You can retrieve the user’s application usage patterns, such as information about frequently used applications.

The main features of the Tizen.Context.AppHistory namespace are:

• Retrieving application usage statistics

  You can retrieve application launch history, such as frequently used applications and recently used applications, using the Tizen.Context.AppHistory.UsageStatistics class.

• Retrieving battery usage statistics

  You can retrieve battery usage statistics, using the Tizen.Context.AppHistory.BatteryStatistics class.

Prerequisites

To enable your application to use the application usage history data functionality:

1. To use the Tizen.Context.AppHistory namespace, the application has to request permission by adding the following privilege to the tizen-manifest.xml file:

   <privileges>
      <privilege>http://tizen.org/privilege/apphistory.read</privilege>
   </privileges>
   

2. To use the methods and properties of the Tizen.Context.AppHistory namespace, include it in your application:

   using Tizen.Context.AppHistory;
   

Retrieving Application Usage Statistics

To retrieve application usage statistics for a given time period, and check detailed statistics information, such as duration, launch count, and last launch time of the used applications:

1. To retrieve the application launch history, create a usage statistics instance:
   • To use the default LaunchCountMost sort order, create a new instance of the Tizen.Context.AppHistory.UsageStatistics class without specifying the sortOrder parameter:

     UsageStatistics frequentlyUsedApp = new UsageStatistics();
     

   • To use another sort order for your usage statistics instance, add the sortOrder parameter to the Tizen.Context.AppHistory.UsageStatistics class constructor, using values of the Tizen.Context.AppHistory.UsageStatistics.SortOrderType enumeration:

     UsageStatistics recentlyUsedApp = new UsageStatistics(UsageStatistics.SortOrderType.LastLaunchTimeNewest);
     

2. To get information about the most frequently used applications for a given time period, use the Query() method of the Tizen.Context.AppHistory.UsageStatistics class:
   • To retrieve a list of frequently used applications for a given time period, specify the startTime and the endTime parameters to determine the time period.

     For example, to retrieve a list of the most frequently used applications for the last 2 weeks:

     IReadOnlyList<UsageStatisticsData> frequentlyUsedAppList = frequentlyUsedApp.Query(DateTime.Now.AddDays(-14), DateTime.Now);
     

   • By default, the query returns a maximum of 10 results. You can change the number of returned results by setting the resultSize parameter.

     For example, to retrieve a list of 5 most frequently used applications for the last 2 weeks:

     IReadOnlyList<UsageStatisticsData> frequentlyUsedAppList = frequentlyUsedApp.Query(DateTime.Now.AddDays(-14), DateTime.Now, 5);
     

   • The query returns a sorted list of Tizen.Context.AppHistory.UsageStatisticsData class instances. To enumerate the list:

     foreach(var record in frequentlyUsedAppList)
     {
         Log.Info(LOGTAG, "AppId: " + record.AppId);
         Log.Info(LOGTAG, "Duration: " + record.Duration);
         Log.Info(LOGTAG, "LaunchCount: " + record.LaunchCount);
         Log.Info(LOGTAG, "LastLaunchTime: " + record.LastLaunchTime);
     }
     

Retrieving Battery Usage Statistics

To retrieve battery usage statistics for a given time period, and check detailed statistics information, such as the battery consumption of the used applications:

1. To retrieve the battery consumption per application, create an instance of the Tizen.Context.AppHistory.BatteryStatistics class:

   BatteryStatistics batteryConsumedApp = new BatteryStatistics(BatteryStatistics.SortOrderType.ConsumptionMost);
   

2. To get the information about the application battery consumption, use the Query() method of the Tizen.Context.AppHistory.BatteryStatistics class.

   For example, to retrieve battery consumption history since the device was last fully charged, use a DateTime instance returned by the GetLastFullyChargedTime() method as the startTime parameter of the Query() method:

   DateTime time = BatteryStatistics.GetLastFullyChargedTime();
   IReadOnlyList<BatteryStatisticsData> batteryConsumedAppList = batteryConsumedApp.Query(time, DateTime.Now, 5);
   

3. The Query() method returns a sorted list of Tizen.Context.AppHistory.BatteryStatisticsData class instances. To enumerate the list:

   foreach(var record in batteryConsumedAppList)
   {
       Log.Info(LOGTAG, "AppId: " + record.AppId);
       Log.Info(LOGTAG, "Consumption: " + record.Consumption);
   }