Android 获取网络信息

		//onCreate()方法里面获取权限 ，注册广播
		enforceAccessPermission();
        IntentFilter intentFilter = new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE");
        registerReceiver(mNetworkBroadcastReceiver,intentFilter);

    private NetworkBroadcastReceiver mNetworkBroadcastReceiver = new NetworkBroadcastReceiver();
    public class NetworkBroadcastReceiver extends BroadcastReceiver{

        @Override
        public void onReceive(Context context, Intent intent) {
            Log.d(TAG, "onReceive: zhidong 来了");
            if(intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)){
                getNetworkType();
            }
        }
    }

    private void enforceAccessPermission(){
        this.enforceCallingOrSelfPermission(Manifest.permission.ACCESS_NETWORK_STATE,"ConnectivityService");
    }

    private void getNetworkType(){
        //获取手机所有连接管理对象
        ConnectivityManager manager =
                (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
        //获取NetworkInfo对象
        NetworkInfo networkInfo = manager.getActiveNetworkInfo();
        if(networkInfo == null){
            Log.d(TAG, "getNetworkType: zhidong network 为空");
            return;
        }

        int nType = networkInfo.getType();
        switch(nType){
            case ConnectivityManager.TYPE_WIFI:
                Log.d(TAG, "getNetworkType: zhidong network ：WIFI");
                WifiManager wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
                wifiManager.getConnectionInfo().getLinkSpeed();//获得带宽
                break;
            case ConnectivityManager.TYPE_ETHERNET:
                Log.d(TAG, "getNetworkType: zhidong network ：ETHERNET");
                String speed = runShellCommand("cat /sys/class/net/eth0/speed").trim() + "Mbps";
                break;
            default:
                Log.d(TAG, "getNetworkType: zhidong network default:"+nType);
                break;
        }
    }

    //执行shell命令
    public static String runShellCommand(String command) {
        Runtime runtime;
        Process proc = null;
        StringBuffer stringBuffer = null;
        try {
            runtime = Runtime.getRuntime();
            proc = runtime.exec(command);
            stringBuffer = new StringBuffer();
            if (proc.waitFor() != 0) {
                System.err.println("exit value = " + proc.exitValue());
            }
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    proc.getInputStream()));

            String line = null;
            while ((line = in.readLine()) != null) {
                stringBuffer.append(line + " ");
            }

        } catch (Exception e) {
            System.err.println(e);
        } finally {
            try {
                proc.destroy();
            } catch (Exception e2) {
            }
        }
        return stringBuffer.toString();
    }