moveToNext（）具有两个功能。它返回一个布尔值，这标志着有 是 下一个，但在同一时间它会开始移动光标。
public void loadTrack() {
sqliteDatabase db1 = waypoints.getWritableDatabase();
Cursor trackCursor = db1.query(TABLE_NAME, FROM, "trackidfk=1", null, null, null,ORDER_BY);
trackCursor.moveToFirst();
do {
Double lat = trackCursor.getDouble(2);
Double lon = trackCursor.getDouble(1);
//overlay.addGeoPoint( new GeoPoint( (int)(lat*1E6), (int)(lon*1E6)));
System.out.println(lon);
System.out.println(lat);
} while (trackCursor.moveToNext());
}
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