visual basic print barcode label AppWidgets in Java

Generator QR-Code in Java AppWidgets

AppWidgets
Create Quick Response Code In Java
Using Barcode printer for Android Control to generate, create QR Code image in Android applications.
www.OnBarcode.com
UPC-A Creation In Java
Using Barcode creation for Android Control to generate, create GS1 - 12 image in Android applications.
www.OnBarcode.com
excellent demonstration of simplicity and value. This widget is used to enable and disable various system services such as Bluetooth, Wi-Fi, GPS, and other batteryimpacting functions. GPS services are a significant drain on the battery the fact that the Power Control Widget exposes this on/off feature so easily makes the use of location-based services a more realistic option for Android users. On other phone platforms, this kind of functionality is generally hidden under system or option menus. You add AppWidgets to the home screen by pressing and holding an empty area until a menu launches, as shown in figure 17.2. From this menu, select Widgets and available AppWidgets are displayed in a scrollable list, as shown in figure 17.3. Tap on the desired widget to add an instance to your home screen. Figure 17.2 Add to home screen An AppWidget runs under another application, namely an AppWidgetHost, which is typically the device s home screen. The AppWidget code is implemented in an instance of an AppWidgetProvider, which is an extension of the BroadcastReceiver class. Recall from prior chapters that a BroadcastReceiver is defined as a receiver in the AndroidManifest.xml file. The AppWidgetProvider is a BroadcastReceiver with a special IntentFilter and a metadata tag that further defines the AppWidgetProvider s characteristics. An AppWidget may be implemented in code as a BroadcastReceiver alone, yet the AppWidgetProvider provides some convenience wrapper functionality and is the recommended means of coding an AppWidget. AppWidgets are designed to be updated periodically. The stock implementation of an AppWidget automatically updates at an interval defined by the developer at design time. In general, this update is kept to a low frequency to conserve battery power. There are other Figure 17.3 Choose a widget, mechanisms for updating an AppWidget on an as- any widget. needed basis through the use of Intents. The AppWidgetProvider extends BroadcastReceiver and therefore can receive different Intent Actions based on the defined IntentFilters. The common practice is to define an application-specific IntentFilter action and use the sendBroadcast method to trigger an AppWidget update on an as-needed basis.
Print PDF-417 2d Barcode In Java
Using Barcode generation for Android Control to generate, create PDF-417 2d barcode image in Android applications.
www.OnBarcode.com
Generating Barcode In Java
Using Barcode drawer for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
Introducing the AppWidget
Generate Data Matrix In Java
Using Barcode generator for Android Control to generate, create ECC200 image in Android applications.
www.OnBarcode.com
Encode Barcode In Java
Using Barcode generator for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
The details of the AppWidgetProvider, the special metadata in the AndroidManifest, IntentFilters, RemoteViews, and much more are all discussed in this chapter. Before we delve into the details of constructing an AppWidget, let s consider the various design patterns an AppWidget can satisfy.
Barcode Encoder In Java
Using Barcode generator for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
OneCode Creation In Java
Using Barcode generation for Android Control to generate, create USPS Intelligent Mail image in Android applications.
www.OnBarcode.com
17.1.2 AppWidget deployment strategies
QR Printer In Java
Using Barcode generator for Android Control to generate, create Denso QR Bar Code image in Android applications.
www.OnBarcode.com
QR Code 2d Barcode Creator In None
Using Barcode creation for Online Control to generate, create QR Code JIS X 0510 image in Online applications.
www.OnBarcode.com
In its most basic implementation, an AppWidget can be considered a dashboard of sorts. The Power Control Widget shown in figure 17.1 is a good example of this flavor of AppWidget. This AppWidget has no other user interface to which it s tied and any actions taken directly invoke an underlying request to enable or disable a system feature. In any normal scenario, there d be at most one Power Control Widget deployed to the home screen. A user is free to add multiple copies of the Power Control Widget to their home screen, but there s no additional utility or benefit from doing so. Now consider an AppWidget for Facebook or Twitter, as shown in figure 17.4. Some people have multiple social media accounts and may desire multiple AppWidgets instantiated for making updates to specific accounts. In this scenario, each AppWidget instance is tied to its own set of data. For the purposes of this chapter, we ll call this data the AppWidget instance model. Each instance of the AppWidget has its own set of data which in the case of a Twitter account widget would look like username/password information plus any cached data related to the specific account. We go into significant detail later in this chapter on how to manage this per-widget data. One role an AppWidget can play is as a smart shortcut. Rather than simply displaying a static shortcut to an application, the AppWidget provides a means of displaying pertinent and timely information to the user. When clicked, the AppWidget loads the relevant Activity or launches a relevant web page. Consider, for example, a calendar widget that displays upcoming events on the home screen. Tapping on the widget causes the calendar application to load, jumping to the specific event of interest. Due to the variable nature of an AppWidget s deployment strategy, it s important to give some consideration to how an AppWidget interacts with the other Android-based application components. What may seem like a simple AppWidget application may in fact require the collaboration of multiple components. Table 17.1 presents a nonexhaustive list of options for how an AppWidget may interact with other components within a suite of applications. What makes AppWidgets specifically (and Android generally) so appealing to a developer is the ability to Figure 17.4 Tweeting about distribute code that provides a small, focused piece of this chapter!
Code 3 Of 9 Decoder In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
UPC-A Supplement 5 Printer In None
Using Barcode generation for Word Control to generate, create UCC - 12 image in Word applications.
www.OnBarcode.com
Encode Barcode In None
Using Barcode encoder for Excel Control to generate, create Barcode image in Office Excel applications.
www.OnBarcode.com
Barcode Recognizer In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Create Barcode In Objective-C
Using Barcode creator for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
Encoding Quick Response Code In None
Using Barcode creation for Microsoft Word Control to generate, create Denso QR Bar Code image in Office Word applications.
www.OnBarcode.com
Painting Code 39 Extended In Objective-C
Using Barcode drawer for iPad Control to generate, create Code 39 Full ASCII image in iPad applications.
www.OnBarcode.com
QR Code Maker In None
Using Barcode drawer for Font Control to generate, create QR Code ISO/IEC18004 image in Font applications.
www.OnBarcode.com
Making Barcode In None
Using Barcode generator for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Decoding Code 128 Code Set A In C#
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.