廣播接收器：爲什麼它不起作用？

我有這個廣播接收器獲取並保持有關電池的最新信息。有關電池的信息很好地工作，在無需重新創建活動的情況下進行更新，而WiFi沒有。例如，如果我禁用WiFi，則不會更改首選項摘要（並且應該）。爲什麼？我該如何解決？這是代碼。廣播接收器：爲什麼它不起作用？

@Override 
protected void onStop() 
{ 
    unregisterReceiver(batteryInfoReceiver); 
    super.onStop(); 
} 

@Override 
protected void onRestart() 
{ 
    this.registerReceiver(this.batteryInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED)); 
    super.onRestart(); 
} 

private BroadcastReceiver batteryInfoReceiver = new BroadcastReceiver() { 
    @Override 
    public void onReceive(Context context, Intent intent) { 

     WifiManager wifiMgr = (WifiManager) getSystemService(WIFI_SERVICE); 
     WifiInfo wifiInfo = wifiMgr.getConnectionInfo(); 

    int level= intent.getIntExtra(BatteryManager.EXTRA_LEVEL,0); 
    String technology= intent.getExtras().getString(BatteryManager.EXTRA_TECHNOLOGY); 
    int temperature= intent.getIntExtra(BatteryManager.EXTRA_TEMPERATURE,0)/10; 
    int voltage= intent.getIntExtra(BatteryManager.EXTRA_VOLTAGE,0); 

    int chargePlug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1); 
    boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB; 
    boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC; 
    if (sdkVersion < Build.VERSION_CODES.JELLY_BEAN_MR1) { 
     boolean wCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_WIRELESS; 

     if(wCharge) { 
      ricarica.setSummary("Charging (WiFi)"); 
     } 
    } 

    if(usbCharge) { 
     ricarica.setSummary("Charging (USB)"); 
    } 
    else if (acCharge){ 
     ricarica.setSummary("Charging (AC)"); 
    } 

    else { 
     ricarica.setSummary("Not charging"); 
    } 

    livelloBatteria.setSummary("Battery at "+level+"%"); 
    livelloVoltaggio.setSummary(voltage+" mV"); 
    livelloTemperatura.setSummary(Integer.toString(temperature)+"° Celsius"); 
    tecnologia.setSummary(technology); 

    int ip = wifiInfo.getIpAddress(); 
    int speed = wifiInfo.getLinkSpeed(); 
    String speedString = Integer.toString(speed); 
    String mac = wifiInfo.getMacAddress(); 
    String ssid = wifiInfo.getSSID(); 
    String ipAddress = Formatter.formatIpAddress(ip); 

    if (wifiMgr.isWifiEnabled()){ 

    if(mac!=null) { 
     indirizzoMac.setSummary(mac); 
    } 
    else { 
     indirizzoMac.setSummary("Unkown"); 
    } 

    if(ipAddress!=null) { 
    indirizzoIp.setSummary(ipAddress); 
    } 
    else { 
     indirizzoIp.setSummary("Unkown"); 
    } 

    if(ssid!=null) { 
     indirizzoSsid.setSummary(ssid); 
    } 
    else { 
     indirizzoSsid.setSummary("Unkown"); 
    } 

    if(speedString!=null) { 
     velocità.setSummary(speedString+" Mbps"); 
    } 

    else { 
     velocità.setSummary("Unkown"); 
    } 

    } 

    else { 
     indirizzoIp.setSummary("WiFi disabled"); 
     indirizzoSsid.setSummary("WiFi disabled"); 
     velocità.setSummary("WIFi disabled"); 
     indirizzoMac.setSummary(mac); 
    } 
    } 
    };

來源

2013-12-08 Mario G.

您可以發佈清單嗎？你有沒有正確設置意圖過濾器捕獲連接事件？ – SuppressWarnings

你已經在Manifest中用正確的意圖過濾器註冊了您的BroadcastReceiver？ –

我覺得你的接收機沒有被註冊爲WiFi連接的改變嘗試添加另一個過濾器到它：

IntentFilter filter= new IntentFilter(); 
filter.addAction(Intent.ACTION_BATTERY_CHANGED); 
filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION); 
this.registerReceiver(this.batteryInfoReceiver,filter);

您還可以添加連接變化行動進行過濾，使您的onReceive將被調用，如果網絡連接更改：

filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);

來源

2013-12-08 08:33:01

它的作品，但現在我有一個問題。當我禁用和啓用後，我的首選項WiFi讀取，IP地址0.0.0.0和速度-1 Mbps。爲什麼以及如何解決這個問題？ –

廣播接收器：爲什麼它不起作用？

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