Question

Most Android users learn how to use the smartphone and the apps and become better at it with time. There is a certain consistency from app to app on how buttons work, how selections are made, how the device is operated. The Widgets discussed in this chapter create this consistency. Why is it good to use existing Widgets to create your apps, and when would you consider building in Java new types of controls? Can you give two examples of apps, which require custom controls?

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Android is a mobile operating system developed by Google. It is based on a modified version of the Linux kernel and other open source software, and is designed primarily for touchscreen mobile devices such as smartphones and tablets. In addition, Google has further developed Android TV for televisions, Android Auto for cars, and Wear OS for wrist watches, each with a specialized user interface. Variants of Android are also used on game consoles, digital cameras, PCs and other electronics.

Android is developed by Google until the latest changes and updates are ready to be released, at which point the source code is made available to the Android Open Source Project (AOSP)an open source initiative led by Google^] The AOSP code can be found without modification on select devices, mainly the Nexus and Pixelseries of devices. The source code is, in turn, customized and adapted by original equipment manufacturers(OEMs) to run on their hardware.Also, Android's source code does not contain the often proprietary device drivers that are needed for certain hardware components. As a result, most Android devices, including Google's own, ultimately ship with a combination of free and open source and proprietary software, with the software required for accessing Google services falling into the latter category

A great way to improve your application is by providing an app widget to accompany it. App widgets are simple controls can be placed on places like the Home screen, informing the user of important updates within the application. App widgets remind the user you’re your app exists and help encourage them to use the application more often, among other benefits. In this tutorial, learn to create a simple app widget to enhance to the user’s experience in the Tutlist tutorial application.

App Widgets have been around since API Level 3 (Android 1.5). Over time, features have been added to the app widget framework, but for this tutorial we’ll stick to the basics. For the purposes of this tutorial, we want to design a simple app widget that reminds the user that new tutorials are available to read. Therefore, we will create a widget that displays some information about the latest tutorial. The user can click on the app widget on their Home screen and launch straight into the application.

Packages are used in Java in order to prevent naming conflicts, to controlaccess, ... A Package can be defined as a grouping of related types(classes, interfacesWhile creating a package, you should choose a name for the package

Following the steps in this procedure will change the default label and text box field of the Budget Amount field to the slider custom control on the Opportunity entity. You can use similar steps to replace an existing field with a custom control or configure a custom control for a custom field.

1. Sign in to PowerApps.

2. Expand Data, select Entities, select the entity that you want, and then select the Forms tab.

3. Open a form such as the Main form for the opportunity entity.

4. In the form editor, double-click the field where you want to add a custom control, such as the Budget Amount field on the opportunity main form. Alternatively, you can create a custom field.

5. On the Field Properties page, select the Controls tab, and then select Add Control.

6. On the Add Control page, select the control that you want, such as the Linear Slider control shown here, and then select Add.