Finally I have found a solution.I converted Unicode fonts to Ascii,by replacing each and every Unicode charecters with Ascii.Here I use MLTT-Karthika as Ascii font.Then set this font in typeface.
t=(TextView) findViewById(R.id.text);
Typeface typeFace = Typeface.createFromAsset(getAssets(),"karthika.TTF");
t.setTypeface(typeFace);
String CurrentDecription;
String s2=s.toLowerCase().replaceAll("അ", "A").replaceAll("ആ","B")
.replaceAll("ഇ","C")
.replaceAll("ഈ","Cu")
.replaceAll("ഉ","D")
.replaceAll("ഊ","Du")
.replaceAll("ഋ","E")
.replaceAll("എ","F")
.replaceAll("ഏ","G")
.replaceAll("ഐ","sF")
.replaceAll("ഒ","H")
.replaceAll("ഓ","Hm")
.replaceAll("ഔ","Hu")
.replaceAll("ക്തേ","tà").replaceAll("ക്തെ","sà").replaceAll("ക്ത്യ","ày").replaceAll("ക്തൈ","ssà").replaceAll("ക്ത","à").replaceAll("ക്ഷ്യ","£y").replaceAll("ക്ഷെ","s£").replaceAll("ക്ഷേ","t£").replaceAll("ക്ഷൈ","ss£").replaceAll("ക്ഷ","£").replaceAll("ക്ടെ","sÎ").replaceAll("ക്ടേ","tÎ").replaceAll("ക്ട","Î").replaceAll("ങ്കെ","s¦").replaceAll("ങ്കേ","t¦").replaceAll("ങ്കൈ","ss¦").replaceAll("ങ്ക","¦").replaceAll("ക്ലെ","s¢").replaceAll("ക്ലേ","t¢").replaceAll("ക്ലൈ","ss¢").replaceAll("ക്ല","¢").replaceAll("ക്കേ","t¡").replaceAll("ക്കോ","t¡m").replaceAll("ക്കെ","s¡").replaceAll("കൊ","sIm").replaceAll("കെ","sI").replaceAll("കോ","tIm").replaceAll("കേ","tI").replaceAll("ക്വ","Iz").replaceAll("ക്രൈ","ss{I").replaceAll("ക്രോ","t{Im").replaceAll("ക്രേ","t{I").replaceAll("ക്രൊ","s{Im").replaceAll("ക്രെ","s{I").replaceAll("ക്ര","{I").replaceAll("ക്യ","Iy").replaceAll("ക്കൈ","ss¡").replaceAll("ക്ക","¡").replaceAll("കൈ","ssI").replaceAll("ക","I")
.replaceAll("ഖേ","tJ").replaceAll("ഖൈ","ssJ").replaceAll("ഖെ","sJ").replaceAll("ഖ്വ","Jz").replaceAll("ഖ്യ","Jy").replaceAll("ഖ","J")
.replaceAll("ഗ്ലെ","s¥").replaceAll("ഗ്ലേ","t¥").replaceAll("ഗ്ലൈ","ss¥").replaceAll("ഗ്ല","¥").replaceAll("ഗ്ഗേ","t¤").replaceAll("ഗ്ഗൈ","ss¤").replaceAll("ഗ്ഗെ","s¤").replaceAll("ഗൈ","ssK").replaceAll("ഗൊ","sKm").replaceAll("ഗെ","sK").replaceAll("ഗ്വ","Kz").replaceAll("ഗ്യ","Ky").replaceAll("ഗൃ","Kr").replaceAll("ഗ്രൈ","ss{K").replaceAll("ഗ്ര","{K").replaceAll("ഗ്ഗ","¤").replaceAll("ഗോ","tKm").replaceAll("ഗേ","tK").replaceAll("ഗ","K")
.replaceAll("ഘൈ","ssL").replaceAll("ഘൊ","sLm").replaceAll("ഘെ","sL").replaceAll("ഘോ","tLm").replaceAll("ഘേ","tL").replaceAll("ഘ","L")
.replaceAll("ങ്ങൈ","ss§").replaceAll("ങ്ങെ","s§").replaceAll("ങ്ങേ","t§").replaceAll("ങ്ങ്യ","§y").replaceAll("ങ്ങ","§").replaceAll("ങേ","tM").replaceAll("ങൈ","ssM").replaceAll("ങെ","sM").replaceAll("ങ","M")
