Recentemente, sigo os passos dados emDesenvolvedor.Android.Com

Mas parece que tenho um pouco de sorte por lá. Tentei descobrir os pares disponíveis nas proximidades, colocá-los no arraylist, mas parece não ter sorte. Eu não recebi nada.

Meus dispositivos reais 2 são realmente o Android 4.1 e 4.2, uma vez que o Wifi Direct é baseado no nível API 14, que é o Android 4.0+, então eu acho que o meu dispositivo real não é o problema.

O conceito que eu uso é usar 1 atividade e 1 BroadCast Receiver.

Por favor, dê uma olhada no meu código, eu coloquei errado ou algo que esqueci?

Chat1Activity.java

package com.example.androtut;

import java.util.ArrayList;

import others.MyBroadcastReceiver;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;

import android.content.IntentFilter;
import android.net.wifi.p2p.WifiP2pDeviceList;
import android.net.wifi.p2p.WifiP2pManager;
import android.net.wifi.p2p.WifiP2pManager.Channel;
import android.net.wifi.p2p.WifiP2pManager.PeerListListener;
import android.os.Bundle;
import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class Chat1Activity extends Activity {

    private final IntentFilter mintentFilter = new IntentFilter();
    private Channel mChannel;
    private WifiP2pManager mManager;
    private BroadcastReceiver mReceiver;
    private ArrayList peers = new ArrayList();
    private PeerListListener myPeerListListener = new PeerListListener() {
        @Override
        public void onPeersAvailable(WifiP2pDeviceList peerList) {

            // Out with the old, in with the new.
            peers.clear();
            peers.addAll(peerList.getDeviceList());

            // If an AdapterView is backed by this data, notify it
            // of the change.  For instance, if you have a ListView of available
            // peers, trigger an update.

            if (peers.size() == 0) {
                Toast.makeText(getApplicationContext(),"Nothing found!", Toast.LENGTH_LONG).show();
                return;
            } else {
                Toast.makeText(getApplicationContext(),"We've found " + peers.size() + " users", Toast.LENGTH_LONG).show();
            }


        }
    };


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_chat1);

        //Toast.makeText(getApplicationContext(), "Wifi is okay", Toast.LENGTH_LONG).show();    

        prepareIntentFilter();

        Button btn_startchat = (Button) findViewById(R.id.btn_startchat);

        // Listening to News Feed button click
        btn_startchat.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                // Launching News Feed Screen
                detectPeers();
            }
        });

        mManager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);
        mChannel = mManager.initialize(this, getMainLooper(), null);
    }


    private void detectPeers(){

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

            @Override
            public void onSuccess() {
                // Code for when the discovery initiation is successful goes here.
                // No services have actually been discovered yet, so this method
                // can often be left blank.  Code for peer discovery goes in the
                // onReceive method, detailed below.
            }

            @Override
            public void onFailure(int reasonCode) {
                // Code for when the discovery initiation fails goes here.
                // Alert the user that something went wrong.
            }
    });




    }


    @Override
    protected void onResume() {
        super.onResume();
        mReceiver = new MyBroadcastReceiver(mManager, mChannel, this, myPeerListListener);
        registerReceiver(mReceiver, mintentFilter);
    }
    /* unregister the broadcast receiver */
    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(mReceiver);
    }

    private void prepareIntentFilter() {

        mintentFilter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION);
        // Indicates a change in the list of available peers.
        mintentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION);
        // Indicates the state of Wi-Fi P2P connectivity has changed.
        mintentFilter.addAction(WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION);
        // Indicates this device's details have changed.
        mintentFilter.addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION);

    }


}

E aMyBroadcastReceiver.java

package others;

import java.util.ArrayList;

import com.example.androtut.Chat1Activity;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.wifi.p2p.WifiP2pDevice;
import android.net.wifi.p2p.WifiP2pDeviceList;
import android.net.wifi.p2p.WifiP2pManager;
import android.net.wifi.p2p.WifiP2pManager.Channel;
import android.net.wifi.p2p.WifiP2pManager.PeerListListener;
import android.widget.Toast;

public class MyBroadcastReceiver extends BroadcastReceiver {

    private WifiP2pManager mManager;
    private Channel mChannel;
    private Chat1Activity mActivity;
    private PeerListListener myPeerListListener;



    public MyBroadcastReceiver(WifiP2pManager manager, Channel channel,
            Chat1Activity activity, PeerListListener obPeerList) {
        super();
        this.mManager = manager;
        this.mChannel = channel;
        this.mActivity = activity;
        this.myPeerListListener = obPeerList;
    }

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

            if (mManager != null) {
                mManager.requestPeers(mChannel, 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



        }

        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) {
                // Wifi P2P is enabled
                Toast.makeText(mActivity.getApplicationContext(),"Wifi is okay", Toast.LENGTH_LONG).show();

            } else {
                // Wi-Fi P2P is not enabled
                Toast.makeText(mActivity.getApplicationContext(),
                        "Wifi is not okay", Toast.LENGTH_LONG).show();
            }
        }

    }

}