// Create a WifiP2pManager instance
WifiP2pManager manager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);

// Create a WifiP2pManager.Channel instance
WifiP2pManager.Channel channel = manager.initialize(this, getMainLooper(), null);

// Discover nearby devices
manager.discoverPeers(channel, new WifiP2pManager.ActionListener() {
    @Override
    public void onSuccess() {
        // Peers discovered successfully
    }

    @Override
    public void onFailure(int reasonCode) {
        // Failed to discover peers
    }
});

// Connect to a specific device
WifiP2pConfig config = new WifiP2pConfig();
config.deviceAddress = "device_mac_address";
manager.connect(channel, config, new WifiP2pManager.ActionListener() {
    @Override
    public void onSuccess() {
        // Connection successful
    }

    @Override
    public void onFailure(int reasonCode) {
        // Connection failed
    }
});