Question

我有这个广播接收器，可以获取并保持有关电池的最新信息。有关电池的信息很好，从某种意义上说，它们是更新而无需重新创建活动，而WiFi没有。例如，如果我禁用WiFi，则不会更改“首选项摘要”（并且应该）。为什么？我该怎么办？这是代码。

@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);
    }
    }
    };

Answer 1

我认为你的接收器没有注册wifi连接更改尝试添加另一个过滤器：

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

您还可以添加连接更改操作进行过滤，以便在网络连接发生变化时调用onReceive：

filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);

广播接收器：为什么它不起作用？

1 个答案: