获取手机信号强度，包括WiFi，2G，4G

因为业务需要，获取到手机主板的信号强度，包括WiFi，4G，2G。来验证当前主板模块是否是因为信号不好而导致问题，我去网上查询了几遍，将一些文章结合起来。最后获取到相关数据。以下是相关的操作步骤

1.加权限

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

2.实例化TelephonyManager，建立起PhoneStatListener监听（主要是带SIM卡的状态监听），再注册一个NetWorkBroadCastReceiver监听。

//获取telephonyManager
mTelephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
//开始监听
mListener = new PhoneStatListener();
mNetWorkBroadCastReciver = new NetWorkBroadCastReciver();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
intentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
intentFilter.addAction(WifiManager.RSSI_CHANGED_ACTION);
registerReceiver(mNetWorkBroadCastReciver, intentFilter);

mTelephonyManager.listen(mListener, PhoneStatListener.LISTEN_SIGNAL_STRENGTHS);

/**
 * 观察手机带SIM卡时的信号强度
 */
private class PhoneStatListener extends PhoneStateListener {
    //获取信号强度

    @Override
    public void onSignalStrengthsChanged(SignalStrength signalStrength) {
        super.onSignalStrengthsChanged(signalStrength);

        signal=signalStrength;
        //网络信号改变时，获取网络信息
        getNetWorkInfo();
    }
}

//接收网络状态改变的广播
class NetWorkBroadCastReciver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        getNetWorkInfo();
    }
}

  /**
     * 获取网络的信息
     */
    private void getNetWorkInfo() {
        ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo info = connectivityManager.getActiveNetworkInfo();
        if (info != null && info.isAvailable()) {
            switch (info.getType()) {
                case ConnectivityManager.TYPE_WIFI:
                    //wifi
                    WifiManager manager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
                    WifiInfo connectionInfo = manager.getConnectionInfo();
                    int rssi = connectionInfo.getRssi();
                    mTextView.setText("当前为wifi网络，信号强度=" + rssi);
                    break;
                case ConnectivityManager.TYPE_MOBILE:
                    //移动网络,可以通过TelephonyManager来获取具体细化的网络类型
                    String netWorkStatus = isFastMobileNetwork() ? "4G网络" : "2G网络";
                    if (isFastMobileNetwork()){
                        try {
                            if (signal==null){
                                Log.e("tiwolf", "getNetWorkInfo: signal为空" );
                                return;
                            }
                         
                            Method method=signal.getClass().getMethod("getDbm");
                            mGsmSignalStrength= (int) method.invoke(signal);
                            if(mGsmSignalStrength>-90){
                                Log.e("tiwolf", "getNetWorkInfo: 信号强度强" );
                            }else {
                                Log.e("tiwolf", "getNetWorkInfo: 信号强度弱" );
                            }
                        } catch (NoSuchMethodException e) {
                            e.printStackTrace();
                        } catch (IllegalAccessException e) {
                            e.printStackTrace();
                        } catch (InvocationTargetException e) {
                            e.printStackTrace();
                        }

                    }else {
                        //获取网络信号强度
                        //获取0-4的5种信号级别，越大信号越好,但是api23开始才能用
//            int level = signalStrength.getLevel();
                        if (signal==null){
                            Log.e("tiwolf", "getNetWorkInfo: signal为空" );
                            return;
                        }
                        mGsmSignalStrength = signal.getGsmSignalStrength();
                    }
                    mTextView.setText("当前为" + netWorkStatus + "，信号强度=" + mGsmSignalStrength);
                    Log.e("tiwolf", "当前为" + netWorkStatus + "，信号强度=" + mGsmSignalStrength );
                    break;
            }
        } else {
            mTextView.setText("没有可用网络");
        }
    }

最后结束取消监听，取消注册

mTelephonyManager.listen(mListener, PhoneStatListener.LISTEN_NONE);

unregisterReceiver(mNetWorkBroadCastReciver);

大体的就是这样子，后面有文档上传到csdn，有需要的可以去下载