Android Application Development for Java Programmers

Android Application Development for Java Programmers

Language: English

Pages: 320

ISBN: 1133593542

Format: PDF / Kindle (mobi) / ePub


We are witnessing an explosion in the use of handheld mobile devices worldwide. Recent polls have shown that many people own and use more than one mobile device, and some use as many as three or four. Smart phones, tablets, and handheld game devices are ubiquitous. The Android operating system (OS)--an open-source OS with Linux at its core--is an ever-more-popular OS on these devices. ANDROID APPLICATION DEVELOPMENT FOR JAVA PROGRAMMERS provides an ideal, quick-start tutorial for anyone interested in developing Android mobile device applications, from the student or hobbyist familiar with Java, to the experienced programmer wanting to enter the mobile device application market. Because the Android development software provides an emulator program, the reader doesn't need to own an Android mobile device to take advantage of this book. Although the code presented in the book can be used to produce complete running applications, the goal is to inspire the reader to bring his own mobile application ideas to reality in a short time. The book is organized in a logical, evolutionary manner starting with configuration of the development environment and ending with two comprehensive projects. The beginning chapters cover basic application components and configuration of the Android emulator and basic user interface design, whereas later chapters cover how to accomplish more involved areas such as use of GPS, graphics, networking, and databases.

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android:layout_width="fill_parent" android:layout_height="wrap_content" android:entries="@array/NewEnglandStates" android:prompt="@string/spinner_prompt" 75 76 Chapter 4 n Controls and the User Interface > In the Spinner element, the android:prompt places a string at the top of the list when it is opened. It is optional, and without it the first choice in the

xjump=(int)(screenwidth/series.size()); myCanvas.drawText("First point is p(0)", 5.0f, 10.0f, myPaint); //draw a border line on the bottom of the graph myCanvas.drawLine(0f,screenheight-1.0f, screenwidth,screenheight-1.0f, myPaint); myPaint.setColor(Color.BLUE); //below, the constant 46 represents the number of positions on the scale 0-45 for(int ct=0;ct

that write to a Bitmap java.lang.Object Methods used in this chapter: boolean compress(Bitmap. CommpressFormat format, int quality, OutputStream Writes a compressed version of the Bitmap to the output stream stream) Other commonly used methods: void copyPixelsFromBuffer (Buffer src) static Bitmap createBitmap (Bitmap source) final int getByteCount() int getDensity() final int getHeight() final int getWidth() void writeParcel(Parcel p, int flags) Copy the pixels from the buffer, beginning at

please consult the guide on the following 121 122 Chapter 6 n Find a Location with Google Maps web page: www.microsoft.com/resources/documentation/windows/xp/all/ proddocs/en-us/ntcmds.mspx, specifically the chdir or cd command. 3. When you have reached the location of the debug.keystore file, type the following command: keytool –v -list -keystore debug.keystore (enter) If you are prompted for a password, just press Enter. You will see many fingerprints using different mathematical

popularity of the Java programming language, along with the extensive class library associated with the ADK, makes it an attractive development platform. As you might expect as a Java programmer, each application runs on its own Java virtual machine (JVM). However, Android supplies its own optimized JVM called the Dalvik virtual machine. Android applications are composed of one or more of four types of core components. These are activities, the base of all of the examples in this book; services;

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