我有一个字符串,我需要验证它是否是有效的十六进制颜色代码.我的示例字符串如下:

1 - #ff00000

2 - #ff347820

如何验证上述字符串以检查它们是否是有效的十六进制颜色代码.
任何人都可以帮我解决这个问题吗？

提前致谢

请向我解释android中可用的所有选项的含义:displayOptions如:

-useLogo
-showHome
-homeAsUp
-showTitle
-showCustom -disableHome

我已经阅读了Doc for Constant displayOptions但我仍然无法理解

我想部署一个简单的Spring MVC APP来打开我为google搜索并发现spring-mvc-3-on-jboss但是项目结构不同我有基本的Spring MVC项目结构是


就是在这个repo,在openshift.com我创建了应用程序并配置为:

但是当我转到我的app-url时,我看不到我的home.jsp文件作为欢迎文件我只看到默认/传统的欢迎页面.
有任何建议如何配置项目正常工作？

我想创建一个具有展开和折叠功能的布局.扩展应该是这样的,一次只能扩展一行,如果用户点击其他第一行应该自己关闭.在每一行我必须显示不同的版图设计 .

请帮助我,我已搜索但我没有得到我怎么能创建这个功能.请把它作为参考它将是什么样的.请建议我最好的方法来获得这个

我正在制作通知应用程序并努力解决以下错误：

java.lang.IllegalArgumentException: com.tonyapp.rabbitfarm: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
    Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.
        at android.app.PendingIntent.checkFlags(PendingIntent.java:375)
        at android.app.PendingIntent.getBroadcastAsUser(PendingIntent.java:645)
        at android.app.PendingIntent.getBroadcast(PendingIntent.java:632)
        at com.allyants.notifyme.NotifyMe.scheduleNotification(NotifyMe.java:159)
        at com.allyants.notifyme.NotifyMe.<init>(NotifyMe.java:89)
        at com.allyants.notifyme.NotifyMe$Builder.build(NotifyMe.java:327)
        at com.tonyapp.rabbitfarm.NotesTakerActivity.onTimeSet(NotesTakerActivity.java:291)
        at com.wdullaer.materialdatetimepicker.time.TimePickerDialog.notifyOnDateListener(TimePickerDialog.java:1893)
        at com.wdullaer.materialdatetimepicker.time.TimePickerDialog.lambda$onCreateView$3$com-wdullaer-materialdatetimepicker-time-TimePickerDialog(TimePickerDialog.java:761)
        at com.wdullaer.materialdatetimepicker.time.TimePickerDialog$$ExternalSyntheticLambda3.onClick(Unknown Source:2)
        at android.view.View.performClick(View.java:7441)
        at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1202)
        at android.view.View.performClickInternal(View.java:7418)
        at android.view.View.access$3700(View.java:835)
        at …

我想制作一个简单的计算器我的代码如下:

package som.dev.android.calc;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class CalcApp extends Activity {
    /** Called when the activity is first created. */
    Button addValues, subValues, equalsValue;
    EditText inputValue;

    int inputNum = 0;
    public int value1;
    public int value2;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // initializing Views
        inputValue = (EditText) findViewById(R.id.editText1);
        addValues = (Button) findViewById(R.id.addBtn);
        subValues = (Button) findViewById(R.id.subBtn);
        equalsValue = (Button) findViewById(R.id.equalsBtn);

        // adding onClick Listeners
        addValues.setOnClickListener(new View.OnClickListener() {
            public void …

当我从openshift发布我的网址时,它向我显示以下错误

服务暂时不可用

由于维护停机或容量问题,服务器暂时无法为您的请求提供服务.请稍后再试.

位于app-domain.rhcloud.com的Apache/2.2.15(Red Hat)服务器端口80"

请给我一些建议我如何解决这个问题？

我按照Openshift网站上的说明安装了rhc.当我跑步时,一切似乎都很好gem install rhc,hgem update rhc但是当我试着打电话时,rhc我得到以下信息.我已经尝试重新安装ruby和git,包括32和64条消息.我还认为问题是缺少openssl,但安装没有任何区别.

我已经没有想法了,任何帮助都会非常感激

c:/local/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `requir
e': cannot load such file -- dl/import (LoadError)
        from c:/local/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:
54:in `require'
        from c:/local/Ruby22/lib/ruby/gems/2.2.0/gems/net-ssh-2.9.2/lib/net/ssh/
authentication/pageant.rb:1:in `<top (required)>'
        from c:/local/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:
54:in `require'
        from c:/local/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:
54:in `require'
        from c:/local/Ruby22/lib/ruby/gems/2.2.0/gems/net-ssh-2.9.2/lib/net/ssh/
authentication/agent/socket.rb:5:in `<top (required)>'
        from c:/local/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:
54:in `require'
        from c:/local/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:
54:in `require'
        from c:/local/Ruby22/lib/ruby/gems/2.2.0/gems/net-ssh-2.9.2/lib/net/ssh/
authentication/agent.rb:22:in `<top (required)>'
        from c:/local/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:
54:in `require'
        from c:/local/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:
54:in `require'
        from c:/local/Ruby22/lib/ruby/gems/2.2.0/gems/net-ssh-2.9.2/lib/net/ssh/
authentication/key_manager.rb:4:in `<top (required)>'
        from c:/local/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:
54:in `require'
        from c:/local/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:
54:in `require'
        from c:/local/Ruby22/lib/ruby/gems/2.2.0/gems/net-ssh-2.9.2/lib/net/ssh/ …

我来回上网，找不到解决我问题的方法。我正在尝试使用与jdbc的参数绑定来查询mysql表，但是它在我的语句中始终报告问号的语法错误。

这是我的课：

    package todoList_;

    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    import java.sql.SQLException;
    import java.sql.Statement;
    import java.util.HashMap;

    public class testBinding {

        // JDBC driver name and database URL
        static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
        static final String DB_URL = "jdbc:mysql://localhost/TODO?useJvmCharsetConverters=true";

        // Database credentials
        static final String USER = "root";
        static final String PASS = "root";

        public static void main(String args[]) {
            // TODO Auto-generated method stub
            Connection conn = null;
            Statement stmt = null;
            HashMap<Integer, String> list = new …

我有实时数据库的Firebase应用程序,我有db.json

{
  "brs" : {
    "route": [
      {
        "routeDestination": "DDDD1",
        "routeOrigin": "OOOO1",
        "bus" : {
            "busArrivalTime" : "created_at_timestamp",
            "busDepartureTime" : "created_at_timestamp",
            "busName" : "SOME NAME",
            "busSeatCost" : "0000",
            "busTotalSeats" : "000",
            "reservations": [
              {
                "reservationId": 1,
                "reservationDate": "Wed Jul 06 23:54:56 EDT 2016",
                "seats": [
                  {                
                    "seatNumber": 1
                  },
                  {               
                    "seatNumber": 2
                  }
                ]
              }
            ] 
        }            
      },
      {
        "routeDestination": "DDDD2",
        "routeOrigin": "OOOO2",
        "bus" : {
            "busArrivalTime" : "created_at_timestamp",
            "busDepartureTime" : "created_at_timestamp",
            "busName" : "SOME NAME",
            "busSeatCost" : "0000",
            "busTotalSeats" …