.replaceAll("ഞ്ചൈ","ss©").replaceAll("ഞ്ചെ","s©").replaceAll("ഞ്ചേ","t©").replaceAll("ഞ്ച്യ","©y").replaceAll("ഞ്ച","©").replaceAll("ച്ചേ","t¨").replaceAll("ച്ചൈ","ss¨").replaceAll("ച്ചെ","s¨").replaceAll("ചോ","tNm").replaceAll("ചേ","tN").replaceAll("ചൈ","ssN").replaceAll("ചൊ","sNm").replaceAll("ചെ","sN").replaceAll("ച്ര","{N").replaceAll("ച്യ","Ny").replaceAll("ച്ച","¨").replaceAll("ച","N")
.replaceAll("ഛൈ","ssO").replaceAll("ഛെ","sO").replaceAll("ഛേ","tO").replaceAll("ഛ","O")
.replaceAll("ജ്ഞൈ","ssÚ").replaceAll("ജ്ഞെ","sÚ").replaceAll("ജ്ഞേ","tÚ").replaceAll("ജ്ഞ","Ú").replaceAll("ജ്ജേ","tÖ").replaceAll("ജ്ജൈ","ssÖ").replaceAll("ജ്ജെ","sÖ").replaceAll("ജ്ജ","Ö").replaceAll("ജൈ","ssP").replaceAll("ജൊ","sPm").replaceAll("ജെ","sP").replaceAll("ജ്വ","Pz").replaceAll("ജ്യ","Py").replaceAll("ജ്ര","{P").replaceAll("ജോ","tPm").replaceAll("ജേ","tP").replaceAll("ജ","P")
.replaceAll("ഝൈ","ssQ").replaceAll("ഝെ","sQ").replaceAll("ഝേ","tQ").replaceAll("ത്സ്യ","Qy").replaceAll("ഝ","Q")
.replaceAll("ഞ്ഞൈ","ssª").replaceAll("ഞ്ഞെ","sª").replaceAll("ഞ്ഞേ","tª").replaceAll("ഞ്ഞ","ª")
.replaceAll("ഞൈ","ssR").replaceAll("ഞെ","sR").replaceAll("ഞേ","tR").replaceAll("ഞ","R")
.replaceAll("ന്റെ","sâ").replaceAll("ന്റേ","tâ").replaceAll("ന്റ","â").replaceAll("ണ്ടൈ","ssî").replaceAll("ണ്ടെ","sî").replaceAll("ണ്ടേ","tî").replaceAll("ണ്ട്യ","îy").replaceAll("ണ്ട","î").replaceAll("ട്ട്യ","«y").replaceAll("ട്ടൈ","ss«").replaceAll("ട്ടെ","s«").replaceAll("ട്രൈ","ss{S").replaceAll("ട്രോ","t{Sm").replaceAll("ട്രേ","t{S").replaceAll("ട്രെ","s{S").replaceAll("ടൈ","ssS").replaceAll("ടൊ","sSm").replaceAll("ടെ","sS").replaceAll("ട്ര","{S").replaceAll("ട്വ","Sz").replaceAll("ട്യ","Sy").replaceAll("ട്ടോ","t«m").replaceAll("ട്ടേ","t«").replaceAll("ട്ട","«").replaceAll("ടോ","tSm").replaceAll("ടേ","tS").replaceAll("ട","S")
.replaceAll("ഠൈ","ssT").replaceAll("ഠെ","sT").replaceAll("ഠേ","tT").replaceAll("ഠ്യ","Ty").replaceAll("ഠ","T")
.replaceAll("ഡ്രൈ","ss{U").replaceAll("ഡ്രേ","t{U").replaceAll("ഡ്രെ","s{U").replaceAll("ഡൈ","ssU").replaceAll("ഡെ","sU").replaceAll("ഡ്ര","{U").replaceAll("ഡേ","tU").replaceAll("ഡോ","tUm").replaceAll("ഡ","U")
.replaceAll("ഢൈ","ssV").replaceAll("ഢെ","sV").replaceAll("ഢേ","tV").replaceAll("ഢ","V")
.replaceAll("ണ്മൈ","ss×").replaceAll("ണ്മെ","s×").replaceAll("ണ്മേ","t×").replaceAll("ണ്മ","×").replaceAll("ണ്ണൈ","ss®").replaceAll("ണ്ണെ","s®").replaceAll("ണൈ","ssW").replaceAll("ണെ","sW").replaceAll("ണ്‍","¬").replaceAll("ണ്ണേ","t®").replaceAll("ണ്ണ","®").replaceAll("ണേ","tW").replaceAll("ണ","W")
