Update: the source code has moved to github, so it’s easier for anyone to fork it!

As long as Android doesn’t have a built-in ImageView widget with zoom and scroll capabilities I tries to create one by myself starting from the google repository.

The result is pretty nice so I’m posting here the source code, if anyone is interested, or simply doesn’t want to waste the time creating a new one.

Here’s a sample code on how to use it in an Activity:

Anyway, if you want to download the source, here is the eclipse source project:
https://blog.sephiroth.it/wp-…/ImageZoom.zip
https://github.com/sephiroth74/ImageViewZoom

package it.sephiroth.android.demo;
import it.sephiroth.android.library.imagezoom.ImageViewTouch;
import java.io.IOException;
import android.app.Activity;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore.Images;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Toast;
public class ImageZoomActivity extends Activity {
	private ImageViewTouch mImageView;
	@Override
	protected void onCreate( Bundle savedInstanceState )
	{
		super.onCreate( savedInstanceState );
		requestWindowFeature( Window.FEATURE_NO_TITLE );
		setContentView( R.layout.main );
		getWindow().addFlags( WindowManager.LayoutParams.FLAG_FULLSCREEN );
		selectRandomImage();
	}
	@Override
	public void onContentChanged()
	{
		super.onContentChanged();
		mImageView = (ImageViewTouch)findViewById( R.id.imageView1 );
	}
	/**
	 * pick a random image from your library
	 * and display it
	 */
	public void selectRandomImage()
	{
		Cursor c = getContentResolver().query( Images.Media.EXTERNAL_CONTENT_URI, null, null, null, null );
		if ( c != null ) {
			int count = c.getCount();
			int position = (int)( Math.random() * count );
			if ( c.moveToPosition( position ) ) {
				long id = c.getLong( c.getColumnIndex( Images.Media._ID ) );
				int orientation = c.getInt( c.getColumnIndex( Images.Media.ORIENTATION ) );
				Uri imageUri = Uri.parse( Images.Media.EXTERNAL_CONTENT_URI + "/" + id );
				Bitmap bitmap;
				try {
					bitmap = ImageLoader.loadFromUri( this, imageUri.toString(), 1024, 1024 );
					mImageView.setImageBitmapReset( bitmap, orientation, true );
				} catch ( IOException e ) {
					Toast.makeText( this, e.toString(), Toast.LENGTH_LONG ).show();
				}
			}
			c.close();
			c = null;
			return;
		}
	}
}