Question

我在检测wifi的变化时遇到了一些麻烦。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，恢复等等或b。任何时候连接丢失。这是我的代码（我在onResume中使用this.registerReceiver（wifiStatusReceiver，新的IntentFilter（WifiManager.WIFI_STATE_CHANGED_ACTION））注册它;并在onPause中取消注册它：

 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。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。另一个用于监控连接是没有用的，因为它只检查用户是否在设置中启用了wifi或不。

注册我的接收者（在onResume中）：

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

我的新代码如下：

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");
            }
        }
    }
};

广播接收器未检测到丢失的WiFi连接

1 个答案: