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Xamarin.Android
Introduction to Xamarin.Android (60 mins)
• Layouts
• Android tools and SDK Update
• Build / How Xamarin Work
• Walkthrough - Android TipCalc (https://github.com/Damian-
Pumar/Curso-Xamarin-NEORIS)
Activities and Intents – Navigation (60 mins)
Lifecycle of an Activity Visual Representation (10 mins)
• Walkthrough - Saving the Activity State
Activity States
The Android OS arbitrates Activities based on their state. This helps
Android identify activities that are no longer in use, allowing the OS to
reclaim memory and resources.
https://developer.xamarin.com/videos/?v=Activities_and_Intents#n0xht5emac
Lifecycle of an
Activity
Xamarin Developer
https://developer.xamarin.com/guides/android
/application_fundamentals/activity_lifecycle/
Android Developer
https://developer.android.com/training/basics/
activity-lifecycle/index.html
Back vs. Home
There is a subtle difference between the two buttons, even though they appear to
have the same effect of putting an application in the background. When a user clicks
the Back button, they are telling Android that they are done with the activity. Android
will destroy the Activity. In contrast, when the user clicks the Home button the
activity is merely placed into the background – Android will not kill the activity.
https://developer.xamarin.com/videos/?v=Activities_and_Intents#n0xht5emac

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Dia 2 xamarin android

  • 1. Xamarin.Android Introduction to Xamarin.Android (60 mins) • Layouts • Android tools and SDK Update • Build / How Xamarin Work • Walkthrough - Android TipCalc (https://github.com/Damian- Pumar/Curso-Xamarin-NEORIS) Activities and Intents – Navigation (60 mins) Lifecycle of an Activity Visual Representation (10 mins) • Walkthrough - Saving the Activity State
  • 2. Activity States The Android OS arbitrates Activities based on their state. This helps Android identify activities that are no longer in use, allowing the OS to reclaim memory and resources. https://developer.xamarin.com/videos/?v=Activities_and_Intents#n0xht5emac
  • 3. Lifecycle of an Activity Xamarin Developer https://developer.xamarin.com/guides/android /application_fundamentals/activity_lifecycle/ Android Developer https://developer.android.com/training/basics/ activity-lifecycle/index.html
  • 4. Back vs. Home There is a subtle difference between the two buttons, even though they appear to have the same effect of putting an application in the background. When a user clicks the Back button, they are telling Android that they are done with the activity. Android will destroy the Activity. In contrast, when the user clicks the Home button the activity is merely placed into the background – Android will not kill the activity. https://developer.xamarin.com/videos/?v=Activities_and_Intents#n0xht5emac

Editor's Notes

  1. Video - Introduction to Xamarin.Android https://www.youtube.com/watch?v=LBJhCjhaw1g - Activities and Intents: https://www.youtube.com/watch?v=g2chToQF4Nk - Lifecycle of an Activity Visual Representation - https://www.youtube.com/watch?v=h69WDWZdqi4 - Walkthrough : https://developer.xamarin.com/guides/android/application_fundamentals/activity_lifecycle/saving_state_walkthrough/
  2. Active or Running - Activities are considered active or running if they are in the foreground, also known as the top of the activity stack. This is considered the highest priority activity in Android, and as such will only be killed by the OS in extreme situations, such as if the activity tries to use more memory than is available on the device as this could cause the UI to become unresponsive. Paused - When the device goes to sleep, or an activity is still visible but partially hidden by a new, non-full-sized or transparent activity, the activity is considered paused. Paused activities are still alive, that is, they maintain all state and member information, and remain attached to the window manager. This is considered to be the second highest priority activity in Android and, as such, will only be killed by the OS if killing this activity will satisfy the resource requirements needed to keep the Active/Running Activity stable and responsive. Stopped/Backgrounded - Activities that are completely obscured by another activity are considered stopped or in the background. Stopped activities still try to retain their state and member information for as long as possible, but stopped activities are considered to be the lowest priority of the three states and, as such, the OS will kill activities in this state first to satisfy the resource requirements of higher priority activities. Restarted – It is possible for an activity that is anywhere from paused to stopped in the lifecycle to be removed from memory by Android. If the user navigates back to the activity it must be restarted, restored to its previously saved state, and then displayed to the user.
  3. Video: https://www.youtube.com/watch?v=h69WDWZdqi4 Walkthrough : https://developer.xamarin.com/guides/android/application_fundamentals/activity_lifecycle/saving_state_walkthrough/
  4. There is a subtle difference between the two buttons, even though they appear to have the same effect of putting an application in the background. When a user clicks the Back button, they are telling Android that they are done with the activity. Android will destroy the Activity. In contrast, when the user clicks the Home button the activity is merely placed into the background – Android will not kill the activity.