Android Application Development for Java Programmers by James Sheusi

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By James Sheusi

We're witnessing an explosion within the use of hand held cellular units around the globe. contemporary polls have proven that many of us personal and use a couple of cellular machine, and a few use as many as 3 or 4. shrewdpermanent telephones, drugs, and hand held video game units are ubiquitous. The Android working procedure (OS)--an open-source OS with Linux at its core--is an ever-more-popular OS on those units. ANDROID program improvement FOR JAVA PROGRAMMERS offers an awesome, quick-start educational for an individual drawn to constructing Android cellular gadget functions, from the scholar or hobbyist accustomed to Java, to the skilled programmer desirous to input the cellular machine program marketplace. as the Android improvement software program presents an emulator application, the reader doesn't have to personal an Android cellular machine to use this booklet. even supposing the code provided within the ebook can be utilized to supply whole working purposes, the objective is to encourage the reader to carry his personal cellular program principles to truth very quickly. The e-book is geared up in a logical, evolutionary demeanour beginning with configuration of the advance surroundings and finishing with entire tasks. the start chapters hide simple program parts and configuration of the Android emulator and simple person interface layout, while later chapters disguise find out how to accomplish extra concerned parts similar to use of GPS, portraits, networking, and databases.

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Here, the IDE will generally highlight mistakes right on the editor screen and not let you run the application on the screen or in the editor. In fact, these are the most obvious and easiest errors to fix. 7 is a screenshot with an Eclipse error indicator to the left of the code lines. 7 Error markers in the Eclipse editor. The error, indicated by a red circle, indicates a missing semicolon at the end of the line, a punctuation error, so to speak. If you spot one of these and you don’t immediately know what the problem is, hold the mouse pointer over the red circle (or square, in the case of certain errors) a moment, and an explanation of the error appears.

2 Emulator shows two TextViews, arranged horizontally. Java programmers are familiar with the different layouts used in Frames, such as the BorderLayout and FlowLayout. The “layouts” for Android applications vary in a similar manner. Some of the other Layout classes that are also subclasses of the ViewGroup class are FrameLayout, AbsoluteLayout, TableLayout, and RelativeLayout. The AbsoluteLayout allows the programmer to specify the exact x,y coordinates of the components on the screen, but it is of limited use because it doesn’t adjust for variations in the screen resolution of multiple target devices.

Java file: /* AUTO-GENERATED FILE. DO NOT MODIFY. * * This class was automatically generated by the * aapt tool from the resource data it found. It * should not be modified by hand. DemoApp; public final class R { public static final class attr { } public static final class drawable { public static final int icon=0x7f020000; } public static final class id { public static final int base=0x7f060000; public static final int my_Button=0x7f060002; public static final int my_EditText=0x7f060003; public static final int my_TextView=0x7f060001; } public static final class layout { public static final int main=0x7f030000; } public static final class string { public static final int app_name=0x7f040001; public static final int hello=0x7f040000; } public static final class style { public static final int shout=0x7f050000; } } We have seen before that Eclipse builds a basic framework for the main Java file.

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