlipper</string>
	<string name="pause">Pause</string>
	<string name="play">Play</string>
	<string name="flipping_started">Flipping Started...</string>
	<string name="flipping_stopped">Flipping Stopped...</string>
</resources>

3. Download Drawable Resources Needed

You need some images, stored in res/drawable folder, to be used by the viewFlipper created programmatically in the application. You may click here to download images used in the application.

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
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:orientation="vertical">

	<Button
		android:id="@+id/playPause"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_gravity="center_horizontal"
		android:layout_marginTop="15dp"
		android:text="Pause"/>


	<LinearLayout
		android:id="@+id/rootContainer"
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		android:orientation="horizontal">

	</LinearLayout>

</LinearLayout>

We have defined linearLayout, with id rootContainer, that will act as container for the viewFlipper created programmatically in the application.

5. Create Android ViewFlipper Programmatically / Dynamically

Open app/src/main/java/com.tutorialwing.dynamicviewflipper/MainActivity.java file and add below code into it.

package com.tutorialwing.dynamicviewflipper;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;
import android.widget.ViewFlipper;

public class MainActivity extends AppCompatActivity {

	int[] imageList = {R.drawable.guava, R.drawable.jackfruit, R.drawable.mix_fruit,
			R.drawable.pomegranate, R.drawable.strawberry, R.drawable.zespri_kiwi};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		final ViewFlipper viewFlipper = new ViewFlipper(this);
		LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
		layoutParams.setMargins(30, 30, 30, 30);
		layoutParams.gravity = Gravity.CENTER;
		viewFlipper.setLayoutParams(layoutParams);
		viewFlipper.setFlipInterval(2000);
		viewFlipper.setAutoStart(true);

		viewFlipper.setInAnimation(this, android.R.anim.slide_in_left);
		viewFlipper.setOutAnimation(this, android.R.anim.slide_out_right);

		for (int image : imageList) {
			ImageView imageView = new ImageView(this);
			FrameLayout.LayoutParams params =
					new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
			params.setMargins(30, 30, 30, 30);
			params.gravity = Gravity.CENTER;
			imageView.setLayoutParams(params);
			imageView.setImageResource(image);
			viewFlipper.addView(imageView);
		}

		final Button btnPlayPause = findViewById(R.id.playPause);
		if (btnPlayPause != null) {
			btnPlayPause.setOnClickListener(new View.OnClickListener() {
				@Override
				public void onClick(View v) {
					if (viewFlipper.isFlipping())
						viewFlipper.stopFlipping();
					else
						viewFlipper.startFlipping();

					btnPlayPause.setText(getString(viewFlipper.isFlipping() ? R.string.pause : R.string.play));
					Toast.makeText(MainActivity.this, getString(viewFlipper.isFlipping() ? R.string.flipping_started : R.string.flipping_stopped), Toast.LENGTH_SHORT).show();
				}
			});
		}

		LinearLayout linearLayout = findViewById(R.id.rootContainer);
		if (linearLayout != null) {
			linearLayout.addView(viewFlipper);
		}
	}
}

We have created viewFlipper using kotlin file (i.e. in MainActivity.kt file) in the application. Then, we have set layout params, margins etc. in it. setFlipInterval() method sets the time interval after which view will be flipped. setAutoStart() method specifies whether view should be automatically flipped or not. If set true, it means view will be flipped automatically. Then, we have set in and out animation in viewFlipper that are used when view is shown or hidden. After that, we have created ImageViews that are equal to length of imageList array. We have added these imageViews into viewFlipper widget. Then, we have set click listener in button that play/pause view flipping in viewFlipper. We are also showing toast message that displays current status of the viewFlipper (i.e. whether view in viewFlipper is flipping or not). At last, we have added this viewFlipper into linearLayout having id rootContainer.

Since AndroidManifest.xml file is very important in any android project. We are also going to see the content inside this file.

AndroidManifest.xml file

Code inside src/main/AndroidManifest.xml file would look like below –

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.tutorialwing.dynamicviewflipper"
		  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 application, we will get output as shown above.

That’s the end of tutorial on Creating Android ViewFlipper Programmatically.