Swipe Image Viewer in Android

See more basics on Android along with interview questions

public class MainActivity extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ViewPager viewPager = (ViewPager)findViewById(R.id.view_pager);
    ImagePagerAdapter adapter = new ImagePagerAdapter();
    viewPager.setAdapter(adapter);
  }
  private class ImagePagerAdapter extends PagerAdapter {
    private int[] mImages = new int[] {
        R.drawable.chiang_mai,
        R.drawable.himeji,
        R.drawable.petronas_twin_tower,
        R.drawable.ulm
    };
    @Override
    public int getCount() {
      return mImages.length;
    }
    @Override
    public boolean isViewFromObject(View view, Object object) {
      return view == ((ImageView) object);
    }
    @Override
    public Object instantiateItem(ViewGroup container, int position) {
      Context context = MainActivity.this;
      ImageView imageView = new ImageView(context);
      int padding = context.getResources().getDimensionPixelSize(
          R.dimen.padding_medium);
      imageView.setPadding(padding, padding, padding, padding);
      imageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
      imageView.setImageResource(mImages[position]);
      ((ViewPager) container).addView(imageView, 0);
      return imageView;
    }
    @Override
    public void destroyItem(ViewGroup container, int position,Object object) {
      ((ViewPager) container).removeView((ImageView) object);
    }
  }
}