Question

how can i read characters from a string variable until a special character has reached, for example a ‘/’.it should be read from begining.
and how to send this string to another activity from onItemClickListener() method

Answer 1

How about split?

String theSeparator = "/";
String original = "Some string with a special char / and some content after the /";
String myString = original.split(Pattern.Quote(theSeparator))[0];

Now, passing the string when you start a new activity is pretty simple:

Intent i = new Intent(ThisActivity.this, NextActivity.class);
i.putExtra("My Super Special String", myString);
startActivity(i);

In the next activity, you call:

String myStringFromPreviousActivity = getIntent().getStringExtra("My Super Special String");