My Web Service cannot connect to android api 30

Question

im new in android development, i have problem with my program. my android program get data from API HTTP client. if i set targetSdkVersion=23 my program work, but if i set targetSdkVersion=30 it doesnt work

here my androidManifest.xml, connection to API, and helper for API androidManifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.abb.akda_extra">
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>


        <application
        android:allowBackup="true"
        android:icon="@drawable/logo_akda_fix"
        android:debuggable="false"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.MyApplication"
        tools:ignore="HardcodedDebugMode">
        <uses-library android:name="org.Apache.http.legacy" android:required="false"/>
        <activity android:name=".cek_kepesertaan"></activity>
        <activity android:name=".aktivasi_kartu" />
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Connection to API

package com.abb.akda_extra;

public class konfigurasi {
    //Alamat tujuan API
    /*public static final String URL_ADD = "http://192.168.1.227/smsdevelopment/api/tambahPeserta.php";
    public static final String URL_GET = "http://192.168.1.227/smsdevelopment/api/cekPeserta.php?nopin=";
    public static final String URL_GET_KARTU = "http://192.168.1.227/smsdevelopment/api/cekKartu.php?nopin=";
    public static final String URL_GET_STATUS = "http://192.168.1.227/smsdevelopment/api/cekKepesertaan.php?noktp=";*/

    public static final String URL_ADD = "http://apisms.abb.co.id/tambahPeserta.php";
    public static final String URL_GET = "http://apisms.abb.co.id/cekPeserta.php?nopin=";
    public static final String URL_GET_KARTU = "http://apisms.abb.co.id/cekKartu.php?nopin=";
    public static final String URL_GET_STATUS = "http://apisms.abb.co.id/cekKepesertaan.php?noktp=";

    //Kunci untuk mengirim permintaan ke script php dan untuk POST Request
    public static final String KEY_PST_ID = "id";
    public static final String KEY_PST_NOPIN = "nopin";
    public static final String KEY_PST_NAMA = "nama";
    public static final String KEY_PST_TANGGAL = "tanggal";
    public static final String KEY_PST_ALAMAT = "alamat";
    public static final String KEY_PST_NOMORHP = "nomorhp";
    public static final String KEY_PST_NIK = "noktp";
    public static final String KEY_PST_NOREG = "noreg";
    public static final String KEY_PST_TGLREG = "tglregister";
    public static final String KEY_PST_TGLAKTIF = "tglaktif";
    public static final String KEY_PST_TGLEXPIRED = "tglexpired";


    //JSON TAGS untuk GET Request
    public static final String TAG_JSON_ARRAY = "result";
    public static final String TAG_ID = "id";
    public static final String TAG_NOREG = "noreg";
    public static final String TAG_NOPIN = "nopin";
    public static final String TAG_NAMA = "nama";
    public static final String TAG_TANGGAL_LAHIR = "tgllahir";
    public static final String TAG_ALAMAT = "alamat";
    public static final String TAG_NOMORHP = "nomorhp";
    public static final String TAG_NIK = "nonik";
    public static final String TAG_TANGGAL_REGISTER = "tglregister";
    public static final String TAG_TANGGAL_AKTIF="tglaktif";
    public static final String TAG_TANGGAL_EXPIRED="tglexpired";

    //Noreg dan Nopin untuk cek kepesertaan
    public static final String PST_NOPIN = "pst_nopin";
    public static final String PST_NOREG = "pst_noreg";
}

My Request Handler

package com.abb.akda_extra;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

import javax.net.ssl.HttpsURLConnection;

public class RequestHandler {
    public String sendPostRequest(String requestURL,HashMap<String,String> postDataParams){
        URL url;

        StringBuilder sb = new StringBuilder();
        try{
            url = new URL(requestURL);

            //Membuat Koneksi HttpURLConnection
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            //HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();

            //Konfigurasi koneksi
            conn.setReadTimeout(5000);
            conn.setConnectTimeout(5000);
            conn.setRequestMethod("POST");
            conn.setDoInput(true);
            conn.setDoOutput(true);

            //Membuat keluaran Stream
            OutputStream os = conn.getOutputStream();

            //Menulis parameter permintaan
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os,"UTF-8"));
            writer.write(getPostDataString(postDataParams));

            writer.flush();
            writer.close();
            os.close();
            int responseCode = conn.getResponseCode();

            if (responseCode == HttpsURLConnection.HTTP_OK)
            {
                BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                sb = new StringBuilder();
                String response;
                //Reading server response
                while ((response = br.readLine()) != null){
                    sb.append(response);
                }
            }
        }catch (Exception e){
            e.printStackTrace();
        }
        return sb.toString();
    }

    public String sendGetRequest(String requestURL){
        StringBuilder sb =new StringBuilder();
        try {
            URL url = new URL(requestURL);
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            //HttpsURLConnection con = (HttpsURLConnection) url.openConnection();

            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream()));

            String s;
            while((s=bufferedReader.readLine())!=null){
                sb.append(s+"\n");
            }
        }catch(Exception e){
        }
        return sb.toString();
    }

    public String sendGetRequestParam(String requestURL,String nopin,String noreg){
        StringBuilder sb =new StringBuilder();
        try {
            URL url = new URL(requestURL+nopin+"&noreg="+noreg);
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            //HttpsURLConnection con = (HttpsURLConnection) url.openConnection();

            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream()));

            String s;
            while((s=bufferedReader.readLine())!=null){
                sb.append(s+"\n");
            }
        }catch(Exception e){
            e.printStackTrace();
        }
        return sb.toString();
    }

    public String sendGetRequestKartu(String requestURL,String nopin){
        StringBuilder sb =new StringBuilder();
        try {
            URL url = new URL(requestURL+nopin);
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            //HttpsURLConnection con = (HttpsURLConnection) url.openConnection();

            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream()));

            String s;
            while((s=bufferedReader.readLine())!=null){
                sb.append(s+"\n");
            }
        }catch(Exception e){
            e.printStackTrace();
        }
        return sb.toString();
    }
    public String sendGetRequestStatus(String requestURL,String noktp){
        StringBuilder sb =new StringBuilder();
        try {
            URL url = new URL(requestURL+noktp);
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            //HttpsURLConnection con = (HttpsURLConnection) url.openConnection();

            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream()));

            String s;
            while((s=bufferedReader.readLine())!=null){
                sb.append(s+"\n");
            }
        }catch(Exception e){
            e.printStackTrace();
        }
        return sb.toString();
    }

    private String getPostDataString(HashMap<String, String> params) throws UnsupportedEncodingException {
        StringBuilder result = new StringBuilder();
        boolean first = true;
        for (Map.Entry<String, String> entry : params.entrySet()) {
            if (first)
                first = false;
            else
                result.append("&");

            result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
            result.append("=");
            result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
        }

        return result.toString();
    }
}

Maybe i missing something because the different of api android level

Answer 1

If you target android SDK above 28 and getting issue with Api calls then

Add this line to your manifest

android:usesCleartextTraffic="true"

eg

 <application
    android:name=".MyApplication"
    android:allowBackup="false"
    android:theme="@style/MyMaterialTheme"
    android:usesCleartextTraffic="true"