Try setting this Akshar.ttf font to your TextView through setTypeface, it suuports both English and Tamil.
Here is the outcome:
Or, look for a similar font which supports both language.
your second solution is to use image for this small Tamil text portion using SpannableStringBuilder.
Code for setting custom font to TextView:
Assuming you have the Akshar.ttf font in fonts folder under assets folder:
Typeface tf = Typeface.createFromAsset(getAssets(), "fonts/Akshar.ttf");
TextView tv = (TextView) findViewById(R.id.CustomFontText);
tv.setTypeface(tf);
tv.setText("Seasonal messages like welcome (???????) is used in Kolam. Volunteering to draw kolam at temple is sometimes done when a devotee's");
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