System.exit(0);一直提示错误!!!
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
//return super.onKeyDown(keyCode, event);
if(keyCode==KeyEvent.KEYCODE_BACK){
webView.goBack();//返回上一界面
return true;
}
else{
System.exit(0);//退出程序
}
}