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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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#2: SQLite database

SQLite What is SQLite? SQLite is an Open Source Database which is embedded into Android. SQLite supports standard relational database features like SQL syntax, transactions and prepared statements. In addition it requires only little memory at runtime (approx. 250 KByte). SQLite supports the data types   TEXT   (similar to String in Java),   INTEGER   (similar to long in Java) and REAL   (similar to double in Java). All other types must be converted into one of these fields before saving them in the database. SQLite itself does not validate if the types written to the columns are actually of the defined type, e.g. you can write an integer into a string column and vice versa. SQLite in Android? SQLite is available on every Android device. Using an SQLite database in Android does not require any database setup or administration. You only have to define the SQL statements for creating and updating the database. Afterwards the database is ...
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