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POSending data among multiple Android devices
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copied!<p>I need a way to send data among multiple Android devices within around ~50 ft bidirectionally. Basically the idea is that one device sends all the other devices within the area a small amount of data and all the other devices send back a small amount of data.</p> <p>After a couple hours of research, I came across multiple ways to implement this: Wi-fi p2p, external server, etc.</p> <p>As far as I know, Wi-fi P2P only let's you connect to one device at a time, which is not what I am trying to accomplish, since I need the device to communicate to multiple devices simultaneously. Also, this way limits my application to enforce the devices to be within the same wireless network.</p> <p>Using an external server would allow as many devices to communicate with one another, but I have no idea how one device would detect devices within a vicinity using this method. I was thinking maybe the devices could communicate their coordinates to the server and have the server analyze the proximity of the devices connected, but I wasn't entirely sure.</p> <p>I am pretty new to Android programming as well as network programming, so any help to guide me in the right direction would be appreciated.</p> <p>Thank you.</p> <hr> <p>Edit:</p> <p>Here's what I have so far. It has no networking elements to it yet. It simply accesses the stock music app and retrieves the current track information. I want to be able to send this information to all nearby devices.</p> <pre><code>public class MainActivity extends Activity { public static final String SERVICECMD = "com.android.music.musicservicecommand"; public static final String CMDNAME = "command"; public static final String CMDTOGGLEPAUSE = "togglepause"; public static final String CMDSTOP = "stop"; public static final String CMDPAUSE = "pause"; public static final String CMDPREVIOUS = "previous"; public static final String CMDNEXT = "next"; public String song_artist = ""; public String song_track = ""; public String song_album = ""; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); IntentFilter iF = new IntentFilter(); iF.addAction("com.android.music.metachanged"); iF.addAction("com.android.music.playstatechanged"); iF.addAction("com.android.music.playbackcomplete"); iF.addAction("com.android.music.queuechanged"); registerReceiver(mReceiver, iF); } private BroadcastReceiver mReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); String cmd = intent.getStringExtra("command"); Log.d("mIntentReceiver.onReceive ", action + " / " + cmd); String artist = intent.getStringExtra("artist"); String album = intent.getStringExtra("album"); String track = intent.getStringExtra("track"); TextView music_info = (TextView) findViewById(R.id.musicview); music_info.setText("Track: "+track+ "\nArtist: "+artist+ "\nAlbum: "+album); } }; } </code></pre>

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