Android SQLite數據庫

Question

我有應用程序使用SQLite數據庫（兩行的表）我需要接收選定列表項的_ID行，但不知道如何去做。因此，主要活動

public class Main extends ListActivity { 
private RecipesData recipes; 
private static int[] TO={0,R.id.row_text_id}; 
private static String[] FROM={ _ID, CATEGORY_NAME, }; 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    recipes=new RecipesData(this); 
    try{ 
     Cursor cursor=getCategories(); 
     showCategories(cursor); 
    }finally{ 
     recipes.close(); 
    } 
    final ListView lv=getListView(); 
    lv.setOnItemClickListener(new OnItemClickListener(){ 
     public void onItemClick(AdapterView<?> a, View v, int position, long id){ 
      AlertDialog.Builder adb=new AlertDialog.Builder(Main.this); 
        adb.setTitle("LVSelectedItemExample"); 
       adb.setMessage("Selected Item is = "+((TextView)v).getText()); 
        adb.setPositiveButton("Ok", null); 
        adb.show(); 
     } 
    }); 
} 
@Override 
protected void onPause(){ 
    recipes.close(); 
    super.onPause(); 
} 
@Override 
protected void onStop(){ 
    recipes.close(); 
    super.onStop(); 
} 
@Override 
public boolean onCreateOptionsMenu(Menu menu){ 
    super.onCreateOptionsMenu(menu); 
    MenuInflater inflater=getMenuInflater(); 
    inflater.inflate(R.menu.menu, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item){ 
    switch(item.getItemId()){ 
    case R.id.add_category_item: 
     return true; 
    } 
    return false; 
} 

private void showCategories(Cursor cursor){ 
    SimpleCursorAdapter adapter=new SimpleCursorAdapter(this,R.layout.item,cursor,FROM,TO); 
    setListAdapter(adapter); 
} 
private Cursor getCategories(){ 
    SQLiteDatabase db=recipes.getReadableDatabase(); 
    Cursor cursor=db.query(CATEGORY_TABLE, FROM, null, null, null, null, null); 
    startManagingCursor(cursor); 
    return cursor; 
}} 

Answer 1

在onItemClick

Cursor cursor = ((CursorAdapter) a.getAdapter()).getCursor(); 
String currentId = cursor.getString(0);