Android - Pinch Zoom

You will get Final Output:

Step 1 Import needed .jar files

First we need following Jar files imagezoom.jar

Download from the given link: imagezoom.jar

Step 2 Import Java Files

Add jar files to your Android Project from the given Path ProjectName >> libs

Step 3 ImageView_Main.java file

Now Start Coding for the Pinch-Zoom Image. Create new class file named ImageView_Main.java and put following code into class.

public class ImageView_Main extends Activity {
private ImageViewTouch ivLargeImage;
private Bitmap myBitmap;
 
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.image_view);
ivLargeImage = (ImageViewTouch) findViewById(R.id.ivLargeImageView);
 
// if image size is too large.Then scale image.
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
 
                // provide image path for create Bitmap from image.
                // myBitmap = BitmapFactory.decodeFile( //provide here image file path//);
//Or
myBitmap = BitmapFactory.decodeResource(//provider here resource //);
 
if (options.outWidth > 3000 || options.outHeight > 2000) {
options.inSampleSize = 4;
} else if (options.outWidth > 2000 || options.outHeight > 1500) {
options.inSampleSize = 3;
} else if (options.outWidth > 1000 || options.outHeight > 1000) {
options.inSampleSize = 2;
}
options.inJustDecodeBounds = false;
 
myBitmap = BitmapFactory.decodeResource//provider here resource //);
ivLargeImage.setImageBitmapReset(myBitmap, 0, true);
   }
}

Step 4 image_view.xml file

Create image_view.xml file. ImageView Declare as bellow in the image_view.xml file

<com.theappguruz.imagezoom.ImageViewTouch
            android:id="@+id/ivLargeImageView"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_gravity="center" />

I hope you enjoy this tutorial and it would be helpful to you.

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Tejas Jasani

An entrepreneur who has founded 2 flourishing software firms in 7 years, Tejas is keen to understand everything about gaming - from the business dynamics to awesome designs to gamer psychology. As the founder-CEO of a company that has released some very successful games, he knows a thing or two about gaming. He shares his knowledge through blogs and talks that he gets invited to.