android 系统弹框不消失

   AlertDialog.Builder builder = new AlertDialog.Builder(_context);        builder.setTitle("温馨提示").setMessage("您的账户被锁定，请联系闭门！")                .setPositiveButton("确定",                        new DialogInterface.OnClickListener() {                            public void onClick(DialogInterface dialog,                                                int which) {                                // 不消失                                try {//                                    java.lang.reflect.Field field = dialog//                                            .getClass().getSuperclass()//                                            .getDeclaredField("mShowing");//                                    field.setAccessible(true);//                                    field.set(dialog, false);                                    dialog.dismiss();

                                    /*****************************************/                                    MobclickAgent.onKillProcess(MyApplication.mApp.context);                                    Intent intent = new Intent(Intent.ACTION_MAIN);                                    intent.addCategory(Intent.CATEGORY_HOME);                                    _context.startActivity(intent);                                    finishProcess();                                    /*****************************************/

                                } catch (Exception e) {                                    e.printStackTrace();                                }                            }                        }).setCancelable(false).show();