Android Library to discover nearby devices Offline
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sabzo Merge pull request #29 from sabzo/feature/update_lan_example
update lan example to use user-defined client.
Latest commit 4bdf1d1 Mar 25, 2018

README.md

Ayanda

Ayanda Ayanda is an Open Source Android Library that makes it easy to discover nearby devices and share files through a simple API. Ayanda is meant to detect nearby devices using WiFi and Bluetooth technolgy.

Usage

The example app in shows how to use Ayanda to discover devices on the local network, through Wifi Direct and through Bluetooth classic. Actions to be taken when nearby devices are discovered by each discovery method are defined by user defined interfaces.

/* Ex: Discovering Devices on Local Network */

// Define how to respond when nearby devices are discovered on network
ILan iLan = new ILan() {
    @Override
    public void deviceListChanged() {
        // Clear the list of discovered peers
        peers.clear();
        peerNames.clear();
        peersAdapter.clear();
        // update list with all peers within range
        peers.addAll(a.lanGetDeviceList());
        for (int i = 0; i < peers.size(); i++) {
            Lan.Device d = (Lan.Device) peers.get(i);
            peersAdapter.add(d.getName());
        }
    }
};

a = new Ayanda(this, null, iLan, null);
a.lanDiscover();
// INFO: lanDiscover() automatically makes an HTTP connection to services discovered

To share a file using NSD (LAN)

/* Share a file to nearby devices through LAN */

String filePath = "sdcard/somepic.jpg";
// NearbyMedia is a helper class to describe a file
NearbyMedia nearbyMedia = new NearbyMedia();
nearbyMedia.setMimeType("image/jpeg");
nearbyMedia.setTitle("pic");
nearbyMedia.setFileMedia(new File(filePath));

//get a JSON representation of any metadata we want to share
Gson gson = new GsonBuilder()
        .setDateFormat(DateFormat.FULL, DateFormat.FULL).create();
nearbyMedia.mMetadataJson = gson.toJson("key:value");

// Share the file to devices on LAN registered for current service
try {
    // Will store on nearby device's "Download" folder.
    a.lanShare(nearbyMedia);
} catch (IOException e) {
    e.printStackTrace();
}

Discovering nearby devices by WifiDirect

/* Discovering nearby devices by WifiDirect */

a = new Ayanda(this, null, null, new IWifiDirect() {
        @Override
        public void wifiP2pStateChangedAction(Intent intent) {

        }

        // Decide what to do when the list of nearby devices changes
        @Override
        public void wifiP2pPeersChangedAction() {
            peers.clear();
            peers.addAll(a.wdGetDevicesDiscovered() );
            peerNames.clear();
            for (int i = 0; i < peers.size(); i++) {
                WifiP2pDevice device = (WifiP2pDevice) peers.get(i);
                peersAdapter.add(device.deviceName);
            }
        }

        @Override
        public void wifiP2pConnectionChangedAction(Intent intent) {
        }

        @Override
        public void wifiP2pThisDeviceChangedAction(Intent intent) {
        }
    });
    
a.wdDiscover();

Sharing a file (bytes) using Bluetooth

  a = new Ayanda(this, new IBluetooth() {
            @Override
            public void actionDiscoveryStarted(Intent intent) {}

            @Override
            public void actionDiscoveryFinished(Intent intent) {}

            @Override
            public void stateChanged(Intent intent) {}

            @Override
            public void scanModeChange(Intent intent) {}

            @Override
            public void actionFound(Intent intent) {
                peersAdapter.clear();
                peersAdapter.addAll(a.btGetDeviceNamesDiscovered());
                devices = a.btGetDevices();
            }

            @Override
            public void dataRead(byte[] bytes, int length) {
                String readMessage = new String(bytes, 0, length);
                Toast.makeText(BluetoothActivity.this, readMessage, Toast.LENGTH_LONG)
                        .show();
            }

            // Send "Hello World" after connecting to a device
            @Override
            public void connected(BluetoothDevice device) {
                String message = "Hello World";
                try {
                    a.btSendData(device, message.getBytes()); // maybe a class for a device that's connected
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }, null, null);
        // Discover nearby Bluetooth devices paired or not
        a.btDiscover();
        // Connect to device from list
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int pos, long l) {
            BluetoothDevice device = devices.get(peerNames.get(pos));
            a.btConnect(device); // will trigger "connected" event
        }

See Example App in the app folder for more implementation details.

License

Copyright [2017] [Sabelo Mhlambi]

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.