Android Programming Basics Core Servlets-Books Pdf

Android Programming Basics Core Servlets
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Topics in This Section, Making and testing Android projects. Basic program structure, Java based layout, XML based layout. Eclipse ADT visual layout editor, Hybrid layout, Project structure summary. 2012 Marty Hall, Making an Android, Customized Java EE Training http courses coreservlets com. Java JSF 2 PrimeFaces Servlets JSP Ajax jQuery Spring Hibernate RESTful Web Services Hadoop Android. Developed and taught by well known author and developer At public venues or onsite at your location. Review from Previous Section, Already installed, Android SDK.
Eclipse ADT Plugin, Already configured, Android SDK components updated. Eclipse preferences, Android SDK location set, At least one AVD Android Virtual Device defined. Documentation, http developer android com guide developing index html. http developer android com reference packages html. Making Your Own Android App, When you create a new app it has simple Hello World. functionality built in, So you can create and test an app without knowing.
syntax which is not discussed until next tutorial section. File New Project Android Android Project, Once you do this once next time you. can do File New Android Project, Fill in options as shown on next page. Run new project as shown previously, R click Run As. Android Application, Making Your Own Android App, Setting Project Options. New Android Project Settings, Project Name, Eclipse project name Follow naming convention you use for Eclipse.
Build Target, The Android version that you want to use For most phone apps choose. 2 2 since that is the most common version in use worldwide. Application name, Human readable app name title will be shown on Android title bar. Package name, Apps on a particular Android device must have unique packages so use. com yourCompany project, Create Activity, The name of the top level Java class. Min SDK Version, Number to match the Build Target Summarized in the Eclipse dialog but.
for details see http developer android com guide appendix api levels html. Making Your Own Android App, Setting Project Options. Eclipse project name, Android version that you want to run on. Human readable app name, Package Use naming convention to ensure uniqueness. Java class name, Number corresponding to build target. Running New App on Emulator, Builtin functionality.
Newly created projects automatically have simple Hello. World behavior, Execution steps, Same as with any project. R click Run As, Android Applicaton, Reminder do not close. emulator after testing, Emulator takes a long time. to start initially but it is, relatively fast to deploy. a new or a changed, project to the emulator, Running New App on Physical.
Android Device Phone, Unsigned apps are trivial, Just plug in phone and do normal process from Eclipse. Configure phone to allow untrusted apps, Once only See next page. Shut down emulator, Plug in phone, R click project. Run As Android Application, This installs and runs it But it is left installed after you. unplug phone and you can run it on phone in normal. Running New App on Phone, Configuring Android Device.
Enable USB debugging, Settings Applications, Development. Required USB debugging, Allows PC to send commands. Optional Stay awake, Phone device won t sleep when. connected via USB, Optional Allow mock locations, Let PC send fake GPS locations. Allow unknown sources, Settings Applications, Unknown sources.
2012 Marty Hall, Basic Program Structure, Customized Java EE Training http courses coreservlets com. Java JSF 2 PrimeFaces Servlets JSP Ajax jQuery Spring Hibernate RESTful Web Services Hadoop Android. Developed and taught by well known author and developer At public venues or onsite at your location. General Structure, Common to All Approaches, package com companyname projectname. There is no need to type the import statements by hand Just use the classes in your code. and when Eclipse marks the line as an error click on the light bulb at the left or hit Control 1. then choose to have Eclipse insert the import statements for you. import android app Activity, import android os Bundle. Apps are frequently shut down by the device This, import android widget SomeLayoutOrView lets you remember some info about the previous. invocation Covered in later lectures but for now, just know that you should always call.
super onCreate as first line of onCreate, public class SomeName extends Activity. public void onCreate Bundle savedInstanceState, super onCreate savedInstanceState. SomeLayoutOrView view createOrGetView, setContentView view. I also follow a few official Android coding conventions here 4 space indentation no s in imports s on same line as previous code Override where. appropriate Conventions are strictly enforced in official code and are used in all examples and tutorials So you might as well follow the conventions from the. 15 beginning Follow these simple ones for now and a later lecture will give coding convention details and provide an Eclipse preferences file to help with them. Three Main Approaches, Java based, Use Java to define Strings lay out window create GUI. controls and assign event handlers Like Swing programming. Use XML files to define Strings lay out window create GUI. controls and assign event handlers The Java method will read. the layout from XML file and pass it to setContentView. Use an XML file to define Strings lay out window and create. GUI controls Use Java to assign event handlers, Examples in this tutorial section.
Button that says Show Greeting Small popup message. appears when button is pressed, Implemented each of the three ways. Java Based Approach Template, public class SomeName extends Activity. public void onCreate Bundle savedInstanceState, super onCreate savedInstanceState. String message, LinearLayout window new LinearLayout this. window setVariousAttributes, Button b new Button this.
b setText Button Label, b setOnClickListener new SomeHandler. mainWindow addView b, setContentView window, private class SomeHandler implements OnClickListener. public void onClick View clickedButton, doSomething. OnClickListener is a public inner class inside View But as long as you import android view View OnClickListener you. use it just like a normal class And remember that Eclipse helps you with imports just type in the class name then. 17 either click on the light bulb or hit Control 1 to have Eclipse insert the proper import statements for you. XML Based Approach Template, public class SomeClass extends Activity. public void onCreate Bundle savedInstanceState, super onCreate savedInstanceState.
setContentView R layout main, public void handlerMethod View clickedButton. String someName getString R string some name, doSomethingWith someName. res values strings xml res layout main xml, xml version 1 0 encoding utf 8 xml version 1 0 encoding utf 8. resources LinearLayout, string name some name string TextView. Button android onClick handlerMethod, resources LinearLayout.
