连接到WiFi接入点时未收到WIFI_STATE_CHANGED_ACTION意图？

Question

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,我也希望在连接"通过"时收到通知.这应该相当简单,但我发现自己磕磕绊绊.

我在SO阅读了各种帖子,他们都提到了注册WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION或WifiManager.WIFI_STATE_CHANGED_ACTION.但是,这些都不适合我.谁能发现这段代码中的任何错误？(我要省略扫描和东西的部分)

预期的行为:一旦连接成功(即,当我看到通知栏上的"已连接"图标)时,应该收到广播,我应该看到祝酒词.

观察到的行为:当应用程序首次启动时收到广播,每当我切换回它时(即,无论何时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.

Answer 1

好的,我明白了.事实证明我正在注册错误的意图.我应该用 WifiManager.NETWORK_STATE_CHANGED_ACTION.

以下是代码相关部分的摘要:

mIntentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION) ;
mIntentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);


public void onReceive(Context c, Intent intent) {

if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(intent.getAction())) {

    NetworkInfo nwInfo = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
    if(NetworkInfo.State.CONNECTED.equals(nwInfo.getState())){//This implies the WiFi connection is through
        displayNetworkInfo();
    }
}