Android:如何监控 WiFi 信号强度

问题描述

当信号强度发生变化时，我会收到通知.我尝试创建以下方法并在 onCreate() 中调用它:

I would receive notifications when signal strength changes. I tried to create the following method and call it in the onCreate():

private void initializeWiFiListener(){
    Log.i(TAG, "executing initializeWiFiListener");

    String connectivity_context = Context.WIFI_SERVICE;
    final WifiManager wifi = (WifiManager)getSystemService(connectivity_context);

    if(!wifi.isWifiEnabled()){
        if(wifi.getWifiState() != WifiManager.WIFI_STATE_ENABLING){
            wifi.setWifiEnabled(true);
        }
    }

    registerReceiver(new BroadcastReceiver(){

        @Override
        public void onReceive(Context context, Intent intent) {
            WifiInfo info = wifi.getConnectionInfo();
            //TODO: implement methods for action handling
        }

    }, new IntentFilter(WifiManager.RSSI_CHANGED_ACTION));
}

如果有人可以检查该方法是否正确编写，我将不胜感激.我尝试运行该应用程序，但没有收到任何通知，并且不确定是因为我运行调试的地方信号强度可能是恒定的，还是因为缺少某些东西.

I would appreciate if anyone could check if the method is written correctly. I tried to run the app, but haven't received any notifications and am not sure whether it is because the signal strength might be constant in the place I run debug or it is because something is missing.

谢谢！

推荐答案

首先，确保您的清单中有 用于 ACCESS_WIFI_STATE.

First, make sure you have <uses-permission> for ACCESS_WIFI_STATE in your manifest.

其次，我不确定单个连接的通知，但要获得收音机看到的所有内容的通知，您可以开始扫描:

Second, I'm not sure about notifications for a single connection, but to get notifications of everything the radio is seeing, you can start a scan:

wifi.startScan();

接下来，当我收到成功的结果时，我在 IntentFilter 中使用了 WifiManager.SCAN_RESULTS_AVAILABLE_ACTION.

Next, when I've received successful results, I used WifiManager.SCAN_RESULTS_AVAILABLE_ACTION in the IntentFilter.

然后，在接收器中，我使用 WifiManager 对象中的 getScanResults()，该对象还包含信号强度.

Then, in the receiver, I use getScanResults() from the WifiManager object, which also contains the signal strength.

为了以这种方式停止它，您只需调用 unregisterRecever()(因此您需要保留它以供参考).我还没有测试过自己是否可以修改我的扫描代码以仅检查当前连接，但我知道我得到了很多结果——Wi-Fi 信号频繁且快速地变化.我想为了监视单个连接，您还可以过滤扫描结果并查找设备当前连接到的那个.

For stopping it this way, you simply call to unregisterRecever() (so you'll want to keep it around for referencing). I haven't tested myself to see if my scanning code can be modified to just check the current connection, but I do know I got plenty of results -- Wi-Fi signals change frequently and quickly. I suppose for monitoring a single connection, you can also just filter the scan results and look for the one the device is currently connected to.

我希望这会有所帮助.

这篇关于Android:如何监控 WiFi 信号强度的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！