[JAVA] Post back the coupon code you used to the specified endpoint

This is a method of notifying the results when it is necessary to post back to the endpoint of the measurement system including the information such as the coupon code used for measuring the results of the advertisement.

This time I used HttpURLConnection.

security config settings and manifest settings

If the postback destination URL to be set is https: // ~, this setting is not necessary. Android 9 (Pie) does not allow unencrypted communication, that is, communication to URLs starting with http: // is not possible by default.

• If the URL to be set starts with https: //, this step is not necessary.

security config settings

Create the following files in the app / xml directory.

network_security_config.xml

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <domain-config cleartextTrafficPermitted="true">
        <domain includeSubdomains="true">XXXX.net</domain>
    </domain-config>
</network-security-config>

Allows unencrypted communication (http: //) to the specified domain (cleartextTrafficPremitted true).

manifest settings

After that, in the attribute part of the application tag of Android Manifest

android:networkSecurityConfig="@xml/network_security_config

To add. (Example)

AndroidManifest.xml

<application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        android:networkSecurityConfig="@xml/network_security_config">

Postback

Execute the following method when an event etc. that you want to generate a postback occurs. User input values that may change for each event, such as coupon codes, are set to be received as arguments.

Activity.java

public void postBack(final String cp){
        new Thread(new Runnable() {
            @Override
            public void run() {
                try{
                    URL url = new URL("https:/XXXX.net?coupon="+cp);
                    HttpURLConnection con = (HttpURLConnection)url.openConnection();
                    String str = InputStreamToString(con.getInputStream());
                    Log.d("HTTP",str);
                }catch(Exception e){
                    System.out.println(e);
                }
            }
        }).start();
    }

    static String InputStreamToString(InputStream is) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();
        String line;
        while( (line=br.readLine()) != null ){
            sb.append(line);
        }
        br.close();
        return sb.toString();
    }

reference

HttpURLConnection (Java Platform SE 8)