GestureImageView

This library has copied from Jason Polites's gesture-imageview repository, fixed couple of bugs and merged with pull requests from other users.

This is a simple Android View class which provides basic pinch and zoom capability for images.

Can be used as a replacement for a standard ImageView when you want to include pinch and zoom.

Gradle

Add dependency in your build.gradle

implementation 'com.cuneytayyildiz:gestureimageview:1.0.0'

Features:

Pinch zoom in place (i.e. zoom occurs from point of touch)
Panning with fling gesture
Double tap zoom
Configurable zoom boundaries (min/max)

Limitations:

Does not support Rotation
Does not support Pan and Zoom together
Not all methods of ImageView class are supported (will throw UnsupportedOperationException if strict is true)

Notes:

Setting gesture-image:strict to true will result in UnsupportedOperationException if an unsupported method is called. Default value: false
Setting gesture-image:recycle to true will automatically reycle bitmap images when the view is destroyed. Default value: false

Usage

Configured as View in layout.xml

	<LinearLayout 
	    xmlns:android="http://schemas.android.com/apk/res/android"
	    xmlns:app="http://schemas.polites.com/android"
	    android:layout_width="fill_parent"
	    android:layout_height="fill_parent">

	    <com.cuneytayyildiz.gestureimageview.GestureImageView
	      android:id="@+id/image"
	      android:layout_width="fill_parent"
	    	android:layout_height="wrap_content" 
	    	android:src="@drawable/image"
	    	app:gi_min_scale="0.1"
	    	app:gi_max_scale="10.0"
	    	app:gi_strict="false"/>
	    	
	</LinearLayout>

Configured Programmatically

	import com.cuneytayyildiz.gestureimageview.GestureImageView;
	
	import android.app.Activity;
	import android.os.Bundle;
	import android.view.ViewGroup;
	import android.widget.LinearLayout.LayoutParams;
	
	public class SampleActivity extends AppCompatActivity {
	    @Override
	    public void onCreate(Bundle savedInstanceState) {
	        super.onCreate(savedInstanceState);
	        setContentView(R.layout.main);
	        
	        LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
	        
	        GestureImageView view = new GestureImageView(this);
	        view.setImageResource(R.drawable.image);
	        view.setLayoutParams(params);
	        
	        ViewGroup layout = (ViewGroup) findViewById(R.id.layout);
	
	        layout.addView(view);
	    }
	}