android检测网络状态

Context.getSystemService(Context.CONNECTIVITY_SERVICE)

private boolean goodNet(){
ConnectivityManager manager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo networkinfo = manager.getActiveNetworkInfo();
if (networkinfo == null || !networkinfo.isAvailable()) {
// 当前网络不可用 你该干嘛干嘛
Toast.makeText(this, "没有可用网络", Toast.LENGTH_LONG).show();
return false;
}
return true;
}