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    private void addPageTurnButton() {
        View view = getLayoutInflater().inflate(R.layout.widget_page_turn, null);

        /*
        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT,
                RelativeLayout.LayoutParams.WRAP_CONTENT);
        params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
        view.setLayoutParams(params);

        RelativeLayout rootLayout = (RelativeLayout) findViewById(R.id.rootLayout);
        rootLayout.addView(view);
        */

        // android.support.v7.widget.ContentFrameLayout cannot be cast to android.widget.RelativeLayout


        FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(
                FrameLayout.LayoutParams.WRAP_CONTENT,
                FrameLayout.LayoutParams.WRAP_CONTENT);
        params.gravity = Gravity.RIGHT;
        view.setLayoutParams(params);
        view.bringToFront();

        FrameLayout rootLayout = (FrameLayout) findViewById(R.id.contentFragmentContainer);
        rootLayout.addView(view);

        Button pageUpButton = (Button) view.findViewById(R.id.widgetPageUp);
        pageUpButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });

        Button pageDownButton = (Button) view.findViewById(R.id.widgetPageDown);
        pageDownButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });
    }