Dynamically create button in android

MainActivity.java

public class MainActivity extends Activity { 

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

/** Call customButton Method */

customButton();

}

private void customButton() {

// TODO Auto-generated method stub

Button myButton = new Button(this);

myButton.setText("Click Me");

LinearLayout ll = (LinearLayout)findViewById(R.id.btn_layout);

LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);

ll.addView(myButton, lp);

myButton.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

Toast.makeText(MainActivity.this, "Hello Friends", Toast.LENGTH_LONG).show();

}

});

}

}

activity_main.xml

<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:background="@drawable/dynamic"
    android:orientation="vertical"
    tools:context=".MainActivity" >

 <LinearLayout
        android:id="@+id/btn_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </LinearLayout>

</LinearLayout>