Difference between revisions of "Basic Android"

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[[Category:Tech]]
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[[Category:Tutorial]]
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[[Category:Video Tutorial]]
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=Android Basics=
 
=Android Basics=
−
*App Inventor
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−
:Pretty basic web interface an blocks editor to build simple android apps  
+
 
−
http://appinventor.googlelabs.com/about/
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*Install 32 or 64  bit Java JDK http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
−
**Setup App Inventor http://appinventor.googlelabs.com/learn/setup/
+
 
 +
*App Inventor Pretty basic web interface an blocks editor to build simple android apps http://appinventor.mit.edu/about/  
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**Setup App Inventor http://appinventor.mit.edu/
 +
 
 
*Android SDK
 
*Android SDK
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**http://developer.android.com/sdk/index.html
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**Download Android Studio
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**For SDK path we will use c:\user\Android
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*Android NDK
 
*Android NDK
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**we're not covering this http://developer.android.com/sdk/ndk/index.html
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 +
==Basics==
 +
 +
For the demo please login to https://storefront.iam.local/Citrix/IAMVDIWeb
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 +
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*src folder containing all the source
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*res folder containing all the resources
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 +
folder hierarchy explained http://developer.android.com/tools/projects/index.html
 +
 +
First app demo http://developer.android.com/training/basics/firstapp/running-app.html
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 +
App lifecycle http://developer.android.com/guide/components/activities.html
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 +
http://developer.android.com/images/activity_lifecycle.png
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==Resources==
 +
 +
No DPI or PPI Andoid uses dp density independent pixels or sp scale interdependent pixels http://developer.android.com/guide/topics/resources/more-resources.html#Dimension
 +
 +
also see supporting multiple screens http://developer.android.com/guide/practices/screens_support.html
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==Activities==
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Activity life cycle http://developer.android.com/guide/topics/fundamentals/activities.html#Lifecycle
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Get an instance of an object from the R class
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<syntaxhighlight lang="java">/** Called when the activity is first created. */
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    @Override
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    public void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        setContentView(R.layout.main);
 +
       
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        //Get the Button and the TextView from the Resource class
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        Button btn = (Button)this.findViewById(R.id.button1);
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        final TextView tv = (TextView)this.findViewById(R.id.textView1); 
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        String s = "hello";
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        tv.setText(s);
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    }
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</syntaxhighlight>
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notice the cast to the type also notice that the TextView is marked as [http://en.wikipedia.org/wiki/Final_%28Java%29 final]
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this is so that we can use it in an inner method
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 +
handle a click event
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<syntaxhighlight lang="java">
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btn.setOnClickListener(new View.OnClickListener() {
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 +
@Override
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public void onClick(View v) {
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// TODO Auto-generated method stub
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tv.setText(d.About());
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}
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});</syntaxhighlight>
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==Events==
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Lots more good reading http://developer.android.com/guide/topics/fundamentals.html
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==AVD==
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==Dog Class in java==
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<syntaxhighlight lang="java">
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public class Dog {
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public String Name;
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public int Weight;
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public String BarkSound;
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//Constructor
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public Dog()
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{
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this.Name = "fido";
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this.Weight = 1;
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this.BarkSound = "woof";
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}
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public void Eat()
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{
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this.Weight++;
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}
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public void Poop()
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{
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this.Weight--;
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}
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public String About()
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{
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return String.format("Hello my name is %s. I weigh %s lbs",
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this.Name, this.Weight);
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}
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 +
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}
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</syntaxhighlight>
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=In Class Demo=
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*Get and install Android Studio this demo uses .086 https://developer.android.com/sdk/installing/studio.html
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*Start Android Studio
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*Select Configure
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[[File:AndroidStudioConfigure.png]]
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*Select Android SDK Manager
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[[File:AndroidStudioSDKManager.png]]
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*Make sure you have a current SDK for this Demo we will use 23.05
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[[File:AndroidSDKManagerCurrentVersion.PNG|Alt]]
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*Go back to the main menu and select New Project
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[[File:AndroidStudioNewProject.PNG|Alt]]
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*Name the Project OOPDog and select Next
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[[File:AnroidStudioConfigureNewProject.PNG|Alt]]
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*Select a Minimum SDK for this demo we will use API15 : IceCreamSandwich
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[[File:AnroidStudioConfigureNewProjectSDK.PNG|Alt]]
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*Select Blank Activity for the Project template
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[[File:AndroidStudioBlankActivity.PNG|Alt]]
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*The defaults are fine for the activity name select next
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[[File:AnroidStudioNewProjectAcvtivity.PNG|Alt]]
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*After a minute or so you can open the Project window if it isn't already open Att-1 or View/Tool Windows/Project
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[[File:AndroidStudioShowOpenMyActivity.png|Alt]]
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*Add Dog class
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[[File:AndroidStudioNewClass.png|Alt]]
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*Name the class Dog
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[[File:AndroidStudioNewClassName.PNG|Alt]]
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*Here is the c# dog class we have been using we need to change it a bit
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[[Android Studio CSharpDog Code]]
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[[File:AndroidStudioCSharpDog.PNG|Alt]]
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*In Java [[Android Studio JavaDog]]
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[[File:AndroidStudioJavaDog.PNG|Alt]]

