First make your TextView clickable
by adding below in your layout.xml
<TextView
...
...
android:clickable="true">
</TextView>
And in your java code inside OnClickListener of that particular TextView Start phone activty as
TextView tv=(TextView) findViewById(R.id.tv_contact);
tv.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("tel://"+ tv.getText().toString().trim())));
}
});'
And if you want link on specific text on textview then this post may help you
Android textview with clickable phone number
Edit
As @Apoorv suggested,you may also use android:autoLink = "phone"
as
In the xml file, add the below lines.
<TextView
....
android:autoLink = "phone"
/>
For more info see android:autoLink - Have a Clickable Phone Number link in a TextView, in XML