Question

我正在为RadioPad开发一个Android应用程序：可在Android上运行的条形码扫描仪，并且在接收条形码信息时遇到问题。

问题是某些类无法从程序包外部访问。

常量的另一个问题。

我正在使用的RadioPad在Zebra MC3200上正在Android 4.1及更高版本上工作。

我正在使用此库：barcode_scanner_library_v2.4.6.0

这是我正在处理的Main.java文件：

package com.example.zebrascanner;

import androidx.appcompat.app.AppCompatActivity;

import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.SyncStateContract.*;
import android.view.View;

import com.zebra.scannercontrol.*;

import java.util.ArrayList;


public class MainActivity extends AppCompatActivity implements IDcsSdkApiDelegate {


SDKHandler sdkHandler;

int scannerId;

ArrayList<DCSScannerInfo> mScannerInfoList = new ArrayList<>();


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);




    sdkHandler = new SDKHandler(this);
    sdkHandler.dcssdkSetDelegate(this);
    sdkHandler.dcssdkSetOperationalMode(DCSSDKDefs.DCSSDK_MODE.DCSSDK_OPMODE_SNAPI);

    int notifications_mask = 0;

    // We would like to subscribe to all scanner available/not-available events
    notifications_mask |=
            DCSSDKDefs.DCSSDK_EVENT.DCSSDK_EVENT_SCANNER_APPEARANCE.value |
                    DCSSDKDefs.DCSSDK_EVENT.DCSSDK_EVENT_SCANNER_DISAPPEARANCE.value;

    // We would like to subscribe to all scanner connection events
    notifications_mask |=
            DCSSDKDefs.DCSSDK_EVENT.DCSSDK_EVENT_SESSION_ESTABLISHMENT.value |
                    DCSSDKDefs.DCSSDK_EVENT.DCSSDK_EVENT_SESSION_TERMINATION.value;

    // We would like to subscribe to all barcode events
    notifications_mask |= DCSSDKDefs.DCSSDK_EVENT.DCSSDK_EVENT_BARCODE.value;

    // subscribe to events set in notification mask
    sdkHandler.dcssdkSubsribeForEvents(notifications_mask);


    // enable scanner detection
    sdkHandler.dcssdkEnableAvailableScannersDetection(true);


    //Synchronisation

    sdkHandler.dcssdkGetAvailableScannersList(mScannerInfoList);
    sdkHandler.dcssdkGetActiveScannersList(mScannerInfoList);

}




//CONNECTION TO SCANNER


public void connectToScanner(View view) {
    new MyAsyncTask(scannerId).execute();
}

private class MyAsyncTask extends AsyncTask<Void, Integer, Boolean> {
    private int scannerId;

    public MyAsyncTask(int scannerId) {
        this.scannerId = scannerId;
    }


    @Override
    protected Boolean doInBackground(Void... voids) {
        DCSSDKDefs.DCSSDK_RESULT result =
                DCSSDKDefs.DCSSDK_RESULT.DCSSDK_RESULT_FAILURE;
        if (sdkHandler != null) {
            result =
                    sdkHandler.dcssdkEstablishCommunicationSession(scannerId);
        }
        if (result == DCSSDKDefs.DCSSDK_RESULT.DCSSDK_RESULT_SUCCESS) {
            return true;
        } else if (result == DCSSDKDefs.DCSSDK_RESULT.DCSSDK_RESULT_FAILURE) {
            return false;
        }
        return false;
    }
}




//RECEPTION


public class BaseActivity extends AppCompatActivity implements IDcsSdkApiDelegate {

    @Override
    public void dcssdkEventBarcode(byte[] barcodeData, int barcodeType, int fromScannerID) {
        Barcode barcode = new Barcode(barcodeData,barcodeType,fromScannerID);
        dataHandler.obtainMessage(Constants.BARCODE_RECIEVED,barcode).sendToTarget();
    }

主要问题实际上在这里：

//接收

public class BaseActivity extends AppCompatActivity implements IDcsSdkApiDelegate {

    @Override
    public void dcssdkEventBarcode(byte[] barcodeData, int barcodeType, int fromScannerID) {
        Barcode barcode = new Barcode(barcodeData,barcodeType,fromScannerID);
        dataHandler.obtainMessage(Constants.BARCODE_RECIEVED,barcode).sendToTarget();
    }

我希望从包中导入import com.zebra.scannercontrol.Barcode，但错误是它不是公共的，无法从包外部访问。

无法从包外部访问类

0 个答案: