Ignacio Alorre Ignacio Alorre - 1 year ago 107
Android Question

Android Wi-Fi Direct: onPeersAvailable

I'm developping a simple application based on WiFi Direct for Android that has to connect two devices. To do so I need to call to the función onPeersAvailable(myPeerListListener), but I don't know how.

My app has this two elements:

1-Main Activity:

package android.nacho.WifiDirect;

import android.net.wifi.p2p.WifiP2pManager.Channel;

import android.net.wifi.p2p.WifiP2pManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class WifiDirect extends Activity {

WifiP2pManager mManager;
Channel mChannel;
BroadcastReceiver mReceiver;

IntentFilter mIntentFilter;

public void onCreate(Bundle savedInstanceState) {


//To register the BroadastReceiver
mManager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);
mChannel = mManager.initialize(this, getMainLooper(), null); //It was necessary to make a cast (Channel)
mReceiver = new WiFiBroadcastReceiver(mManager, mChannel, this); //, this);

final Button btnScan = (Button)findViewById(R.id.btnScan);
final TextView TextDebug=(TextView)findViewById(R.id.TextDebug);

//To define the filter in the BroadcastReceiver
mIntentFilter = new IntentFilter();

final OnClickListener ScanListener=new OnClickListener() //Sacado de TEstPsycologico
public void onClick(View v){

TextDebug.setText("Se intentan buscar Peers");

mManager.discoverPeers(mChannel, new WifiP2pManager.ActionListener() {

public void onSuccess() {

TextDebug.setText("Ha habido éxito buscando Peers");//DEBUG: Para ver si es posible encontrar Peers


public void onFailure(int reasonCode) {

TextDebug.setText("Algo ha salido mal buscando Peers"); //DEBUG: Para ver si pasó algo raro busando Peers






public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_wifi_direct, menu);
return true;


protected void onResume() {
registerReceiver(mReceiver, mIntentFilter);

// unregister the broadcast receiver
protected void onPause() {


2 Class BroadcastReceiver:

package android.nacho.WifiDirect;

import android.net.wifi.p2p.WifiP2pManager.Channel;
import android.net.wifi.p2p.WifiP2pManager.PeerListListener;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.wifi.p2p.WifiP2pManager;
import android.widget.Toast;

* A BroadcastReceiver that notifies of important Wi-Fi p2p events.

public class WiFiBroadcastReceiver extends BroadcastReceiver {

private WifiP2pManager manager;
private Channel channel;
private WifiDirect activity;
private PeerListListener myPeerListListener;

//For toast, add also context
//private Context context;

public WiFiBroadcastReceiver(WifiP2pManager manager, Channel channel, WifiDirect activity){//, Context context) {

this.manager = manager;
this.channel = channel;
this.activity = activity;
// this.context= context;

public void onReceive(Context context, Intent intent) {

String action = intent.getAction();

if (WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION.equals(action)) {

// Check to see if Wi-Fi is enabled and notify appropriate activity
int state = intent.getIntExtra(WifiP2pManager.EXTRA_WIFI_STATE, -1);
if (state == WifiP2pManager.WIFI_P2P_STATE_ENABLED) {

//Toast.makeText(context, "Wi-Fi Direct is enable", Toast.LENGTH_LONG).show();

} else {

//Toast.makeText(context, "Wi-Fi Direct is not enable", Toast.LENGTH_LONG).show();

} else if (WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION.equals(action)) {
// Call WifiP2pManager.requestPeers() to get a list of current peers

// request available peers from the wifi p2p manager. This is an
// asynchronous call and the calling activity is notified with a
// callback on PeerListListener.onPeersAvailable()
if (manager != null) {
manager.requestPeers(channel, myPeerListListener);


} else if (WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION.equals(action)) {
// Respond to new connection or disconnections
} else if (WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION.equals(action)) {
// Respond to this device's wifi state changing

Until now my code should be able to detect peers around the device running the app, which ID should be stored in the variable myPeerListListener. All this take place in the second intend of the BroadcastReceiver method called OnReceiv(), by calling:

manager.requestPeers(channel, myPeerListListener);

Now I want to manipulate that list. So following the API information it should be calling requestPeers, you can see the API on here:


*Section Discovering Peers

So what I have tried was to write below a call to:


but I get this error:

The method onPeersAvailable(WifiP2pManager.PeerListListener) is undefined for the type WifiP2pManager

Could anyone tell me how could I send the PeerListListener to the main activity properly?

Thank you very much for your time

Answer Source

You should implement the onPeersAvailable method inside the PeerListListener.

Please see http://developer.android.com/training/connect-devices-wirelessly/wifi-direct.html for more information.

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