To align text in TextView at the center vertically and horizontally we need to make use of gravity attribute.
Example 1 :You can use center_vertical | center_horizontal value to set the text at the center of the TextView area.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
android:id="@+id/textView1"
android:layout_width="300dp"
android:layout_height="400dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:gravity="center_vertical|center_horizontal"
android:text="Example 1" />
</RelativeLayout>
Example 2: You can also use center value to get the same result
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
android:id="@+id/textView2"
android:layout_width="300dp"
android:layout_height="400dp"
android:gravity="center"
android:text="Example 2" />
</RelativeLayout>
Result :
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