Update the listview single row and display in that listview again

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Android

i am inserting the value using edittext in sqlite and displaying it in listview...after that i clicked on a single row in listview and that single row values are displaying in previous edittext again..now i want to update this edittext value that is coming from listview. Please anyone tell me how to do this?

< Intent intent = getIntent();
name = intent.getStringExtra("Name");
desg = intent.getStringExtra("Designation");

nam= (EditText)findViewById(R.id.NameEditText);
des= (EditText)findViewById(R.id.desgEditText);

nam.setText(name);
des.setText(desg);


insertButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String employeename =nameEditText.getText().toString();
int employeeno =Integer.parseInt(noEditText.getText().toString());
String designation =desgEditText.getText().toString();

dbhelper.insertIntoEmployeeTable(employeename, designation, employeeno);
Log.v("Emp_Name", employeename);
Log.v("Emp_no", String.valueOf(employeeno));
Log.v("Emp_Desg", designation);
Toast.makeText(getBaseContext(), "Your data is inserted",Toast.LENGTH_SHORT).show();
}
});
updateButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String employeename =nam.getText().toString();
int employeeno =Integer.parseInt(noEditText.getText().toString());
String designation =des.getText().toString();

dbhelper.updateIntoEmployeeTable(employeename, designation, employeeno);
Log.v("updateEmp_Name", employeename);
Log.v("updateEmp_no", String.valueOf(employeeno));
Log.v("updateEmp_Desg", designation);
Toast.makeText(getBaseContext(), "Your data is updated",Toast.LENGTH_SHORT).show();


}
});
displayButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i=new Intent(MainActivity.this,GridViewActivity.class);
startActivity(i);//start gridview activity to show the records.
}
});
public void updateEmployeeTable(String employeename, String designation, int employeeno){
open();
ContentValues newValues = new ContentValues();
Log.v("UpdateEmployee", employeename + " " + " " + designation);

newValues.put("fld_employeename", employeename);
newValues.put("fld_designation", designation);
newValues.put("fld_employeeno", employeeno);

int update = db.update("tbl_employee", newValues,null, null);
db.close();
Log.v("Update_Query", String.valueOf(update));
}

ArrayList