android - 广播接收器未检测到丢失的 wifi 连接

Question

我在检测 wifi 变化时遇到了一些问题。我希望我的应用程序能够监控 wifi 网络并在 wifi 断开连接时创建一个警报对话框。在启动、恢复等时或 b。任何时候连接丢失。这是我的代码(我使用 this.registerReceiver(wifiStatusReceiver, new IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION)) 在 onResume 中注册它)；并在 onPause 中注销它:

 BroadcastReceiver wifiStatusReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        int extraWifiState = intent.getIntExtra(
                WifiManager.EXTRA_WIFI_STATE,
                WifiManager.WIFI_STATE_UNKNOWN);

        final String action = intent.getAction();

        DialogFragment dialog = (DialogFragment) fragmentManager
                .findFragmentByTag(WifiAlertDialogFragment.DIALOG_WIFI);

        if (action.equals(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION)) {
            NetworkInfo info = (NetworkInfo) intent
                    .getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
            if (info.getState().equals(NetworkInfo.State.CONNECTED)) {
                logger.d("wifi changed, is still connected");
                if (dialog != null)
                    dialog.dismiss();
            } else {
                logger.d("connection lost");
                if (dialog == null)
                    WifiAlertDialogFragment.wifiCheck(HomeActivity.this);
            }
        }

        switch (extraWifiState) {

        case WifiManager.WIFI_STATE_DISABLED:
            WifiAlertDialogFragment.wifiCheck(HomeActivity.this);
            break;
        case WifiManager.WIFI_STATE_DISABLING:
            Toast.makeText(HomeActivity.this, R.string.wifi_disabled,
                    Toast.LENGTH_SHORT).show();
            WifiAlertDialogFragment.wifiCheck(HomeActivity.this);
            break;
        case WifiManager.WIFI_STATE_ENABLED:
            if (dialog != null)
                dialog.dismiss();
            break;
        case WifiManager.WIFI_STATE_ENABLING:
            if (dialog != null)
                dialog.dismiss();
            Toast.makeText(HomeActivity.this, "Wifi Enabling",
                    Toast.LENGTH_LONG).show();
            break;
        case WifiManager.WIFI_STATE_UNKNOWN:
            // no op
            break;
        }
    }
};

Answer 1

更新:我发现了问题，所以我会自己回答这个问题。我只使用 SUPPLICANT_STATE_CHANGED_ACTION 因为它正在检查任何 wifi 状态——断开连接、禁用、连接、启用等。另一个对监视连接毫无用处，因为它只检查用户是否在设置中启用了 wifi还是不是。

注册我的接收器(在 onResume 中):

    IntentFilter filter = new IntentFilter(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
    this.registerReceiver(wifiStatusReceiver, filter);

我的新代码如下所示:

BroadcastReceiver wifiStatusReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        logger.d("checking wifi state...");
        SupplicantState supState;
        WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
        supState = wifiInfo.getSupplicantState();
        logger.d("supplicant state: " + supState);

        SherlockDialogFragment dialog = (SherlockDialogFragment) fragmentManager
                .findFragmentByTag(WifiAlertDialogFragment.DIALOG_WIFI);

        if (supState.equals(SupplicantState.COMPLETED)) {
            logger.d("wifi enabled and connected");
            if (dialog != null)
                dialog.dismiss();
        } else {
            WifiAlertDialogFragment.wifiCheck(HomeActivity.this);
            if (supState.equals(SupplicantState.SCANNING)) {
                logger.d("wifi scanning");
            } else if (supState.equals(SupplicantState.DISCONNECTED)) {
                logger.d("wifi disonnected");
            } else {
                Toast.makeText(HomeActivity.this, "Wifi Enabling",
                        Toast.LENGTH_LONG).show();
                logger.d("wifi connecting");
            }
        }
    }
};