Android 4.0新增的WiFiDirect功能使用介绍
Android 4.0引入了一项很重要的技术就是 WiFiDirect (WiFi直连) ，它可以让WiFi设备无需热点即可实现两个WiFi设备的P2P数据交换。使用最新的Android 4.0 SDK，最低API Level 14才支持此项技术，在SDK的例子中我们可以看到很多界面用到了Android 3.0时代的Fragment容器。
首先我们需要实现android.net.wifi.p2p.WifiP2pManager.ChannelListener 接口来获取支持WiFi直连的Android设备。
public class WiFiDirectActivity extends Activityimplements ChannelListener, 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) { //设置一个标记是否启用WiFi直连 this.isWifiP2pEnabled = isWifiP2pEnabled; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //注册所需要处理的action，比如WiFi连接、状态改变等。 intentFilter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION); intentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION); intentFilter.addAction(WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION); intentFilter.addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION); manager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE); channel = manager.initialize(this, getMainLooper(), null); //实例化WifiP2pManager对象 } @Override public void onResume() { super.onResume(); receiver = new WiFiDirectBroadcastReceiver(manager, channel, this); registerReceiver(receiver, intentFilter); } @Override public void onPause() { super.onPause(); unregisterReceiver(receiver); } public void resetData() { DeviceListFragment fragmentList = (DeviceListFragment) getFragmentManager() .findFragmentById(R.id.frag_list); DeviceDetailFragment fragmentDetails = (DeviceDetailFragment) getFragmentManager() .findFragmentById(R.id.frag_detail); if (fragmentList != null) { fragmentList.clearPeers(); } if (fragmentDetails != null) { fragmentDetails.resetViews(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.action_items, menu); return true; } @Override 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(WiFiDirectActivity.this, R.string.p2p_off_warning, Toast.LENGTH_SHORT).show(); return true; } final DeviceListFragment fragment = (DeviceListFragment) getFragmentManager() .findFragmentById(R.id.frag_list); fragment.onInitiateDiscovery(); manager.discoverPeers(channel, new WifiP2pManager.ActionListener() { @Override public void onSuccess() { Toast.makeText(WiFiDirectActivity.this, "Discovery Initiated", Toast.LENGTH_SHORT).show(); } @Override public void onFailure(int reasonCode) { Toast.makeText(WiFiDirectActivity.this, "Discovery Failed : " + reasonCode, Toast.LENGTH_SHORT).show(); } }); return true; default: return super.onOptionsItemSelected(item); } } @Override public void showDetails(WifiP2pDevice device) { DeviceDetailFragment fragment = (DeviceDetailFragment) getFragmentManager() .findFragmentById(R.id.frag_detail); fragment.showDetails(device); } @Override public void connect(WifiP2pConfig config) { manager.connect(channel, config, new ActionListener() { @Override public void onSuccess() { // WiFiDirectBroadcastReceiver will notify us. Ignore for now. } @Override public void onFailure(int reason) { Toast.makeText(WiFiDirectActivity.this, "Connect failed. Retry.", Toast.LENGTH_SHORT).show(); } }); } @Override public void disconnect() { final DeviceDetailFragment fragment = (DeviceDetailFragment) getFragmentManager() .findFragmentById(R.id.frag_detail); fragment.resetViews(); manager.removeGroup(channel, new ActionListener() { @Override public void onFailure(int reasonCode) { Log.d(TAG, "Disconnect failed. Reason :" + reasonCode); } @Override public void onSuccess() { fragment.getView().setVisibility(View.GONE); } }); } @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(); } } @Override 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() { @Override public void onSuccess() { Toast.makeText(WiFiDirectActivity.this, "Aborting connection", Toast.LENGTH_SHORT).show(); } @Override public void onFailure(int reasonCode) { Toast.makeText(WiFiDirectActivity.this, "Connect abort request failed. Reason Code: " + reasonCode, Toast.LENGTH_SHORT).show(); } }); } } } }
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