SendData不是抽象的，也不覆盖ReceivedDataListener中的抽象方法returnData(byte[]，字节)。

Question

我的一些代码有点问题，需要一些帮助！

在这一行代码中，我得到了以下错误：

public class SendData implements ReceivedDataListener {

错误是

错误：(16，8)错误: SendData不是抽象的，也不覆盖ReceivedDataListener中的抽象方法returnData(byte[]，字节)

我的ReceivedDataListener代码如下所示：

package com.commandsoftware.androidbookingapp.Services.Communications;

public interface ReceivedDataListener {
    void returnData(byte[] incomingData, byte commsIdentifier);
}

SendData看起来是这样的：

package com.commandsoftware.androidbookingapp.Services.Communications;

import android.app.Activity;
import android.app.Service;
import android.content.Context;

import com.commandsoftware.androidbookingapp.Services.Communications.ReceivedDataListener;

import java.io.UnsupportedEncodingException;
import java.util.ArrayList;

/**
 * Created by Anthony on 29/07/2014.
 */
public class SendData implements ReceivedDataListener {

    public static byte[] stringToData(String str, byte varID) {
        int strLength = str.length();
        byte[] varData = new byte[strLength];
        byte[] varHeader = new byte[]
                { varID, (byte) (strLength & 0xff) };
        try
        {
            varData = str.getBytes("ASCII");
        }
        catch (UnsupportedEncodingException e)
        {
            e.printStackTrace();
        }
        byte[] message = new byte[varHeader.length + varData.length];
        System.arraycopy(varHeader, 0, message, 0, varHeader.length);
        System.arraycopy(varData, 0, message, varHeader.length, varData.length);
        return message;
    }

    public static byte[] intToData(int number, byte varID, int varLength) {
        byte[] message = new byte[varLength + 2];
        message[0] = varID;
        message[1] = (byte) (varLength & 0xff);
        switch (varLength)
        {
            case ProcessData.ONE_BYTE:
                message[2] = (byte) (number & 0xff);
                break;
            case ProcessData.TWO_BYTES:
                message[2] = (byte) (number >> 8);
                message[3] = (byte) (number & 0xff);
                break;
            case ProcessData.FOUR_BYTES:
                message[2] = (byte) (number >> 24);
                message[3] = (byte) (number >> 16);
                message[4] = (byte) (number >> 8);
                message[5] = (byte) (number & 0xff);
                break;
        }
        return message;
    }

    public static byte[] calculateLength(byte[] message, int noVariables) {
        int packetLen = message.length;
        byte[] lengthBytes =
                { (byte) (packetLen >> 8), (byte) (packetLen & 0xff), (byte) (noVariables & 0xff) };
        return lengthBytes;
    }

    public static byte[] calculateChecksum(byte[] message) {
        int val = 0;
        for (int i = 0; i < message.length; i++)
        {
            val += (message[i] & 0xff);
        }
        int mod = val % 65536;
        byte[] checksumBytes =
                { (byte) (mod >> 8), (byte) (mod & 0xff) };
        return checksumBytes;
    }

    public static byte[] addHeaders(ArrayList<byte[]> array, byte headerByte) {
        // splitting back ArrayList into bytes
        int sum = 0;
        for (byte[] ba : array)
        {
            sum = sum + ba.length;
        }

        byte[] finalbuf = new byte[sum];
        int curpos = 0;
        for (byte[] ba : array)
        {
            System.arraycopy(ba, 0, finalbuf, curpos, ba.length);
            curpos = curpos + ba.length;
        }

        byte[] lengthBytes = calculateLength(finalbuf, array.size() - 1);
        byte[] messageWithLen = Comms.bytesAppend(lengthBytes, finalbuf);
        byte[] chkSumBytes = calculateChecksum(messageWithLen);
        byte[] messageWithCkSum = Comms.bytesAppend(chkSumBytes, messageWithLen);
        byte[] header =
                { (byte) 0xaa, (byte) 0xcc, (byte) 0x88, headerByte };
        byte[] finalMessage = Comms.bytesAppend(header, messageWithCkSum);

        StringBuilder sentBytes = new StringBuilder();
        for (byte cha : finalMessage)
        {
            StringBuilder sb = Comms.byteToText(cha);
            sentBytes.append(sb);
        }
        return finalMessage;
    }


    public void CalculateFare(int FromEasting, int FromNorthing, int ToEasting, int ToNorthing, Activity callingActivity, final Context ctx)
    {
        ArrayList<byte[]> fareByteArrays = new ArrayList<byte[]>();
        // from X
        byte[] data1 = intToData(FromEasting, (byte) 0x01, 4);
        fareByteArrays.add(data1);

        // from Y
        byte[] data2 = intToData(FromNorthing, (byte) 0x02, 4);
        fareByteArrays.add(data2);

        // to X
        byte[] data3 = intToData(ToEasting, (byte) 0x03, 4);
        fareByteArrays.add(data3);

        // to Y
        byte[] data4 = intToData(ToNorthing, (byte) 0x04, 4);
        fareByteArrays.add(data4);

        // vehicletype
        byte[] data5 = stringToData("0", (byte) 0x05);
        fareByteArrays.add(data5);

        // add ff
        byte[] data6 =
                { (byte) 0xff };
        fareByteArrays.add(data6);

        byte[] finalFareMessage = addHeaders(fareByteArrays, (byte) 0xf1);
        Comms conn = new Comms(finalFareMessage, callingActivity, ctx);
        conn.startLongRunningOperation();
    }
}

不太确定这是否相关，但这是我的android清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.commandsoftware.androidbookingapp" >

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".Activity.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

非常感谢你提前提供的帮助:)

Answer 1

您必须在您的void returnData(byte[] incomingData, byte commsIdentifier)类中为SendData提供一个实现，因为您正在实现该接口。

将以下内容添加到SendData类中

@Override
public void returnData(byte[] incomingData, byte commsIdentifier) {
    // Your implementation goes here
}