I am trying http connection over android

Question

I am a newbie on android development and i am having this error message while testing to send an sms over http connection and get a return string. below is the http api:

http://server:port/CreditCheck/checkcredits?username=xxxxx&password=xxxx

I get java.io.ioexception, i dont know how to track further and it is really giving me headache.

public class Sender {
    // Username that is to be used for submission
    String username;
    // password that is to be used along with username
    String password;
    // Message content that is to be transmitted
    String message;
    /**
    * What type of the message that is to be sent
    * <ul>
    * <li>0:means plain text</li>
    * <li>1:means flash</li>
    * <li>2:means Unicode (Message content should be in Hex)</li>
    * <li>6:means Unicode Flash (Message content should be in Hex)</li>
    * </ul>
    */
    String type;
    /**
    * Require DLR or not
    * <ul>
    * <li>0:means DLR is not Required</li>
    * <li>1:means DLR is Required</li>
    * </ul>
    */
    String dlr;
    /**
    * Destinations to which message is to be sent For submitting more than one
    * destination at once destinations should be comma separated Like
    * 91999000123,91999000124
    */
    String destination;
    // Sender Id to be used for submitting the message
    String source;
    // To what server you need to connect to for submission
    String server;
    // Port that is to be used like 8080 or 8000
    int port;
    // urlParts is the excessive part of the URL
    //String urlParts;

    public Sender(String server, int port, String username, String password, 
            String message, String dlr, String type, String destination, String source) {

        this.username = username;
        this.password = password;
        this.message = message;
        this.dlr = dlr;
        this.type = type;
        this.destination = destination;
        this.source = source;
        this.server = server;
        this.port = port;

    }


    public String checkBalance() {
        try {

            // Url that will be called to submit the message
            URL sendUrl = new URL("http://" + this.server + ":" + this.port
            + "/CreditCheck/checkcredits");
            HttpURLConnection httpConnection = (HttpURLConnection) sendUrl
            .openConnection();
            // This method sets the method type to POST so that
            // will be send as a POST request
            httpConnection.setRequestMethod("POST");
            // This method is set as true wince we intend to send
            // input to the server
            httpConnection.setDoInput(true);
            // This method implies that we intend to receive data from server.
            httpConnection.setDoOutput(true);
            // Implies do not use cached data
            httpConnection.setUseCaches(false);

            // Data that will be sent over the stream to the server.
            DataOutputStream dataStreamToServer = new DataOutputStream(
            httpConnection.getOutputStream());
            dataStreamToServer.writeBytes("username="
            + URLEncoder.encode(this.username, "UTF-8") + "&password="
            + URLEncoder.encode(this.password, "UTF-8"));

            dataStreamToServer.flush();
            dataStreamToServer.close();
            // Here take the output value of the server.
            BufferedReader dataStreamFromUrl = new BufferedReader(new InputStreamReader(httpConnection.getInputStream()));
            String dataFromUrl = "", dataBuffer = "";
            // Writing information from the stream to the buffer
            while ((dataBuffer = dataStreamFromUrl.readLine()) != null) {
                dataFromUrl += dataBuffer;
            }
            /**
            * Now dataFromUrl variable contains the Response received from the
            * server so we can parse the response and process it accordingly.
            */
            dataStreamFromUrl.close();
            //System.out.println("Response: " + dataFromUrl);
            return dataFromUrl;
        } catch (IOException ex) {

            ex.printStackTrace();
            return ex.toString();
        }catch(Exception ex){
            ex.printStackTrace();
            return ex.toString();
        }
    }

    public String submitMessage() {
        try {
            // Url that will be called to submit the message
            URL sendUrl = new URL("http://" + this.server + ":" + this.port + "/bulksms/bulksms");
            HttpURLConnection httpConnection = (HttpURLConnection) sendUrl.openConnection();

            // This method sets the method type to POST so that
            // will be send as a POST request
            httpConnection.setRequestMethod("GET");
            // This method is set as true wince we intend to send
            // input to the server
            httpConnection.setDoInput(true);
            // This method implies that we intend to receive data from server.
            httpConnection.setDoOutput(true);
            // Implies do not use cached data
            httpConnection.setUseCaches(false);

            // Data that will be sent over the stream to the server.
            DataOutputStream dataStreamToServer = new DataOutputStream(httpConnection.getOutputStream());
            dataStreamToServer.writeBytes("username="
            + URLEncoder.encode(this.username, "UTF-8") + "&password="
            + URLEncoder.encode(this.password, "UTF-8") + "&type="
            + URLEncoder.encode(this.type, "UTF-8") + "&dlr="
            + URLEncoder.encode(this.dlr, "UTF-8") + "&destination="
            + URLEncoder.encode(this.destination, "UTF-8") + "&source="
            + URLEncoder.encode(this.source, "UTF-8") + "&message="
            + URLEncoder.encode(this.message, "UTF-8"));

            dataStreamToServer.flush();
            dataStreamToServer.close();

            // Here take the output value of the server.
            BufferedReader dataStreamFromUrl = new BufferedReader(new InputStreamReader(httpConnection.getInputStream()));
            String dataFromUrl = "";
            String dataBuffer = "";

            // Writing information from the stream to the buffer
            while ((dataBuffer = dataStreamFromUrl.readLine()) != null) {
                dataFromUrl += dataBuffer;
            }
            /**
            * Now dataFromUrl variable contains the Response received from the
            * server so we can parse the response and process it accordingly.
            */
            dataStreamFromUrl.close();
            //System.out.println("Response: " + dataFromUrl);
            return dataFromUrl;

        } catch (IOException ex) {
            //ex.printStackTrace();
            return ex.toString();
        }catch(Exception ex){
            return ex.toString();
        }
    }

Below is my calling script for the button onClicklistener

public void onClick(View v) {
        Sender s = new Sender("server", port, "username", "password", "test for unicode", "1", "0", "23481111111", "Update");
        switch(v.getId()){
            case R.id.btnSaveSettings:
                Toast.makeText(getActivity(), s.submitMessage().toString(), Toast.LENGTH_SHORT).show();
                break;
            case R.id.btnBalance:
                Toast.makeText(getActivity(), s.checkBalance().toString(), Toast.LENGTH_SHORT).show();

                break;
            default:
                Toast.makeText(getActivity(), "No button Captured", Toast.LENGTH_SHORT).show();

        }
}

Please help me out on what I am doing wrong!

@Angad I have edited the code and below is what it looks like and the error i am getting.

My Calling method

public String checkBalance() {
    try {
        HttpClient client=new DefaultHttpClient();

        HttpPost request=new HttpPost("http://" + this.server + ":" + this.port + "/CreditCheck/checkcredits");

        BasicNameValuePair username=new BasicNameValuePair("username", this.username);
        BasicNameValuePair password=new BasicNameValuePair("password", this.password);

        List<NameValuePair> list=new ArrayList<NameValuePair>();
        list.add(username);
        list.add(password);

        UrlEncodedFormEntity urlentity=new UrlEncodedFormEntity(list);
        request.setEntity(urlentity);

        HttpResponse response=client.execute(request);

        HttpEntity entity=response.getEntity();
        String tmp=EntityUtils.toString(entity);
        return tmp;

    }catch(Exception ex){
        ex.printStackTrace();
        return ex.toString();
    }
}

My Onclick action implementing method checkBalance()

public void onClick(View v) {
    Sender s = new Sender("111.211.211.111", 8080, "user",
            "pass", "test for unicode", "1", "0", "234811111111", "Update");
    // TODO Auto-generated method stub
    switch(v.getId()){
        case R.id.btnSaveSettings:
            //this.savePreferences();
            Toast.makeText(getActivity(), s.submitMessage().toString(), Toast.LENGTH_SHORT).show();
            break;
        case R.id.btnBalance:

