2. Eclipse
• Eclipse is a multi-language software development
environment comprising an integrated development
environment (IDE)
• Users can extend its abilities by installing plug-ins written for
the Eclipse Platform
• It is written mostly in Java
5. DDMS
• Android ships with a debugging tool called the Dalvik Debug
Monitor Server (DDMS)
• which provides:
– port-forwarding services
– screen capture on the device
– thread and heap information on the device
– LogCat process
14. Manifest File
• Manifest presents essential information about the application to the
Android system, information the system must have before it can run any of
the application's code.
• Elements
• Attributes
• Class names
• Multiple values
• Resource values
• String values
15. App's Launcher Activity
• The main activity for your app must be declared in the manifest with
these parameters.
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
16. Questions You need to Ask
• What is AndroidManifest.xml ?
• Why there is a .java file in src/ directory ?
• What do we put in res/ directory ?
• Inside res/ what are these ?
– drawable-hdpi/
– layout/
– values/
18. Values
• Android will run on many devices in many regions
• Whenever the application runs in a locale for which you have
not provided locale-specific text, Android will load the default
strings from res/values/strings.xml
• Different qualifiers can be used for different locales like
res/values-fr
21. Drawable – What are they?
• A Drawable is a general abstraction for "something that can
be drawn."
• Unlike a View, a Drawable does not have any facility to
receive events or otherwise interact with the user.
23. Types of Event Listeners
• onClick() From View.OnClickListener
• onLongClick From View.OnLongClickListener
• onKey() From View.OnKeyListener
• onTouch() From View.OnTouchListener
25. Supporting Different Screens
• Android runs on a variety of devices that offer different
screen sizes and densities
• System provides APIs that allow you to control your
application's UI for specific screen sizes and densities
• res/layout/my_layout.xml // layout for normal screen size ("default")
• res/layout-small/my_layout.xml // layout for small screen size
• res/layout-large/my_layout.xml // layout for large screen size
• res/layout-xlarge/my_layout.xml // layout for extra large screen size
26. Supporting Different Screens
• xlarge screens are at least 960dp x 720dp
• large screens are at least 640dp x 480dp
• normal screens are at least 470dp x 320dp
• small screens are at least 426dp x 320dp
such as development toolkits for other programming languages, and can write and contribute their own plug-in modules.
The emulator lets you develop and test Android applications without using a physical device.
Java compilers convert your code from human readable Java source files to something called “bytecode” in the Java world. “Bytecode” is interpreted by a JVM, which operates much like a physical CPU might operate on machine code, to actually execute the compiled code. Performance - Java performance in generally second only to C/C++ in common language performance comparisons. In the Java programming language and environment, a just-in-time (JIT) compiler is a program that turns Java bytecode (a program that contains instructions that must be interpreted) into instructions that can be sent directly to the processor.The just-in-time compiler comes with the virtual machine and is used optionally. It compiles the bytecode into platform-specific executable code that is immediately executed
Java compilers convert your code from human readable Java source files to something called “bytecode” in the Java world. “Bytecode” is interpreted by a JVM, which operates much like a physical CPU might operate on machine code, to actually execute the compiled code. Performance - Java performance in generally second only to C/C++ in common language performance comparisons. In the Java programming language and environment, a just-in-time (JIT) compiler is a program that turns Java bytecode (a program that contains instructions that must be interpreted) into instructions that can be sent directly to the processor.The just-in-time compiler comes with the virtual machine and is used optionally. It compiles the bytecode into platform-specific executable code that is immediately executed
Java compilers convert your code from human readable Java source files to something called “bytecode” in the Java world. “Bytecode” is interpreted by a JVM, which operates much like a physical CPU might operate on machine code, to actually execute the compiled code. Performance - Java performance in generally second only to C/C++ in common language performance comparisons. In the Java programming language and environment, a just-in-time (JIT) compiler is a program that turns Java bytecode (a program that contains instructions that must be interpreted) into instructions that can be sent directly to the processor.The just-in-time compiler comes with the virtual machine and is used optionally. It compiles the bytecode into platform-specific executable code that is immediately executed
Adv. Question : What is the range of primitive data types ?Initalization:If no value is assigned prior to use, then the compiler will give an errorJava sets primitive variables to zero or false in the case of a boolean variableAll object references are initially set to null
