gistfile1.java

public class Page {

	PageObservable mPageObservable = new PageObservable();

	private Context mContext;
	private ViewGroup mParent;
	private View mView;
	private int mID;
	private boolean mIsInFront;

	public Page(Context context, ViewGroup parent) {
		mContext = context;
		mParent = parent;
		mIsInFront = false;
	}

	public int getId() {
		return mID;
	}

	public void setId(int id) {
		mID = id;
	}

	public void setContentView(int resId) {
		setContentView(getLayoutInflater().inflate(resId, mParent, false));
	}

	public void setContentView(View view) {
		mView = view;
		mID = mView.getId();
	}

	public Context getContext() {
		return mContext;
	}

	public View getView() {
		return mView;
	}

	public View findViewById(int resId) {
		if (mView != null)
			return mView.findViewById(resId);
		return null;
	}

	public LayoutInflater getLayoutInflater() {
		return (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	}

	public void registerPageObserver(PageObserver observer) {
		mPageObservable.registerObserver(observer);
	}

	public void unregisterPageObserver(PageObserver observer) {
		mPageObservable.unregisterObserver(observer);
	}

	public void notifyPageChanged() {
		mPageObservable.notifyPageChanged();
	}

	public void onSaveInstanceState(Bundle bundle) {
		SparseArray<Parcelable> container = new SparseArray<Parcelable>();
		mView.saveHierarchyState(container);
		bundle.putSparseParcelableArray("view-state", container);
	}

	public void onRestoreInstanceState(Bundle bundle) {
		SparseArray<Parcelable> container = bundle.getSparseParcelableArray("view-state");
		mView.restoreHierarchyState(container);
	}

	public void onAppear() {
		mIsInFront = true;
	}

	public void onDisappear() {
		mIsInFront = false;
	}
	
	public boolean isInFront() {
		return mIsInFront;
	}
}