Wi-Fi direct

Разрешения в AndroidManifest

public class MainActivity extends AppCompatActivity {

   private final String MAIN_TAG = "MAIN_TAG";

   private final IntentFilter intentFilter = new IntentFilter();

   private WiFiDirectBroadcastReceiver receiver;

   WifiP2pManager.Channel channel;

   WifiP2pManager p2pManager;

   WifiManager wifiManager;

   private Button searchButton, wifiButton;

   private TextView statusTextView;

   private ListView listView;

   private List<WifiP2pDevice> peers = new ArrayList<WifiP2pDevice>();

   String[] deviceNameArray;

   WifiP2pDevice[] deviceArray;

   @Override

   protected void onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       setContentView(R.layout.activity_main);

       init();

       exqListener();

   }

   WifiP2pManager.ConnectionInfoListener connectionInfoListener = new WifiP2pManager.ConnectionInfoListener() {

       @Override

       public void onConnectionInfoAvailable(WifiP2pInfo info) {

           final InetAddress inetAddress = info.groupOwnerAddress;

           if (info.groupFormed && info.isGroupOwner) {

               setStatus("Host");

           } else {

               setStatus("Client");

           }

       }

   };

   private void init() {

       statusTextView = findViewById(R.id.txt_status);

       searchButton = findViewById(R.id.btn_search);

       wifiButton = findViewById(R.id.btn_wifi);

       listView = findViewById(R.id.list_device);

       wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);

       wifiButton.setText(!wifiManager.isWifiEnabled() ? "ON" : "OFF");

       p2pManager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);

       channel = p2pManager.initialize(this, getMainLooper(), null);

       intentFilter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION);

       intentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION);

       intentFilter.addAction(WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION);

       intentFilter.addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION);

   }

   WifiP2pManager.PeerListListener peerListListener = new WifiP2pManager.PeerListListener() {

       @Override

       public void onPeersAvailable(WifiP2pDeviceList peersList) {

           if (!peersList.getDeviceList().equals(peers)) {

               peers.clear();

               peers.addAll(peersList.getDeviceList());

               deviceNameArray = new String[peersList.getDeviceList().size()];

               deviceArray = new WifiP2pDevice[peersList.getDeviceList().size()];

               int ind = 0;

               for (WifiP2pDevice device : peersList.getDeviceList()) {

                   deviceNameArray[ind] = device.deviceName;

                   deviceArray[ind] = device;

                   ind++;

               }

               ArrayAdapter<String> adapter = new ArrayAdapter<>(getApplicationContext(), android.R.layout.simple_list_item_1, deviceNameArray);

               listView.setAdapter(adapter);

           }

           if (peers.size() == 0) {

               Toast.makeText(getApplicationContext(), "No device found", Toast.LENGTH_LONG).show();

           }

       }

   };

   private void exqListener() {

       wifiButton.setOnClickListener(new View.OnClickListener() {

           @Override

           public void onClick(View v) {

               if (wifiManager.isWifiEnabled()) {

                   wifiManager.setWifiEnabled(false);

                   wifiButton.setText("ON");

               } else {

                   wifiManager.setWifiEnabled(true);

                   wifiButton.setText("OFF");

               }

           }

       });

       searchButton.setOnClickListener(new View.OnClickListener() {

           @Override

           public void onClick(View v) {

               p2pManager.discoverPeers(channel, new WifiP2pManager.ActionListener() {

                   @Override

                   public void onSuccess() {

                       statusTextView.setText("Discover is started");

                   }

                   @Override

                   public void onFailure(int reason) {

                       statusTextView.setText("Discover started failed");

                   }

               });

           }

       });

   }

   @Override

   public void onResume() {

       super.onResume();

       receiver = new WiFiDirectBroadcastReceiver(p2pManager, channel, this);

       registerReceiver(receiver, intentFilter);

   }

   @Override

   public void onPause() {

       super.onPause();

       unregisterReceiver(receiver);

   }

   public void setStatus(String text) {

       statusTextView.setText(text);

   }

}