Android FileInputStream and Socket

I have set server and run following codes. The server runs well but the android program stops while running. The android program is to input a certificate file and send it to server by socket. I don't know what's wrong with my codes. Thanks!

private Socket client; private Button button; private ObjectOutputStream out = null; AssetManager assetManager = getAssets(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button = (Button) findViewById(; button.setOnClickListener(new OnClickListener() { public void onClick(View v) { new Thread (new Runnable() { public void run() { try { client = new Socket("", 4444); out = new ObjectOutputStream(client.getOutputStream()); AssetFileDescriptor afd = assetManager.openFd("client.crt"); FileInputStream in = afd.createInputStream(); CertificateFactory of = CertificateFactory.getInstance("X.509"); ceof = of.generateCertificate(in); X509Certificate clientcert = (X509Certificate) ceof; out.writeObject(clientcert); } catch(Exception e) { e.printStackTrace(); } } }).start(); } }); }

Category:android Views:1 Time:2017-05-17

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