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POTransfer Data between Android devices using wifi direct?
 

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  1. POTransfer Data between Android devices using wifi direct?
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    <p>I have recently implement wifi direct into my project,my aim is pass string value between two wifidirect connected devices when some of my app condition satisfies.right now i have listed all peers and also made connection between the selected peer.what my idea is to pass a json file between the devices.so before try to execute that idea i try to pass a image file between two devices.i followed the steps from the android wifidirect tutorial.listing peers and the connection between the peers is success full but i cant pass the data between the devices.the follwing is my code. FileTransferService.java</p> <pre><code>package jing.app.directwifi; import android.app.IntentService; import android.content.ContentResolver; import android.content.Context; import android.content.Intent; import android.net.Uri; import android.util.Log; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.InetSocketAddress; import java.net.Socket; /** * A service that process each file transfer request i.e Intent by opening a * socket connection with the WiFi Direct Group Owner and writing the file */ public class FileTransferService extends IntentService { private static final int SOCKET_TIMEOUT = 5000; public static final String ACTION_SEND_FILE = "jing.app.directwifi.SEND_FILE"; public static final String EXTRAS_FILE_PATH = "file_url"; public static final String EXTRAS_GROUP_OWNER_ADDRESS = "go_host"; public static final String EXTRAS_GROUP_OWNER_PORT = "go_port"; public FileTransferService(String name) { super(name); } public FileTransferService() { super("FileTransferService"); } /* * (non-Javadoc) * @see android.app.IntentService#onHandleIntent(android.content.Intent) */ @Override protected void onHandleIntent(Intent intent) { Context context = getApplicationContext(); if (intent.getAction().equals(ACTION_SEND_FILE)) { String fileUri = intent.getExtras().getString(EXTRAS_FILE_PATH); String host = intent.getExtras().getString(EXTRAS_GROUP_OWNER_ADDRESS); Socket socket = new Socket(); int port = intent.getExtras().getInt(EXTRAS_GROUP_OWNER_PORT); try { // Log.d(WiFiDirectActivity.TAG, "Opening client socket - "); socket.bind(null); socket.connect((new InetSocketAddress(host, port)), SOCKET_TIMEOUT); Log.d("connected", "Client socket - " + socket.isConnected()); OutputStream stream = socket.getOutputStream(); ContentResolver cr = context.getContentResolver(); InputStream is = null; try { is = cr.openInputStream(Uri.parse(fileUri)); } catch (FileNotFoundException e) { Log.d("exp", e.toString()); } MainActivity.copyFile(is, stream); Log.d("exp" ,"Client: Data written"); } catch (IOException e) { Log.e("exp", e.getMessage()); } finally { if (socket != null) { if (socket.isConnected()) { try { socket.close(); } catch (IOException e) { // Give up e.printStackTrace(); } } } } } } } </code></pre> <p>Main Activity.java</p> <pre><code>package jing.app.directwifi; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.ServerSocket; import java.net.Socket; import java.util.ArrayList; import java.util.Collection; import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.app.DialogFragment; import android.content.BroadcastReceiver; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.IntentFilter; import android.net.Uri; import android.net.wifi.WifiInfo; import android.net.wifi.WifiManager; import android.net.wifi.p2p.WifiP2pConfig; import android.net.wifi.p2p.WifiP2pDevice; import android.net.wifi.p2p.WifiP2pDeviceList; import android.net.wifi.p2p.WifiP2pInfo; import android.net.wifi.p2p.WifiP2pManager; import android.net.wifi.p2p.WifiP2pManager.ActionListener; import android.net.wifi.p2p.WifiP2pManager.Channel; import android.net.wifi.p2p.WifiP2pManager.ConnectionInfoListener; import android.net.wifi.p2p.WifiP2pManager.PeerListListener; import android.os.AsyncTask; import android.os.Bundle; import android.os.Environment; import android.provider.Settings; import android.util.Log; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity implements OnClickListener, android.content.DialogInterface.OnClickListener, ConnectionInfoListener { private WifiP2pManager mManager; private Channel mChannel; private BroadcastReceiver mReceiver; private IntentFilter mIntentFilter; private Button mDiscover; private TextView mDevices; public ArrayAdapter mAdapter; private ArrayList&lt;WifiP2pDevice&gt; mDeviceList = new ArrayList&lt;WifiP2pDevice&gt;(); protected static final int CHOOSE_FILE_RESULT_CODE = 20; int flag=0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mDiscover = (Button) findViewById(R.id.discover); mDiscover.setOnClickListener(this); mDevices = (TextView) findViewById(R.id.peers); mManager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE); mChannel = mManager.initialize(this, getMainLooper(), null); mReceiver = new WiFiDirectReceiver(mManager, mChannel, this); mIntentFilter = new IntentFilter(); mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION); mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION); mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION); mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION); } @Override protected void onResume() { super.onResume(); registerReceiver(mReceiver, mIntentFilter); } @Override protected void onPause() { super.onPause(); unregisterReceiver(mReceiver); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; } private class WiFiDirectReceiver extends BroadcastReceiver { private WifiP2pManager mManager; private Channel mChannel; private MainActivity mActivity; public WiFiDirectReceiver(WifiP2pManager manager, Channel channel, MainActivity activity) { super(); mManager = manager; mChannel = channel; mActivity = activity; } @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION.equals(action)) { int state = intent.getIntExtra(WifiP2pManager.EXTRA_WIFI_STATE, -1); if (state == WifiP2pManager.WIFI_P2P_STATE_ENABLED) { String title = "ANDROID_ID[" + getAndroid_ID() + "]"; title += " MAC[" + getMACAddress() + "]"; Toast.makeText(mActivity, "Wi-Fi Direct is enabled."+title, Toast.LENGTH_SHORT).show(); } else { Toast.makeText(mActivity, "Wi-Fi Direct is disabled.", Toast.LENGTH_SHORT).show(); } } else if (WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION.equals(action)) { if (mManager != null) { mManager.requestPeers(mChannel, new PeerListListener() { @Override public void onPeersAvailable(WifiP2pDeviceList peers) { if (peers != null) { mDeviceList.addAll(peers.getDeviceList()); ArrayList&lt;String&gt; deviceNames = new ArrayList&lt;String&gt;(); for (WifiP2pDevice device : mDeviceList) { deviceNames.add(device.deviceName); } if (deviceNames.size() &gt; 0) { mAdapter = new ArrayAdapter&lt;String&gt;(mActivity, android.R.layout.simple_list_item_1, deviceNames); if(flag==0) { flag=1; showDeviceListDialog(); } } else { Toast.makeText(mActivity, "Device list is empty.", Toast.LENGTH_SHORT).show(); } } } }); } } else if (WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION.equals(action)) { } else if (WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION.equals(action)) { } } } @Override public void onClick(View v) { switch (v.getId()) { case R.id.discover: onDiscover(); break; } } private void onDiscover() { mManager.discoverPeers(mChannel, new ActionListener() { @Override public void onSuccess() { Toast.makeText(MainActivity.this, "Discover peers successfully.", Toast.LENGTH_SHORT).show(); } @Override public void onFailure(int reason) { Toast.makeText(MainActivity.this, "Discover peers failed.", Toast.LENGTH_SHORT).show(); } }); } private void showDeviceListDialog() { DeviceListDialog deviceListDialog = new DeviceListDialog(); deviceListDialog.show(getFragmentManager(), "devices"); } private class DeviceListDialog extends DialogFragment { @Override public Dialog onCreateDialog(Bundle savedInstanceState) { AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); builder.setTitle("Select a device") .setSingleChoiceItems(mAdapter, 0, MainActivity.this) .setNegativeButton("Cancel", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); return builder.create(); } } @Override public void onClick(DialogInterface dialog, int which) { onDeviceSelected(which); dialog.dismiss(); } private void onDeviceSelected(int which) { WifiP2pDevice device = mDeviceList.get(which); if (device == null) { return; } WifiP2pConfig config = new WifiP2pConfig(); config.deviceAddress = device.deviceAddress; mManager.connect(mChannel, config, new ActionListener() { @Override public void onSuccess() { Toast.makeText(MainActivity.this, "Connected", Toast.LENGTH_SHORT).show(); Intent intent = new Intent(Intent.ACTION_GET_CONTENT); intent.setType("image/*"); startActivityForResult(intent, CHOOSE_FILE_RESULT_CODE); } @Override public void onFailure(int reason) { Toast.makeText(MainActivity.this, "Failed to connect", Toast.LENGTH_SHORT).show(); } }); } /** * ANDROID_ID */ private String getAndroid_ID() { return Settings.Secure.getString(getContentResolver(), Settings.Secure.ANDROID_ID); } /** * Wi-Fi MAC */ private String getMACAddress() { WifiManager manager = (WifiManager) getSystemService(Context.WIFI_SERVICE); WifiInfo wifiInfo = manager.getConnectionInfo(); String mac = wifiInfo.getMacAddress(); // After the group negotiation, we assign the group owner as the file // server. The file server is single threaded, single connection server // socket. new FileServerAsyncTask(getApplicationContext()) .execute(); return