android arraylist 实现 listview

package com.menu; import java.util.ArrayList; import android.app.Activity; import android.app.ListActivity; import android.content.ComponentName; import android.content.ContentUris; import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.util.Log; import android.view.ContextMenu; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ContextMenu.ContextMenuInfo; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.SimpleCursorAdapter; public class hellomenu extends ListActivity { public static final int MENU_ITEM_DELETE = Menu.FIRST; public static final int MENU_ITEM_INSERT = Menu.FIRST + 1; private String note_name; private ArrayList note_array; /* * private static final String[] PROJECTION = new String[] { Notes._ID, // 0 * Notes.TITLE, // 1 }; */ /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // setContentView(R.layout.listnote); Cursor cursor; note_array = new ArrayList(); for (int i = 0; i < 3; i++) { note_array.add("test" + Integer.toString(i)); } ListAdapter adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, note_array); getListView().setOnCreateContextMenuListener(this); setListAdapter(adapter); // this.registerForContextMenu(getListView()); } @Override public boolean onCreateOptionsMenu(Menu menu) { // TODO Auto-generated method stub menu.add(0, MENU_ITEM_INSERT, 0, R.string.menu_insert).setShortcut('3', 'a').setIcon(android.R.drawable.ic_menu_add); // Generate any additional actions that can be performed on the // overall list. In a normal install, there are no additional // actions found here, but this allows other applications to extend // our menu with their own actions. Intent intent = new Intent(null, getIntent().getData()); intent.addCategory(Intent.CATEGORY_ALTERNATIVE); menu .addIntentOptions(Menu.CATEGORY_ALTERNATIVE, 0, 0, new ComponentName(this, hellomenu.class), null, intent, 0, null); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case MENU_ITEM_INSERT: // Launch activity to insert a new item String ls_note; Intent intent_add = new Intent(this, note_edit.class); startActivityForResult(intent_add, 100); return true; } return super.onOptionsItemSelected(item); } @Override public void onCreateContextMenu(ContextMenu menu, View view, ContextMenuInfo menuInfo) { AdapterView.AdapterContextMenuInfo info; try { info = (AdapterView.AdapterContextMenuInfo) menuInfo; } catch (ClassCastException e) { Log.e("NotesList", "bad menuInfo", e); return; } String note[] = new String[3]; note[1] = getListAdapter().getItem(info.position).toString(); if (note[1] == null) { // For some reason the requested item isn't available, do nothing return; } // Setup the menu header menu.setHeaderTitle(note[1]); // Add a menu item to delete the note menu.add(0, MENU_ITEM_DELETE, 0, R.string.menu_delete); } @Override public boolean onPrepareOptionsMenu(Menu menu) { super.onPrepareOptionsMenu(menu); final boolean haveItems = getListAdapter().getCount() > 0; // If there are any notes in the list (which implies that one of // them is selected), then we need to generate the actions that // can be performed on the current selection. This will be a combination // of our own specific actions along with any extensions that can be // found. if (haveItems) { // This is the selected item. // String note_c=getListView().getSelectedItem().toString(); // Build menu... always starts with the EDIT action... /* * Intent[] specifics = new Intent[1]; specifics[0] = new * Intent(Intent.ACTION_EDIT, null); MenuItem[] items = new * MenuItem[1]; // ... is followed by whatever other actions are * available... Intent intent = new Intent(this, hellomenu.class); * intent.addCategory(Intent.CATEGORY_ALTERNATIVE); * menu.addIntentOptions(Menu.CATEGORY_ALTERNATIVE, 0, 0, null, * specifics, intent, 0, items); // Give a shortcut to the edit * action. if (items[0] != null) { items[0].setShortcut('1', 'e'); } } * else { menu.removeGroup(Menu.CATEGORY_ALTERNATIVE); */ } return true; } @Override public boolean onContextItemSelected(MenuItem item) { // TODO Auto-generated method stub AdapterView.AdapterContextMenuInfo info; try { info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo(); } catch (ClassCastException e) { return false; } switch (item.getItemId()) { case MENU_ITEM_DELETE: { try { // ��ʾ�����м�¼���ݻ�ȡ���� ListView select_view = (ListView) info.targetView.getParent(); note_name = select_view.getItemAtPosition(info.position) .toString(); } catch (ClassCastException e) { return false; } // info.idΪ�����м�¼id note_array.remove((int) info.id); ListAdapter adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, note_array); setListAdapter(adapter); return true; } } return super.onContextItemSelected(item); } @Override protected void onListItemClick(ListView l, View v, int position, long id) { String action = getIntent().getAction(); if (Intent.ACTION_PICK.equals(action) || Intent.ACTION_GET_CONTENT.equals(action)) { // The caller is waiting for us to return a note selected by // the user. The have clicked on one, so return it now. //�м�¼���ݻ�ȡ��ʾ note_name = getListView().getItemAtPosition(position).toString(); } else { // Launch activity to view/edit the currently selected item String ls_note; Intent intent_add = new Intent(hellomenu.this, note_edit.class); ls_note = getListAdapter().getItem(position).toString(); intent_add.putExtra("note", ls_note); startActivityForResult(intent_add, 100); } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub if (resultCode == 100) { String ls_note, ls_no[]; Bundle b = data.getExtras(); ls_note = b.getString("note"); ls_no = b.getStringArray("note"); note_array.add(ls_note); ListAdapter adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, note_array); setListAdapter(adapter); } super.onActivityResult(requestCode, resultCode, data); } }