网络连接判断

//判断网络连接ConnectivityManager cwjManager=(ConnectivityManager)this.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo info = cwjManager.getActiveNetworkInfo();if (info != null && info.isAvailable()){    Toast.makeText(this,"连接成功",Toast.LENGTH_SHORT).show();}else{    Toast.makeText(this,"无互联网连接",Toast.LENGTH_SHORT).show();}