Android Wi-Fi Direct：onPeers Available

我正在開發基於WiFi Direct的簡單應用程序，該應用程序必須連接兩個設備。爲此，我需要調用onPeersAvailable（myPeerListListener）的función，但我不知道如何。Android Wi-Fi Direct：onPeers Available

我的應用程序有這兩個元素：

1-主要活動：

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; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_wifi_direct); 


     //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); 

     //Layout 
     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(); 
     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); 




     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 
        } 
       }); 


       onPeersAvailable(myPeerListListener); 

      } 


     }; 

     btnScan.setOnClickListener(ScanListener); 

    } 


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

    // 


    @Override 
    protected void onResume() { 
     super.onResume(); 
     registerReceiver(mReceiver, mIntentFilter); 
    } 

    // unregister the broadcast receiver 
    @Override 
    protected void onPause() { 
     super.onPause(); 
     unregisterReceiver(mReceiver); 
    } 

}

2類廣播接收器：

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) { 

     super(); 
     this.manager = manager; 
     this.channel = channel; 
     this.activity = activity; 
     // this.context= context; 
    } 

    @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 
      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); 
       manager.onPeersAvailable(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 
     } 
    } 
}

直到現在我的代碼應該能夠檢測周圍的同齡人設備運行應用程序，該ID應存儲在變量myPeerListListener。所有這一切都在第二個發生打算叫OnReceiv（）的廣播接收器的方法，通過調用：

manager.requestPeers(channel, myPeerListListener);

現在我想操縱該列表。所以下面應該調用requestPeers API的信息，你可以看到這裏的API：

http://developer.android.com/guide/topics/connectivity/wifip2p.html

*第情迷同行

所以，我曾嘗試是寫一個呼叫的下方，：

manager.onPeersAvailable(myPeerListListener);

，但我得到這個錯誤：

該方法onPeersAvailable（WifiP2pManager.PeerListListener）未定義的類型WifiP2pManager

任何人都可以告訴我怎麼能將PeerListListener正確地發送到主要活動？

非常感謝您的寶貴時間

來源

2012-10-25 Ignacio Alorre

應實現PeerListListener內onPeersAvailable方法。

欲瞭解更多信息，請參閱http://developer.android.com/training/connect-devices-wirelessly/wifi-direct.html。

來源

2012-11-07 04:16:39 dtheo

dtheo已回答並指出有關此主題的Android教程。我將只對OP的代碼進行更改，以顯示如何實現所需的功能。

據官方Android引導here，該wifip2p發現API應該以這種方式使用：

在您的MainActivity類別：

mManager.discoverPeers(mChannel, new WifiP2pManager.ActionListener() { 
    public void onSuccess() { 
     TextDebug.setText("Ha habido éxito buscando Peers"); 
    } 

    public void onFailure(int reasonCode) { 
     TextDebug.setText("Algo ha salido mal buscando Peers"); 
    } 
}); 

// ############# DELETE THE FOLLOWING LINE ############# 
onPeersAvailable(myPeerListListener); // <<<<<<< DELETE THIS LINE

而在你的廣播接收器類，請執行下列操作相反：

@Override 
public void onReceive(Context context, Intent intent) { 
    ...  
    if (WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION.equals(action)) { 
     ... 
    } else if (WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION.equals(action)) { 
     if (manager != null) { 
      manager.requestPeers(channel, new WifiP2pManager.PeerListListener() { 
      @Override 
      public void onPeersAvailable(WifiP2pDeviceList peers) { 
       Log.d(TAG,String.format("PeerListListener: %d peers available, updating device list", peers.getDeviceList().size())); 

       // DO WHATEVER YOU WANT HERE 
       // YOU CAN GET ACCESS TO ALL THE DEVICES YOU FOUND FROM peers OBJECT 

      } 
     }); 
     } 
    } 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 
    } 
}

來源

2014-03-22 10:34:03

Thx Zhang。爲我節省了時間。乾杯。 – greenspand

dtheo已回答了問題。

我只想添加一個小小的注意事項：對於Wi-Fi Direct，兩臺設備需要同時掃描以發現對方。還有一個掃描超時，這意味着一段時間後發現性可能會丟失。 Thr Zhang。

來源

2014-11-04 09:12:55

Android Wi-Fi Direct：onPeers Available

回答

相關問題