Android/Java WiFi直接对等列表

1 周，2 日 Questions & Answers 7936

哟

我正试图通过WiFi Direct的奇妙之处，让一台Android设备（它是Nexus 7，尽管我无法想象这有多重要）与一个覆盆子Pi进行通信。据推测这是可能的，六个小时前，这似乎是一个比走服务器-客户端路线更好的解决方案，但我遇到了一些问题

Android开发者网站很好，因为它有两个指南：

http://developer.安卓.com/training/connect-devices-wirelessly/wifi-direct.html http://developer.安卓.com/guide/topics/connectivity/wifip2p.html

这很可爱，因为我在Java方面没有丰富的经验。但问题是。。。事实上，在那个网站上，很多人认为代码中的元素（比如放东西的位置）经常会丢失

我已经非常仔细地遵循了这两个指南，但我遇到了一个问题——WIFI_P2P_PEERS_CHANGED_ACTION Intential从不广播，所以当我寻找同伴时，它会启动搜索，说一切都很好，但不会给我结果列表。。。我猜应该是这样

一天的大部分时间里，我都在努力解决这个问题，因为我得了一个很好的花粉热，让生活变得更加甜蜜

代码：

活动：

package com.example.bingotest;

import java.util.ArrayList;
import java.util.List;

import 安卓.net.wifi.p2p.WifiP2pDevice;
import 安卓.net.wifi.p2p.WifiP2pDeviceList;
import 安卓.net.wifi.p2p.WifiP2pManager;
import 安卓.net.wifi.p2p.WifiP2pManager.Channel;
import 安卓.net.wifi.p2p.WifiP2pManager.PeerListListener;
import 安卓.os.Build;
import 安卓.os.Bundle;
import 安卓.annotation.TargetApi;
import 安卓.app.Activity;
import 安卓.content.BroadcastReceiver;
import 安卓.content.Context;
import 安卓.content.Intent;
import 安卓.content.IntentFilter;
import 安卓.content.pm.ActivityInfo;
import 安卓.util.Log;
import 安卓.view.Menu;

public class BingoActivity extends Activity {

    private BingoView _view;

    private IntentFilter _intentFilter = new IntentFilter();

    private BroadcastReceiver _broadcastReceiver = null;
    private WifiP2pManager _manager;
    private Channel _channel;

    private List _peers = new ArrayList();
    private PeerListListener _peerListListener;

    //-------------------------------------------------------------------------------

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        _view = new BingoView(this);
        setContentView(_view);

        _intentFilter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION);
        _intentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION);
        _intentFilter.addAction(WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION);
        _intentFilter.addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION);

        _manager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);
        _channel = _manager.initialize(this, getMainLooper(), null);
        //_broadcastReceiver = new WiFiDirectBroadcastReceiver(_manager, _channel, this);
        //registerReceiver(_broadcastReceiver, _intentFilter);

        _peerListListener = new PeerListListener() {
            @Override
            public void onPeersAvailable(WifiP2pDeviceList peerList) {
                Log.d("wifi", "here");
                 // Out with the old, in with the new.
                _peers.clear();
                _peers.addAll(peerList.getDeviceList());

                if (_peers.size() == 0) {
                    Log.d("wifi", "No devices found");
                    return;
                }
            }
        };
    }

    //-------------------------------------------------------------------------------

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.bingo, menu);
        return true;
    }

    //-------------------------------------------------------------------------------

    @Override
    public void onResume() {
        super.onResume();
        _broadcastReceiver = new WiFiDirectBroadcastReceiver(_manager, _channel, this, _peerListListener);
        registerReceiver(_broadcastReceiver, _intentFilter);
    }

    //-------------------------------------------------------------------------------

    @Override
    public void onPause() {
        super.onPause();
        unregisterReceiver(_broadcastReceiver);
    }

}

WiFiDirectBroadcastReceiver类：

package com.example.bingotest;

import java.util.ArrayList;
import java.util.List;

import 安卓.content.BroadcastReceiver;
import 安卓.content.Context;
import 安卓.content.Intent;
import 安卓.net.wifi.p2p.WifiP2pManager;
import 安卓.net.wifi.p2p.WifiP2pManager.Channel;
import 安卓.net.wifi.p2p.WifiP2pManager.PeerListListener;
import 安卓.util.Log;

public class WiFiDirectBroadcastReceiver extends BroadcastReceiver {
    private WifiP2pManager _manager;
    private Channel _channel;
    private BingoActivity _activityRef;
    private List _peers = new ArrayList();

    PeerListListener _peerListListener;


    //-------------------------------------------------------------------------------

    public WiFiDirectBroadcastReceiver(WifiP2pManager manager, Channel channel, BingoActivity activity, PeerListListener peerListListener) {
        super();
        _manager = manager;
        _channel = channel;
        _activityRef = activity;        
        _peerListListener = peerListListener;


        _manager.discoverPeers(_channel, new WifiP2pManager.ActionListener() {
            @Override
            public void onSuccess() {
                Log.d("wifi", "onsuccess");
            }

            @Override
            public void onFailure(int reasonCode) {
                Log.d("wifi", "onfailure");
            }
        });



    }

    //-------------------------------------------------------------------------------

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();

        Log.d("wifi", "receive: " + 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) {
                Log.d("wifi", "WIFI DIRECT ON");

            } else {
                Log.d("wifi", "WIFI DIRECT OFF");
            }

        }
        else if (WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION.equals(action)) {
            Log.d("wifi", "Peers changed");        
            if (_manager != null) {
                _manager.requestPeers(_channel, _peerListListener);
            }

        }
        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
        }

    }

    //-------------------------------------------------------------------------------

}

（为潜在的混乱和浪费代码道歉——我一直在尝试获得结果）

非常感谢你的帮助。我猜PeerListener来错地方了。我对安卓系统的了解很少

提前谢谢

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Android/Java WiFi直接对等列表

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