网络是否连接

注意：需要在XML文件中配置权限
uses-permission android:name=”android.permission.ACCESS_NETWORK_STATE”

 @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        boolean work = isNetWork(getActivity());
        if (work == true){
            Toast.makeText(getActivity(),"网络已连接！！！",Toast.LENGTH_LONG).show();
        }else {
            Toast.makeText(getActivity(),"网络未连接！！！",Toast.LENGTH_LONG).show();
            //跳转到设置页面
            startActivity(new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS))
        }
    }

    public boolean isNetWork(Context context){
        if (context != null){
            ConnectivityManager manager= (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo info = manager.getActiveNetworkInfo();
            if (info != null){
                return info.isAvailable();
            }
        }
        return false;
    }