Difference between revisions of "Teams Winter 2011/team1/Android/Implement Delete Option"
(Created page with '=== 5. Implement Delete Option === 5.1. In the <code>ContactList</code> class add the following lines to the <code>onOptionsItemSelected</code> method: <pre> case R.id.item2:…') |
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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(); | |
| − | displayData(); | + | if (deleteStudent != null){ |
| + | studentList.removeElement(deleteStudent); | ||
| + | displayData(studentList); | ||
| + | } else { | ||
| + | showDialog("No contact was selected!"); | ||
| + | } | ||
break; | break; | ||
| − | </ | + | </source> |
| − | 5.2. Run the application, select one student from the list, press menu and select "Delete Student":<br/> | + | 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){ | ||
| + | AlertDialog alertDialog = new AlertDialog.Builder(this).create(); | ||
| + | alertDialog.setMessage(message); | ||
| + | alertDialog.show(); | ||
| + | } | ||
| + | </source> | ||
| + | 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. | + | 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:
