How to add TextView in a Layout? (Android)

To add a textview to a layout, select the layout you need to add & then click the Add Button

Now your XML code looks like

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView android:text="@+id/TextView01"
android:id="@+id/TextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>
</LinearLayout>

here are some useful properties
To change your textview id

android:id="@+id/TextView"

To change your textview text

android:text="This is my first textview sample application"

To enable or disable textview

android:enabled="false"

To change your textview width & height

android:layout_height="wrap_content"android:layout_width="fill_parent"

To change your textview background

android:background="@drawable/icon"

To change your textview text size

android:textSize="16px"

To change your textview text style

android:textStyle="bold"

Working Example 

Android

Android is a Linux based operating system designed primarily for touchscreen mobile devices such as smartphones and tablet computers. Initially developed by Android, Inc. which Google backed financially and later bought in 2005.