我的條目看起來像這樣：在輸入數(shù)據(jù)之前，必須使用條碼掃描儀填寫條碼。當 Firestore 中存在條形碼時，我希望增加產(chǎn)品數(shù)量。當條形碼在Firestore中不可用時，Intent到另一個類。代碼 ：@Overridepublic void handleResult(Result result) { final String scanResult = result.getText(); ToneGenerator toneNotification = new ToneGenerator(AudioManager.STREAM_NOTIFICATION, 100); toneNotification.startTone(ToneGenerator.TONE_PROP_BEEP, 150); collectionReference.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() { @Override public void onComplete(@NonNull Task<QuerySnapshot> task) { if (task.isSuccessful()) { for (QueryDocumentSnapshot queryDocumentSnapshot : task.getResult()) { // if barcode is existing, then product quantity to increment if (queryDocumentSnapshot.getString("barCode") != null) { collectionReference.document(queryDocumentSnapshot.getId()).update("productQuantity", FieldValue.increment(1)); Intent moveView = new Intent(ScannersActivity.this, ViewData.class); moveView.putExtra("documentID", documentID); startActivity(moveView); finish(); } else { // If barcode is not available in firestore, then intent to another class Intent moveCode = new Intent(ScannersActivity.this, AddItems.class); moveCode.putExtra("sendDocumentID", documentID); moveCode.putExtra("ScanResult", scanResult); startActivity(moveCode); finish(); } } } } });}
2 回答
大話西游666
TA貢獻1817條經(jīng)驗 獲得超14個贊
productQuantity要根據(jù)財產(chǎn)的存在增加財產(chǎn)的價值barCode，請嘗試以下代碼行：
collectionReference.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
for (QueryDocumentSnapshot document : task.getResult()) {
if (document.getString("barCode") != null) {
collectionReference.document(document.getId()).update(
"productQuantity", FieldValue.increment(1)
);
}
}
}
}
});
ITMISS
TA貢獻1871條經(jīng)驗 獲得超8個贊
這將確定條形碼是否存在。您可以填寫交易TODO注釋來更新數(shù)量值。
public void handleResult(Result result) {
? String scanResult = result.getText();
? // ...
? collectionReference
? ? .whereEqualTo("barCode", scanResult)
? ? .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
? ? ? @Override
? ? ? public void onComplete(@NonNull Task<QuerySnapshot> task) {
? ? ? ? if (task.isSuccessful() && task.getResult().size() > 0) {
? ? ? ? ? // TODO barcode exists; increase qty
? ? ? ? }
? ? ? ? else {
? ? ? ? ? // barcode not found, new Intent
? ? ? ? }
? ? ? }
? ? });
}
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