我正在开发一个wifi p2p文件共享应用程序。但我无法发现同行
以下是我的活动代码
package com.neeraj8le.majorproject.activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.IntentFilter;
import android.net.wifi.p2p.WifiP2pDevice;
import android.net.wifi.p2p.WifiP2pDeviceList;
import android.net.wifi.p2p.WifiP2pManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import com.neeraj8le.majorproject.R;
import com.neeraj8le.majorproject.WiFiDirectBroadcastReceiver;
import java.util.ArrayList;
import java.util.List;
public class SelectPeerActivity extends AppCompatActivity{
WifiP2pManager mManager;
WifiP2pManager.Channel mChannel;
BroadcastReceiver mReceiver;
IntentFilter mIntentFilter;
ArrayAdapter<String> wifiP2pArrayAdapter;
ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_select_peer);
listView = findViewById(R.id.list_view);
wifiP2pArrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1);
listView.setAdapter(wifiP2pArrayAdapter);
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);
mManager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);
mChannel = mManager.initialize(this, getMainLooper(), null);
mReceiver = new WiFiDirectBroadcastReceiver(mManager, mChannel, this);
search();
}
public void search()
{
mManager.discoverPeers(mChannel, new WifiP2pManager.ActionListener() {
@Override
public void onSuccess() {
Toast.makeText(SelectPeerActivity.this, "SUCCESS", Toast.LENGTH_SHORT).show();
}
@Override
public void onFailure(int reasonCode) {
Toast.makeText(SelectPeerActivity.this, "FAILURE", Toast.LENGTH_SHORT).show();
}
});
}
public void displayPeers(WifiP2pDeviceList peerList)
{
wifiP2pArrayAdapter.clear();
for(WifiP2pDevice peer : peerList.getDeviceList())
wifiP2pArrayAdapter.add(peer.deviceName + "\n" + peer.deviceAddress);
}
/* register the broadcast receiver with the intent values to be matched */
@Override
protected void onResume() {
super.onResume();
registerReceiver(mReceiver, mIntentFilter);
}
/* unregister the broadcast receiver */
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(mReceiver);
}
}
这是我的broadcastreceiver的代码
package com.neeraj8le.majorproject;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.NetworkInfo;
import android.net.wifi.p2p.WifiP2pConfig;
import android.net.wifi.p2p.WifiP2pDevice;
import android.net.wifi.p2p.WifiP2pDeviceList;
import android.net.wifi.p2p.WifiP2pManager;
import android.util.Log;
import android.widget.Toast;
import com.neeraj8le.majorproject.activity.SelectPeerActivity;
import java.util.ArrayList;
import java.util.List;
public class WiFiDirectBroadcastReceiver extends BroadcastReceiver {
private static final String TAG = ":::::::::::::::::::::";
private WifiP2pManager mManager;
private WifiP2pManager.Channel mChannel;
private SelectPeerActivity mActivity;
List<WifiP2pDevice> mPeers;
List<WifiP2pConfig> mConfigs;
public WiFiDirectBroadcastReceiver(WifiP2pManager manager, WifiP2pManager.Channel channel, SelectPeerActivity activity) {
super();
this.mManager = manager;
this.mChannel = channel;
this.mActivity = activity;
}
@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(mActivity, "Wifi Direct Enabled", Toast.LENGTH_SHORT).show();
// Wifi P2P is enabled
} else {
Toast.makeText(mActivity, "Wifi Direct Disabled", Toast.LENGTH_SHORT).show();
// Wi-Fi P2P is not enabled
}
}
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()
mPeers = new ArrayList<>();
mConfigs = new ArrayList<>();
if (mManager != null) {
mManager.requestPeers(mChannel, new WifiP2pManager.PeerListListener() {
@Override
public void onPeersAvailable(WifiP2pDeviceList peerList) {
mPeers.clear();
mPeers.addAll(peerList.getDeviceList());
mActivity.displayPeers(peerList);
for (int i = 0; i < peerList.getDeviceList().size(); i++) {
WifiP2pConfig config = new WifiP2pConfig();
config.deviceAddress = mPeers.get(i).deviceAddress;
mConfigs.add(config);
}
}
});
}
if (mPeers.size() == 0) {
Log.d("::::::::::::::::::::::", "No devices found");
return;
}
}
else if (WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION.equals(action)) {
Log.d(TAG, "wifi p2p connection changed action");
NetworkInfo networkInfo = intent.getParcelableExtra(WifiP2pManager.EXTRA_NETWORK_INFO);
Log.d(TAG,"network info available");
// Respond to new connection or disconnections
} else if (WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION.equals(action)) {
// Respond to this device's wifi state
Log.d(TAG, "wifi p2p this device changed action");
// notifyDeviceUpdate();
WifiP2pDevice thisDevice = intent.getParcelableExtra(WifiP2pManager.EXTRA_WIFI_P2P_DEVICE);
Log.d(TAG,"this device acquired");
}
}
}
我从here
获得了大部分代码我调试了应用程序，除了
之外，所有3个意图过滤器都被触发了WIFI_P2P_PEERS_CHANGED_ACTION
我尝试在我的手机附近保留另一个Android设备以查看它是否检测到对等方并且一次ID确实触发了WIFI_P2P_PEERS_CHANGED_ACTION意图..但后来它说对等列表大小为0因此我无法找到对等方。
非常感谢任何有关此问题的帮助。
答案 0 :(得分：0)
我想问题是你试图发现的设备不是“可被发现的”。类似于WiFi P2P中的蓝牙发现，它也必须被启用，不幸的是它不像BT那样明确地发生。根据我的经验，为了能够发现其他设备，您必须：
这有点棘手，但我找不到任何其他解决方案。 Android WifiP2p的文档也没有提及它。请参阅我的answer，我在那里做了更多解释。
答案 1 :(得分：-1)
要能够通过直接Wi-Fi检测其他设备，必须激活每部手机上的位置。