Hello Friends,,,, till now we had acquire knowledge on whats the android? and its architecture all now i am going to detail about the Core Building Blocks of Android that means Fundamental Blocks of Android they are :
- Activity
- View
- Intent
- Services
- Content Providers
- Fragments
- AndroidManifest.xml
- AVD (Android Virtual Device)
Activity: An Activity is a Class that represents a single Screen
An Activity is implemented as a subclass of an Activity. Here is the Syntax :
Public class MainActivity extends Activity{
}
View : Anything that you see on screen is View that is UI Elements such as Buttons, Label , Text Fields etc..,
Intent : Intent is mainly used to invoke the Components. It is mainly used for
- Start the Service
- Launch an activity
- Display a web page
- Display a list of Contacts
- Broadcast a message
- Dial a phone call etc.., Here is the Syntax
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse("http://www.acquireandroid.blogspot.in"));
startActivity(i);
Here i is the object creation for intent, this is the code to view the webpage which is mentioned in Uri.parse....
Services : Service is a background process that can run for Long Time
There are two types of services Local Service and Remote Service
There are two types of services Local Service and Remote Service
- Local Service is accessed from within the application
- Remote Service is accessed remotely from other application running on the same device
Content Providers : Content Providers are used to share the data between application
A Content provider is implemented as a subclass of ContentProvider class and must implement a standard set of APIs that enable other applications to perform transactions... Here is the Syntax
Public class MyContentProvider extends ContentProvider
{
public void onCreate()
{
}
}
Fragments : It is like a Parts of activity. An Activity can display one or more fragments on the screen at the same time.
AndroidManifest.xml : It contains information about activities, content providers, permissions etc. It is like web.xml file in Java EE.
AVD (Android Virtual Device) : It is used to test the android application without the need for mobile or tablet etc. It can be created in different configuration to emulate different types of real devices.
In Future i will go through detailed about these Fundamental Blocks...that's all for today friends Happy learning... :-)
