I know Justin has been helping people in this forum for a long time,
so perhaps he is tired of repeating it, but since this is a beginner's
group, it is worth repeating the detailed steps for how to do this.
To see the Logcat output in Eclipse, it is easiest to:
1) switch to DDMS perspective: (Window>Open Perspective>DDMS)
2) find the tab labeled "LogCat" on the lower left (assuming DDMS
perspective reset to defaults)
3) front and maximize the tab (the box is on the top far right of this
window) so you can read several lines at once.
Given the symptoms the OP describes, he will probably find a
NullPointer Exception in the LogCat output, whether he is running in
Debug or not.
On Apr 26, 7:48 pm, Justin Anderson <janderson....@gmail.com> wrote:
> Debug it and look at the logcat info... It will give you more information
> about the problem.
>
> ----------------------------------------------------------------------
> There are only 10 types of people in the world...
> Those who know binary and those who don't.
> ----------------------------------------------------------------------
>
> On Mon, Apr 26, 2010 at 8:31 PM, ajb468 <ajb...@gmail.com> wrote:
> > I am creating a sample example from a book. Its called "To Do List."
> > I'm at the point where I am working with the Options menu. I have the
> > options of adding and removing an item to a list. I can add items to a
> > list but every time I remove an item, the program "Stopped
> > Unexpectedly." Everything in my code seems to be fine. Ill show a few
> > sections of the code that have to do with the view.
>
> > static final private int ADD_NEW_TODO = Menu.FIRST;
> > static final private int REMOVE_TODO = Menu.FIRST + 1;
> > private boolean addingNew = false; // True if myEditText is visible.
> > False if not.
> > private ArrayList<String> todoItems;
> > private ListView myListView;
> > private EditText myEditText;
> > private ArrayAdapter<String> aa;
>
> > @Override
> > public void onCreate(Bundle savedInstanceState) {
> > super.onCreate(savedInstanceState);
> > setContentView(R.layout.main);
> > myListView = (ListView) findViewById(R.id.myListView);
> > myEditText = (EditText) findViewById(R.id.myEditText);
> > todoItems = new ArrayList<String>();
> > int resID = R.layout.todolist_item;
> > final ArrayAdapter<String> aa;
> > aa = new ArrayAdapter<String>(this, resID, todoItems);
> > myListView.setAdapter(aa);
> > registerForContextMenu(myListView);
> > myEditText.setOnKeyListener(new OnKeyListener() {
> > public boolean onKey(View v, int keyCode, KeyEvent
> > event) {
> > if (event.getAction() ==
> > KeyEvent.ACTION_DOWN)
> > if (keyCode == KeyEvent.KEYCODE_1) {
> > todoItems.add(0,
> > myEditText.getText().toString());
> > myEditText.setText("");
> > aa.notifyDataSetChanged();
> > cancelAdd();
> > return true;
> > }
> > return false;
> > }
> > });
> > }
>
> > @Override
> > public boolean onCreateOptionsMenu(Menu menu) {
> > super.onCreateOptionsMenu(menu);
> > // Create and add new menu items.
> > MenuItem itemAdd = menu.add(0, ADD_NEW_TODO, Menu.NONE,
> > R.string.add_new);
> > MenuItem itemRem = menu.add(0, REMOVE_TODO, Menu.NONE,
> > R.string.remove);
> > // Assign icons
> > itemAdd.setIcon(R.drawable.add_new_item);
> > itemRem.setIcon(R.drawable.remove_item);
> > // Allocate shortcuts to each of them.
> > itemAdd.setShortcut('0', 'a');
> > itemRem.setShortcut('1', 'r');
> > return true;
> > }
>
> > @Override
> > public boolean onOptionsItemSelected(MenuItem item) {
> > super.onOptionsItemSelected(item);
> > int index = myListView.getSelectedItemPosition();
> > switch (item.getItemId()) {
> > case (REMOVE_TODO): {
> > if (addingNew) {
> > cancelAdd();
> > } else {
> > removeItem(index);
> > }
> > return true;
> > }
> > case (ADD_NEW_TODO): {
> > addNewItem();
> > return true;
> > }
> > }
> > return false;
> > }
>
> > private void removeItem(int _index) {
> > todoItems.remove(0);
> > aa.notifyDataSetChanged();
> > }
>
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