);      // Create btn_contact_us0     Button btn_contact_us0 = new Button(this);     // Generate an Id and assign it to programmatically created Button     btn_contact_us0.setId(View.generateViewId());     btn_contact_us0.setText("Contact Us 0");     btn_contact_us0.setLayoutParams(new ConstraintLayout.LayoutParams(         ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));     // Add programmatically created Button to ConstraintLayout     constraintLayout.addView(btn_contact_us0);      // Create btn_contact_us0     Button btn_contact_us0 = new Button(this);     // Generate an Id and assign it to programmatically created Button     btn_contact_us0.setId(View.generateViewId());     btn_contact_us0.setText("Contact Us 0");     btn_contact_us0.setLayoutParams(new ConstraintLayout.LayoutParams(         ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));     // Add programmatically created Button to ConstraintLayout     constraintLayout.addView(btn_contact_us0);      // Create 