Android Application Development for Java Programmers by James Sheusi

By James Sheusi

We're witnessing an explosion within the use of hand-held cellular units around the world. fresh polls have proven that many folks personal and use a couple of cellular gadget, and a few use as many as 3 or 4. shrewdpermanent telephones, pills, and hand held video game units are ubiquitous. The Android working method (OS)--an open-source OS with Linux at its core--is an ever-more-popular OS on those units. ANDROID software improvement FOR JAVA PROGRAMMERS offers a great, quick-start instructional for somebody attracted to constructing Android cellular gadget purposes, from the scholar or hobbyist accustomed to Java, to the skilled programmer desirous to input the cellular machine software industry. as the Android improvement software program presents an emulator software, the reader doesn't have to personal an Android cellular machine to use this booklet. even supposing the code provided within the publication can be utilized to provide whole operating purposes, the objective is to encourage the reader to convey his personal cellular program principles to fact very quickly. The e-book is prepared in a logical, evolutionary demeanour beginning with configuration of the improvement surroundings and finishing with accomplished initiatives. the start chapters disguise uncomplicated software elements and configuration of the Android emulator and simple consumer interface layout, while later chapters conceal tips to accomplish extra concerned parts akin to use of GPS, photographs, networking, and databases.

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If not, what follows is a quick lesson. Colors are made of three component values: one for red, one for green, and one for blue. Each component can have a value ranging from 0 to 255. The values are specified in hexadecimal, or base-16. 2. xml File The hexadecimal equivalent for 255 is FF (15*16 + 15). Next to the pound sign (#) are three pairs of hex values, one for each color. So in our sample values, #FF0000 gives the maximum value for red (FF or 255), and zero for both green and blue. This yields the brightest, purest red.

This means that each is set to occupy the full width of the screen, hence fill the parent. 1 Emulator display of two TextView objects. because it is set to fill the screen completely from left to right. So before we run the application, let’s change the horizontal property for both TextViews to wrapcontent. com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent" > Now rerun the application.

9. 9 Eclipse Debug perspective. Debugging with Eclipse In the lower-right corner is a panel with a tab marked LogCat. This is the first place to check for the source of the error. Any text in red is what you should examine. 10. 10 Eclipse LogCat panel. ArrayIndexOutOfBoundsException. Here is our problem. Now we know what to look for in our code to correct the problem. Let’s go back and fix the problem with a try-catch block. In the catch portion, we will print some diagnostics. Notice that we cannot use the typical printStackTrace( ) on a mobile application to help us.

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Android Application Development for Java Programmers by James Sheusi
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