Android POST Request to PHP

Question

I try to develope an Android application. In this application, I need to send a POST request to a PHP page.

My code is at Java side:

 DefaultHttpClient httpclient = new DefaultHttpClient();
 HttpPost httppost = new HttpPost("http://localhost/get.php");

     ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
     nameValuePairs.add(new BasicNameValuePair("mail", "asdasd"));
     httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

     try{
            HttpResponse httpresponse = httpclient.execute(httppost);

     }catch(Exception e){
         Toast.makeText(getApplicationContext(), "Didn't Happen",10).show();    
     }

Manifest.xml

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

    <uses-sdk android:minSdkVersion="10" android:targetSdkVersion="17"/>
    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:permission="android.permission.INTERNET"
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.misman.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>

I have searched from a lot of websites and the code goes in catch block continuously.I also used HttpURLConnection and didn't work. Can you help me what can be the problem?

You should log the exception instead of just printing "Didn't happen" in the catch block. That will help you to debug the issue. — 1615903, Jun 18 '13 at 11:20

score 4 · Answer 1 · edited Jun 18 '13 at 11:43

Use the following code. It is working fine

public class HttpClient {
    private static final String TAG = "HttpClient";

    public static JSONObject SendHttpPost(String URL, JSONObject jsonObjSend) {

    try {
        DefaultHttpClient httpclient = new DefaultHttpClient();
        HttpPost httpPostRequest = new HttpPost(URL);

        StringEntity se;
        se = new StringEntity(jsonObjSend.toString());

        httpPostRequest.setEntity(se);
        httpPostRequest.setHeader("Accept", "application/json");
        httpPostRequest.setHeader("Content-type", "application/json");
        httpPostRequest.setHeader("Accept-Encoding", "gzip"); 

        long t = System.currentTimeMillis();
        HttpResponse response = (HttpResponse) httpclient.execute(httpPostRequest);
        Log.i(TAG, "HTTPResponse received in [" + (System.currentTimeMillis()-t) + "ms]");

        HttpEntity entity = response.getEntity();

        if (entity != null) {
            InputStream instream = entity.getContent();
            Header contentEncoding = response.getFirstHeader("Content-Encoding");
            if (contentEncoding != null && contentEncoding.getValue().equalsIgnoreCase("gzip")) {
                instream = new GZIPInputStream(instream);
            }

            String resultString= convertStreamToString(instream);
            instream.close();
            resultString = resultString.substring(0,resultString.length()-1); 

            JSONObject jsonObjRecv = new JSONObject(resultString);
            Log.i(TAG,"<JSONObject>\n"+jsonObjRecv.toString()+"\n</JSONObject>");

            return jsonObjRecv;
        } 

    }
    catch (Exception e)
    {
        Log.e("Exception", "Exception");
        e.printStackTrace();
    }
    return null;
}


private static String convertStreamToString(InputStream is) {
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    StringBuilder sb = new StringBuilder();

    String line = null;
    try {
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return sb.toString();
    }
}

score 0 · Accepted Answer · edited Mar 04 '17 at 22:47

My problem was that I want to run my code in application main thread and main thread doesn't allow that. There are a few ways to solve this problem,

Using AsyncTask to perform background operation
Run the code in a new thread

Enable network operation in MainActivity and this is what I choose for now by

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

UPDATE

Because of the name of the question I want to share how to make Http call in android in order to guide people. There are some apis:

And there is a training in

Android Developer

Android POST Request to PHP

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