Difference between revisions of "Teams Winter 2011/team1/Android/Implement Delete Option"
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=== 5. Implement Delete Option === | === 5. Implement Delete Option === | ||
5.1. In the <code>ContactList</code> class add the following lines to the <code>onOptionsItemSelected</code> method: | 5.1. In the <code>ContactList</code> class add the following lines to the <code>onOptionsItemSelected</code> method: | ||
| − | < | + | <source lang="java"> |
case R.id.item2: | case R.id.item2: | ||
Student deleteStudent = (Student)contactsList.getSelectedItem(); | Student deleteStudent = (Student)contactsList.getSelectedItem(); | ||
| Line 11: | Line 11: | ||
} | } | ||
break; | break; | ||
| − | </ | + | </source> |
5.2. Add the method to generate the dialog window to alert if no contact has been selected: | 5.2. Add the method to generate the dialog window to alert if no contact has been selected: | ||
| − | < | + | <source lang="java"> |
public void showDialog(String message){ | public void showDialog(String message){ | ||
AlertDialog alertDialog = new AlertDialog.Builder(this).create(); | AlertDialog alertDialog = new AlertDialog.Builder(this).create(); | ||
| Line 19: | Line 19: | ||
alertDialog.show(); | alertDialog.show(); | ||
} | } | ||
| − | </ | + | </source> |
5.3. Run the application, select one student from the list, press menu and select "Delete Student":<br/> | 5.3. Run the application, select one student from the list, press menu and select "Delete Student":<br/> | ||
[[Image: A_delete1.png | 450px]]<br/> | [[Image: A_delete1.png | 450px]]<br/> | ||
5.4. The list should get updated: <br/> | 5.4. The list should get updated: <br/> | ||
| − | [[Image: A_delete2.png | 450px ]] | + | [[Image: A_delete2.png | 450px ]]<br/> |
| + | 5.5. Run the application again, but this time don't select any student and try to execute the delete option. You should get the following message:<br/> | ||
| + | [[Image: A_view2.png | 450px]] | ||
Latest revision as of 11:19, 28 March 2011
5. Implement Delete Option
5.1. In the ContactList class add the following lines to the onOptionsItemSelected method:
case R.id.item2:
Student deleteStudent = (Student)contactsList.getSelectedItem();
if (deleteStudent != null){
studentList.removeElement(deleteStudent);
displayData(studentList);
} else {
showDialog("No contact was selected!");
}
break;5.2. Add the method to generate the dialog window to alert if no contact has been selected:
public void showDialog(String message){
AlertDialog alertDialog = new AlertDialog.Builder(this).create();
alertDialog.setMessage(message);
alertDialog.show();
}5.3. Run the application, select one student from the list, press menu and select "Delete Student":
5.4. The list should get updated:
5.5. Run the application again, but this time don't select any student and try to execute the delete option. You should get the following message:
