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#3: Collapsing Toolbar

Collapsing Toolbar         CollapsingToolbarLayout is a ViewGroup that provides many of the visual characteristics and interactions for collapsing toolbars specified in the material guidelines. To create the collapsing toolbar, CollapsingToolbarLayout integrates with AppBarLayout, CoordinatorLayout, Toolbar, and a scrollable content view, such as RecyclerView. How to work with Collapsing Toolbar:     To add a collapsing toolbar to your layout, place the CollapsingToolbarLayout inside an AppBarLayout. Then, add a Toolbar and any other views as a child to the CollapsingToolbarLayout. Make sure that the entire view structure is inside a CoordinatorLayout to take advantage of CollapsingToolbarLayout’s scrolling and features. Sample Code: <android.support.design.widget.CoordinatorLayout     android:layout_width="match_parent"     android:layout_height="match_parent">     <!-- Scrollable view ...
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Service in Android

Service in Android A Service is an application component that can perform long-running operations in the background, and it doesn't provide a user interface. Another application component can start a service, and it continues to run in the background even if the user switches to another application. Additionally, a component can bind to a service to interact with it and even perform inter process communication (IPC). For example, a service can handle network transactions, play music, perform file I/O, or interact with a content provider, all from the background. These are the three different types of services: Foreground   A foreground service performs some operation that is noticeable to the user. For example, an audio app would use a foreground service to play an audio track. Foreground services must display a Notification . Foreground services continue running even when the user isn't interacting with the app.   Background   A background service perf...
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