容易的添加item

简单的添加item

很多人不是很理解如何添加数据

这里是最简单的一种

public class Demonstrate extends ListActivity{    private static final int ADD_ITEM = 0;    private static final int REMOVE_ITEM = 1;    private static final int EXIT_ITEM = 2;    private ArrayAdapter<String> dataAdapter;    private Dialog editorDialog = null;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        dataAdapter = new ArrayAdapter<String>(this, R.layout.item,            R.id.itemName);        dataAdapter.add("apple");        dataAdapter.add("orange");        dataAdapter.add("tomato");        setListAdapter(dataAdapter);    }    @Override    public boolean onCreateOptionsMenu(Menu menu)    {        Resources resource = getApplicationContext().getResources();        menu.add(Menu.NONE, ADD_ITEM, ADD_ITEM,            resource.getText(R.string.ADD_ITEM)).setIcon(R.drawable.add);        menu.add(Menu.NONE, REMOVE_ITEM, REMOVE_ITEM,            resource.getText(R.string.REMOVE_ITEM)).setIcon(R.drawable.remove);        menu.add(Menu.NONE, EXIT_ITEM, EXIT_ITEM,            resource.getText(R.string.EXIT_ITEM)).setIcon(R.drawable.exit);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item)    {        switch (item.getItemId())        {        case ADD_ITEM:            showDialog(0);            break;        case REMOVE_ITEM:            dataAdapter.remove(dataAdapter.getItem(dataAdapter.getCount() - 1));            break;        case EXIT_ITEM:            finish();        }        return false;    }    @Override    protected Dialog onCreateDialog(int id)    {        Dialog editor = editorDialog;        if (editorDialog == null)        {            editor = createEditorDialog();        }        return editor;    }    private Dialog createEditorDialog()    {        AlertDialog.Builder builder = new AlertDialog.Builder(this);        builder.setTitle(R.string.addDialogTitle);        View content = getLayoutInflater().inflate(R.layout.editor,            (ViewGroup) findViewById(R.id.editLayout));        builder.setView(content);        builder.setPositiveButton(R.string.addButtonLabel,            new DialogInterface.OnClickListener()            {                public void onClick(DialogInterface dialog, int which)                {                    Dialog source = (Dialog) dialog;                    EditText nameField = (EditText) source                        .findViewById(R.id.itemField);                    String name = nameField.getText().toString();                    EditText timesField = (EditText) source                        .findViewById(R.id.timesField);                    Integer times = Integer.valueOf(timesField.getText()                        .toString());                    if ((name.length() > 0) && (times > 0))                    {                        for (int count = 0; count < times; count++)                        {                            dataAdapter.add(name);                        }                    }                    dialog.dismiss();                }            });        builder.setNegativeButton(R.string.cancelButtonLabel,            new DialogInterface.OnClickListener()            {                public void onClick(DialogInterface dialog, int which)                {                    dialog.dismiss();                }            });        return builder.create();    }}

?直接用 dataAdapter 是不需要唤醒的