Eclipse Mobile Mousw Manual de usuario descargar pdf (Pagina 7)

public class myreceiver extends IntentReceiver

{

public void onReceiveIntent(Context arg0, Intent arg1)

{

// do something when this method is invoked.

}

Data management with ContentProvider

The ContentProvider is the Android mechanism for data-store abstraction. Let's

look at a specific type of data found on a mobile device: the address book or

contacts database. The address book contains all the contacts and phone numbers

a person might require when using a mobile phone. The ContentProvider is a

mechanism to abstract access to a particular data store. In many ways, the

ContentProvider acts in the role of a database server. Operations to read and

write content to a particular data store should be passed through an appropriate

ContentProvider, rather than accessing a file or database directly. There may be

both "clients" and "implementations" of the ContentProvider.

The next section introduces Android views, the UI mechanism for putting things on

the screen of an Android device.

Views

The Android activity employs views to display UI elements. Views follow one of the

following layout designs:

LinearVertical

Each subsequent element follows its predecessor by flowing beneath it in a

single column.

LinearHorizontal

Each subsequent element follows its predecessor by flowing to the right in a

single row.

Relative

Each subsequent element is described in terms of offsets from the prior

element.

Table

A series of rows and columns similar to HTML tables. Each cell can hold one

view element.

Once a particular layout (or combination of layouts) has been selected, individual

views are used to present the UI.

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Eclipse Mobile Mousw Manual de usuario Pagina 7