Hybrid Approach Template, public class SomeClass extends Activity. public void onCreate Bundle savedInstanceState, super onCreate savedInstanceState. setContentView R layout main, Button b Button findViewById R id button id. b setOnClickListener new SomeHandler, private class SomeHandler implements OnClickListener. public void onClick View clickedButton, doSomething.
Controls that need handlers are given IDs, You do not use android onClick to assign handler. 2012 Marty Hall, Java Based Layout, Customized Java EE Training http courses coreservlets com. Java JSF 2 PrimeFaces Servlets JSP Ajax jQuery Spring Hibernate RESTful Web Services Hadoop Android. Developed and taught by well known author and developer At public venues or onsite at your location. Use Java to define Strings lay out window create GUI. controls and assign event handlers, Advantages, Familiar to Java desktop developers Like approach used. for Swing SWT and AWT, Good for layouts that are dynamic i e that change based. on program logic, Disadvantages, Harder to maintain arguable but general consensus.
Works poorly with I18N, Not generally recommended except for dynamic layouts. But still acceptable for App Store Whatever works best for. your programmers and your app No code police, Code Main Method. public class SayHelloJava extends Activity, public void onCreate Bundle savedInstanceState. super onCreate savedInstanceState, String appName SayHello Application. String windowText, Press the button below to receive.
a friendly greeting from Android, String buttonLabel Show Greeting. LinearLayout mainWindow new LinearLayout this, mainWindow setOrientation LinearLayout VERTICAL. setTitle appName, TextView label new TextView this. label setText windowText, mainWindow addView label. Button greetingButton new Button this, greetingButton setText buttonLabel.
greetingButton setOnClickListener new Toaster, mainWindow addView greetingButton. setContentView mainWindow, Code Event Handler Method. private class Toaster implements OnClickListener, public void onClick View clickedButton. String greetingText Hello from Android, Toast tempMessage. Toast makeText SayHelloJava this, greetingText, Toast LENGTH SHORT.
tempMessage show, Results on Emulator, R clicked project Run As Android Application. Results on Physical Phone, Configured phone once only. Shut down emulator plugged in phone, R clicked project Run As Android Application. 2012 Marty Hall, XML Based Layout, Customized Java EE Training http courses coreservlets com. Java JSF 2 PrimeFaces Servlets JSP Ajax jQuery Spring Hibernate RESTful Web Services Hadoop Android. Developed and taught by well known author and developer At public venues or onsite at your location. Use XML files to define Strings lay out window create GUI. controls and assign event handlers, Define layout and controls in res layout main xml.
Define Strings in res values strings xml, Advantages. Easier to maintain, Works well with I18N, Can use visual layout editor in Eclipse. Standard recommended approach, along with hybrid, Disadvantages. Works poorly for dynamic layouts, More Details, res layout main xml. Define layout and controls with XML description, LinearLayout Define controls LinearLayout.
Refer to strings from strings xml with string string name. Assign event handler with android onClick, res values strings xml. Define strings used in GUI or that might change with I18N. Java code res layout main xml, Refer to layout with R layout main. Refer to strings with getString R string string name. Refer to controls with findViewById R id some id, http developer android com guide topics ui. declaring layout html, Project Layout, Refers to layout defined in res layout main xml with. R layout main, Refers to strings defined in res values strings xml with.
getString R string string name, Defines screen layout and GUI controls Optionally. assigns event handlers to controls, Refers to strings defined in res values strings xml with. string string name, Conventional for main file to be called main xml but not required If it. is foo xml then Java uses R layout foo As we will see later complex. apps have several layout files for different screens. Defines strings that are either used in GUI controls or that. might change with internationalization, Code res layout main xml. xml version 1 0 encoding utf 8, LinearLayout, xmlns android http schemas android com apk res android.
android orientation vertical These attributes android orientation. android layout width match parent etd are defined in JavaDoc API for. LinearLayout, android layout height match parent, android layout width match parent These strings are defined in. res values strings xml, android layout height wrap content. android text string window text, android text string button label. android layout width match parent, android layout height wrap content. android onClick showToast, LinearLayout, This must be a public method in main class have a.
void return type and take a View as argument No, interface needs to be implemented as it does with. 30 event handlers referred to in Java code, Code res values strings xml. xml version 1 0 encoding utf 8 app name is used for the title of the screen When you create the. project this name is used automatically but it can be overridden in. resources AndroidManifest xml All the rest are developer specified names. string name app name Say Hello Application string, string name window text. Press the button below to receive, a friendly greeting from Android. string name button label Show Greeting string, string name greeting text Hello from Android string.
main xml refers to this with string greeting text, Java refers to this with getString R string greeting text. Eclipse auto completion will recognize the names when editing. other files that use them, public class SayHelloXml extends Activity. public void onCreate Bundle savedInstanceState, super onCreate savedInstanceState. setContentView R layout main, public void showToast View clickedButton. String greetingText getString R string greeting text. Android Programming Basics Originals of Slides and Source Code for Examples Making Your Own Android App Basics Idea When you create a new app it has simple Hello World functionality built in So you can create and test an app without knowing syntax which is not discussed until next tutorial section Steps File New Project Android Android Project Once you

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