Question

我正在制作AlertDialog，该对话框用于将项目添加到我的收货清单中。在AlertDialog中，有一个按钮可以访问Zxing QR Scanner。我想要的是在系统获得QR扫描结果之后，将其返回给alertdialog。我已经在QR扫描活动中进行了编码以使该活动意图返回，但是问题是当其意图返回时，它不会自动再次打开“警报对话框”。

这是从QR活动获得结果的代码行，我应该在此处添加什么以自动打开警报对话框？

if (savedInstanceState == null) {
            Bundle extras = getIntent().getExtras();
            if (extras == null) {
                qrResult = null;
            } else {
                qrResult = extras.getString("QRItemtype");

            }

这就是我从QR扫描活动中导航回来的方式

Intent qrResult = new Intent(QRScannerActivity.this, CreateReceiptActivity.class);
                itemTypeQR = result.getContents();
                qrResult.putExtra("QRItemtype",itemTypeQR);
                startActivity(qrResult);

这是完整的代码：

public class CreateReceiptActivity extends AppCompatActivity {

    @BindView(R.id.receipt_date)
    TextView date;
    @BindView(R.id.receipt_invoice)
    TextView invoiceNumber;
    @BindView(R.id.btn_receipt_add_item)
    ImageButton addItem;
    @BindView(R.id.btn_receipt_print)
    ImageButton printItem;
    @BindView(R.id.receipt_view_recycler)
    RecyclerView recyclerView;
    @BindView(R.id.create_receipt_pb_loading)
    ProgressBar pbloading;

    List<ListAutoComplete> autoCompleteList;
    ListAutoComplete listAutoComplete;


    List<ListReceiptItem> receiptItemList;
    ListReceiptItem listReceiptItem;
    ReceiptItemAdapter adapter;
    public String itemType, itemQty, itemPrice, itemDate, itemInvoice, lastInvoice, qrResult;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_create_receipt);
        ButterKnife.bind(this);


        receiptItemList = new ArrayList<>();
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        adapter = new ReceiptItemAdapter(this, receiptItemList);
        recyclerView.setAdapter(adapter);
        itemInvoice = invoiceNumber.getText().toString();
        itemDate = setDate(date);
        date.setText(this.getString(R.string.date, setDate(date)));

        printItem.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        switch (which) {
                            case DialogInterface.BUTTON_POSITIVE:
                                pbloading.setVisibility(View.VISIBLE);
                                cutStock();
                                break;

                            case DialogInterface.BUTTON_NEGATIVE:
                                //No button clicked
                                break;
                        }
                    }
                };

                AlertDialog.Builder builder = new AlertDialog.Builder(CreateReceiptActivity.this);
                builder.setMessage("Print Transaksi ?").setPositiveButton("Ya", dialogClickListener)
                        .setNegativeButton("Tidak", dialogClickListener).show();

            }
        });



        if (savedInstanceState == null) {
            Bundle extras = getIntent().getExtras();
            if (extras == null) {
                qrResult = null;
            } else {
                qrResult = extras.getString("QRItemtype");

            }
        } else {
            qrResult = (String) savedInstanceState.getSerializable("QRItemtype");
        }
        addItem.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //    getTypeList();
                LayoutInflater li = CreateReceiptActivity.this.getLayoutInflater();

                final View v = li.inflate(R.layout.alertdialog_create_receipt, null);
                final AlertDialog.Builder builder = new AlertDialog.Builder(CreateReceiptActivity.this);
                builder.setView(v);
                final EditText addItemType = v.findViewById(R.id.alertdialog_receipt_type);
                final EditText addItemQty = v.findViewById(R.id.alertdialog_receipt_qty);
                final EditText addItemPrice = v.findViewById(R.id.alertdialog_receipt_price);
                Button btnSubmit = v.findViewById(R.id.alertdialog_receipt_submit);
                Button btnScan = v.findViewById(R.id.alertdialog_receipt_scanqr);
                if (qrResult == null){
                    Toast.makeText(CreateReceiptActivity.this, "Gagal scan. Masukkan Tipe Secara Manual", Toast.LENGTH_SHORT).show();
                }
                else {
                    addItemType.setText(qrResult);
                }
                btnScan.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Intent i = new Intent(CreateReceiptActivity.this, QRScannerActivity.class);
                        startActivity(i);

                    }
                });
                final AlertDialog alertDialog = builder.show();
                btnSubmit.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {

                        itemType = addItemType.getText().toString().trim();
                        itemQty = addItemQty.getText().toString().trim();
                        itemPrice = addItemPrice.getText().toString().trim();
                        listReceiptItem = new ListReceiptItem(itemType, itemQty, itemPrice, "0");
                        receiptItemList.add(listReceiptItem);
                        recyclerView.setAdapter(adapter);
                        adapter.notifyDataSetChanged();
                        alertDialog.dismiss();
                        Toast.makeText(CreateReceiptActivity.this, "barang tertambah", Toast.LENGTH_SHORT).show();
                    }
                });
            }
        });
    }

Answer 1

获取QR并返回结果后，您将无法启动新的CreateReceiptActivity实例：

在CreateReceiptActivity中：

private static final int QR_REQUEST_CODE = 1;

...

  btnScan.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
      Intent i = new Intent(CreateReceiptActivity.this, QRScannerActivity.class);
      startActivityForResult(i, QR_REQUEST_CODE);
    }
 });

在QRScannerActivity中：

Intent qrResult = new Intent();
itemTypeQR = result.getContents();
qrResult.putExtra("QRItemtype",itemTypeQR);
setResult(RESULT_OK, intent);
finish();

然后在CreateReceiptActivity中输入

：

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (data == null) {return;}
    qrResult = data.getString("QRItemtype");
    // do you want with scanned QR
  }

要防止对话框消失，请参阅https://stackoverflow.com/a/7636468/8430649

意向后自动打开AlertDialog

1 个答案: