Question

我使用的是Android开发人员指南（rfid-sdk-for-android-dg-zh.pdf）中提供的快速入门示例，尽管它确实可以工作并扫描RFID标签，但可靠性似乎存在问题扫描。我将问题归结为EventHandler类，即使RFID标签位于扫描仪旁边，reader.Actions.getReadTags方法有时也会返回null。

任何帮助将不胜感激

我已经包含了我正在使用的代码：

package uk.co.assettrac.rfd2000_tc20_example;

import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;

import com.zebra.rfid.api3.*;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    private static Readers readers;
    private static ArrayList<ReaderDevice> availableRFIDReaderList;
    private static ReaderDevice readerDevice;
    private static RFIDReader reader;
    private static String TAG = "DEMO";
    TextView textView;
    private EventHandler eventHandler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
// UI
        textView = (TextView) findViewById(R.id.TagText);
// SDK
        if (readers == null) {
            readers = new Readers(this, ENUM_TRANSPORT.SERVICE_SERIAL);
        }
        new AsyncTask<Void, Void, Boolean>() {
            @Override
            protected Boolean doInBackground(Void... voids) {
                try {
                    if (readers != null) {
                        if (readers.GetAvailableRFIDReaderList() != null) {
                            availableRFIDReaderList =
                                    readers.GetAvailableRFIDReaderList();
                            if (availableRFIDReaderList.size() != 0) {
// get first reader from list
                                readerDevice = availableRFIDReaderList.get(0);
                                reader = readerDevice.getRFIDReader();
                                if (!reader.isConnected()) {
// Establish connection to the RFID Reader
                                    reader.connect();
                                    ConfigureReader();
                                    return true;
                                }
                            }
                        }
                    }
                } catch (InvalidUsageException e) {
                    e.printStackTrace();
                } catch (OperationFailureException e) {
                    e.printStackTrace();
                    Log.d(TAG, "OperationFailureException " + e.getVendorMessage());
                }
                return false;
            }
            @Override
            protected void onPostExecute(Boolean aBoolean) {
                super.onPostExecute(aBoolean);
                if (aBoolean) {
                    Toast.makeText(getApplicationContext(), "Reader Connected",
                            Toast.LENGTH_LONG).show();
//textView.setText("Reader connected");
                }
            }
        }.execute();
    }

    private void ConfigureReader() {
        if (reader.isConnected()) {
            TriggerInfo triggerInfo = new TriggerInfo();
            triggerInfo.StartTrigger.setTriggerType(START_TRIGGER_TYPE.START_TRIGGER_TYPE_IMMEDIATE);
            triggerInfo.StopTrigger.setTriggerType(STOP_TRIGGER_TYPE.STOP_TRIGGER_TYPE_IMMEDIATE);
            try {
// receive events from reader
                if (eventHandler == null)
                    eventHandler = new EventHandler();
                reader.Events.addEventsListener(eventHandler);
// HH event
                reader.Events.setHandheldEvent(true);
// tag event with tag data
                reader.Events.setTagReadEvent(true);
                reader.Events.setAttachTagDataWithReadEvent(true);
// set trigger mode as rfid so scanner beam will not come
                reader.Config.setTriggerMode(ENUM_TRIGGER_MODE.RFID_MODE, true);
// set start and stop triggers
                reader.Config.setStartTrigger(triggerInfo.StartTrigger);
                reader.Config.setStopTrigger(triggerInfo.StopTrigger);
            } catch (InvalidUsageException e) {
                e.printStackTrace();
            } catch (OperationFailureException e) {
                e.printStackTrace();
            }
        }
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
        try {
            if (reader != null) {
                reader.Events.removeEventsListener(eventHandler);
                reader.disconnect();
                Toast.makeText(getApplicationContext(), "Disconnecting reader",
                        Toast.LENGTH_LONG).show();
                reader = null;
                readers.Dispose();
                readers = null;
            }
        } catch (InvalidUsageException e) {
            e.printStackTrace();
        } catch (OperationFailureException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // Read/Status Notify handler
// Implement the RfidEventsLister class to receive event notifications
    public class EventHandler implements RfidEventsListener {
        // Read Event Notification
        public void eventReadNotify(RfidReadEvents e) {
// Recommended to use new method getReadTagsEx for better performance in case of large tag population
            TagData[] myTags = reader.Actions.getReadTags(100);
            if (myTags != null) {
                for (int index = 0; index < myTags.length; index++) {
                    Log.d(TAG, "Tag ID " + myTags[index].getTagID());
                    if (myTags[index].getOpCode() ==
                            ACCESS_OPERATION_CODE.ACCESS_OPERATION_READ &&
                            myTags[index].getOpStatus() ==
                                    ACCESS_OPERATION_STATUS.ACCESS_SUCCESS) {
                        if (myTags[index].getMemoryBankData().length() > 0) {
                            Log.d(TAG, " Mem Bank Data " + myTags[index].getMemoryBankData());
                        }
                    }
                }
            } else {
                Log.d(TAG, "TagData Array Null");
            }
        }
        // Status Event Notification
        public void eventStatusNotify(RfidStatusEvents rfidStatusEvents) {
            Log.d(TAG, "Status Notification: " +
                    rfidStatusEvents.StatusEventData.getStatusEventType());
            if (rfidStatusEvents.StatusEventData.getStatusEventType() ==
                    STATUS_EVENT_TYPE.HANDHELD_TRIGGER_EVENT) {
                if
                        (rfidStatusEvents.StatusEventData.HandheldTriggerEventData.getHandheldEvent() ==
                        HANDHELD_TRIGGER_EVENT_TYPE.HANDHELD_TRIGGER_PRESSED) {
                    new AsyncTask<Void, Void, Void>() {
                        @Override
                        protected Void doInBackground(Void... voids) {
                            try {
                                reader.Actions.Inventory.perform();
                            } catch (InvalidUsageException e) {
                                e.printStackTrace();
                            } catch (OperationFailureException e) {
                                e.printStackTrace();
                            }
                            return null;
                        }
                    }.execute();
                }

                if (rfidStatusEvents.StatusEventData.HandheldTriggerEventData.getHandheldEvent() ==
                        HANDHELD_TRIGGER_EVENT_TYPE.HANDHELD_TRIGGER_RELEASED) {
                    new AsyncTask<Void, Void, Void>() {
                        @Override
                        protected Void doInBackground(Void... voids) {
                            try {
                                reader.Actions.Inventory.stop();
                            } catch (InvalidUsageException e) {
                                e.printStackTrace();
                            } catch (OperationFailureException e) {
                                e.printStackTrace();
                            }
                            return null;
                        }
                    }.execute();
                }
            }
        }
    }
}

Answer 1

长时间阅读文档后，我发现该行

reader.Events.setAttachTagDataWithReadEvent（true）;

是引起问题的原因。

斑马RFD2000 TC20 RFID SDK

1 个答案: