Android Studio HttpURLConnection

Question

Oi. Estou com um problema com a classe HttpUrlConnection no Android Studio:

O meu c&oacute;digo-fonte (dentro de protected String doInBackground(Void... voids) que est&aacute; dentro da classe DownloadJSON que estende AsyncTask(Void, Void, String):

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[FONT=Verdana][SIZE=3]String urlWebService = (string da URL aqui);

URL url = new URL(urlWebService);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
StringBuilder sb = New StringBuilder();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String json;
while ((json = bufferedReader.readLine()) != null) {
    sb.append(json + 
); 
}
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Erro no logcat:

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[FONT=Arial][SIZE=3][COLOR=#ff0000]/(nome do pacote) E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
    Process: (nome do pacote), PID: 2775
    java.lang.RuntimeException: An error occured while executing doInBackground()
        at android.os.AsyncTask$3.done(AsyncTask.java:300)
        at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
        at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
        at java.util.concurrent.FutureTask.run(FutureTask.java:242)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
        at java.lang.Thread.run(Thread.java:841)
     Caused by: java.lang.NullPointerException[/COLOR]
[COLOR=#ff0000]        at (nome do pacote).TelaPrincipal$1DownloadJSON.doInBackground(TelaPrincipal.java:492) [/COLOR][COLOR=#808080](linha: [/COLOR]
[COLOR=#660033]while ((json = bufferedReader.readLine()) != null) {[/COLOR][COLOR=#808080])[/COLOR]
[COLOR=#ff0000]        at (nome do pacote).TelaPrincipal$1DownloadJSON.doInBackground(TelaPrincipal.java:441)[/COLOR][COLOR=#808080] (linha: [/COLOR]
[COLOR=#660033]class DownloadJSON extends AsyncTask {[/COLOR][COLOR=#808080])[/COLOR]
[COLOR=#ff0000]        at android.os.AsyncTask$2.call(AsyncTask.java:288)
        at java.util.concurrent.FutureTask.run(FutureTask.java:237)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
        at java.lang.Thread.run(Thread.java:841) 
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[FONT=Times New Roman][SIZE=3][COLOR=#006600][===========================][/COLOR][/SIZE][/FONT]
[FONT=Arial][SIZE=3]
[COLOR=#000000]O problema &eacute; que esse mesmo erro somente ocorre em dispositivos com [/COLOR][COLOR=#ff8000]API < 21 (Android 5.0)[/COLOR][COLOR=#000000], j&aacute; os mesmos com [/COLOR][COLOR=#ff8000]API > 21 (Android 5.0)[/COLOR][COLOR=#000000], n&atilde;o ocorre e o c&oacute;digo executa normalmente sem algum tipo de falha. Algu&eacute;m poderia me ajudar...?[/COLOR][/SIZE][/FONT]

Answer

[SIZE=5][COLOR=#59b300]Problema Resolvido.[/COLOR][/SIZE]

O problema estava no certificado. Adicionei os seguintes c&oacute;digos no m&eacute;todo protected void onCreate(Bundle savedInstanceState):

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[SIZE=3][FONT=Verdana]TrustManager[] trustAllCerts = new TrustManager[]{
new X509TrustManager() {
public java.security.cert.X509Certificate[] getAcceptedIssuers() {
return null;
}
public void checkClientTrusted(
java.security.cert.X509Certificate[] certs, String authType) {
}
public void checkServerTrusted(
java.security.cert.X509Certificate[] certs, String authType) {
}
}
};

try {
SSLContext sc = SSLContext.getInstance(SSL);
sc.init(null, trustAllCerts, new java.security.SecureRandom());
HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
} catch (Exception e) {
}[/FONT]
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[FONT=Times New Roman][SIZE=3][COLOR=#006600][======================][/COLOR]
[/SIZE][/FONT]
[FONT=Georgia][SIZE=4]Espero que isso ajude outras pessoas.[/SIZE][/FONT]

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