Android Image Switcher

Android image switcher provides an animation over images to transition from one image to another. In order to use image switcher, we need to implement ImageSwitcher component in .xml file.

The setFactory() method of ImageSwitcher provide implementation of ViewFactory interface. ViewFactory interface implements its unimplemented method and returns an ImageView.

Example of Image Switcher

Let's implement an image switcher.

Create activity_main.xml and content_main.xml file in layout folder.

Place some images in drawable folder which are to be switch.

activity_main.xml

File: activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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"
    android:fitsSystemWindows="true"
    tools:context="com.example.test.imageswitcher.MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>
    <include layout="@layout/content_main" />

</android.support.design.widget.CoordinatorLayout>

content_main.xml

File: content_main.xml

<?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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.example.test.imageswitcher.MainActivity"
    tools:showIn="@layout/activity_main">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Image Switcher Example"

        android:id="@+id/textView"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

    <ImageSwitcher
        android:id="@+id/imageSwitcher"
        android:layout_width="match_parent"
        android:layout_height="250dp"
        android:layout_marginBottom="28dp"
        android:layout_marginTop="40dp" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Next"
        android:id="@+id/button"
        android:layout_marginBottom="47dp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true" />
</RelativeLayout>

Activity class

File: MainActivity.java

package com.example.test.imageswitcher;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher;

import android.app.ActionBar;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;


public class MainActivity extends AppCompatActivity {
    ImageSwitcher imageSwitcher;
    Button nextButton;

    int imageSwitcherImages[] = 
      {R.drawable.cpp, R.drawable.c_sarp, R.drawable.jsp, R.drawable.mysql, R.drawable.hadoop};

    int switcherImageLength = imageSwitcherImages.length;
    int counter = -1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        imageSwitcher = (ImageSwitcher) findViewById(R.id.imageSwitcher);
        nextButton = (Button) findViewById(R.id.button);

        imageSwitcher.setFactory(new ViewSwitcher.ViewFactory() {
            @Override
            public View makeView() {
                ImageView switcherImageView = new ImageView(getApplicationContext());
                switcherImageView.setLayoutParams(new ImageSwitcher.LayoutParams(
                        ActionBar.LayoutParams.FILL_PARENT, ActionBar.LayoutParams.FILL_PARENT
                ));
                switcherImageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
                switcherImageView.setImageResource(R.drawable.hadoop);
                //switcherImageView.setMaxHeight(100);
                return switcherImageView;
            }
        });

        Animation aniOut = AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right);
        Animation aniIn = AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left);

       imageSwitcher.setOutAnimation(aniOut);
       imageSwitcher.setInAnimation(aniIn);

        nextButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                counter++;
                if (counter == switcherImageLength){
                    counter = 0;
                    imageSwitcher.setImageResource(imageSwitcherImages[counter]);
                }
                else{
                    imageSwitcher.setImageResource(imageSwitcherImages[counter]);
                }
            }
        });
    }

}

Output

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