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=== 3. Adding Functionality to Main Screen Elements ===
3.1. Create class <code>Student</code>. It is holder for contacts:
<presource lang="java"> package cs.ecl.team1.android; public class Student { private String firstName; private String lastName; private String email; /** * Constructs a Student * @param firstName The student's first name * @param lastName The student's last name * @param email The student's email address */ public Student(String firstName, String lastName, String email) { this.firstName = firstName; this.lastName = lastName; this.email = email; } public String getEmail() { return email; } public String getName() { return firstName + " " + lastName; } public String toString() { return firstName + " " + lastName; } // added so that student info can be edited public String getFirstname(){ return this.firstName; } public String getLastName(){ return this.lastName; } public void setEmail(String email){ this.email = email; } public void setFirstName( String firstName){ this.firstName=firstName; } public void setLastName(String lastName){ this.lastName = lastName; } } </presource>
3.2. Inside the <code>ContractList</code> class create a Vector of objects <code>Student</code>:
<presource lang="java">
private Vector<Student> studentList;
</presource>
3.3. Populate the Vector:
<presource lang="java">
public Vector<Student> getList(){
studentList = new Vector<Student>();
return studentList;
}
</presource>
3.4. Create the method that generates list on the screen:
<presource lang="java">
public void displayData(){
contactsList.setAdapter(adapter);
}
</presource>
3.5. Populate the listView on the main screen:
<presource lang="java">
ListAdapter adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, studentList);
ListView contactsList = (ListView) findViewById(R.id.listView1);
contactsList.setAdapter(adapter);
</presource>
3.6. Add list to the main screen on create:
<presource lang="java">
@Override
public void onCreate(Bundle savedInstanceState) {
}
</presource>3.57. run Run the application:<br/>
[[Image: A_main5.png | 450px]]<br/>
3.8. Add the functionality to "Search" button by implementing the <code>onClickListener()</code>:
<source lang="java">
searchButton.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
EditText contact = (EditText)findViewById(R.id.editText1);
String search = contact.getText().toString();
if(search.length() == 0){
displayData(studentList);
else {
Vector<Student> searchResults=new Vector<Student>();
for(Student i:studentList){
if ( i.getName().toLowerCase().contains(search.toLowerCase())){
searchResults.add(i);
}
}
displayData(searchResults);
}
}
});
</source>
3.9. Run the application, type in search text in the Text Field and click search button:<br/>
[[Image: A_search.png | 450px]]<br/>
