android 获取系统的参数(如音量大小，背光，网络类型等)

private int getBrightness(){
        int brightness = -1;
        try{
            brightness = Settings.System.getInt(this.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);
        }catch(SettingNotFoundException ex){
            //new Exception(ex.toString());
        }

        return brightness;
    }

    private int getVolume(){
        int volume = -1;
        AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
        volume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);

        return volume;
    }

    private String getNetworkType(){
        ConnectivityManager connManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkinfo = connManager.getActiveNetworkInfo();
        String networkType = "";
        if(networkinfo != null){
            networkType = networkinfo.getTypeName();
        }

        return networkType;
    }