Android WIFI Direct开发实例演示
实例 WIFIDirectDemo 改编 Android SDK 提供的实例,演示了通过 WIFI 搜寻连接点,建立连接,并进行数据传输的过程。
该实例包含 5 个类,说明说下:
该实例的运行效果如图 1 所示。
图 1 实例WIFIDirectDemo的运行效果
WIFIDirectDemo 的 AndroidManifest.xml 文件内容如下:
该实例包含 5 个类,说明说下:
- WIFIDirectDemoActivity:用于注册 BroadcastReceiver,处理 UI,并管理连接点的生命周期。
- WiFiDirectBroadcastReceiver:用于接收与 WIFI Direct 功能相关的 Intent。
- DeviceListFragment:用于显示可以连接点列表及其状态。
- FileTransferService:通过 TCP 协议在客户端与服务器之间进行文件传输的 IntentService。
- IntentService:Sevice 的子类,用于处理异步请求。
该实例的运行效果如图 1 所示。
图 1 实例WIFIDirectDemo的运行效果
WIFIDirectDemo 的 AndroidManifest.xml 文件内容如下:
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="introduction.android.wifidirectdemo"> <uses-sdk android:minSdkVersion="14" /> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /> <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" /> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.READ_CONTACTS" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <!--Market filtering --> <uses-feature android:name="android.hardware.wifi.direct" android:required="true" /> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".WIFIDirectDemoActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>WIFIDirectDemoActivity.java 的代码如下:
package introduction.android.wifidirectdemo; import android.app.Activity; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.net.wifi.p2p.WifiP2pConfig; import android.net.wifi.p2p.WifiP2pDevice; import android.net.wifi.p2p.WifiP2pManager; import android.net.wifi.p2p.WifiP2pManager.ActionListener; import android.net.wifi.p2p.WifiP2pManager.Channel; import android.net.wifi.p2p.WifiP2pManager.ChannelListener; import android.os.Bundle; import android.provider.Settings; import android.util.Log; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.Toast; public class WIFIDirectDemoActivity extends Activity implements ChannelListener, DeviceListFragment.WiFiPeerListAdapter.DeviceActionListener { public static final String TAG = "wifidirectdemo"; private WifiP2pManager manager; private boolean isWifiP2pEnabled = false; private boolean retryChannel = false; private final IntentFilter intentFilter = new IntentFilter(); private Channel channel; private BroadcastReceiver receiver = null; public void setIsWifiP2pEnabled(boolean isWifiP2pEnabled) { this.isWifiP2pEnabled = isWifiP2pEnabled; } public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // add necessary intent values to be matched. intentFilter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTI0N); intentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTI0N); intentFilter.addAction(WifiP2pManager.WIFI_P2P_C0NNECTI0N_CHANGED_ACTI0N); intentFilter.addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTI0N); manager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE); channel = manager.initialize(this, getMainLooper(), null); } /** * register the BroadcastReceiver with the intent values to be matched */ public void onResume() { super.onResume(); receiver = new WiFiDirectBroadcastReceiver(manager, channel, this); registerReceiver(receiver, intentFilter); } public void onPause() { super.onPause(); unregisterReceiver(receiver); } /* *Remove all peers and clear all fields.This is called on *BroadcastReceiver receiving a state change event. */ public void resetData() { DeviceListFragment fragmentList = (DeviceListFragment) getFragmentManager() .findFragmentById(R.id.frag_list); DeviceDetailFragment1 fragmentDetails = (DeviceDetailFragment1) getFragmentManager().findFragmentById(R.id.frag_detail); if (fragmentList != null) { fragmentList.clearPeers(); } if (fragmentDetails != null) { fragmentDetails.resetViews(); } } public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.action_items, menu); return true; } public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.atn_direct_enable: if (manager != null && channel != null) { startActivity(new Intent(Settings.ACTION_WIRELESS_SETTINGS)); } else { Log.e(TAG, "channel or manager is null"); } return true; case R.id.atn_direct_discover: if (!isWifiP2pEnabled) { Toast.makeText(WIFIDirectDemoActivity.this, R.string.p2p_off_warning, Toast.LENGTHJSHORT).show(); return true; } final DeviceListFragment fragment = (DeviceListFragment) getFragmentManager().findFragmentByld(R.id.frag_list); fragment.onInitiateDiscovery(); manager.discoverPeers(channel, new WifiP2pManager.ActionListener() { public void onSuccess() { Toast.makeText(WIFIDirectDemoActivity.this, "Discovery Initiated", Toast.LENGTH_SHORT).show(); } public void onFailure(int reasonCode) { Toast.makeText(WIFIDirectDemoActivity.this, "Discovery Failed " + reasonCode, Toast.LENGTH_SHORT).show(); } }); return true; default: return super.onOptionsItemSelected(item); } } public void showDetails(WifiP2pDevice device) { DeviceDetailFragmentl fragment = (DeviceDetailFragmentl) getFragmentManager().findFragmentById(R.id.frag_detail); fragment.showDetails(device); } public void connect(WifiP2pConfig config) { manager.connect(channel, config, new ActionListener() { public