Code to remove Junk or Strange symbols(Garbage symbols) from String in Android.

String testStr="hii!@#$%^&*()_+=~`?|{}[]...,<>:;äöüÄÖÜßéèáàúùóòêìó213";
testStr=testStr. replaceAll("[^a-zA-Z0-9!@#$%^&*()-_=:.;{[}]|'?/<,>/\"\\+]", "");

 (OR)

Use [^\p{L}\p{Nd}] - this matches all (Unicode) characters that are neither letters nor (decimal) digits.
In Java:
String resultString = subjectString.replaceAll("[^\\p{L}\\p{Nd}]", "");
Edit:

I changed \p{N} to \p{Nd} because the former also matches some number symbols like ¼; the latter doesn't. See it on regex101.com.

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