Download E-books Android Cookbook PDF

By Ian F. Darwin

Jump in and construct operating Android apps with assistance from greater than 2 hundred demonstrated recipes. With this cookbook, you’ll locate suggestions for operating with the person interfaces, multitouch gestures, position understanding, net prone, and gadget beneficial properties corresponding to the telephone, digital camera, and accelerometer. you furthermore may get worthy steps on packaging your app for the Android Market.

Ideal for builders accustomed to Java, Android fundamentals, and the Java SE API, this ebook positive aspects recipes contributed through greater than 3 dozen builders from the Android group. every one recipe offers a transparent resolution and pattern code you should use on your undertaking without delay. between various themes, this cookbook is helping you:

  • Use instructions for designing a winning Android app
  • Work with UI controls, powerful layouts, and graphical elements
  • Learn the right way to benefit from Android’s wealthy beneficial properties on your app
  • Save and retrieve program facts in documents, SD playing cards, and embedded databases
  • Access RESTful internet companies, RSS/Atom feeds, and data from websites
  • Create location-aware companies to discover destinations and landmarks, and situate them on Google Maps and OpenStreetMap
  • Test and troubleshoot person elements and all of your application

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I statements on your code may well negatively impression app functionality. in reality, accordingly, you shouldn’t have Log. * statements compiled into the published app. ACRA/BugSense works good whilst the machine is hooked up to the net. this would possibly not continually be actual, and a few type of purposes won't require the web in any respect apart from ACRA. additionally, the ACRA stack hint offers purely the main points (in the stack hint) on the fast the Exception was once thrown, whereas this recipe offers a longer-term view whereas the app is operating. The RuntimeLog classification is proven in instance 3-5. instance 3-5. The RuntimeLog type // Use those integrated mechanisms import java. util. logging. FileHandler; import java. util. logging. Formatter; import java. util. logging. point; import java. util. logging. LogRecord; import java. util. logging. Logger; public type RuntimeLog { public static ultimate int MODE_DEBUG = 1; public static ultimate int MODE_RELEASE = 2; public static ultimate int errors = three; public static ultimate int caution = four; public static ultimate int details = five; public static ultimate int DEBUG = 6; public static ultimate int VERBOSE = 7; // switch this to MODE_DEBUG to exploit for in-house debugging static boolean Mode = MODE_RELEASE; static logfileName = "/sdcard/YourAppName. log" static Logger logger; static LogRecord checklist; //initiate the go browsing first use of the category and //create your customized formatter static { attempt { FileHandler fh = new FileHandler(logfileName, true); fh. setFormatter(new Formatter() { public String format(LogRecord rec) { StringBuffer buf = new StringBuffer(1000); buf. append(new java. util. Date(). getDate()); buf. append('/'); buf. append(new java. util. Date(). getMonth()); buf. append('/'); buf. append((new java. util. Date(). getYear())%100); buf. append(' '); buf. append(new java. util. Date(). getHours()); buf. append(':'); buf. append(new java. util. Date(). getMinutes()); buf. append(':'); buf. append(new java. util. Date(). getSeconds()); buf. append('\n'); go back buf. toString(); } }); logger = Logger. getLogger(logfileName); logger. addHandler(fh); } trap (IOException e) { e. printStackTrace(); } } // the log approach public static void log(int logLevel,String msg) { //don't log DEBUG and VERBOSE statements in liberate mode if (Mode == MODE_RELEASE) && (logLevel >= DEBUG)) go back; record=new LogRecord(Level. ALL, msg); list. setLoggerName(logfileName); test { switch(logLevel) { case mistakes: list. setLevel(Level. SEVERE); logger. log(record); holiday; case caution: checklist. setLevel(Level. WARNING); logger. log(record); holiday; case details: list. setLevel(Level. INFO); logger. log(record); holiday; //FINE and best degrees would possibly not paintings on a few API models //use details as an alternative case DEBUG: list. setLevel(Level. INFO); logger. log(record); holiday; case VERBOSE: list. setLevel(Level. INFO); logger. log(record); holiday; } } catch(Exception exception) { exception. printStackTrace(); } } } There are, in fact, a number of adaptations which may be used: you should use a similar mechanism to discover complicated runtime matters while you're constructing the app.

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