Get Id from database in a listview onclick

问题

I have this class, that gets the data from the database and shows in a listview.

Is there a way to get the Id from the database and toast it?

Now the toast is returning: android.database.sqlite.SQLiteCursor@4180c088

 public class AndroidSQLite extends Activity { 

 private SQLiteAdapter
 mySQLiteAdapter;

 @Override
 public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
     setContentView(R.layout.main);
     ListView listContent = (ListView)findViewById(R.id.contentlist);

     mySQLiteAdapter = new SQLiteAdapter(this);
     mySQLiteAdapter.openToRead();

     Cursor cursor = mySQLiteAdapter.queueAll();
     startManagingCursor(cursor);

     String[] from = new String[]{SQLiteAdapter.KEY_NOME,SQLiteAdapter.KEY_ID};
     int[] to = new int[]{R.id.text,R.id.id};

     SimpleCursorAdapter cursorAdapter =
      new SimpleCursorAdapter(this, R.layout.row, cursor, from, to);

     listContent.setAdapter(cursorAdapter);

     listContent.setOnItemClickListener(new OnItemClickListener() {
         public void onItemClick(AdapterView<?> parent, View view, int position,
                 long id) {
                //GET ID FROM DATABASE
                Toast.makeText(getBaseContext(), parent.getItemAtPosition(position).toString(), Toast.LENGTH_LONG).show();
                //THIS TOAST IS RETURNING "android.database.sqlite.SQLiteCursor@4180c088"
         }
     });

     mySQLiteAdapter.close();
 } }

回答1:

Simply use the id parameter of onItemClick():

Toast.makeText(getBaseContext(), id + "", Toast.LENGTH_LONG).show();

---

For future reference you are currently trying to use an entire Cursor as a String, you want to select a column like this:

Toast.makeText(getBaseContext(), parent.getItemAtPosition(position).getLong(0), Toast.LENGTH_LONG).show();

(For a SimpleCursorAdapter the first column is always the _id column, hence getLong(0).)

来源：https://stackoverflow.com/questions/13126481/get-id-from-database-in-a-listview-onclick