Android获取手机信号强度汇总

    雪里香梅，先报春来早。——（宋）欧阳修《蝶恋花》

    如今的天气是越来略冷了，每每走在凛冽的寒风中，心里就一个想法，春（假）天（期）怎么还不到！不知道大家有没有同感。前两天要做一个获取手机信号的小程序，于是在网上搜索了很多，就找到两种方法，遗憾的是都没跑通。正当本人山重水复疑无路之时，看到了第三种方法，赶紧试了一下——噢耶\(^o^)/成功啦！于是把这三种方法都整理下来和大家分享一下！

    首先，获取有关手机信号的信息是需要获取权限的，这里介绍动态申请权限的方法。列出所需权限：

private String[] permissions =
 {Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.ACCESS_WIFI_STATE,Manifest.permission.CHANGE_NETWORK_STATE,Manifest.permission.ACCESS_COARSE_LOCATION,Manifest.permission.READ_PHONE_STATE，Manifest.permission.ACCESS_NETWORK_STATE,Manifest.permission.MODIFY_PHONE_STATE};

    申请权限：

for (int j = 0;j < permissions.length; j++){
    int i = ContextCompat.checkSelfPermission(this, permissions[j]);
    // 权限是否已经 授权 GRANTED---授权  DINIED---拒绝
    if (i != PackageManager.PERMISSION_GRANTED) {
        // 如果没有授予该权限，就去提示用户请求
        ActivityCompat.requestPermissions(this, permissions, 321);
    }
}

    第一种方法：

    public void getCurrentNetDBM(Context context) {
        final TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
        PhoneStateListener mylistener = new PhoneStateListener() {
            @Override
            public void onSignalStrengthsChanged(SignalStrength signalStrength) {
                super.onSignalStrengthsChanged(signalStrength);
                String signalInfo = signalStrength.toString();
                String[] params = signalInfo.split(" ");
                if (tm.getNetworkType() == TelephonyManager.NETWORK_TYPE_LTE) {
                    //4G网络 最佳范围 >-90dBm 越大越好
                    int Itedbm = Integer.parseInt(params[9]);
                    Log.e("66666", "onSignalStrengthsChanged: " + Itedbm + "");
                } else if (tm.getNetworkType() == TelephonyManager.NETWORK_TYPE_HSDPA ||
                        tm.getNetworkType() == TelephonyManager.NETWORK_TYPE_HSPA ||
                        tm.getNetworkType() == TelephonyManager.NETWORK_TYPE_HSUPA ||
                        tm.getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS) {
                    //3G网络最佳范围  >-90dBm  越大越好  ps:中国移动3G获取不到  返回的无效dbm值是正数（85dbm）
                    //在这个范围的已经确定是3G，但不同运营商的3G有不同的获取方法，故在此需做判断 判断运营商与网络类型的工具类在最下方
                    String yys = NetUtils.getOperatorName(getApplication());//获取当前运营商
                    if (yys == "中国移动") {
                        Log.e("66666", "onSignalStrengthsChanged: " + 0 + "");//中国移动3G不可获取，故在此返回0
                    } else if (yys == "中国联通") {
                        int cdmaDbm = signalStrength.getCdmaDbm();
                        Log.e("66666", "onSignalStrengthsChanged: " + cdmaDbm + "");
                    } else if (yys == "中国电信") {
                        int evdoDbm = signalStrength.getEvdoDbm();
                        Log.e("66666", "onSignalStrengthsChanged: " + evdoDbm + "");
                    }
                } else {
                    //2G网络最佳范围>-90dBm 越大越好
                    int asu = signalStrength.getGsmSignalStrength();
                    int dbm = -113 + 2 * asu;
                    Log.e("66666", "onSignalStrengthsChanged: " + dbm + "");
                }
            }
        };
        //开始监听
        tm.listen(mylistener, PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);
    }

    经实验，这种方法虽然可以触发onSignalStrengthsChanged()方法，但是获取的信号强度一直是-1（实验信号为北京联通4G），显然不符合实际。

    第二种方法：

    public void signal() {
        List<NeighboringCellInfo> infos;
        TelephonyManager mTelephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        infos = mTelephonyManager.getNeighboringCellInfo();
        StringBuffer sb = new StringBuffer("总数 : " + infos.size() + "\n");
        for (NeighboringCellInfo info1 : infos) { // 根据邻区总数进行循环
            sb.append(" LAC : " + info1.getLac()); // 取出当前邻区的LAC
            sb.append(" CID : " + info1.getCid()); // 取出当前邻区的CID
            sb.append(" BSSS : " + (-113 + 2 * info1.getRssi()) + "\n"); // 获取邻区基站信号强度
        }
        Log.e("66666", " 获取邻区基站信息:" + sb.toString());
    }

