GestureImageView

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.

Features:

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

Limitations:

1. Does not support Rotation
2. Does not support Pan and Zoom together
3. Only supports Bitmap objects and image resources (i.e. does not support setting a Drawable that is NOT a bitmap/png/jpg)
4. Not all methods of ImageView class are supported (will throw UnsupportedOperationException if strict is true)

Usage

Notes:

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

Configured as View in layout.xml

code:

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

    <com.polites.android.GestureImageView
        android:id="@+id/image"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:src="@drawable/image"
        gesture-image:min-scale="0.1"
        gesture-image:max-scale="10.0"
        gesture-image:strict="false"
        gesture-image:recycle="true"/>

</LinearLayout>

Configured Programmatically

code:

import com.polites.android.GestureImageView;

import android.app.Activity;
import android.os.Bundle;
import android.view.ViewGroup;
import android.widget.LinearLayout.LayoutParams;

public class SampleActivity extends Activity {
    @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);
    }
}

License

Apache License 2.0