防止空跳转报错

跳转activity时，为了防止跳转的activity被修改而为空报错，可以添加如下判断，做容错处理

                       Intent intent = new Intent();
                        intent.setAction(Constants.ACTION_ONE);
                        PackageManager pm = getContext().getPackageManager();
                        if (intent.resolveActivity(pm) != null) {
                            startActivity(intent);
                        }