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<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.my.whatever"
          xmlns:android="http://schemas.android.com/apk/res/android">
  
    <uses-permission android:name="com.android.vending.BILLING"/>

    <application>
        <activity
            android:name=".IapDelegateActivity"
            android:theme="@style/AppTheme.Invisible">

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// Example 1, from an android.app.Activity: 
// Use the startActivityForResult(Intent, int) and subscribe
// the result in onActivityResult(int, int, Intent).
startActivityForResult(
    new Intent(this, IapDelegateActivity.class)
        .putExtra(IapDelegateActivity.PARAMS_SKU, "sku")
        .putExtra(IapDelegateActivity.PARAMS_SKU_PRICE, 1.99f));
   
// Example 2, from a android.app.Service:
// Use the startActivity(Intent) and subscribe the result in

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// Copyright (c) 2017-present boyw165
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
//    The above copyright notice and this permission notice shall be included in

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private void cancelChildrenTouchEvent(MotionEvent event) {
    // MotionEvent.obtain creates a new MotionEvent`, copying from an existing one.
    final MotionEvent canceledEvent = MotionEvent.obtain(event);

    // The event was handled by the certain child view. In order to make the touch event
    // lifecycle complete, we have to fake a ACTION_CANCEL for the child view.
    // Otherwise, it would be chaos.
    canceledEvent.setAction(MotionEvent.ACTION_CANCEL);
    super.dispatchTouchEvent(canceledEvent);
    canceledEvent.recycle();

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private void cancelSelfTouchEvent(MotionEvent event) {
    final MotionEvent canceledEvent = MotionEvent.obtain(event);

    canceledEvent.setAction(MotionEvent.ACTION_CANCEL);
    onTouchEvent(canceledEvent);
    canceledEvent.recycle();
}

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public interface NestedScrollingChild {
    /**
     * Begin a nestable scroll operation along the given axes.
     *
     * @param axes Flags consisting of a combination of {@link ViewCompat#SCROLL_AXIS_HORIZONTAL}
     *             and/or {@link ViewCompat#SCROLL_AXIS_VERTICAL}.
     * @return true if a cooperative parent was found and nested scrolling has been enabled for
     *         the current gesture.
     */
    public boolean startNestedScroll(int axes);

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public class CoordinatorLayout extends ViewGroup
    implements NestedScrollingParent {

    @Override
    public void onNestedScroll(View target, int dxConsumed, int dyConsumed,
            int dxUnconsumed, int dyUnconsumed) {
        final int childCount = getChildCount();
        boolean accepted = false;

        for (int i = 0; i < childCount; i++) {

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@Override
public void onBindViewHolder(final RecyclerView.ViewHolder viewHolder,
                             final int position,
                             List<Object> payloads) {
    final ImageView imageView = (ImageView) viewHolder.itemView;
    final IPhoto photo = getPhotoAt(position);

    Glide.with(getContext())
         .load(photo.thumbnailPath())
         // Setting the placeholder will fix the "ghost images" problem.

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public abstract class CursorRecyclerViewAdapter<VH extends RecyclerView.ViewHolder>
    extends RecyclerView.Adapter<VH> {

    final private WeakReference<Context> mContext;
    final private WeakReference<LayoutInflater> mInflater;

    private RecyclerView mRecyclerView;
    private Cursor mCursor;

    // State.

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/**
 * Change the underlying cursor to a new cursor. If there is an existing
 * cursor it will be closed.
 */
public void setData(Cursor cursor) {
    Cursor old = swapCursor(cursor);
    if (old != null && !old.isClosed()) {
        old.close();
    }
}