How to swipe images

Question

I am trying to implement a simple gallery of images in which I have an image to be displayed at a time on the device screen. When we swipe the screen from left to right it should show the next image.
For that I implemented a view flipper and added image views to it.
But I don't know how to catch that swipe event.
Can anyone tell me with an example?

Answer 1

I needed the same thing for my app, and used a ViewPager: http://blog.sqisland.com/2012/09/android-swipe-image-viewer-with-viewpager.html

Previously I used a ImageSwitcher combined with a GestureDetector: http://blog.sqisland.com/2012/07/android-swipe-image-viewer.html

The code with ViewPager is much simpler, and the experience is much better because the image slides as your finger swipe across the screen. I create ImageView directly, no fragments required.

Answer 2

You can create a custom Pager Adapter for your ViewPager:

public class ImageAdapter extends PagerAdapter {
    private Context context;
    private int[] GalImages = new int[]{
            R.drawable.cap8, R.drawable.cap2, R.drawable.cap3, R.drawable.cap1, R.drawable.cap5,
            R.drawable.cap6, R.drawable.cap7, R.drawable.cap9, R.drawable.cap4,
            R.drawable.cap10

    };

    ImageAdapter(Context context) {
        this.context = context;
    }

    @Override
    public int getCount() {
        return GalImages.length;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        ImageView imageView = new ImageView(context);
        int padding = context.getResources().getDimensionPixelSize(R.dimen.activity_horizontal_margin);
        imageView.setPadding(padding, padding, padding, padding);
        imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
        imageView.setImageResource(GalImages[position]);
        container.addView(imageView, 0);
        return imageView;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((ImageView) object);
    }
}

Use the ViewPager in your layout and register the adapter:

<android.support.v4.view.ViewPager
    android:id="@+id/mvieww"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />