안드로이드 동적 textview 생성

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private static final float FONT_SIZE = 10;
    private LinearLayout container;

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //부모 뷰
        container = (LinearLayout) findViewById(R.id.layout);

        textview("1");
        textview("2");
        textview("3");

    }
    public void textview(String a){
        //TextView 생성
        TextView view1 = new TextView(this);
        view1.setText(a);
        view1.setTextSize(FONT_SIZE);
        view1.setTextColor(Color.BLACK);

        //layout_width, layout_height, gravity 설정
        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        lp.gravity = Gravity.CENTER;
        view1.setLayoutParams(lp);

        //부모 뷰에 추가
        container.addView(view1);
    }
}