import android.graphics.Color;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.widget.TextViewCompat;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.GridLayout.LayoutParams;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.companyname.projectname.R;

import static com.companyname.projectname.R.id.FL_relativeLayout;


public class FragmentFL extends android.support.v4.app.Fragment {

    public FragmentFL() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        return inflater.inflate(R.layout.fragment_fl, container, false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        View v = getView();
        assert v != null;

        RelativeLayout relativelayout = v.findViewById(FL_relativeLayout);

        RelativeLayout.LayoutParams rlp = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

        TextView txt1 = new TextView(getActivity());
        txt1.setText("Hello world");
        TextViewCompat.setTextAppearance(txt1, android.R.style.TextAppearance_Large);
        txt1.setTextColor(Color.BLACK);


        TextView txt2 = new TextView(getActivity());
        txt2.setText("Bonjour le monde");
        TextViewCompat.setTextAppearance(txt2, android.R.style.TextAppearance_Medium);
        txt1.setTextColor(Color.BLACK);


        rlp.setMargins(0, 0, 0, 20);
        rlp.addRule(RelativeLayout.BELOW, txt1.getId());
        txt1.setLayoutParams(rlp);
        txt2.setLayoutParams(rlp);

        relativelayout.addView(txt1);
        relativelayout.addView(txt2);

        // set IDs for text views
        txt1.setId(View.generateViewId());
        txt2.setId(View.generateViewId());

        super.onActivityCreated(savedInstanceState);
    }
}