Download Android Recipes: A Problem-Solution Approach by Dave Smith, Erik Hellman PDF

By Dave Smith, Erik Hellman

Discover greater than a hundred down-to-earth code recipes, overlaying quite a lot of worthy issues utilizing entire and real-world operating code examples. This publication is up to date to incorporate the Android N SDK (7.0), in addition to past releases.

Crammed with insightful guide and necessary examples, this 5th version of Android Recipes is your advisor to writing apps for one among today’s most popular cellular systems. It deals pragmatic suggestion that can assist you get the task performed quick and good. this may prevent loads of paintings over making a venture from scratch.

Instead of summary descriptions of complicated innovations, in Android Recipes you will find dwell code examples. should you commence a brand new undertaking you could give some thought to copying and pasting the code and configuration documents from this publication after which enhancing them on your personal customization wishes.

What you will Learn

  • Code for Android smartphones and tablets
  • Use exterior libraries to avoid wasting time and effort
  • Boost app functionality by utilizing the Android NDK and RenderScript
  • Design apps for functionality, responsiveness, and seamlessness
  • Send facts among units and different exterior hardware
  • Persist program information and proportion it among applications
  • Capture and play again a number of equipment media items
  • Communicate with net services
  • Get the main from your consumer interface

Who This booklet Is For

All Android app developers.

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Extra resources for Android Recipes: A Problem-Solution Approach

Example text

Com/apk/res/android"> @layout/main_tablet Listing 1-30. com/apk/res/android"> @layout/main_tablet Listing 1-31. com/apk/res/android"> @layout/main_tablet We have defined configuration groups to accommodate three classes of devices: handsets, 7-inch tablet devices, and 10-inch tablet devices. Handset devices will load the default layout when in portrait mode, and the landscape layout when the device is rotated.

Hiding Navigation Controls (API Level 14) SYSTEM_UI_FLAG_HIDE_NAVIGATION removes the onscreen HOME and BACK controls for devices that do not have physical buttons. While Android gives developers the ability to do this, it is with caution because these functions are extremely important to the user. If the navigation controls are manually hidden, any tap on the screen will bring them back. Listing 1-10 shows an example of this in practice. Listing 1-10. main); } public void onToggleClick(View v) { //Here we only need to hide the controls on a tap because // Android will make the controls reappear automatically // anytime the screen is tapped after they are hidden.

In this instance, however, we are inflating the top-level view of our activity, so we pass null here. Completely Custom Views Sometimes, the widgets available in the SDK just aren’t enough to provide the output you need. Or perhaps you want to reduce the number of views you have in your hierarchy by combining multiple display elements into a single view to improve performance. For these cases, you may want to create your own View subclass. In doing so, there are two main interaction points between your class and the framework that need to be observed: measurement and drawing.

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