To make text in your TextView Bold or Italic in Android Programming we need to make use of attribute android:textAppearance. It can have three values normal, bold and Italic.

Android TextView Bold and Italic.png
Example 1 : Bold
<TextView
android:id="@+id/tvBold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This line is in Bold"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textStyle="bold" />
Example 2 : Italic
<TextView
android:id="@+id/tvItalic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This line is in Italic"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textStyle="italic" />
Example 3: Bold and Italic
<TextView
android:id="@+id/tvBoldnItalic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This line is in Bold and Italic"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textStyle="bold|italic" />
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:ignore="HardcodedText" >
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView1"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp"
android:text="This line is in Italic"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textStyle="italic" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="202dp"
android:text="This line is in Bold"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textStyle="bold" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView2"
android:layout_centerHorizontal="true"
android:layout_marginTop="40dp"
android:text="This line is both Bold and Italic"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textStyle="bold|italic" />
</RelativeLayout>

Android TextView Bold and Italic.png
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