官方说法 Declaring a broadcastreceiver for android.net.conn.CONNECTIVITY_CHANGE is deprecated for apps targeting N and higher. In general, apps should not rely on this broadcast and instead use JobScheduler or GCMNetworkManager. targetSdkVersion 升级到 24 后，发现静态注册广播的方式要被取消了。 所以会造成

android.net.conn.CONNECTIVITY_CHANGE这个方法调用不到 当然24版本以前的还是可以用到这个方法 之后的可以用这个方法

ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);        connectivityManager.requestNetwork(new NetworkRequest.Builder().build(),                new ConnectivityManager.NetworkCallback() {            @Override public void onAvailable(Network network) {                super.onAvailable(network);                Toast.makeText(context,"网络状态改变了",Toast.LENGTH_SHORT).show();            }        });