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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context=".MainActivity"
    android:weightSum="1"
    android:background="#249CBC" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="LED Control"
        android:textStyle="bold"
        android:textColor="#FFFFFF"/>



    <Button
        android:id="@+id/doon"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="CONNECT"
        android:onClick="doGo"
        android:textColor="#249CBC"/>


    <WebView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/webView1"
        />
</LinearLayout>