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

Output

Tutorialwing Android Dynamic ImageSwitcher Output

Getting Started

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

2. Modify values folder

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

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

3. 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/button"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_gravity="center"
		android:layout_marginTop="40dp"
		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 button and linearLayout, with id rootContainer, that will act as container for imageSwitcher widget created programmatically in the application.

4. Create Android ImageSwitcher Programmatically / Dynamically

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

package com.tutorialwing.dynamicimageswitcher;

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

public class MainActivity extends AppCompatActivity {

	int[] nameList = {R.drawable.chinchilla,
			R.drawable.cod,
			R.drawable.crane,
			R.drawable.crocodile,
			R.drawable.deer,
			R.drawable.dog,
			R.drawable.dolphin,
			R.drawable.dove,
			R.drawable.eel,
			R.drawable.elephant,
			R.drawable.emu,
			R.drawable.fly
	};

	private int index = 0;

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

		final ImageSwitcher imageSwitcher = new ImageSwitcher(this);
		LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(900, 900);
		layoutParams.setMargins(20, 20, 20, 20);
		imageSwitcher.setLayoutParams(layoutParams);

		imageSwitcher.setFactory(new ViewSwitcher.ViewFactory() {
			public View makeView() {
				ImageView imageView = new ImageView(getApplicationContext());
				imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
				imageView.setLayoutParams(new ImageSwitcher.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
				return imageView;
			}
		});

		imageSwitcher.setImageResource(nameList[index]);

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

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

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

		Button button = findViewById(R.id.button);
		if (button != null) {
			button.setOnClickListener(new View.OnClickListener() {
				@Override
				public void onClick(View v) {
					index = (++index < nameList.length) ? index : 0;
					imageSwitcher.setImageResource(nameList[index]);
				}
			});
		}
	}
}

You need some drawable images for imageSwitcher in the application. You can click here to download image resources for this project.

In MainActivity.java file, we have created imageSwitcher widget. Then, we have set layout params, margins etc. in it. After that, we have set factory for imageSwitcher that defines the different views for imageSwitcher between which imageSwitcher flips. Also, we have set animations to be shown when view is appearing/disappearing on/from the screen. After that, we have added this view in linearLayout, having id rootContainer. After that, we have set click listener on button to show next images in imageSwitcher.

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.dynamicimageswitcher"
		  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 ImageSwitcher Programmatically.