.replaceAll("ത്ഥൈ","ss°").replaceAll("ത്ഥെ","s°").replaceAll("ത്ഥേ","t°").replaceAll("ത്ഥ്യ","°y").replaceAll("ത്ഥ","°").replaceAll("ത്മൈ","ssß").replaceAll("ത്മെ","sß").replaceAll("ത്മേ","tß").replaceAll("ത്മ","ß").replaceAll("ത്തൈ","ss¯").replaceAll("ത്തെ","s¯").replaceAll("ന്തൈ","ss´").replaceAll("ന്തെ","s´").replaceAll("തൈ","ssX").replaceAll("തൊ","sXm").replaceAll("തെ","sX").replaceAll("ത്വ","Xz").replaceAll("ന്ത്ര","{´").replaceAll("ന്ത്യ","´y").replaceAll("ന്തേ","t´").replaceAll("ന്തോ","t´m").replaceAll("ന്ത","´").replaceAll("ത്യേ","tXy").replaceAll("ത്യ","Xy").replaceAll("തൃ","Xr").replaceAll("ത്രൈ","ss{X").replaceAll("ത്രോ","t{Xm").replaceAll("ത്രൊ","t{Xm").replaceAll("ത്രേ","t{X").replaceAll("ത്രെ","s{X").replaceAll("ത്ര","{X").replaceAll("ത്തേ","t¯").replaceAll("ത്ത","¯").replaceAll("തോ","tXm").replaceAll("തേ","tX").replaceAll("ത","X")
.replaceAll("ഥൈ","ssY").replaceAll("ഥെ","sY").replaceAll("ഥേ","tY").replaceAll("ഥ","Y")
.replaceAll("ദ്ധേ","t²").replaceAll("ദ്ധൈ","ss²").replaceAll("ദ്ധെ","s²").replaceAll("ദ്ധ","²").replaceAll("ബ്ദൈ","ssÐ").replaceAll("ബ്ദെ","sÐ").replaceAll("ബ്ദേ","tÐ").replaceAll("ബ്ദ","Ð").replaceAll("ന്ദൈ","ssµ").replaceAll("ന്ദെ","sµ").replaceAll("ന്ദേ","tµ").replaceAll("ന്ദ്രേ","t{µ").replaceAll("ന്ദ്രൈ","ss{µ").replaceAll("ന്ദ്രെ","s{µ").replaceAll("ന്ദ്ര","{µ").replaceAll("ന്ദ","µ").replaceAll("ദ്ദൈ","ss±").replaceAll("ദ്ദെ","s±").replaceAll("ദ്ദേ","t±").replaceAll("ദ്ദ","±").replaceAll("ദൈ","ssZ").replaceAll("ദെ","sZ").replaceAll("ദ്വൈ","ssZz").replaceAll("ദ്വേ","tZz").replaceAll("ദ്വ","Zz").replaceAll("ദ്യെ","sZy").replaceAll("ദ്യേ","tZy").replaceAll("ദ്യ","Zy").replaceAll("ദൃ","Zr").replaceAll("ദേ","tZ").replaceAll("ദ","Z")
.replaceAll("ബ്ധെ","sÏ").replaceAll("ബ്ധേ","tÏ").replaceAll("ബ്ധ","Ï").replaceAll("ന്ധ്രെ","s{Ô").replaceAll("ന്ധ്യ","Ôy").replaceAll("ന്ധ്ര","{Ô").replaceAll("ന്ധെ","sÔ").replaceAll("ന്ധേ","tÔ").replaceAll("ന്ധ","Ô").replaceAll("ധൈ","ss[").replaceAll("ധെ","s[").replaceAll("ധ്യ","[y").replaceAll("ധൃ","[r").replaceAll("ധേ","t[").replaceAll("ധ","[")
.replaceAll("ന്‍െറ","sâ").replaceAll("ന്‍േറ","tâ").replaceAll("ന്റെ","sâ").replaceAll("ന്റേ","tâ").replaceAll("ന്‍റ","â").replaceAll("ന്റ","â").replaceAll("ന്‍","³").replaceAll("ന്","³").replaceAll("ന്നൈ","ss¶").replaceAll("ന്നെ","s¶").replaceAll("ന്നേ","t¶").replaceAll("ന്ന","¶").replaceAll("ന്മൈ","ss∙").replaceAll("ന്മെ","s∙").replaceAll("ന്മേ","t∙").replaceAll("ന്മ","∙").replace("നൈ","ss\\").replace("നൊ","s\\m").replace("നെ","s\\").replace("ന്വേ","t\\z").replace("ന്വെ","s\\z").replace("ന്വ","\\z").replace("ന്യ","\\y").replace("നോ","t\\m").replace("നേ","t\\").replace("ന","\\")
