Intents :   Intents are used to navigate  between two activities within the application means same app or outside the application means from the other activity within same the device outside the app. It is more important to know more about Intents in Android. Intent Starting an activity : An Activity represents a single screen in an...Read More

Layout : A layout defines the Design or structure for a user interface in your app, such as in an activity. All elements in the layout are built using a hierarchy of View and ViewGroup objects. user can see views  and interact with it. but ViewGroup is  invisible  and  that defines the layout structure for View and other ViewGroup objects The View objects are usually...Read More

  Manifest File : Every app project must have an AndroidManifest.xml file (the name has it’s importance) at the root of the  project source set. The manifest file describes the important essential information about your app to the Android build tools, the Android operating system, and Google Play. The manifest file is required to declare the following :...Read More

Resource: You should always externally use app resources such as images, color and strings ctc. from your code, so that you can maintain them separately and independent. You should also provide alternative resources for specific device configurations, by grouping them in specially-named resource directories. At runtime, Android uses the preferred resource based on the app...Read More