textview.setTextAppearance();

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <style name="boldText">
        <item name="android:textStyle">bold|italic</item>
        <item name="android:textColor">#FFFFFF</item>
    </style>

    <style name="normalText">
        <item name="android:textStyle">normal</item>
        <item name="android:textColor">#C0C0C0</item>
    </style>

</resources>

<color name="highlightedTextViewColor">#000088</color>
<color name="normalTextViewColor">#000044</color>

myTextView.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view){
                //highlight the TextView
                myTextView.setTextAppearance(getApplicationContext(), R.style.boldText);
                myTextView.setBackgroundResource(R.color.highlightedTextViewColor);
            }
        });

myTextView.setTextAppearance(getApplicationContext(), R.style.normalText);
myTextView.setBackgroundResource(R.color.normalTextViewColor);

textView.setTypeface(null, Typeface.BOLD); // Typeface.NORMAL, Typeface.ITALIC etc.

TextView tvCompany = (TextView)findViewById(R.layout.tvCompany);
tvCompany.setTypeface(null,Typeface.BOLD);