Android：如何监控 WiFi 信号强度
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/1206891/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Android: How to monitor WiFi signal strength
提问by Niko Gamulin
I would receive notifications when signal strength changes. I tried to create the following method and call it in the onCreate():
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：
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));
}
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.
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，我不确定这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。
Thanks!
谢谢！
采纳答案by lilbyrdie
First, make sure you have <uses-permission>for ACCESS_WIFI_STATEin your manifest.
首先，确保您的清单中有<uses-permission>for ACCESS_WIFI_STATE。
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:
其次，我不确定单个连接的通知，但要获取收音机看到的所有内容的通知，您可以开始扫描：
wifi.startScan();
Next, when I've received successful results, I used WifiManager.SCAN_RESULTS_AVAILABLE_ACTIONin the IntentFilter.
接下来，当我收到成功的结果时，我WifiManager.SCAN_RESULTS_AVAILABLE_ACTION在IntentFilter.
Then, in the receiver, I use getScanResults()from the WifiManagerobject, which also contains the signal strength.
然后，在接收器中，我使用getScanResults()fromWifiManager对象，其中还包含信号强度。
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.
要以这种方式停止它，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。
I hope this helps a little.
希望这会有帮助。
回答by sschrass
Just to drop my solution:
只是为了放弃我的解决方案：
in my App I have
在我的应用程序中，我有
@Override
protected void onResume() {
super.onResume();
networkStateReceiver = new NetworkStateReceiver(this);
this.registerReceiver(networkStateReceiver, new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE"));
this.registerReceiver(networkStateReceiver, new IntentFilter("android.net.wifi.SCAN_RESULTS"));
networkStateReceiver.registerListener(this);
}
And the onReceive in my Receiver looks like:
我的接收器中的 onReceive 看起来像：
@Override
public void onReceive(Context context, Intent intent) {
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnectedOrConnecting()) {
switch (networkInfo.getType()) {
case ConnectivityManager.TYPE_ETHERNET:
this.networkStateMessage = new NetworkStateMessage(networkInfo);
break;
case ConnectivityManager.TYPE_WIFI:
this.networkStateMessage = new NetworkStateMessage(networkInfo, wifiManager.getConnectionInfo());
worker.schedule(new Runnable() {
@Override
public void run() { wifiManager.startScan(); }
}, 5, TimeUnit.SECONDS);
break;
default:
this.networkStateMessage = null;
break;
}
}
notifyStateToAll(this.networkStateMessage);
}
The idea is the to startScan()only every 5 seconds if the wifi is the active network.
startScan()如果 wifi 是活动网络，这个想法是每 5 秒一次。