            Toast.makeText(getActivity(), s.checkBalance().toString(), Toast.LENGTH_SHORT).show();

            break;
        default:
            Toast.makeText(getActivity(), "No button Captured", Toast.LENGTH_SHORT).show();

    }

My Manifest file

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapp"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="19" />
    <uses-permission android:name="android.permission.READ_CONTACTS" />
    <uses-permission android:name="android.permission.INTERNET" />
<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".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>

Exception error Android.os.NetworkOnMainThreadException

Error message logcat including StackTrace()

10-19 14:22:20.285: E/SoundPool(1273): error loading /system/media/audio/ui/Effect_Tick.ogg 10-19 14:22:20.285: W/AudioService(1273): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg 10-19 14:22:20.285: E/SoundPool(1273): error loading /system/media/audio/ui/Effect_Tick.ogg 10-19 14:22:20.285: W/AudioService(1273): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg 10-19 14:22:20.285: E/SoundPool(1273): error loading /system/media/audio/ui/Effect_Tick.ogg 10-19 14:22:20.285: W/AudioService(1273): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg 10-19 14:22:20.285: E/SoundPool(1273): error loading /system/media/audio/ui/Effect_Tick.ogg 10-19 14:22:20.285: W/AudioService(1273): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg 10-19 14:22:20.295: E/SoundPool(1273): error loading /system/media/audio/ui/Effect_Tick.ogg 10-19 14:22:20.295: W/AudioService(1273): Soundpool could not load file: /system/media/audio/ui/Effect_Tick.ogg 10-19 14:22:20.305: E/SoundPool(1273): error loading /system/media/audio/ui/KeypressStandard.ogg 10-19 14:22:20.305: W/AudioService(1273): Soundpool could not load file: /system/media/audio/ui/KeypressStandard.ogg 10-19 14:22:20.305: E/SoundPool(1273): error loading /system/media/audio/ui/KeypressSpacebar.ogg 10-19 14:22:20.315: W/AudioService(1273): Soundpool could not load file: /system/media/audio/ui/KeypressSpacebar.ogg 10-19 14:22:20.315: E/SoundPool(1273): error loading /system/media/audio/ui/KeypressDelete.ogg 10-19 14:22:20.315: W/AudioService(1273): Soundpool could not load file: /system/media/audio/ui/KeypressDelete.ogg 10-19 14:22:20.325: W/System.err(1854): android.os.NetworkOnMainThreadException 10-19 14:22:20.325: E/SoundPool(1273): error loading /system/media/audio/ui/KeypressReturn.ogg 10-19 14:22:20.325: W/AudioService(1273): Soundpool could not load file: /system/media/audio/ui/KeypressReturn.ogg 10-19 14:22:20.325: E/SoundPool(1273): error loading /system/media/audio/ui/KeypressInvalid.ogg 10-19 14:22:20.325: W/AudioService(1273): Soundpool could not load file: /system/media/audio/ui/KeypressInvalid.ogg 10-19 14:22:20.335: W/AudioService(1273): onLoadSoundEffects(), Error -1 while loading samples 10-19 14:22:20.335: W/System.err(1854): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145) 10-19 14:22:20.335: W/System.err(1854): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84) 10-19 14:22:20.335: W/System.err(1854): at libcore.io.IoBridge.connectErrno(IoBridge.java:127) 10-19 14:22:20.335: W/System.err(1854): at libcore.io.IoBridge.connect(IoBridge.java:112) 10-19 14:22:20.345: W/System.err(1854): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192) 10-19 14:22:20.345: W/System.err(1854): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459) 10-19 14:22:20.345: W/System.err(1854): at java.net.Socket.connect(Socket.java:843) 10-19 14:22:20.345: W/System.err(1854): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119) 10-19 14:22:20.345: W/System.err(1854): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144) 10-19 14:22:20.355: W/System.err(1854): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 10-19 14:22:20.355: W/System.err(1854): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 10-19 14:22:20.355: W/System.err(1854): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 10-19 14:22:20.355: W/System.err(1854): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 10-19 14:22:20.365: W/System.err(1854): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 10-19 14:22:20.365: W/System.err(1854): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 10-19 14:22:20.375: W/System.err(1854): at com.example.sleeksmsmobile.Sender.checkBalance(Sender.java:96) 10-19 14:22:20.375: W/System.err(1854): at com.example.sleeksmsmobile.SettingsTab.onClick(SettingsTab.java:86) 10-19 14:22:20.375: W/System.err(1854): at android.view.View.performClick(View.java:4438) 10-19 14:22:20.385: W/System.err(1854): at android.view.View$PerformClick.run(View.java:18422) 10-19 14:22:20.385: W/System.err(1854): at android.os.Handler.handleCallback(Handler.java:733) 10-19 14:22:20.385: W/System.err(1854): at android.os.Handler.dispatchMessage(Handler.java:95) 10-19 14:22:20.385: W/System.err(1854): at android.os.Looper.loop(Looper.java:136) 10-19 14:22:20.395: W/System.err(1854): at android.app.ActivityThread.main(ActivityThread.java:5017) 10-19 14:22:20.395: W/System.err(1854): at java.lang.reflect.Method.invokeNative(Native Method) 10-19 14:22:20.395: W/System.err(1854): at java.lang.reflect.Method.invoke(Method.java:515) 10-19 14:22:20.405: W/System.err(1854): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 10-19 14:22:20.405: W/System.err(1854): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 10-19 14:22:20.415: W/System.err(1854): at dalvik.system.NativeStart.main(Native Method) 10-19 14:22:20.925: I/Choreographer(1273): Skipped 36 frames! The application may be doing too much work on its main thread.

