MyViewPager

public class MyViewPager extends ViewPager {

  private BgDrawableAdapter mAdapter;
  private Paint mFgPaint;
  private Bitmap mBitmap, mNextBitmap;
  private Paint mBgPaint;
  private int mAlpha;

  public MyViewPager(Context context) {
    super(context);
  }

  public MyViewPager(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
  }

  private void init() {
    setOnPageChangeListener(mListener);
    mBgPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    mFgPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  }

  private int mPosition;
  private float mPositionOffset;
  private OnPageChangeListener mListener = new OnPageChangeListener() {

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
      //Reset bitmaps on page change
      if (mPosition != position) {
        mBitmap = null;
        mNextBitmap = null;
        Log.i(LOG_TAG, "Reset");
      }
      mPosition = position;
      mPositionOffset = positionOffset;
    }

    @Override
    public void onPageSelected(int position) {

    }

    @Override
    public void onPageScrollStateChanged(int state) {

    }
  };

  @Override
  protected void dispatchDraw(Canvas canvas) {
    //Draw Background
    if (mNextBitmap == null && mPositionOffset != 0) {
      BitmapDrawable drawable =
          (BitmapDrawable) getResources().getDrawable(mAdapter.getDrawableResource(mPosition + 1));
      mNextBitmap = drawable.getBitmap();
      Log.i(LOG_TAG, "Created the background");
    }

    if (mNextBitmap != null) {
      canvas.drawBitmap(mNextBitmap, null, canvas.getClipBounds(), mBgPaint);
    }

    //Draw Foreground
    if (mBitmap == null) {
      BitmapDrawable mDrawable =
          (BitmapDrawable) getResources().getDrawable(mAdapter.getDrawableResource(mPosition));
      mBitmap = mDrawable.getBitmap();
      Log.i(LOG_TAG, "Created the foreground");
    }

    mAlpha = (int) ((1 - mPositionOffset) * 255);
    mFgPaint.setAlpha(mAlpha);
    canvas.drawBitmap(mBitmap, null, canvas.getClipBounds(), mFgPaint);

    super.dispatchDraw(canvas);
  }

  @Override
  public void setAdapter(PagerAdapter adapter) {
    if (adapter instanceof BgDrawableAdapter) {
      super.setAdapter(adapter);
      mAdapter = (BgDrawableAdapter) adapter;
    } else {
      throw new IllegalArgumentException("Adapter should implement BgDrawableAdapter");
    }
  }

  public static interface BgDrawableAdapter {
    public int getDrawableResource(int position);
  }
}