void onSuccess() { // WiFiDirectBroadcastReceiver will notify us. Ignore for now. } public void onFailure(int reason) { Toast.makeText(WIFIDirectDemoActivity.this, "Connect failed. Retry.", Toast.LENGTH_SHORT).show(); } }); } public void disconnect() { final DeviceDetailFragmentl fragment = (DeviceDetailFragmentl) getFragmentManager().findFragmentById(R.id.frag_detail); fragment.resetViews(); manager.removeGroup(channel, new ActionListener() { public void onFailure(int reasonCode) { Log.d(TAG, "Disconnect failed. Reason :" + reasonCode); } public void onSuccess() { fragment.getView().setVisibility(View.GONE); } }); } public void onChannelDisconnected() { 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(); } } public void cancelDisconnect() { if (manager != null) { final DeviceListFragment fragment = (DeviceListFragment) getFragmentManager().findFragmentById(R.id.frag_list); if (fragment.getDevice() == null || fragment.getDevice().status == WifiP2pDevice.CONNECTED) { disconnect(); } else if (fragment.getDevice().status == WifiP2pDevice.AVAILABLE || fragment.getDevice().status == WifiP2pDevice.INVITED) { manager.cancelConnect(channel, new ActionListener() { public void onSuccess() { Toast.makeText(WIFIDirectDemoActivity.this, "Aborting connection", Toast.LENGTH_SHORT).show(); } public void onFailure(int reasonCode) { Toast.makeText(WIFIDirectDemoActivity.this, "Connect abort request failed. Reason Code: " + reasonCode, Toast.LENGTH_SHORT).show(); } }); } } } }WiFiDirectBroadcastReceiver.java 的代码如下:
package introduction.android.wifidirectdemo; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.net.NetworkInfo; import android.net.wifi.p2p.WifiP2pDevice; import android.net.wifi.p2p.WifiP2pManager; import android.net.wifi.p2p.WifiP2pManager.Channel; import android.net.wifi.p2p.WifiP2pManager.PeerListListener; import android.util.Log; public class WiFiDirectBroadcastReceiver extends BroadcastReceiver { private WifiP2pManager manager; private Channel channel; private WIFIDirectDemoActivity activity; public WiFiDirectBroadcastReceiver(WifiP2pManager manager, Channel channel, WIFIDirectDemoActivity wifiDirectDemoActivity) { super(); this.manager = manager; this.channel = channel; this.activity = wifiDirectDemoActivity; } @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION.equals(action)) { // UI update to indicate wifi p2p status. int state = intent.getIntExtra(WifiP2pManager.EXTRA_WIFI_STATE, -1); if (state == WifiP2pManager.WIFI_P2P_STATE_ENABLED) { // Wifi Direct mode is enabled activity.setlsWifiP2pEnabled (true) ; } else { activity.setIsWifiP2pEnabled(false); activity.resetData(); } Log.d(WIFIDirectDemoActivity.TAG, "P2P state changed - " + state); } else if (WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION.equals(action)) { // 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, (PeerListListener) activity.getFragmentManager().findFragmentById(R.id.frag_list)); Log.d(WIFIDirectDemoActivity.TAG, "P2P peers changed"); } else if (WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION.equals(action)) { if (manager == null) { return; } NetworkInfo networkInfo = (NetworkInfo) intent .getParcelableExtra(WifiP2pManager.EXTRA_NETWORK_INFO); if (networkInfo.isConnected()) { // we are connected with the other device, request connection // info to find group owner IP DeviceDetailFragment1 fragment = (DeviceDetailFragmentl) activity.getFragmentManager().findFragmentById(R.id.frag_detail); manager.requestConnectionlnfo(channel, fragment); } else { // It's a disconnect activity.resetData(); } } else if (WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION.equals(action)){ DeviceListFragment fragment = (DeviceListFragment) activity.getFragmentManager() .findFragmentById(R.id.frag_list); fragment.updateThisDevice((WifiP2pDevice) intent.getParcelableExtra( WifiP2pManager.EXTRA_WIFI_P2P_DEVICE)); } } }DeviceListFragment.java 的代码如下:
package introduction.android.wifidirectdemo; import android.app.ListFragment; import android.app.ProgressDialog; import android.content.Context; import android.content.DialogInterface; import android.net.wifi.p2p.WifiP2pConfig; import android.net.wifi.p2p.WifiP2pDevice; import android.net.wifi.p2p.WifiP2pDeviceList; import android.net.wifi.p2p.WifiP2pManager.PeerListListener; import android.os.Bundle; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.TextView; import java.util.ArrayList; import java.util.List; public class DeviceListFragment extends ListFragment implements PeerListListener { private List<WifiP2pDevice> peers = new ArrayList<WifiP2pDevice>(); ProgressDialog progressDialog = null; View mContentView = null; private WifiP2pDevice device; @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); this.setListAdapter(new WiFiPeerListAdapter(getActivity(), R.layout.row_devices, peers)); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { mContentView = inflater.inflate(R.layout.device_list, null); return mContentView; } /* return this device */ public