Android check Wi-Fi Direct已开通

WifiP2pManager manager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);

WifiP2pManager.Channel channel = manager.initialize(this, getMainLooper(), null);
WifiDirectBroadcastReceiver receiver = new WifiDirectBroadcastReceiver(manager, channel);
IntentFilter filter = new IntentFilter();
filter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION);
registerReceiver(receiver, filter);

@Override
public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();
    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) {
            // Wi-Fi Direct已开通
            // 执行相应操作
        } else {
            // Wi-Fi Direct未开通
            // 执行相应操作
        }
    }
}