    这种方法看起来是可行的，但在实际实验过程中getNeighboringCellInfo()方法的返回值一直为null，查阅相关资料有人说是Google API的问题，期待着修复吧。

    第三种方法，也是我找到的唯一可行的办法：

    public void getMobileDbm()
    {
        int dbm = -1;
        TelephonyManager tm = (TelephonyManager)this.getSystemService(Context.TELEPHONY_SERVICE);
        List<CellInfo> cellInfoList = tm.getAllCellInfo();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1)
        {
            if (null != cellInfoList)
            {
                for (CellInfo cellInfo : cellInfoList)
                {
                    if (cellInfo instanceof CellInfoGsm)
                    {
                        CellSignalStrengthGsm cellSignalStrengthGsm = ((CellInfoGsm)cellInfo).getCellSignalStrength();
                        dbm = cellSignalStrengthGsm.getDbm();
                        Log.e("66666", "cellSignalStrengthGsm" + cellSignalStrengthGsm.toString());
                    }
                    else if (cellInfo instanceof CellInfoCdma)
                    {
                        CellSignalStrengthCdma cellSignalStrengthCdma = ((CellInfoCdma)cellInfo).getCellSignalStrength();
                        dbm = cellSignalStrengthCdma.getDbm();
                        Log.e("66666", "cellSignalStrengthCdma" + cellSignalStrengthCdma.toString() );
                    }
                    else if (cellInfo instanceof CellInfoWcdma)
                    {
                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2)
                        {
                            CellSignalStrengthWcdma cellSignalStrengthWcdma = ((CellInfoWcdma)cellInfo).getCellSignalStrength();
                            dbm = cellSignalStrengthWcdma.getDbm();
                            Log.e("66666", "cellSignalStrengthWcdma" + cellSignalStrengthWcdma.toString() );
                        }
                    }
                    else if (cellInfo instanceof CellInfoLte)
                    {
                        CellSignalStrengthLte cellSignalStrengthLte = ((CellInfoLte)cellInfo).getCellSignalStrength();
                        dbm = cellSignalStrengthLte.getDbm();
                        Log.e("66666", "cellSignalStrengthLte.getAsuLevel()\t" + cellSignalStrengthLte.getAsuLevel() );
                        Log.e("66666", "cellSignalStrengthLte.getCqi()\t" + cellSignalStrengthLte.getCqi() );
                        Log.e("66666", "cellSignalStrengthLte.getDbm()\t " + cellSignalStrengthLte.getDbm() );
                        Log.e("66666", "cellSignalStrengthLte.getLevel()\t " + cellSignalStrengthLte.getLevel() );
                        Log.e("66666", "cellSignalStrengthLte.getRsrp()\t " + cellSignalStrengthLte.getRsrp() );
                        Log.e("66666", "cellSignalStrengthLte.getRsrq()\t " + cellSignalStrengthLte.getRsrq() );
                        Log.e("66666", "cellSignalStrengthLte.getRssnr()\t " + cellSignalStrengthLte.getRssnr() );
                        Log.e("66666", "cellSignalStrengthLte.getTimingAdvance()\t " + cellSignalStrengthLte.getTimingAdvance() );
                    }
                }
            }
        }
    }

    采用北京联通4G信号进行实验，打印日志如下：

12-14 09:30:06.667 25776-25776/com.example.data.rssi E/66666: cellSignalStrengthLte.getAsuLevel()	46
12-14 09:30:06.667 25776-25776/com.example.data.rssi E/66666: cellSignalStrengthLte.getCqi()	2147483647
12-14 09:30:06.667 25776-25776/com.example.data.rssi E/66666: cellSignalStrengthLte.getDbm()	 -94
12-14 09:30:06.667 25776-25776/com.example.data.rssi E/66666: cellSignalStrengthLte.getLevel()	 4
12-14 09:30:06.667 25776-25776/com.example.data.rssi E/66666: cellSignalStrengthLte.getRsrp()	 -94
12-14 09:30:06.667 25776-25776/com.example.data.rssi E/66666: cellSignalStrengthLte.getRsrq()	 -18
12-14 09:30:06.667 25776-25776/com.example.data.rssi E/66666: cellSignalStrengthLte.getRssnr()	 2147483647
12-14 09:30:06.667 25776-25776/com.example.data.rssi E/66666: cellSignalStrengthLte.getTimingAdvance()	 2147483647

    获取手机信号强度功能——实现！