我在我的应用中使用Google通知,直到现在我在清单中完成了以下操作:
<!-- GCM -->
<uses-permission android:name="android.permission.GET_ACCOUNTS" /> <!-- GCM requires a Google account. -->
<uses-permission android:name="android.permission.WAKE_LOCK" /> <!-- Keeps the processor from sleeping when a message is received. -->
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" /> <!-- This app has permission to register and receive data message. -->
<!-- Creates a custom permission so only this app can receive its messages. NOTE: APP_PACKAGE.permission.C2D_MESSAGE -->
<permission android:name="com.myapp.permission.C2D_MESSAGE" android:protectionLevel="signature" />
<uses-permission android:name="com.myapp.permission.C2D_MESSAGE" />
<!-- END GCM -->
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它完美运行,直到我将Nexus 7更新为Android 5.0.
现在,当我尝试使用Eclipse在此设备中安装应用程序时,出现此错误:
INSTALL_FAILED_DUPLICATE_PERMISSION perm = com.myapp.permission.C2D_MESSAGE pkg …
android android-notifications google-cloud-messaging android-5.0-lollipop
我正在尝试在Windows上设置Apache Spark.
经过一番搜索,我明白独立模式就是我想要的.我要下载哪些二进制文件才能在Windows中运行Apache spark?我在火花下载页面看到了带有hadoop和cdh的发行版.
我没有在网上引用这个.我们非常感谢您的分步指南.
我只注意到top
,window
和parent
变量给我相同的值.我在gmail收件箱页面测试了这个.有谁知道这三个值之间有什么区别?
我正在使用melt
并遇到以下警告消息:
attributes are not identical across measure variables; they will be dropped
环顾四周后人们提到它是因为变量是不同的类; 但是,我的数据集不是这种情况.
这是数据集:
test <- structure(list(park = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 1L,
1L, 1L, 1L), .Label = c("miss", "piro", "sacn", "slbe"), class = "factor"),
a1.one = structure(c(3L, 1L, 3L, 3L, 3L, 3L, 1L, 3L, 3L,
3L), .Label = c("agriculture", "beaver", "development", "flooding",
"forest_pathogen", "harvest_00_20", "harvest_30_60", "harvest_70_90",
"none"), class = "factor"), a2.one = structure(c(6L, 6L,
6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L), .Label = …
Run Code Online (Sandbox Code Playgroud) 我们希望处理403错误,404错误,由于a导致的所有错误,MySpecialDomainException
并为所有其他错误(包括IIS配置中的错误!)提供默认错误页面.所有错误都应该返回正确的Razor视图,ErrorController
在视图前面有一个非常好的.例如,像这样:
public class ErrorController : Controller
{
public ViewResult NotFound () { return View(); }
public ViewResult Forbidden () { return View(); }
public ViewResult Default ()
{
var ex = ObtainExceptionFromSomewhere();
if(ex is MySpecialDomainException)
return View("MySpecialDomainException", new ErrorModel { Exception = ex });
return View("GeneralError", new ErrorModel { Exception = ex });
}
}
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目前,您可以在www上找到许多不同的方法,有些可能已经过时了.在这些:
Q1:使用ASP.NET MVC 5满足我们要求的推荐方法是什么?
我们还希望捕获IIS主机中发生的错误.Q2:为了防止IIS必须处理任何404,我们考虑添加一个匹配所有可能URL的默认路由 - 这是值得推荐的吗?最好注册IIS的404'?
问题3:甚至可以注册一个可以返回控制器的IIS错误页面,还是仅支持ASPX /静态HTML的IIS?
我正在使用民意调查应用程序完成DjangoProject教程.正如教程在第4部分中所述,我试图导入'reverse': from django.urls import reverse
但是得到错误:
来自django.urls导入反向ImportError:没有名为urls的模块
我把它改成了ROOT_URLCONF
' urls
',然而,它也没有用.
感谢任何帮助,谢谢.
settings.py
import os
# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/1.9/howto/deployment/checklist/
# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = '3jyaq2i8aii-0m=fqm#7h&ri2+!7x3-x2t(yv1jutwa9kc)t!e'
# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True
ALLOWED_HOSTS = []
# Application definition
INSTALLED_APPS = [
'polls.apps.PollsConfig',
'django.contrib.admin',
'django.contrib.auth', …
Run Code Online (Sandbox Code Playgroud) 我想声明一个所有其他模式对象都可以继承的基类,例如:
class Base(db.Model):
created_on = db.Column(db.DateTime, default=db.func.now())
updated_on = db.Column(db.DateTime, default=db.func.now(), onupdate=db.func.now())
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然后所有其他模式对象都可以从它继承而不必重复两列的声明.
我如何在Flask-SQLAlchemy中执行此操作?
from flask.ext.sqlalchemy import SQLAlchemy
db = SQLAlchemy(app)
class User(db.Model):
__tablename__ = 'users'
id = db.Column(db.Integer, primary_key = True)
email = db.Column(db.String(255), unique = True)
Run Code Online (Sandbox Code Playgroud) 当您从word文档复制并粘贴到tinyMCE编辑器时,有时会出现不需要的<p>
标记:
<p> </p>
<div class="starpasspro-example-question">
<p><strong>Example: Levels of strategy</strong></p>
<p>Microsoft is one of the world’s largest organisations, providing corporate solutions to businesses throughout the world to help them realise their fullest potential. At Microsoft, there are three levels of strategy as follows:</p>
</div>
<p> </p>
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这里生成的代码我想以<p>
任何方式删除标签吗?
我已经查看过相关问题,但没有解决我的问题.
我试图使用dismissViewControllerAnimated:animated:completion
和presentViewControllerAnimated:animated:completion
连续.使用故事板,我通过部分卷曲动画模拟呈现InfoController.
部分卷曲显示我想要启动的InfoController上的按钮MFMailComposeViewController
.因为部分卷曲部分隐藏了MFMailComposeViewController
,我首先要通过取消动画部分卷曲来解除InfoController.然后我想要MFMailComposeViewController
动画片.
目前,当我尝试这个时,部分卷曲没有动画,但是MFMailComposeViewController
没有得到呈现.我也有一个警告:
警告:尝试在InfoController上显示MFMailComposeViewController:其视图不在窗口层次结构中!
InfoController.h:
#import <UIKit/UIKit.h>
#import <MessageUI/MessageUI.h>
#import <MessageUI/MFMailComposeViewController.h>
@interface InfoController : UIViewController <MFMailComposeViewControllerDelegate>
@property (weak, nonatomic) IBOutlet UIButton *emailMeButton;
-(IBAction)emailMe:(id)sender;
@end
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InfoController.m
#import "InfoController.h"
@interface InfoController ()
@end
@implementation InfoController
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (IBAction)emailMe:(id)sender {
[self dismissViewControllerAnimated:YES completion:^{
[self sendMeMail];
}];
}
- (void)sendMeMail {
MFMailComposeViewController *mailController = [[MFMailComposeViewController alloc] init];
if([MFMailComposeViewController canSendMail]){
if(mailController)
{
NSLog(@"%@", self); // This returns …
Run Code Online (Sandbox Code Playgroud) 好吧,假设我正在为我的 div 使用以下设置:
.background
将包含一个图像。
.overlay
会有一个半透明的白色背景作为覆盖层,
.inner
会有效地屏蔽掉 div 大小的矩形吗?使背景透明并穿过覆盖层 div。
<div class="background">
<div class="overlay">
<div class="inner">
</div>
</div>
</div>
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只用CSS可以实现吗?
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