WifiP2pDevice getDevice() { return device; } private static String getDeviceStatus(int deviceStatus) { Log.d(WIFIDirectDemoActivity.TAG, "Peer status :" + deviceStatus); switch (deviceStatus) { case WifiP2pDevice.AVAILABLE: return "Available"; case WifiP2pDevice.INVITED: return "Invited"; case WifiP2pDevice.CONNECTED: return "Connected"; case WifiP2pDevice.FAILED: return "Failed"; case WifiP2pDevice.UNAVAILABLE: return "Unavailable"; default: return "Unknown"; } } /** * Initiate a connection with the peer. */ @Override public void onListItemClick(ListView l, View v, int position, long id) { WifiP2pDevice device = (WifiP2pDevice) getListAdapter().getItem(position); ((DeviceActionListener) getActivity()).showDetails(device); } /* Array adapter for ListFragment that maintains WifiP2pDevice list. */ public class WiFiPeerListAdapter extends ArrayAdapter<WifiP2pDevice> { private List<WifiP2pDevice> items; public WiFiPeerListAdapter(Context context, int textViewResourceId, List<WifiP2pDevice> objects) { super(context, textViewResourceId, objects); items = objects; } @Override public View getView(int position, View convertView, ViewGroup parent) { View v = convertView; if (v == null) { LayoutInflater vi = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE); v = vi.inflate(R.layout.row_devices, null); } WifiP2pDevice device = items.get(position); if (device != null) { TextView top = (TextView) v.findViewById(R.id.device_name); TextView bottom = (TextView) v.findViewById(R.id.device_details); if (top != null) { top.setText(device.deviceName); } if (bottom != null) { bottom.setText(getDeviceStatus(device.status)); } } return v; } public void updateThisDevice(WifiP2pDevice device) { this.device = device; TextView view = (TextView) mContentView.findViewById(R.id.my_name); view.setText(device.deviceName); view = (TextView) mContentView.findViewById(R.id.my_status); view.setText(getDeviceStatus(device.status)); } public void onPeersAvailable(WifiP2pDeviceList peerList) { if (progressDialog != null && progressDialog.isShowing()) { progressDialog.dismiss(); } peers.clear(); peers.addAll(peerList.getDeviceList()); ((WiFiPeerListAdapter) getListAdapter()).notifyDataSetChanged(); if (peers.size() == 0) { Log.d(WIFIDirectDemoActivity.TAG, "No devices found"); return; } } public void clearPeers() { peers.clear(); ((WiFiPeerListAdapter) getListAdapter()).notifyDataSetChanged(); } public void onInitiateDiscovery() { if (progressDialog != null && progressDialog.isShowing()) { progressDialog.dismiss(); } progressDialog = ProgressDialog.show(getActivity(), "Press back to cancel", true, true, new DialogInterface.OnCancelListener() { public void onCancel(DialogInterface dialog) { } }); } public interface DeviceActionListener { void showDetails(WifiP2pDevice device); void cancelDisconnect(); void connect(WifiP2pConfig config); void disconnect(); } } }FileTransferService.java 的代码如下:
package introduction.android.wifidirectdemo; import android.app.IntentService; import android.content.ContentResolver; import android.content.Context; import android.content.Intent; import android.net.Uri; import android.util.Log; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.InetSocketAddress; import java.net.Socket; public class FileTransferService extends IntentService { private static final int SOCKET_TIMEOUT = 5000; public static final String ACTION_SEND_FILE = "com.example.android.wifidirect.SEND_FILE" public static final String EXTRAS_FILE_PATH = "file_url"; public static final String EXTRAS_GROUP_OWNER_ADDRESS = "go_host"; public static final String EXTRAS_GROUP_OWNER_PORT = "go_port"; public FileTransferService(String name) { super(name); } public FileTransferService() { super("FileTransferService"); } @Override protected void onHandleIntent(Intent intent) { Context context = getApplicationContext(); if (intent.getAction().equals(ACTION_SEND_FILE)) { String fileUri = intent.getExtras().getString(EXTRAS_FILE_PATH); String host = intent.getExtras().getString(EXTRAS_GROUP_OWNER_ADDRESS); Socket socket = new Socket(); int port = intent.getExtras().getInt(EXTRAS_GROUP_OWNER_PORT); try { Log.d(WIFIDirectDemoActivity.TAG, "Opening client socket - "); socket.bind(null); socket.connect((new InetSocketAddress(host, port)), SOCKET_TIMEOUT); Log.d(WIFIDirectDemoActivity.TAG, "Client socket - " + socket.isConnected()) OutputStream stream = socket.getOutputStream(); ContentResolver cr = context.getContentResolver(); InputStream is = null; try { is = cr.openInputStream(Uri.parse(fileUri)); } catch (FileNotFoundException e) { Log.d(WIFIDirectDemoActivity.TAG, e.toString()); } DeviceDetailFragment1.copyFile(is, stream); Log.d(WIFIDirectDemoActivity.TAG, "Client: Data written"); } catch (IOException e) { Log.e(WIFIDirectDemoActivity.TAG, e.getMessage()); } finally { if (socket != null) { if (socket.isConnected()) { try { socket.close(); } catch (IOException e) { // Give up e.printStackTrace(); } } } } } } }
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