在Android中,Wi-Fi编程主要涉及到两个方面:连接和管理Wi-Fi网络。以下是一个简单的示例,展示了如何在Android中进行Wi-Fi编程:
WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
if (wifiManager.isWifiEnabled()) {
// Wi-Fi已启用
} else {
// Wi-Fi未启用
}
WifiConfiguration wifiConfig = new WifiConfiguration();
wifiConfig.SSID = "\"" + ssid + "\"";
wifiConfig.preSharedKey = "\"" + password + "\"";
wifiManager.disconnect();
int networkId = wifiManager.addNetwork(wifiConfig);
wifiManager.enableNetwork(networkId, true);
wifiManager.reconnect();
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
if (wifiInfo != null) {
String ssid = wifiInfo.getSSID();
String bssid = wifiInfo.getBSSID();
int rssi = wifiInfo.getRssi();
int linkSpeed = wifiInfo.getLinkSpeed();
int networkId = wifiInfo.getNetworkId();
}
wifiManager.startScan();
List<ScanResult> scanResults = wifiManager.getScanResults();
for (ScanResult scanResult : scanResults) {
String ssid = scanResult.SSID;
String bssid = scanResult.BSSID;
int level = scanResult.level;
int frequency = scanResult.frequency;
}
BroadcastReceiver wifiReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_UNKNOWN);
switch (wifiState) {
case WifiManager.WIFI_STATE_ENABLED:
// Wi-Fi已启用
break;
case WifiManager.WIFI_STATE_DISABLED:
// Wi-Fi已禁用
break;
}
}
};
IntentFilter intentFilter = new IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION);
registerReceiver(wifiReceiver, intentFilter);
BroadcastReceiver networkReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
NetworkInfo networkInfo = intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
if (networkInfo.isConnected()) {
// 已连接到Wi-Fi网络
} else {
// 未连接到Wi-Fi网络
}
}
}
};
IntentFilter intentFilter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(networkReceiver, intentFilter);
在进行Wi-Fi编程时,需要注意以下几点:
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-feature android:name="android.hardware.wifi" />
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