Java Android将数据从rawQuery获取到另一个表单

我想从光标到

EmployeeDetails

表单中获取

Id

，但没有结果。这是我的代码：

public class EmployeeList extends ListActivity {
    protected EditText searchText;
    protected SQLiteDatabase db;
    protected Cursor cursor;
    protected ListAdapter adapter;
/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        db = (new DatabaseHelper(this)).getWritableDatabase();
        searchText = (EditText) findViewById (R.id.searchText);
    }
    public void search(View view) {
// || is the concatenation operation in SQLite
        cursor = db.rawQuery("SELECT _id FROM employee WHERE firstName=?", 
            new String[]{searchText.getText().toString()});
        Intent intent = new Intent(this, EmployeeDetails.class);
        long id = cursor.getLong(cursor.getColumnIndex("_id"));
        intent.putExtra("EMPLOYEE_ID", id);
        startActivity(intent);
    }
}

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为了从游标对象获取记录值，您需要迭代它并从中检索数据

if(c.getCount()>0){ if (c.moveToFirst()){  c.getLong(0); }}

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其中c是光标对象。。。还要检查光标是否不为null…

如果firstName是字符串，请使用firstName，如“XYZ”