從數據庫獲取微調器數據時出錯

Question

Booking.java

package one.two;

import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.SimpleCursorAdapter;
import android.widget.Spinner;

public class Booking extends Activity
{
    private DBAdapter db; 
    private Spinner colourSpinner;
    private String txtArrival;
    /** Called when the activity is first created. */
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        db = new DBAdapter(this);
        db.open();
        setContentView(R.layout.booking);
        Cursor c = db.getSpinnerData();
        startManagingCursor(c);
        String[] from = new String[]{DBAdapter.KEY_ARRIVAL};
        int[] to = new int[]{R.id.txtArrival};
        SimpleCursorAdapter adapter =
        new SimpleCursorAdapter(this, android.R.layout.simple_spinner_item, c, from, to );
        adapter.setDropDownViewResource( android.R.layout.simple_spinner_dropdown_item );
        Spinner colourSpinner = (Spinner) findViewById(R.id.myspinner);
        colourSpinner.setAdapter(adapter);
        }

我將在哪里聲明我的{KEY_ARRIVAL}，因為我已經在DBAdapter.java中聲明了我的KEY_ARRIVAL。 但是出現錯誤，指出KEY_ARRIVAL無法解決？

Answer 1

您是說您在KEY_ARRIVAL定義了一個字符串KEY_ARRIVAL嗎？ 將其設為public static final ，您可以通過DBAdapter.KEY_ARRIVAL訪問它。