.replaceAll("മ്പൈ","ss¼").replaceAll("മ്പെ","s¼").replaceAll("മ്പ്യ","¼y").replaceAll("മ്പേ","t¼").replaceAll("മ്പ","¼").replaceAll("ല്പെ","så").replaceAll("ല്പേ","tå").replaceAll("ല്പ","å").replaceAll("പ്ലേ","ts¹").replaceAll("പ്ലൈ","ss¹").replaceAll("പ്ലെ","s¹").replaceAll("പ്ല","¹").replaceAll("പ്പേ","t¸").replaceAll("പ്പൈ","ss¸").replaceAll("പ്പെ","s¸").replaceAll("പൈ","ss]").replaceAll("പൊ","s]m").replaceAll("പെ","s]").replaceAll("പ്യ","]y").replaceAll("പ്രേ","t{]").replaceAll("പ്രൈ","ss{]").replaceAll("പ്രെ","s{]").replaceAll("പ്ര","{]").replaceAll("പ്പേ","t¸").replaceAll("പ്പ","¸").replaceAll("പോ","t]m").replaceAll("പേ","t]").replaceAll("പ","]")
.replaceAll("ഫ്ലൈ","^vssf").replaceAll("ഫ്ലെ","^vsf").replaceAll("ഫ്ലേ","^vtf").replaceAll("ഫ്ല","^vf").replaceAll("ഫൈ","ss^").replaceAll("ഫൊ","s^m").replaceAll("ഫെ","s^").replaceAll("ഫോ","t^m").replaceAll("ഫേ","t^").replaceAll("ഫ്ര","{^").replaceAll("ഫ","^")
.replaceAll("ബ്ലൈ","ss»").replaceAll("ബ്ലെ","s»").replaceAll("ബ്ലേ","t»").replaceAll("ബ്ല","»").replaceAll("ബ്ബൈ","ssº").replaceAll("ബ്ബെ","sº").replaceAll("ബൈ","ss_").replaceAll("ബൊ","s_m").replaceAll("ബെ","s_").replaceAll("ബ്രേ","t{_").replaceAll("ബ്രൈ","ss{_").replaceAll("ബ്രെ","s{_").replaceAll("ബ്ര","{_").replaceAll("ബ്ബേ","tº").replaceAll("ബ്ബ","º").replaceAll("ബോ","t_m").replaceAll("ബേ","t_").replaceAll("ബ","_")
.replaceAll("ഭൈ","ss`").replaceAll("ഭെ","s`").replaceAll("ഭ്വ","`z").replaceAll("ഭ്ര","{`").replaceAll("ഭ്യ","`y").replaceAll("ഭൃ","`r").replaceAll("ഭേ","t`").replaceAll("ഭ","`")
.replaceAll("മ്മൈ","ss½").replaceAll("മ്മെ","s½").replaceAll("മൈ","ssa").replaceAll("മൊ","sam").replaceAll("മെ","sa").replaceAll("മ്യ","ay").replaceAll("മൃ","ar").replaceAll("മ്മേ","t½").replaceAll("മ്മ","½").replaceAll("മോ","tam").replaceAll("മേ","ta").replaceAll("മ","a")
.replaceAll("ല്യ","ey").replaceAll("ര്യ","cy").replaceAll("ഷ്യ","jy").replaceAll("ഹ്യ","ly").replaceAll("സ്യേ","tky").replaceAll("സ്യ","ky").replaceAll("ശ്യ","iy").replaceAll("വ്യ","hy").replaceAll("യ്യൈ","ss¿").replaceAll("യ്യെ","s¿").replaceAll("യോ","tbm").replaceAll("യൈ","ssb").replaceAll("യെ","sb").replaceAll("യ്യേ","t¿").replaceAll("യ്യ","¿").replaceAll("യേ","tb").replaceAll("യ","b")
.replaceAll("ഹ്ര","{l").replaceAll("സ്രേ","t{k").replaceAll("സ്ര","{k").replaceAll("വ്ര","{h").replaceAll("ശ്രേ","t{i").replaceAll("ശ്ര","{i").replaceAll("രൈ","ssc").replaceAll("രൊ","scm").replaceAll("രെ","sc").replaceAll("ര്വ","cz").replaceAll("ര്‍","À").replaceAll("ര്","À").replaceAll("ര്യ","cy").replaceAll("രോ","tcm").replaceAll("രേ","tc").replaceAll("ര","c")