mac; } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { // User has picked an image. Transfer it to group owner i.e peer using // FileTransferService. Uri uri = data.getData(); Log.d("intent", "Intent----------- " + uri); Intent serviceIntent = new Intent(MainActivity.this, FileTransferService.class); serviceIntent.setAction(FileTransferService.ACTION_SEND_FILE); serviceIntent.putExtra(FileTransferService.EXTRAS_FILE_PATH, uri.toString()); serviceIntent.putExtra(FileTransferService.EXTRAS_GROUP_OWNER_ADDRESS, getMACAddress()); serviceIntent.putExtra(FileTransferService.EXTRAS_GROUP_OWNER_PORT, 8988); startService(serviceIntent); } /** * A simple server socket that accepts connection and writes some data on * the stream. */ public static class FileServerAsyncTask extends AsyncTask&lt;Void, Void, String&gt; { private Context context; /** * @param context * @param statusText */ public FileServerAsyncTask(Context context) { this.context = context; } @Override protected String doInBackground(Void... params) { try { System.out.println("insideeeeeeeeeeeeeeeeeeeeeeee"); ServerSocket serverSocket = new ServerSocket(8988); Log.d("Server: Socket opened", "Server: Socket opened"); Socket client = serverSocket.accept(); Log.d("Server: connection done", "Server: connection done"); final File f = new File(Environment.getExternalStorageDirectory() + "/" + context.getPackageName() + "/wifip2pshared-" + System.currentTimeMillis() + ".jpg"); File dirs = new File(f.getParent()); if (!dirs.exists()) dirs.mkdirs(); f.createNewFile(); Log.d("server: copying files ", "server: copying files " + f.toString()); InputStream inputstream = client.getInputStream(); copyFile(inputstream, new FileOutputStream(f)); serverSocket.close(); return f.getAbsolutePath(); } catch (IOException e) { Log.e("exp", e.getMessage()); System.out.println(":iooo:"+e); return null; } } /* * (non-Javadoc) * @see android.os.AsyncTask#onPostExecute(java.lang.Object) */ @Override protected void onPostExecute(String result) { if (result != null) { Intent intent = new Intent(); intent.setAction(android.content.Intent.ACTION_VIEW); intent.setDataAndType(Uri.parse("file://" + result), "image/*"); context.startActivity(intent); } } /* * (non-Javadoc) * @see android.os.AsyncTask#onPreExecute() */ @Override protected void onPreExecute() { } } public static boolean copyFile(InputStream inputStream, OutputStream out) { byte buf[] = new byte[1024]; int len; long startTime=System.currentTimeMillis(); try { while ((len = inputStream.read(buf)) != -1) { out.write(buf, 0, len); } out.close(); inputStream.close(); long endTime=System.currentTimeMillis()-startTime; Log.v("","Time taken to transfer all bytes is : "+endTime); } catch (IOException e) { Log.d("exp", e.toString()); return false; } return true; } @Override public void onConnectionInfoAvailable(WifiP2pInfo info) { // TODO Auto-generated method stub Toast.makeText(getApplicationContext(), "connectioninfoo", 3000).show(); } } </code></pre> <p>Manifest</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="jing.app.directwifi" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="14" android:targetSdkVersion="16" /&gt; &lt;uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /&gt; &lt;uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /&gt; &lt;uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" /&gt; &lt;uses-permission android:name="android.permission.INTERNET" /&gt; &lt;uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /&gt; &lt;uses-permission android:name="android.permission.READ_PHONE_STATE" /&gt; &lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /&gt; &lt;!-- Market filtering --&gt; &lt;uses-feature android:name="android.hardware.wifi.direct" android:required="true" /&gt; &lt;application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" &gt; &lt;activity android:name="jing.app.directwifi.MainActivity" android:label="@string/app_name" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;!-- Used for transferring files after a successful connection --&gt; &lt;service android:name=".FileTransferService" android:enabled="true" /&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p>These are files used in my code .form the tutorial i have found that </p> <blockquote> <p>new FileServerAsyncTask(getApplicationContext()) .execute();</p> </blockquote> <p>where the the incomming data is begin accepted so when i need to execute this asyn thread,so anyone help me in which portion i have made the mistake.how can i transfer the file between devices .</p>
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    1. COIf you use the exact same code on wi-fi direct example, you would not have any problem regarding any process of the whole program. Still, I would say you better debug your code particularly for your copyFile method.
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