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

Output

Tutorialwing Android Dynamic ViewSwitcher Output

Getting Started

At first, we will create an android application. Then, we will use viewSwitcher 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 viewSwitcher programmatically.

2. Modify values folder

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

<resources>
	<string name="app_name">DynamicViewSwitcher</string>
	<string name="next">Next</string>
</resources>

3. Downloaded Drawable Resources Needed

You need images, stored in res/drawable folder, that are needed in the application. These drawable images will be used by viewSwitcher created dynamically 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/btnNext"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_gravity="center"
		android:layout_margin="20dp"
		android:text="@string/next"/>

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

	</LinearLayout>

</LinearLayout>

In activity_main.xml file, we have defined linearLayout, with id rootContainer, that will act as container for the viewSwitcher widget created programmatically in the application.

5. Create Android ViewSwitcher Programmatically / Dynamically

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

package com.tutorialwing.dynamicviewswitcher;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ViewSwitcher;

public class MainActivity extends AppCompatActivity {

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

		final ViewSwitcher viewSwitcher = new ViewSwitcher(this);
		LinearLayout.LayoutParams layoutParams =
				new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
		viewSwitcher.setLayoutParams(layoutParams);

		Animation in = AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left);
		viewSwitcher.setInAnimation(in);

		Animation out = AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right);
		viewSwitcher.setOutAnimation(out);

		ImageView imageView1 = new ImageView(this);
		LinearLayout.LayoutParams params1 = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
		imageView1.setLayoutParams(params1);
		imageView1.setImageResource(R.drawable.pomegranate);

		ImageView imageView2 = new ImageView(this);
		LinearLayout.LayoutParams params2 = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
		imageView2.setLayoutParams(params2);
		imageView2.setImageResource(R.drawable.zespri_kiwi);

		viewSwitcher.addView(imageView1);
		viewSwitcher.addView(imageView2);

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

		Button btnNext = findViewById(R.id.btnNext);
		if (btnNext != null) {
			btnNext.setOnClickListener(new View.OnClickListener() {
				@Override
				public void onClick(View v) {
					viewSwitcher.showNext();
				}
			});
		}
	}
}

In MainActivity.java file, we have done below things –
a. We have created viewSwitcher programmatically. Then, we have set layout params in it. After that, we have set in and out animations in it.
b. Then, we have created two imageViews that will be added as child views in viewSwitcher widget.
c. Then, we have set viewSwitcher into linearLayout having id rootContainer.
d. After that, we have set click listener in button that shows next view in viewSwitcher widget.

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.dynamicviewswitcher"
		  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 ViewSwitcher Programmatically.