COMP 365 Android Development

 Developing for Android  XML for user interface formatting and other scripting  Java for programming

 XML is a markup language  Uses tags to contain data like so data  Can close tags without using data like so  Can contain attributes  Can nest tags within each other

 main_activity.xml under res-> layout in Eclipse to change the XML  Change the layout by changing the first tag  LinearLayout  RelativeLayout  WebView  Attributes for layout  android:layout_width  android:orientation

 EditText  Add within the layout tag  Attributes  android:layout_width & android:layout_height  android:id  Adding a string to display in the textbox  Res → values → string in Ecplise  text

 Under res → layout  Button  Attributes  android:text  Link to the string resource  android:text =

 Adding an onClick event to the button  Attribute – android:onClick=”functionName”  FunctionName has a View object as a parameter, and returns void

When the onClick event activates, bring up an Alert Dialog //Create a new Dialog AlertDialog.Builder alert = new AlertDialog.Builder( this ); //Get a reference to the EditText field EditText userInput = (EditText)findViewById(R.id.edit_message); //Get the text from the EditText field String message = userInput.getText().toString(); //Name of the Dialog alert.setTitle(“User input is:”); //Name of the message alert.setMessage( message ); //Give the Dialog an “Ok” button, not necessary though alert.setPositiveButton(“Ok”, null); //show the dialog alert.show();