判断网络是否连接 public boolean isNetworkConnected(Context context) { // 判断网络的方法 if (context != null) { ConnectivityManager mConnectivityManager = (ConnectivityManager) context .getSystemService(CONNECTIVITY_SERVICE); NetworkInfo mNetworkInfo = mConnectivityManager .getActiveNetworkInfo();// 获取网络连接状态信息 if (mNetworkInfo != null) {// 如果不为空 return mNetworkInfo.isAvailable();// 返回网络状态属于活动状态 } } return false; } 判断wifi连接状态和改变wifi状态方法 WifiManager wifimanager=(WifiManager) MainActivity.this.getSystemService(WIFI_SERVICE); if(wifimanager.isWifiEnabled()){ wifimanager.setWifiEnabled(false);//关闭wifi方法 Toast.makeText(MainActivity.this, "wifi已经关闭！！", Toast.LENGTH_LONG) .show(); }else{ wifimanager.setWifiEnabled(true); Toast.makeText(MainActivity.this, "wifi已经打开", Toast.LENGTH_LONG) .show();

SharedPreferences