清單文件申請權限ACCESS_NETWORK_STATE

新建廣播接收者繼承BroadcastReceiver,重寫onReceive方法

@Override

public void onReceive(Context context,Intent intent) {

ConnectivityManager connectivityManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo networkInfo =connectivityManager.getActiveNetworkInfo();

if (networkInfo !=null &&networkInfo.isAvailable()) {

????????//網(wǎng)絡連接

}else {

????????//網(wǎng)絡斷開

}

}

MainActivity注冊廣播接收者

IntentFilter intentFilter =new IntentFilter();

intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");

networkChang =new NetChange();

registerReceiver(networkChang,intentFilter);

網(wǎng)絡連接狀態(tài)發(fā)生變化時會回調(diào)onReceive方法,通過判斷發(fā)送網(wǎng)絡是否連接的消息,在需要監(jiān)聽的位置接收網(wǎng)絡發(fā)生變化的消息處理即可