Question

场景：我正在从asp.net web服务下载文件到我的android应用程序。 Web Service返回一个字节数组。我可以将文件下载到特定位置。但是当我在Android中运行它时，它会给出消息：

“解析包时出现问题”

这是我的网络服务代码和Android代码：

网络服务代码：

    [WebMethod]
        public byte[] GetApkFile(string deviceID)
        {
                try
                {
                        string path = "D:\\Users\\CHAITANYA\\Documents";
                        string fileName = path + "\\sample.apk";
                        FileStream fileStream = File.OpenRead(fileName);
                        return ConvertStreamToByteBuffer(fileStream);
                }
                catch (Exception ex)
                {
                        throw ex;

            }

        }

        public byte[] ConvertStreamToByteBuffer(System.IO.Stream theStream)
        {
                int b1;
                System.IO.MemoryStream tempStream = new System.IO.MemoryStream();
                while ((b1 = theStream.ReadByte()) != -1)
                {
                        tempStream.WriteByte(((byte)b1));
            }
                    return tempStream.ToArray();
        }

Android代码：

    package com.example.dwnload;

    import java.io.BufferedOutputStream;
    import java.io.BufferedReader;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.FileReader;
    import java.io.IOException;

    import org.ksoap2.SoapEnvelope;
    import org.ksoap2.serialization.MarshalBase64;
    import org.ksoap2.serialization.SoapObject;
    import org.ksoap2.serialization.SoapSerializationEnvelope;
    import org.ksoap2.transport.HttpTransportSE;

    import android.app.Activity;
    import android.os.Bundle;
    import android.os.Environment;
    import android.telephony.TelephonyManager;
    import android.view.View;
    import android.widget.Button;
    import android.widget.TextView;

    public class FileDownloadActivity extends Activity 
    {
            /** Called when the activity is first created. */

        TextView tv;
        Button dwnload;

            @Override
            public void onCreate(Bundle savedInstanceState) 
            {
                    super.onCreate(savedInstanceState);
                    setContentView(R.layout.main);
                    dwnload=(Button)this.findViewById(R.id.button1);
                    tv=(TextView)this.findViewById(R.id.textView1);
                    dwnload.setOnClickListener(new View.OnClickListener()
                    {

                public void onClick(View arg0)
                {

                    TelephonyManager TelephonyMgr = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);
                            String deviceId = TelephonyMgr.getDeviceId(); 
                            String SOAP_ACTION = "http://tempuri.org/GetApkFile";       
                            String METHOD_NAME = "GetApkFile";
                            String NAMESPACE = "http://tempuri.org/";
                            final String URL = "http://10.0.2.2/Dashboard/Service.asmx";

                            SoapObject request = new SoapObject(NAMESPACE,METHOD_NAME);
                            SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
                            //new MarshalBase64().register(envelope); 
                            envelope.encodingStyle = SoapEnvelope.ENC;
                            request.addProperty("deviceID", deviceId);  
                            //tv.setText(deviceId.toString());
                            envelope.setOutputSoapObject(request);
                            envelope.dotNet = true;
                            envelope.setOutputSoapObject(request);
                            HttpTransportSE httpTransport = new HttpTransportSE(URL);
                            try 
                            {
                                httpTransport.call(SOAP_ACTION, envelope);
                                //SoapObject response = (SoapObject)envelope.getResponse();
                                Object response = envelope.getResponse();
                                byte[] b=response.toString().getBytes();
                                String s = new String(b);

                                try 
                                {
                                            String filePath = Environment.getExternalStorageDirectory()+ "/myappdir/" + "sample.apk" ;

                                                          File file = new File(filePath);
                                            file.getParentFile().mkdirs();
                                            file.createNewFile();

                                            BufferedOutputStream objectOut = new BufferedOutputStream(new FileOutputStream(file));
                                            objectOut.write(b);
                                            objectOut.close();

                                           }
                                catch (Exception e) 
                                {
                                            e.printStackTrace();
                                }



                        }   


                            catch (Exception exception) 
                            {
                                exception.toString();           
                            }
                }
            });
                } 



    }

Answer 1

你在android上有一条线

byte[] b=response.toString().getBytes();

应替换为

byte[] b=Base64.decode(response.toString());

因为soap envelop会将其编码为＆lt; base64Binary＆gt;
并且不要忘记import org.kobjects.base64.Base64;

刚刚找到关于.net部分的内容。您的文件读取方法无法正确传输文件... ReadByte的内容我使用Read并传递数组（作为参考），然后返回具有正确数据的数组：

[WebMethod]
public byte[] GetApk()
{
    string file = "file name goes here";
    FileStream stream = File.OpenRead(file);

    byte[] buffer = new byte[stream.Length];
    stream.Read(buffer, 0, (int)stream.Length);

    return buffer;
}

为我工作...现在我的应用程序可以自动更新;）我希望它对你也有用

Answer 2

我建议您按照一些调试步骤进行操作。

首先验证您的网络服务是否按预期工作您可以通过编写基于.net的客户端来执行此操作，该客户端将下载您的文件并将其写入磁盘。您可以进行二进制比较，看看您是否正在获取目标文件。

如果您确实按预期获得了该文件，那么您的Web服务正常运行。

现在将此文件与使用android下载的文件进行比较。

这可以帮助您隔离错误。

从.net Web服务下载安装.apk的问题

2 个答案: