我正在尝试通过WifiP2pManager访问Wifdirect功能，我试图在我的活动类中通过onPeersAvailable（）检索对等列表，但无法实现。请建议我如何检索和显示可用的对等点以及连接代码的位置。我的方法如下。
Log.d未在此方法中打印其值
@Override
public void onPeersAvailable(WifiP2pDeviceList peerList) {
if (progressDialog != null && progressDialog.isShowing()) {
progressDialog.dismiss();
}
peers.clear();
peers.addAll(peerList.getDeviceList());
Log.e("Peer Size-* * * *", String.valueOf(peers.size())+peerList.toString());
//((WiFiPeerListAdapter) getListAdapter()).notifyDataSetChanged();
if (peers.size() == 0) {
Log.d(MainActivity.TAG, "No devices found");
Log.e("Peer Size-","No Device Found * * * *");
return;
}
}
MainActivity
public class MainActivity extends AppCompatActivity implements WifiP2pManager.ChannelListener,WifiP2pManager.PeerListListener {
WifiP2pManager mManager;
WifiP2pManager.Channel mChannel;
BroadcastReceiver mReceiver;
IntentFilter mIntentFilter;
public static final String TAG = "MainActivity";
private List<WifiP2pDevice> peers = new ArrayList<WifiP2pDevice>();
ProgressDialog progressDialog = null;
View mContentView = null;
private WifiP2pDevice device;
private WifiP2pManager manager;
private boolean isWifiP2pEnabled = false;
private boolean retryChannel = false;
private final IntentFilter intentFilter = new IntentFilter();
TextView value;
/*
public void setIsWifiP2pEnabled(boolean isWifiP2pEnabled) {
this.isWifiP2pEnabled = isWifiP2pEnabled;
}
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
mManager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);
mChannel = mManager.initialize(this, getMainLooper(), null);
mReceiver = new WiFiDirectBroadcastReceiver(mManager, mChannel, this);
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);
}
@Override
protected void onResume() {
super.onResume();
registerReceiver(mReceiver, mIntentFilter);
}
/* unregister the broadcast receiver */
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(mReceiver);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
manager.discoverPeers(mChannel, new WifiP2pManager.ActionListener() {
@Override
public void onSuccess() {
Toast.makeText(MainActivity.this, "Discovery Initiated",
Toast.LENGTH_SHORT).show();
}
@Override
public void onFailure(int reasonCode) {
Toast.makeText(MainActivity.this, "Discovery Failed : " + reasonCode,
Toast.LENGTH_SHORT).show();
}
});
/*
Button clk = (Button) findViewById(R.id.showDetails);
clk.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//Toast.makeText(MainActivity.this, "Button Clicked", Toast.LENGTH_SHORT).show();
TextView view2 = (TextView) findViewById(R.id.value);
view2.setText(device.deviceAddress);
}
});
*/
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onPeersAvailable(WifiP2pDeviceList peerList) {
if (progressDialog != null && progressDialog.isShowing()) {
progressDialog.dismiss();
}
peers.clear();
peers.addAll(peerList.getDeviceList());
Log.e("Peer Size-* * * *", String.valueOf(peers.size())+peerList.toString());
//((WiFiPeerListAdapter) getListAdapter()).notifyDataSetChanged();
if (peers.size() == 0) {
Log.d(MainActivity.TAG, "No devices found");
Log.e("Peer Size-","No Device Found * * * *");
return;
}
}
@Override
public void onChannelDisconnected() {
// we will try once more
if (manager != null && !retryChannel) {
Toast.makeText(this, "Channel lost. Trying again", Toast.LENGTH_LONG).show();
// resetData();
retryChannel = true;
manager.initialize(this, getMainLooper(), this);
} else {
Toast.makeText(this,
"Severe! Channel is probably lost premanently. Try Disable/Re-Enable P2P.",
Toast.LENGTH_LONG).show();
}
}
}
这是广播接收器
public class WiFiDirectBroadcastReceiver extends BroadcastReceiver {
private WifiP2pManager mManager;
private WifiP2pManager.Channel mChannel;
private MainActivity mActivity;
WifiP2pManager.PeerListListener myPeerListListener;
private List<WifiP2pDevice> peers = new ArrayList<WifiP2pDevice>();
ProgressDialog progressDialog = null;
View mContentView = null;
private WifiP2pDevice device;
public WiFiDirectBroadcastReceiver(WifiP2pManager manager, WifiP2pManager.Channel channel,
MainActivity activity) {
super();
this.mManager = manager;
this.mChannel = channel;
this.mActivity = activity;
}
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
mManager.discoverPeers(mChannel, new WifiP2pManager.ActionListener() {
@Override
public void onSuccess() {
Toast.makeText(mActivity, "Channel Received", Toast.LENGTH_SHORT).show();
}
@Override
public void onFailure(int reasonCode) {
Toast.makeText(mActivity, "Channel Not Received", Toast.LENGTH_SHORT).show();
}
});
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) {
// Wifi Direct mode is enabled
//mActivity.setIsWifiP2pEnabled(true);
Log.e("WifiDIRECT-","Enabled");
} else {
//mActivity.setIsWifiP2pEnabled(false);
Log.e("WifiDIRECT-","Disabled");
// mActivity.resetData();
}
Log.d(MainActivity.TAG, "P2P state changed - " + state);
} else if (WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION.equals(action)) {
if (mManager != null) {
mManager.requestPeers(mChannel, myPeerListListener );
Log.e("Peer Changed:", "Detected Peer");
}
// Call WifiP2pManager.requestPeers() to get a list of current peers
} else if (WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION.equals(action)) {
// Respond to new connection or disconnections
if (mManager == null) {
return;
}
} else if (WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION.equals(action)) {
// Respond to this device's wifi state changing
}
}
}
答案 0 :(得分：3)
为什么您在discoverPeers WifiDirectBroadCastReceiver方法中呼叫onReceive？每次触发一个意图（您的discoverPeers已注册）时，它都不会继续调用BroadcastReceiver。
此外，这可能看起来很愚蠢，但是当您尝试查找它们时，是否还有其他设备正在运行discoverPeers。在Android中，只有确认您的设备是否启用了Wifi-Direct的确认方法是从中调用discoverPeers（或转到Settings->Wifi Settings->Wifi Direct-> Scan）。
因此，当这两个设备仅调用他们各自的discoverPeers时，他们会在peerList中找到onPeersAvailable {/ 1}}。