我在这里碰到了一堵巨大的墙。我得到了这个代码来检查数据库结果:
chosenSlotDAO.open();
Log.d("id", chosenSlotDAO.getId());
Log.d("isParked", chosenSlotDAO.getIsParked());
Log.d("parkedRow", chosenSlotDAO.getParkedRow());
Log.d("selectedSlot", chosenSlotDAO.getSelectedSlot());
String idStatus = chosenSlotDAO.getId();
String isParkedStatus = chosenSlotDAO.getIsParked();
String parkedRowStatus = chosenSlotDAO.getParkedRow();
String selectedSlotStatus = chosenSlotDAO.getSelectedSlot();
final String outputA = this.getOutput(this, slotA);
if(idStatus == id && isParkedStatus == isParked && parkedRowStatus != parkedA && selectedSlotStatus != slotA)
{
arriveTView.setText(alreadyParked + chosenSlotDAO.getParkedRow());
}
else if(idStatus == id && isParkedStatus == isNotParked && parkedRowStatus != parkedA && selectedSlotStatus != slotA)
{
Toast.makeText(getApplicationContext(),
wrongParkingRow,
Toast.LENGTH_LONG).show();
chosenSlotDAO.updateSlot(id, slotA, parkedA, isParked);
}
else if(idStatus == id && isParkedStatus == isParked && parkedRowStatus == parkedA && selectedSlotStatus == slotA)
{
chosenSlotDAO.updateSlot(id, slotA, setEmpty, isNotParked);
dbUpdateAdd.execute(slotA);
Intent myIntent = new Intent(ParkAArrive.this, ParkLeaving.class);
ParkAArrive.this.startActivity(myIntent);
}
else if(outputA.isEmpty())
{
arriveTView.setText(isFull);
}
else
{
Toast.makeText(getApplicationContext(),
nowParked,
Toast.LENGTH_LONG).show();
chosenSlotDAO.updateSlot(id, slotA, parkedA, isParked);
arriveTView.setText(chosenSlotDAO.getSelectedSlot());
dbUpdate.execute(slotA);
}
该类通过点击 NFC 标签开始。
日志猫返回
:06-15 04:35:10.818: D/id(12294): 1
06-15 04:35:10.818: D/isParked(12294): 1
06-15 04:35:10.819: D/parkedRow(12294): ParkedA
06-15 04:35:10.819: D/selectedSlot(12294): SlotA
06-15 04:35:10.829: D/link(12294): http://parkit.byethost9.com/db_show_slot.php?slot_name=SlotA
06-15 04:35:11.681: D/line(12294): 14
它清楚地显示用户已停放,ParkedRow 是 ParkedA,SlotA 是 SlotA。但是if
不起作用。
但是当我再次开始活动时,除了
else if(outputA.isEmpty())
{
arriveTView.setText(isFull);
}
else
{
Toast.makeText(getApplicationContext(),
nowParked,
Toast.LENGTH_LONG).show();
chosenSlotDAO.updateSlot(id, slotA, parkedA, isParked);
arriveTView.setText(chosenSlotDAO.getSelectedSlot());
dbUpdate.execute(slotA);
}
工程。
我在代码中的哪里做错了??告诉我我是否留下了任何未告知的所需信息。
更新:似乎我需要更改我的代码,以便它可以比较String
,是的,这是我面临的问题。
您应该使用 equals
方法来比较String
对象而不是the == operator
。
有关完整说明,请参阅以下问题:如何在 Java 中比较字符串?