.replaceAll("റ്റൈ","ssä").replaceAll("റ്റെ","sä").replaceAll("റ്റേ","tä").replaceAll("റ്റോ","täm").replaceAll("റ്റ","ä").replaceAll("റൈ","ssd").replaceAll("റെ","sd").replaceAll("റേ","td").replaceAll("റ","d")
.replaceAll("ഹ്ലെ","sË").replaceAll("ഹ്ലേ","tË").replaceAll("ഹ്ല","Ë").replaceAll("ശ്ലെ","sÇ").replaceAll("ശ്ലേ","tÇ").replaceAll("ശ്ല","Ç").replaceAll("ല്ലൈ","ssÃ").replaceAll("ല്ലൊ","sÃm").replaceAll("ല്ലെ","sÃ").replaceAll("ലൈ","sse").replaceAll("ലൊ","sem").replaceAll("ലെ","se").replaceAll("ല്ല്വ","Ãz").replaceAll("ല്ല","Ã").replaceAll("ല്‍","Â").replaceAll("ല്","Â").replaceAll("ല്ല്യ","Ãy").replaceAll("ല്ലോ","tÃm").replaceAll("ല്ലേ","tÃ").replaceAll("ല്ല","Ã").replaceAll("ലോ","tem").replaceAll("ലേ","te").replaceAll("ല","e")
.replaceAll("ള്ള","Å").replaceAll("ള്‍","Ä").replaceAll("ള്","Ä").replaceAll("ള്ളൈ","ssÅ").replaceAll("ള്ളെ","sÅ").replaceAll("ളൈ","ssf").replaceAll("ളെ","sf").replaceAll("ള്ള","Å").replaceAll("ള്ളേ","tÅ").replaceAll("ളേ","tf").replaceAll("ള","f")
.replaceAll("ഴൈ","ssg").replaceAll("ഴെ","sg").replaceAll("ഴേ","tg").replaceAll("ഴ","g")
.replaceAll("ഷ്വൈ","ssjz").replaceAll("ഷ്വെ","sjz").replaceAll("ഷ്വ","jz").replaceAll("ഹ്വ","lz").replaceAll("സ്വേ","tkz").replaceAll("സ്വൈ","sskz").replaceAll("സ്വെ","skz").replaceAll("സ്വ","kz").replaceAll("വ്വൈ","ssÆ").replaceAll("വ്വെ","sÆ").replaceAll("വൈ","ssh").replaceAll("വെ","sh").replaceAll("ശ്വേ","tiz").replaceAll("ശ്വ","iz").replaceAll("വ്വേ","tÆ").replaceAll("വ്വ","Æ").replaceAll("വേ","th").replaceAll("വോ","thm").replaceAll("വ","h")
.replaceAll("ശ്ശൈ","ssÈ").replaceAll("ശ്ശെ","sÈ").replaceAll("ശൈ","ssi").replaceAll("ശൊ","sim").replaceAll("ശെ","si").replaceAll("ശ്രേ","t{i").replaceAll("ശ്ര","{i").replaceAll("ശ്ശേ","tÈ").replaceAll("ശ്ശ","È").replaceAll("ശോ","tim").replaceAll("ശേ","ti").replaceAll("ശ","i")
.replaceAll("ഷൈ","ssj").replaceAll("ഷെ","sj").replaceAll("ഷേ","tj").replaceAll("ഷ","j")
.replaceAll("സ്സൈ","ssÊ").replaceAll("സ്സെ","sÊ").replaceAll("സൈ","ssk").replaceAll("സെ","sk").replaceAll("സ്സ","Ê").replaceAll("സ്സേ","tÊ").replaceAll("സേ","tk").replaceAll("സോ","tkm").replaceAll("സ","k")
.replaceAll("ഹൈ","ssl").replaceAll("ഹെ","sl").replaceAll("ഹേ","tl").replaceAll("ഹ","l")
.replaceAll("ാ","m")
.replaceAll("ി","n")
.replaceAll("ീ","o")
.replaceAll("ു","p")
.replaceAll("ൂ","q")
.replaceAll("ഃ","x")
.replaceAll("്","v")
.replaceAll("ം","w")
.replaceAll("ൗ","u")
.replaceAll("ൃ","r")
;
t.setText(s2);