Answer 1

In Android, you have to run network operations on a separate thread from the user interface. Otherwise, the act of sending the HTTP request causes the interface to freeze.

Android documentation

Answer 2

Your code has a contradiction between the comment and the actual coding:

        // This method sets the method type to POST so that
        // will be send as a POST request
        httpConnection.setRequestMethod("GET");

and then continues with setting both setDoInput and setDoOutput to true:

        // This method is set as true wince we intend to send
        // input to the server
        httpConnection.setDoInput(true);
        // This method implies that we intend to receive data from server.
        httpConnection.setDoOutput(true);

The setDoOutput(true) implicitly set the request method to POST because that's the default method whenever you want to send a request body. (see HttpURLConnection sends a POST request even though httpCon.setRequestMethod("GET"); is set). This might cause an error.

For further research please indicate the error location (source line).

Answer 3

I am glad to inform every one who showed concern to my problem that it has been fixed.

My code works fine and the Angad Tiwari's works and much simpler.

After i was able to get internet on my avd then i could use the printStackTrace() error report to find cause which was the Strict mode policy

the fix was for me to put this code below in the mainActivity class;

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);

I appreciate you all.....:)

Answer 4

rather using httpconnection i would suggest you to use httpclient like

          try
            {
                HttpClient client=new DefaultHttpClient();
                HttpPost request=new HttpPost("your url");

                BasicNameValuePair email=new BasicNameValuePair("username", "your username");
                BasicNameValuePair password=new BasicNameValuePair("password", "your password");

                List<NameValuePair> list=new ArrayList<NameValuePair>();
                list.add(username);
                list.add(password);

                UrlEncodedFormEntity urlentity=new UrlEncodedFormEntity(list);
                request.setEntity(urlentity);

                HttpResponse response=client.execute(request);

                HttpEntity entity=response.getEntity();
                String tmp=EntityUtils.toString(entity);
                return tmp;
            }
            catch(Exception e)
            {
                return e.toString();
            }

try yourcode with this...and tell me ...i'll surelly work...and its also quite simple...there its all meshup with stream and all.. hope this will help... ;-)