解析objectID在Android中返回null

Question

private String clockInId;
public void clockIn(View v) {
    SimpleDateFormat sdfTime = new SimpleDateFormat("hh:mm:ss a", Locale.US);
    final String clockInTime = sdfTime.format(new Date(System.currentTimeMillis()));
    final ParseObject clockIn = new ParseObject("clockIn");
    clockIn.put("Time", clockInTime);
    clockIn.saveEventually(new SaveCallback() {
        @Override
        public void done(ParseException e) {
            clockInId = clockIn.getObjectId();  //Save objectID that was just created
        }
    });
    Toast toast = Toast.makeText(MainActivity.this, "Clocked In!",Toast.LENGTH_LONG);
    toast.show();
    Log.d(TAG, "objId:" + clockInId);
}

getObjectId()一直返回null，我错过了什么？解析对象保存得很好。

Answer 1

我将saveEventually更改为saveInBackground：

clockIn.saveInBackground(new SaveCallback() {
    @Override
    public void done(ParseException e) {
        clockInId = clockIn.getObjectId();  //Save objectID that was just created
        Log.d(TAG, "objId:" + clockInId);
    }