Android实时监控4G手机网络信号强度

    public  void getPhoneState(Context context) {
        final TelephonyManager telephonyManager = (TelephonyManager)     context.getSystemService(Context.TELEPHONY_SERVICE);
        PhoneStateListener MyPhoneListener = new PhoneStateListener() {
            @Override
            //获取对应网络的ID，这个方法在这个程序中没什么用处
            public void onCellLocationChanged(CellLocation location) {
                if (location instanceof GsmCellLocation) {
                    int CID = ((GsmCellLocation) location).getCid();
                } else if (location instanceof CdmaCellLocation) {
                    int ID = ((CdmaCellLocation) location).getBaseStationId();
                }
            }
            //系统自带的服务监听器，实时监听网络状态
            @Override
            public void onServiceStateChanged(ServiceState serviceState) {
                super.onServiceStateChanged(serviceState);
            }
            //这个是我们的主角，就是获取对应网络信号强度
            @Override
            public void onSignalStrengthsChanged(SignalStrength signalStrength) {
                //这个ltedbm 是4G信号的值
                String signalinfo = signalStrength.toString();
                String[] parts = signalinfo.split(" ");
                int ltedbm = Integer.parseInt(parts[9]);
                //这个dbm 是2G和3G信号的值
                int asu = signalStrength.getGsmSignalStrength();
                int dbm = -113 + 2 * asu;

                if (telephonyManager.getNetworkType() == TelephonyManager.NETWORK_TYPE_LTE) {
                    Log.d("NetWorkUtil", "网络：LTE 信号强度：" + ltedbm + "======Detail:" + signalinfo);
                } else if (telephonyManager.getNetworkType() == TelephonyManager.NETWORK_TYPE_HSDPA ||
                        telephonyManager.getNetworkType() == TelephonyManager.NETWORK_TYPE_HSPA ||
                        telephonyManager.getNetworkType() == TelephonyManager.NETWORK_TYPE_HSUPA ||
                        telephonyManager.getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS)                                               {
                    String bin;
                    if (dbm > -75) {
                        bin = "网络很好";
                    } else if (dbm > -85) {
                        bin = "网络不错";
                    } else if (dbm > -95) {
                        bin = "网络还行";
                    } else if (dbm > -100) {
                        bin = "网络很差";
                    } else {
                        bin = "网络错误";
                    }
                    Log.d("NetWorkUtil", "网络：WCDMA 信号值：" + dbm + "========强度：" + bin + "======Detail:" + signalinfo);
                } else {
                    String bin;
                    if (asu < 0 || asu >= 99) bin = "网络错误";
                    else if (asu >= 16) bin = "网络很好";
                    else if (asu >= 8) bin = "网络不错";
                    else if (asu >= 4) bin = "网络还行";
                    else bin = "网络很差";
                    Log.d("NetWorkUtil", "网络：GSM 信号值：" + dbm + "========强度：" + bin + "======Detail:" + signalinfo);
                }
                super.onSignalStrengthsChanged(signalStrength);
            }
        };
        telephonyManager.listen(MyPhoneListener, PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);
    }