Expert Android by Satya Komatineni, Dave MacLean (auth.)

By Satya Komatineni, Dave MacLean (auth.)

From the prime writer of Android books, Apress' Expert Android grants complicated suggestions for customizing perspectives, controls, and layouts. you are going to learn how to improve apps in checklist time utilizing JSON, complex shape Processing, and the BaaS (Backend As A carrier) platform Parse. The booklet additionally contains large assurance on OpenGL, seek, and Telephony. With those complex and time saving applied sciences possible liberate compelling cellular purposes in Google Play and the Amazon Appstore at a fast pace.

In specialist Android, you will examine to:

  • Borrow, reuse, or construct customized Android UI elements
  • Create 3D reviews utilizing OpenGL ES 2.0
  • Write collaborative purposes within the Parse cloud and converse together with your app consumer group via Parse Push know-how
  • Reduce the time-to-market whereas developing rock good apps for a number of units

no matter if you're someone or firm developer, in Expert Android you will find the complex concepts and practices to take your cellular apps to the following point. whatever the Android unlock, this booklet serves as your definitive, capstone reference on your Apress Android experience.

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Sample text

In this onDateSet callback method, we interrogate to see whether the button that invoked the fragment dialog is a “from” date button or a “to” date button. In Listing 2-10, also see how we then locate the text view belonging to the corresponding date control and set its text. CHAPTER 2: Exploring Compound Controls 47 This concludes the intricacies involved in using fragment-based dialogs in compound controls. To summarize, (a) you have to get a fragment manager, (b) you have to pass callback objects to the fragment dialogs, (c) you have to use argument bundles to save state, and (d) you have to use onActivityCreated to reestablish callback pointers.

The onclick in Listing 2-6 will be invoked when any of the GO buttons in Figure 1-1 are touched/pressed. Based on the button pressed, you invoke the date picker fragment 42 CHAPTER 2: Exploring Compound Controls dialog and also pass the button ID along. This button ID allows the date picker dialog to send the button ID back to DurationControl to know which date (“from” or “to”) to set. Listing 2-6. Invoking Fragment Dialogs public class DurationControl { ... datePicker"); return; }//eof-onclick ...

However, we haven’t shown how to extend simpler pre-existing views like a TextView. Knowing what you do now, this should be a walk in the park. The steps to extend an existing view like a TextView would be as follows: 1. Extend from TextView. TextView will take care of measuring, drawing, etc. 2. xml. 3. Implement any view state that you want to manage yourself in addition to TextView or just delegate that to the TextView. We will leave this effort for you as an exercise to test your mastery of the topic.

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