Android ImageSwitcher Tutorial with Examples
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This is an application that uses ImageSwitcher:
- TODO: More infos
Create a project named AndroidImageSwitcher:
- File > New Project > Empty Activity
You need some images participate in the examples:
| image1.png |  |
| image2.png |  |
| image3.png |  |
Copy the images above into drawable folder.
Application interface:
If you are interested in the steps to design the interface of this application, please see the appendix at the end of the article.
main_actvity.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
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"
tools:context=".MainActivity">
<ImageSwitcher
android:id="@+id/imageSwitcher"
android:layout_width="0dp"
android:layout_height="279dp"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="27dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:orientation="horizontal"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imageSwitcher">
<Space
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1" />
<Button
android:id="@+id/button_previous "
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:text="Previous" />
<Button
android:id="@+id/button_next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:text="Next" />
<Space
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java
package org.o7planning.androidimageswitcher;
import android.os.Bundle;
import android.app.ActionBar.LayoutParams;
import android.graphics.Color;
import android.util.Log;
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.Toast;
import android.widget.ViewSwitcher.ViewFactory;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private ImageSwitcher imageSwitcher;
private Button buttonPrevious;
private Button buttonNext;
private final String[] imageNames={"image1", "image2", "image3"};
private int currentIndex;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonPrevious = (Button) findViewById(R.id.button_previous);
buttonNext = (Button) findViewById(R.id.button_next);
imageSwitcher = (ImageSwitcher) findViewById(R.id.imageSwitcher);
// Animation when switching to another image.
Animation out= AnimationUtils.loadAnimation(this, android.R.anim.fade_out);
Animation in= AnimationUtils.loadAnimation(this, android.R.anim.fade_in);
// Set animation when switching images.
imageSwitcher.setInAnimation(in);
imageSwitcher.setOutAnimation(out);
//
imageSwitcher.setFactory(new ViewFactory() {
// Returns the view to show Image
// (Usually should use ImageView)
@Override
public View makeView() {
ImageView imageView = new ImageView(getApplicationContext());
imageView.setBackgroundColor(Color.LTGRAY);
imageView.setScaleType(ImageView.ScaleType.CENTER);
ImageSwitcher.LayoutParams params= new ImageSwitcher.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
imageView.setLayoutParams(params);
return imageView;
}
});
this.currentIndex=0;
this.showImage(this.currentIndex);
buttonPrevious.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
previousImage();
}
});
buttonNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
nextImage();
}
});
}
private void previousImage() {
if(currentIndex > 0) {
currentIndex--;
}else {
Toast.makeText(getApplicationContext(), "No Previous Image", Toast.LENGTH_SHORT).show();
return;
}
this.showImage(currentIndex);
}
private void nextImage() {
if(currentIndex < this.imageNames.length-1) {
currentIndex++;
}else {
Toast.makeText(getApplicationContext(), "No Next Image", Toast.LENGTH_SHORT).show();
return;
}
this.showImage(currentIndex);
}
private void showImage(int imgIndex) {
String imageName= this.imageNames[imgIndex];
int resId= getDrawableResIdByName(imageName);
if(resId!= 0) {
this.imageSwitcher.setImageResource(resId);
}
}
// Find Image ID corresponding to the name of the image (in the drawable folder).
public int getDrawableResIdByName(String resName) {
String pkgName = this.getPackageName();
// Return 0 if not found.
int resID = this.getResources().getIdentifier(resName , "drawable", pkgName);
Log.i("MyLog", "Res Name: " + resName + "==> Res ID = " + resID);
return resID;
}
}
Running the apps:
I don't know why ImageSwitcher is not available on design window of Android Studio 3.6.x, so you can't drag it into the interface. The best way is to add the following XML code to the activity_main.xml file and you will get ImageSwitcher on the interface.
<ImageSwitcher
android:layout_width="100dp"
android:layout_height="100dp" />
Set ID, Text for components on the interface.
*
