How to change a TextView's style at runtime

I have an android app on which, when the user taps a TextView, I would like to apply a defined style.

I thought to find a textview.setStyle() but it doesn't exists. I tried

textview.setTextAppearance();

but it does not work.

I did this by creating a new XML file res/values/style.xml as follows:

<?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>

I also have an entries in my "strings.xml" file like this:

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

Then, in my code I created a ClickListener to trap the tap event on that TextView: EDIT: As from API 23 'setTextAppearance' is deprecated

    myTextView.setOnClickListener(new View.OnClickListener() {
    			public void onClick(View view){
    				//highlight the TextView
    				//myTextView.setTextAppearance(getApplicationContext(), R.style.boldText);
    if (Build.VERSION.SDK_INT < 23) {
       myTextView.setTextAppearance(getApplicationContext(), R.style.boldText);
    } else {
       myTextView.setTextAppearance(R.style.boldText);
    }
     myTextView.setBackgroundResource(R.color.highlightedTextViewColor);
    			}
    		});

To change it back, you would use this:

if (Build.VERSION.SDK_INT < 23) {
    myTextView.setTextAppearance(getApplicationContext(), R.style.normalText);
} else{
   myTextView.setTextAppearance(R.style.normalText);
}
myTextView.setBackgroundResource(R.color.normalTextViewColor);

Like Jonathan suggested, using textView.setTextTypeface works, I just used it in an app a few seconds ago.

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

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

You an set it from code. Typeface

Programmatically: Run time

You can do programmatically using setTypeface():

textView.setTypeface(null, Typeface.NORMAL);      // for Normal Text
textView.setTypeface(null, Typeface.BOLD);        // for Bold only
textView.setTypeface(null, Typeface.ITALIC);      // for Italic
textView.setTypeface(null, Typeface.BOLD_ITALIC); // for Bold and Italic

XML: Design Time

You can set in XML as well:

android:textStyle="normal"
android:textStyle="normal|bold"
android:textStyle="normal|italic"
android:textStyle="bold"
android:textStyle="bold|italic"

Hope this will help

Summved

i found textView.setTypeface(Typeface.DEFAULT_BOLD); to be the simplest method.

try this line of code.

textview.setTypeface(textview.getTypeface(), Typeface.DEFAULT_BOLD);

here , it will get current Typeface from this textview and replace it using new Typeface. New typeface here is DEFAULT_BOLD but you can apply many more.

See doco for setText() in TextView http://developer.android.com/reference/android/widget/TextView.html

> To style your strings, attach android.text.style.* objects to a SpannableString, or see the Available Resource Types documentation for an example of setting formatted text in the XML resource file.

Depending on which style you want to set, you have to use different methods. TextAppearance stuff has its own setter, TypeFace has its own setter, background has its own setter, etc.