Add View programmatically, using addView() and addContentView()

Add View Programmatically, using addView() and addContentView()

package com.example.androidview;

import android.os.Bundle;
import android.app.Activity;
import android.widget.Button;
import android.widget.LinearLayout;

public class MainActivity extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  LinearLayout mainLayout = 
    (LinearLayout)findViewById(R.id.mainlayout);
  
  //newButton added to the existing layout
  Button newButton = new Button(this);
  newButton.setText("Hello");
  mainLayout.addView(newButton);
  
  //anotherLayout and anotherButton added 
  //using addContentView()
  LinearLayout anotherLayout = new LinearLayout(this);
  LinearLayout.LayoutParams linearLayoutParams = 
    new LinearLayout.LayoutParams(
      LinearLayout.LayoutParams.WRAP_CONTENT,
      LinearLayout.LayoutParams.WRAP_CONTENT);
  
  Button anotherButton = new Button(this);
  anotherButton.setText("I'm another button");
  anotherLayout.addView(anotherButton);
  
  addContentView(anotherLayout, linearLayoutParams);
 }

}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context=".MainActivity"
    android:background="#000080"
    android:id="@+id/mainlayout">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#ffffff"
        android:textStyle="bold|italic"
        android:textSize="50sp"
        android:text="android-coding.blogspot.com" />

</LinearLayout>