android中與系統相關的工具方法

1.擷取系統的skd版本號碼：
Build.VERSION.SDK
2.擷取壁紙,傳回值是Drawable :
Drawable drawable = getWallpaper();  
3.擷取手機的ip：
    public String getLocalIpAddress() {          try {              for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {                  NetworkInterface intf = en.nextElement();                  for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {                      InetAddress inetAddress = enumIpAddr.nextElement();                      if (!inetAddress.isLoopbackAddress()) {                          return inetAddress.getHostAddress().toString();                      }                  }              }          } catch (SocketException ex) {              Log.e(LOG_TAG, ex.toString());          }          return null;      }  
設定全屏
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
設定無標題
requestWindowFeature(Window.FEATURE_NO_TITLE);
設定聲音模式
setVolumeControlStream(AudioManager.STREAM_MUSIC);