我的应用程序的部分功能是扫描并显示 WiFi 接入点列表,然后连接到用户选择的接入点。我有这个功能工作。现在,我还希望在连接“通过”时得到通知。这应该很简单,但我发现自己绊倒了。
我已经阅读了 SO 这里的各种帖子,它们都提到注册WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION
or WifiManager.WIFI_STATE_CHANGED_ACTION
。但是,这些都不适合我。任何人都可以在此代码中发现任何错误吗?(我省略了进行扫描的部分)
预期行为:一旦连接成功(即,当我在通知栏上看到“已连接”图标时),应该会收到广播并且应该看到 toast。
观察到的行为:当应用程序第一次启动时接收到广播,每当我切换回它时(即,每当onResume()
被调用;或者我怀疑,每当我注册意图时)
public class WifiScanActivity extends Activity {
WifiManager mainWifi;
WifiReceiver mWifiReceiver;
IntentFilter mIntentFilter;
private final static String TAG = "WifiScanActivity";
public static final String INTENT_FOR_WIFI_CONNECTED =
WifiManager.WIFI_STATE_CHANGED_ACTION;
// public static final String INTENT_FOR_WIFI_CONNECTED =
// WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mainWifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
mWifiReceiver = new WifiReceiver();
mIntentFilter = new IntentFilter();
mIntentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
mIntentFilter.addAction(INTENT_FOR_WIFI_CONNECTED);
registerReceiver(mWifiReceiver, mIntentFilter);
mainWifi.startScan();
}
protected void onPause() {
unregisterReceiver(mWifiReceiver);
super.onPause();
}
protected void onResume() {
registerReceiver(mWifiReceiver, mIntentFilter);
super.onResume();
}
class WifiReceiver extends BroadcastReceiver {
public void onReceive(Context c, Intent intent) {
Log.d(TAG,
"In WifiReceiver: Broadcast Received = " + intent.getAction());
if (WifiManager.SCAN_RESULTS_AVAILABLE_ACTION.equals(intent
.getAction())) {
// Display the ListView and connect to the selected AP
} else if (INTENT_FOR_WIFI_CONNECTED.equals(intent.getAction())) {
if (WifiManager.WIFI_STATE_ENABLED == intent.getIntExtra(
WifiManager.EXTRA_WIFI_STATE, 0)) {
displayNetworkInfo();
}
/*if(true == intent.getBooleanExtra(
* WifiManager.EXTRA_SUPPLICANT_CONNECTED, false)){
* displayNetworkInfo();
}*/
}
}
}
private void displayNetworkInfo() {
WifiInfo wifiInfo = mainWifi.getConnectionInfo();
String ssid = wifiInfo.getSSID();
int ip = wifiInfo.getIpAddress();
String message = "Connection established.\nSSID = " + ssid
+ "; IP Address = " + Helper.displayIpAddress(ip);
Log.d(TAG, message);
Toast.makeText(this, message, Toast.LENGTH_LONG).show();
}
}
如果我取消注释 WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION 的代码,我根本看不到正在接收广播。
注意:我知道连接成功,因为我在 Android 的 wifi 设置屏幕中看到了状态。