Create LinearLayout Programmatically

/*from  www . j  av  a 2  s .  co m*/
package com.java2s.myapplication3.app;

import android.app.Activity;
import android.os.Bundle;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        LayoutParams params =
                new LinearLayout.LayoutParams(
                        LayoutParams.FILL_PARENT,
                        LayoutParams.WRAP_CONTENT);

        //---create a layout---
        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(LinearLayout.VERTICAL);

        //---create a textview---
        TextView tv = new TextView(this);
        tv.setText("This is a TextView");
        tv.setLayoutParams(params);

        //---create a button---
        Button btn = new Button(this);
        btn.setText("This is a Button");
        btn.setLayoutParams(params);

        //---adds the textview---
        layout.addView(tv);

        //---adds the button---
        layout.addView(btn);

        //---create a layout param for the layout---
        LinearLayout.LayoutParams layoutParam =
                new LinearLayout.LayoutParams(
                        LayoutParams.FILL_PARENT,
                        LayoutParams.WRAP_CONTENT );

        this.addContentView(layout, layoutParam);
    }
}