Installing Android SDK and Eclipse IDE
- Download Java Runtime Environment (JRE) or Java Development Kit (JDK)
- Try the Java Platform, Enterprise Edition (Java EE)
- Eclipse Download, get the Eclipse IDE for Java
EE Developers
- the default configuration should work just fine for the beginner
- Recommend not installing in a directory with spaces in the name
- Download Android SDK
- Basically you just unzip the SDK file
- Android Developers - Installing the Android SDK
Simple Applications
- Creating Hello World Application
- Open the Eclipse IDE
- Select File->New->Android Project
- Enter the value for the fields below as shown in figure
- Project Name -- Name of Project
- Application Name -- Name of Application .This is the Name that appear on the title bar.
- Package Name -- Namespace
- Create Activity -- Name of the Activity
- Min SDK Version -- An integer value that represents the version of the application
code, relative to other versions
- Click Finish
- Now run the Application and see what result it gives
- Result
- New Activity Running in Android Emulator
- See a text 'Hello World Hello World'
- How the Hello World program works
- Resources for the Android project are stored in res folder. It includes the subfolders layout,values and drawable.
The access to these files is done through the R variable ie accessing main.xml as R.layout.main.
- Open the string.xml file located in values folder, which is within 'res' folder. There you can see a string variable
whose value is set as 'Hello World HelloWorld!' by default.
- If you open the main.xml file located in layout folder which is within 'res' folder you can see Text property of the text box is assigned to the value of hello.
Thus at the time of running application, it displays 'Hello World HelloWorld!'
- Now open the main file called 'HelloWorld.java' located in 'src' folder. Activity based class is placed in HelloWorld.java file.
Activity is the base class for the visual, interactive components of the application. It is similar to a Form in desktop application.
Activity based class extends the activity class and overrides the Oncreate method, it specifies the action which is to be
performed when the activity is called for the first time.
- It sets
setContentView as setContentView(R.layout.main);
- Thus application displays 'Hello world Helloworld' when program runs.
- Show "The elements of an array in a List View"
- Open the Eclipse IDE
- Select File->New->Android Project
- Enter the value for the fields.
- To create an array open the string.xml file located in value folder which is within
resource folder res
- Create an array as shown below
<string-array name="Item_Array">
<item>Item First</item>
<item>Item Second </item>
</string-array>
- Now we want to declare List View object
- Open the main.xml file located in layout folder within res folder
- Declare a List View control as
<ListView
android:id="@+id/myListView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
- After creating List View contrl and String array open samples_project.java file located in src folder
- Access the list view control which is declared in string.xml as
ListView myListView = (ListView)findViewById(R.id.myListView);
- Create an object of Resources to access the string array, as
Resources myResources = getResources();
- Create an array adapter to connect the string array to the list view
final ArrayAdapter aa;
aa = new ArrayAdapter(this,android.R.layout.simple_list_item_1,myResources.getStringArray(R.array.Item_Array));
- Setting the array adpter to list view
myListView.setAdapter(aa);
- Save the application and run it
- Result will be as shown in the figure
Google Android References
- Hello, Android by Ed Burnette with
The Pragmatic Programmers, LLC
ISBN-13: 978-1-934356-17-3. Introducing Google's Mobile Development Platform
- Ed Burnette created Planet Android
- The Busy Coder's Guide to Advanced Android Development
by Mark L. Murphy by CommonsWare, LLC.
- The Busy Coder's Guide to Android Programming Tutorials
by Mark L. Murphy by CommonsWare, LLC.
- The Busy Coder's Guide to Android Development
by Mark L. Murphy by CommonsWare, LLC.
- the default configuration should work just fine for the beginner
- Recommend not installing in a directory with spaces in the name
- Basically you just unzip the SDK file
- Open the Eclipse IDE
- Select File->New->Android Project
- Enter the value for the fields below as shown in figure
- Project Name -- Name of Project
- Application Name -- Name of Application .This is the Name that appear on the title bar.
- Package Name -- Namespace
- Create Activity -- Name of the Activity
- Min SDK Version -- An integer value that represents the version of the application code, relative to other versions
- Click Finish
- Now run the Application and see what result it gives
- New Activity Running in Android Emulator
- See a text 'Hello World Hello World'
- Resources for the Android project are stored in res folder. It includes the subfolders layout,values and drawable. The access to these files is done through the R variable ie accessing main.xml as R.layout.main.
- Open the string.xml file located in values folder, which is within 'res' folder. There you can see a string variable whose value is set as 'Hello World HelloWorld!' by default.
- If you open the main.xml file located in layout folder which is within 'res' folder you can see Text property of the text box is assigned to the value of hello. Thus at the time of running application, it displays 'Hello World HelloWorld!'
- Now open the main file called 'HelloWorld.java' located in 'src' folder. Activity based class is placed in HelloWorld.java file. Activity is the base class for the visual, interactive components of the application. It is similar to a Form in desktop application. Activity based class extends the activity class and overrides the Oncreate method, it specifies the action which is to be performed when the activity is called for the first time.
- It sets
setContentView as setContentView(R.layout.main);
- Thus application displays 'Hello world Helloworld' when program runs.
- Show "The elements of an array in a List View"
- Open the Eclipse IDE
- Select File->New->Android Project
- Enter the value for the fields.
- To create an array open the string.xml file located in value folder which is within resource folder res
- Create an array as shown below
<string-array name="Item_Array">
<item>Item First</item>
<item>Item Second </item>
</string-array>
- Now we want to declare List View object
- Open the main.xml file located in layout folder within res folder
- Declare a List View control as
<ListView
android:id="@+id/myListView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/> - After creating List View contrl and String array open samples_project.java file located in src folder
- Access the list view control which is declared in string.xml as
ListView myListView = (ListView)findViewById(R.id.myListView);
- Create an object of Resources to access the string array, as
Resources myResources = getResources();
- Create an array adapter to connect the string array to the list view
final ArrayAdapter
aa;
aa = new ArrayAdapter(this,android.R.layout.simple_list_item_1,myResources.getStringArray(R.array.Item_Array)); - Setting the array adpter to list view
myListView.setAdapter(aa);
- Save the application and run it
- Result will be as shown in the figure
Google Android References
- Hello, Android by Ed Burnette with
The Pragmatic Programmers, LLC
ISBN-13: 978-1-934356-17-3. Introducing Google's Mobile Development Platform
- Ed Burnette created Planet Android
- The Busy Coder's Guide to Advanced Android Development by Mark L. Murphy by CommonsWare, LLC.
- The Busy Coder's Guide to Android Programming Tutorials by Mark L. Murphy by CommonsWare, LLC.
- The Busy Coder's Guide to Android Development by Mark L. Murphy by CommonsWare, LLC.