Calculating proper leading

leading.java

TextView title_TextView = (TextView) findViewById(R.id.title);
Paint title_Paint = title_TextView.getPaint();
Paint.FontMetrics title_FontMetrics = title_Paint.getFontMetrics();

TextView subheading_TextView = (TextView) findViewById(R.id.subheading);
Paint subheading_Paint = subheading_TextView.getPaint();
Paint.FontMetrics subheading_FontMetrics = subheading_Paint.getFontMetrics();

Log.d("Survy", "title descent:      " + title_FontMetrics.descent);
Log.d("Survy", "title ascent:       " + title_FontMetrics.ascent);

Log.d("Survy", "subheading descent: " + subheading_FontMetrics.descent);
Log.d("Survy", "subheading ascent:  " + subheading_FontMetrics.ascent);

DisplayMetrics displayMetrics = getApplicationContext().getResources().getDisplayMetrics();
float dp = 40;
float px = dp * ((float) displayMetrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT);

float spacing = px - title_FontMetrics.bottom + subheading_FontMetrics.top;
Log.d("Survy", "spacing:            " + spacing);

View view = (View) findViewById(R.id.spacing);
view.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,  (int)(spacing)));

float spacing_dp = spacing / ((float) displayMetrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT);
Log.d("Survy", "spacing dp:         " + spacing_dp);