线程是等待8秒后进入第二个activity里边,并且关闭对话框

new Thread()
 {public void run() 
{try {sleep(8000);        
Intent intent = new Intent();
intent.setClass(ac01.this, DispActivity.class);        
startActivity(intent);        } 
catch (Exception e) {
e.printStackTrace();
}
progressDialog.dismiss();
}        
}.start();