Revision as of 19:32, 5 April 2016


Android Basics

Basics

For the demo please login to https://storefront.iam.local/Citrix/IAMVDIWeb


  • src folder containing all the source
  • res folder containing all the resources

folder hierarchy explained http://developer.android.com/tools/projects/index.html

First app demo http://developer.android.com/training/basics/firstapp/running-app.html

App lifecycle http://developer.android.com/guide/components/activities.html

activity_lifecycle.png

Resources

No DPI or PPI Andoid uses dp density independent pixels or sp scale interdependent pixels http://developer.android.com/guide/topics/resources/more-resources.html#Dimension

also see supporting multiple screens http://developer.android.com/guide/practices/screens_support.html

Activities

Activity life cycle http://developer.android.com/guide/topics/fundamentals/activities.html#Lifecycle

Get an instance of an object from the R class 

/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        //Get the Button and the TextView from the Resource class
        Button btn = (Button)this.findViewById(R.id.button1);
        final TextView tv = (TextView)this.findViewById(R.id.textView1);  
        String s = "hello";
        tv.setText(s);
    }

notice the cast to the type also notice that the TextView is marked as final 
this is so that we can use it in an inner method

handle a click event 

btn.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				tv.setText(d.About());
			}
		});

Events

Lots more good reading http://developer.android.com/guide/topics/fundamentals.html


AVD

Dog Class in java

public class Dog {

	public String Name;
	public int Weight;
	public String BarkSound;
	
	//Constructor
	public Dog()
	{
		this.Name = "fido";
		this.Weight = 1;
		this.BarkSound = "woof";
	}
	
	public void Eat()
	{
		this.Weight++;
	}
	public void Poop()
	{
		this.Weight--;
	}
	
	public String About()
	{
		return String.format("Hello my name is %s. I weigh %s lbs",	
				this.Name, this.Weight);
	}
	
	
}

In Class Demo

AndroidStudioConfigure.png

  • Select Android SDK Manager

AndroidStudioSDKManager.png

  • Make sure you have a current SDK for this Demo we will use 23.05

Alt

  • Go back to the main menu and select New Project

Alt

  • Name the Project OOPDog and select Next

Alt

  • Select a Minimum SDK for this demo we will use API15 : IceCreamSandwich

Alt

  • Select Blank Activity for the Project template

Alt

  • The defaults are fine for the activity name select next

Alt

  • After a minute or so you can open the Project window if it isn't already open Att-1 or View/Tool Windows/Project

Alt

  • Add Dog class

Alt

  • Name the class Dog

Alt

  • Here is the c# dog class we have been using we need to change it a bit

Android Studio CSharpDog Code

Alt

Alt

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