Android Activity Group有问题吗？

intent i=new intent();
i.setclass(presentclassname.this,secondclass.class);
startActivity(i); will take u to other screen...

back.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            tv.setText(\"\");
            finish();
        }