Teams Winter 2011/team1/Android/Adding Functionality to Main Screen Elements

3. Adding Functionality to Main Screen Elements

3.1. Create class Student. It is holder for contacts:

  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;
    }

}

3.2. Inside the ContractList class create a Vector of objects Student:

     private Vector<Student> studentList;

3.3. Populate the Vector:

     public Vector<Student> getList(){
        studentList = new Vector<Student>();
       
        studentList.addElement(new Student("Anastasia", "Semionova", "asemionova1@learn.senecac.on.ca"));
        studentList.addElement(new Student("Minoo", "Ziaei", "minoo.ziaei@senecac.on.ca"));
        studentList.addElement(new Student("Ladan", "Zadeh", "lzahiroleslamzadeh@learn.senecac.on.ca"));
        studentList.addElement(new Student("Sergiu", "Ecob", "secob@learn.senecac.on.ca"));
        return studentList;
      }

3.4. Create the method that generates list on the screen:

    public void displayData(){        
       
        ListAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, studentList);
        contactsList = (ListView) findViewById(R.id.listView1);
        contactsList.setAdapter(adapter);
    }

3.5. Populate the listView on the main screen:

   ListAdapter adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, studentList);
        ListView contactsList = (ListView) findViewById(R.id.listView1);
        contactsList.setAdapter(adapter);

3.6. Add list to the main screen on create:

  @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        studentList = getList();       
        displayData();
       
    }

3.7. Run the application:

3.8. Add the functionality to "Search" button by implementing the onClickListener():

  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);
                }
            }
        });

3.9. Run the application, type in search text in the Text Field and click search button: