试着这样做:

创建共享数据类:

SharedData.java

import android.app.Application;

/**
 * Created by kundan on 6/23/2015.
 */
public class Globals {


    private static Globals instance = new Globals();

    // Getter-Setters
    public static Globals getInstance() {
        return instance;
    }

    public static void setInstance(Globals instance) {
        Globals.instance = instance;
    }

    private String notification_index;


    private Globals() {

    }


    public String getValue() {
        return notification_index;
    }


    public void setValue(String notification_index) {
        this.notification_index = notification_index;
    }



}

在那些你想要设置/获取数据的类中声明/初始化一个类的全局实例(在onCreate()方法之前使用此代码)

Globals sharedData = Globals.getInstance();

组数据:

sharedData.setValue("kundan");

得到的数据:

String n = sharedData.getValue();

你可以像这样使用单例模式:

package com.ramps;

public class MyProperties {
private static MyProperties mInstance= null;

public int someValueIWantToKeep;

protected MyProperties(){}

public static synchronized MyProperties getInstance() {
        if(null == mInstance){
            mInstance = new MyProperties();
        }
        return mInstance;
    }
}

在你的应用程序中，你可以这样访问你的单例:

MyProperties.getInstance().someValueIWantToKeep

import android.app.Application;

public class Globals extends Application
{
    private static Globals instance = null;
    private static int RecentCompaignID;
    private static int EmailClick;
    private static String LoginPassword;
    static String loginMemberID;
    private static String CompaignName = "";
    private static int listget=0;
    //MailingDetails
    private static String FromEmailadd="";
    private static String FromName="";
    private static String ReplyEmailAdd="";
    private static String CompaignSubject="";
    private static int TempId=0;
    private static int ListIds=0;

    private static String HTMLContent="";
    @Override
    public void onCreate() 
    {
        super.onCreate();
        instance = this;
    }

    public static Globals getInstance()
    {
        return instance;
    }

    public void setRecentCompaignID(int objRecentCompaignID)
    {
        RecentCompaignID = objRecentCompaignID;
    }

    public int getRecentCompaignID() 
    {
        return RecentCompaignID;
    }

    public void setLoginMemberID(String objloginMemberID) 
    {
        loginMemberID = objloginMemberID;
    }

    public String getLoginMemberID() 
    {
        return loginMemberID;
    }

    public void setLoginMemberPassword(String objLoginPassword)
    {
        LoginPassword = objLoginPassword;
    }

    public String getLoginMemberPassword()
    {
        return LoginPassword;
    }

    public void setEmailclick(int id)
    {
        EmailClick = id;
    }

    public int getEmailClick() 
    {
        return EmailClick;
    }
    public void setCompaignName(String objCompaignName)
    {
        CompaignName=objCompaignName;
    }
    public String getCompaignName()
    {
        return CompaignName;
    }
    public void setlistgetvalue(int objlistget)
    {
        listget=objlistget;
    }
    public int getlistvalue()
    {
        return listget;
    }
    public void setCompaignSubject(String objCompaignSubject)
    {
         CompaignSubject=objCompaignSubject;
    }
    public String getCompaignSubject()
    {
        return CompaignSubject;
    }
    public void setHTMLContent(String objHTMLContent)
    {
        HTMLContent=objHTMLContent;
    }
    public String getHTMLContent()
    {
        return HTMLContent;
    }
    public void setListIds(int objListIds)
    {
        ListIds=objListIds;
    }
    public int getListIds()
    {
        return ListIds;
    }
    public void setReplyEmailAdd(String objReplyEmailAdd)
    {
        ReplyEmailAdd=objReplyEmailAdd;
    }
    public String getReplyEmailAdd()
    {
        return ReplyEmailAdd;
    }
    public void setFromName(String objFromName)
    {
        FromName=objFromName;
    }
    public String getFromName()
    {
        return FromName;
    }
    public void setFromEmailadd(String objFromEmailadd)
    {
        FromEmailadd=objFromEmailadd;
    }
    public String getFromEmailadd()
    {
        return FromEmailadd;
    }
}

使用SharedPreferences存储和检索全局变量。

SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
String userid = preferences.getString("userid", null);

你可以扩展基本的android.app.Application类，并像这样添加成员变量:

public class MyApplication extends Application {

    private String someVariable;

    public String getSomeVariable() {
        return someVariable;
    }

    public void setSomeVariable(String someVariable) {
        this.someVariable = someVariable;
    }
}

在你的android manifest中，你必须声明实现android.app. application的类(添加android:name="。属性到现有的应用程序标签):

<application 
  android:name=".MyApplication" 
  android:icon="@drawable/icon" 
  android:label="@string/app_name">

然后在你的活动中，你可以像这样获取和设置变量:

// set
((MyApplication) this.getApplication()).setSomeVariable("foo");

// get
String s = ((MyApplication) this.getApplication()).getSomeVariable();

您可以使用应用程序首选项。只要您传递Context对象，就可以从任何活动或代码段访问它们，并且它们对于使用它们的应用程序是私有的，因此您不需要担心暴露应用程序特定的值，除非您处理路由设备。即使如此，您也可以使用哈希或加密方案来保存值。此外，这些首选项将从一个应用程序运行到下一个应用程序运行。 下面是您可以参考的一些代码示例。