05.Android 网络连接监听

register

        IntentFilter filter = new IntentFilter();
        filter.addAction(PROVIDERS_CHANGED_ACTION);
        filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
        // 注册广播
        mContext.registerReceiver(gpsReceiver, filter);

BroadcastReceiver

    private BroadcastReceiver gpsReceiver = new BroadcastReceiver() {


        @Override
        public void onReceive(Context context, Intent intent) {
            Log.i(TAG, "网络状态发生变化");
            boolean isConnect = false;
            //检测API是不是小于23，因为到了API23之后getNetworkInfo(int networkType)方法被弃用
            if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.LOLLIPOP) {

                //获得ConnectivityManager对象
                ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

                //获取ConnectivityManager对象对应的NetworkInfo对象
                //获取WIFI连接的信息
                NetworkInfo wifiNetworkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
                //获取移动数据连接的信息
                NetworkInfo dataNetworkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
                if (wifiNetworkInfo.isConnected() && dataNetworkInfo.isConnected()) {
                    Toast.makeText(context, "WIFI已连接,移动数据已连接", Toast.LENGTH_SHORT).show();
                  
                    Log.i(TAG, "WIFI已连接,移动数据已连接");
                } else if (wifiNetworkInfo.isConnected() && !dataNetworkInfo.isConnected()) {
                    Toast.makeText(context, "WIFI已连接,移动数据已断开", Toast.LENGTH_SHORT).show();
                  
                    Log.i(TAG, "WIFI已连接,移动数据已断开");
                } else if (!wifiNetworkInfo.isConnected() && dataNetworkInfo.isConnected()) {
                    Toast.makeText(context, "WIFI已断开,移动数据已连接", Toast.LENGTH_SHORT).show();
                   
                    Log.i(TAG, "WIFI已断开,移动数据已连接");
                } else {
                    Toast.makeText(context, "WIFI已断开,移动数据已断开", Toast.LENGTH_SHORT).show();
               
                    Log.i(TAG, "WIFI已断开,移动数据已断开");
                }
                //API大于23时使用下面的方式进行网络监听
            } else {
                Log.i(TAG, "API level 大于23");
                //获得ConnectivityManager对象
                ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
                //获取所有网络连接的信息
                Network[] networks = connMgr.getAllNetworks();
                //通过循环将网络信息逐个取出来
                for (int i = 0; i < networks.length; i++) {
                    //获取ConnectivityManager对象对应的NetworkInfo对象
                    NetworkInfo networkInfo = connMgr.getNetworkInfo(networks[i]);
                    if (networkInfo != null && networkInfo.isConnected())
                        isConnect = true;
                }
                if (isConnect) {
                    Log.i(TAG, "网络连接");                    
                } else {
                    Log.i(TAG, "没有网络");
                }
            }
        }
    };

unregister

   mContext.unregisterReceiver(gpsReceiver);