Bad File Number exception while writing to file in assets folder

Question

I'm pretty new in Android programming. My problem is to write any information to the file in assets folder. However, Eclipse throws an exception which I don't understand: Bad file number exception.. Here is my code:

package com.example.marport;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.SoapFault;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapPrimitive;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import org.xmlpull.v1.XmlPullParserException;

import com.example.marport.R;

import android.app.Activity;
import android.content.res.AssetFileDescriptor;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class Plakasorgulama extends Activity {

    final static String NAMESPACE = "http://webservice.marport.dcat.com/";
    final static String METHOD_NAME = "truckLicenceDate";
    final static String SOAP_ACTION = "http://webservice.marport.dcat.com/truckLicenceDate";
    final static String URL = "http://192.168.1.164:8070/test/services/MarportWebServicePort";

    private EditText plaka;
    private Button sorgu;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.plakasorgulama);

        plaka = (EditText) findViewById(R.id.etPlaka);
        sorgu = (Button) findViewById(R.id.bPlakaSorgulama);
        final SoapObject Request=new SoapObject(NAMESPACE,METHOD_NAME);

        sorgu.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                String plakainfo = plaka.getText().toString();
                SoapObject request = new SoapObject("licence", plakainfo); 
                SoapSerializationEnvelope soapEnvelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
                soapEnvelope.dotNet=false;
                soapEnvelope.setOutputSoapObject(Request);
                HttpTransportSE aht=new HttpTransportSE(URL);

                try {
                      AssetFileDescriptor descriptor = getAssets().openFd("htmlcode.txt");
                      BufferedWriter out = new BufferedWriter(new FileWriter(descriptor.getFileDescriptor()));
                      out.write("tryyyyyyyyyyyyyyyyyyyyyy");
                      out.close();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }

                try {
                    aht.call(SOAP_ACTION, soapEnvelope);
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (XmlPullParserException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                  try {
                    SoapPrimitive result=(SoapPrimitive) soapEnvelope.getResponse();
                } catch (SoapFault e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } 
            }
        });               
    }
}

Also I tried giving the direct path of assets folder. When I do that, this time FileNotFound exception comes.. This problem make me sick.

And these are logs:

08-27 07:38:36.749: W/System.err(740): java.io.IOException: Bad file number
08-27 07:38:36.770: W/System.err(740):  at org.apache.harmony.luni.platform.OSFileSystem.writeImpl(Native Method)
08-27 07:38:36.770: W/System.err(740):  at org.apache.harmony.luni.platform.OSFileSystem.write(OSFileSystem.java:129)
08-27 07:38:36.800: W/System.err(740):  at java.io.FileOutputStream.write(FileOutputStream.java:297)
08-27 07:38:36.800: W/System.err(740):  at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:175)
08-27 07:38:36.800: W/System.err(740):  at java.io.OutputStreamWriter.close(OutputStreamWriter.java:151)
08-27 07:38:36.800: W/System.err(740):  at java.io.BufferedWriter.close(BufferedWriter.java:130)
08-27 07:38:36.800: W/System.err(740):  at com.example.marport.Plakasorgulama$1.onClick(Plakasorgulama.java:61)
08-27 07:38:36.800: W/System.err(740):  at android.view.View.performClick(View.java:2408)
08-27 07:38:36.800: W/System.err(740):  at android.view.View$PerformClick.run(View.java:8816)
08-27 07:38:36.800: W/System.err(740):  at android.os.Handler.handleCallback(Handler.java:587)
08-27 07:38:36.800: W/System.err(740):  at android.os.Handler.dispatchMessage(Handler.java:92)
08-27 07:38:36.810: W/System.err(740):  at android.os.Looper.loop(Looper.java:123)
08-27 07:38:36.820: W/System.err(740):  at android.app.ActivityThread.main(ActivityThread.java:4627)
08-27 07:38:36.820: W/System.err(740):  at java.lang.reflect.Method.invokeNative(Native Method)
08-27 07:38:36.820: W/System.err(740):  at java.lang.reflect.Method.invoke(Method.java:521)
08-27 07:38:36.820: W/System.err(740):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-27 07:38:36.820: W/System.err(740):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-27 07:38:36.820: W/System.err(740):  at dalvik.system.NativeStart.main(Native Method)

Thank you very much.

Answer 1

Files in the Assets folder are available only in READ ONLY format, you can't write on them.