Android官方提供了WiFi-Direct的API和示例代码。以下是实现WiFi-Direct连接的代码示例：

声明WiFi-Direct：

WifiP2pManager mManager;
WifiP2pManager.Channel mChannel;

将上述代码添加到您的类中并实现以下方法：

在onCreate方法中：

mManager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);
mChannel = mManager.initialize(this, getMainLooper(), null);

初始化peers列表：

WifiP2pManager.PeerListListener peerListListener = new WifiP2pManager.PeerListListener() {
  @Override
  public void onPeersAvailable(WifiP2pDeviceList peerList) {
    // 检查WiFi-Direct对等列表是否更改
    if (progressDialog != null && progressDialog.isShowing()) {
      progressDialog.dismiss();
    }
    peers.clear();
    peers.addAll(peerList.getDeviceList());
    // 显示设备的名称
    DeviceNameListAdapter adapter = new DeviceNameListAdapter(MainActivity.this, peers);
    listView.setAdapter(adapter);
    if (peers.size() == 0) {
      return;
    }
  }
}

搜索设备：

mManager.discoverPeers(mChannel, new WifiP2pManager.ActionListener() {
  @Override
  public void onSuccess() {
    // 成功开始发现设备
    progressDialog = ProgressDialog.show(MainActivity.this, "Press back to cancel", "Finding peers", true, true);
  }

  @Override
  public void onFailure(int reasonCode) {
    // 发现设备失败，错误码说明
    Toast.makeText(MainActivity.this, R.string.search_fail, Toast.LENGTH_SHORT).show();
  }
});

连接设备：

// 根据您选择的设备提供下面的WiFi-Direct设备地址
WifiP2pConfig config = new WifiP2pConfig();
config.deviceAddress = device.deviceAddress;
mManager.connect(mChannel, config, new WifiP2pManager.ActionListener() {
  @Override
  public void onSuccess() {
    Toast.makeText(MainActivity.this, R.string.connect_ok, Toast