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;
}