[Solved] running application it’s showing this error in android

by


Use URLEncoder to encode your URL params such as student_name[k] and roll_no[k]:

final String queryString =
    "student_name=" + URLEncoder.encode(student_name[k], "UTF-8")
    + "&roll_no="+ URLEncoder.encode(roll_no[k], "UTF-8");

Use equals() and not == or != for comparing Strings:

if(!"".equals(queryString))

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solved running application it’s showing this error in android