/*** 测试ConnectivityManager ConnectivityManager主要管理和网络连接相关的操作* 相关的TelephonyManager则管理和手机、运营商等的相关信息；WifiManager则管理和wifi相关的信息。* 想访问网络状态，首先得添加权限<uses-permission* android:name="android.permission.ACCESS_NETWORK_STATE"/>* NetworkInfo类包含了对wifi和mobile两种网络模式连接的详细描述,通过其getState()方法获取的State对象则代表着* 连接成功与否等状态。* */public void testConnectivityManager() {ConnectivityManager connManager = (ConnectivityManager) this.getSystemService(CONNECTIVITY_SERVICE);// 获取代表联网状态的NetWorkInfo对象NetworkInfo networkInfo = connManager.getActiveNetworkInfo();// 获取当前的网络连接是否可用if (null == networkInfo) {Toast.makeText(this, "当前的网络连接不可用", Toast.LENGTH_SHORT).show();// 当网络不可用时，跳转到网络设置页面startActivityForResult(new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS), 1);} else {boolean available = networkInfo.isAvailable();if (available) {Log.i("通知", "当前的网络连接可用");Toast.makeText(this, "当前的网络连接可用", Toast.LENGTH_SHORT).show();} else {Log.i("通知", "当前的网络连接不可用");Toast.makeText(this, "当前的网络连接不可用", Toast.LENGTH_SHORT).show();}}State state = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();if (State.CONNECTED == state) {Log.i("通知", "GPRS网络已连接");Toast.makeText(this, "GPRS网络已连接", Toast.LENGTH_SHORT).show();}state = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();if (State.CONNECTED == state) {Log.i("通知", "WIFI网络已连接");Toast.makeText(this, "WIFI网络已连接", Toast.LENGTH_SHORT).show();}// // 跳转到无线网络设置界面// startActivity(new// Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS));// // 跳转到无限wifi网络设置界面// startActivity(new// Intent(android.provider.Settings.ACTION_WIFI_SETTINGS));
}

public class NetworkStateReceiver extends BroadcastReceiver {private static final String TAG = "NetworkStateReceiver";@Overridepublic void onReceive(Context context, Intent intent) {if (!isNetworkAvailable(context)) {Toast.makeText(context, "网络已经断开!", 0).show();} elseToast.makeText(context, "网络已经连接", 0).show();}/*** 网络是否可用* * @param context* @return*/public static boolean isNetworkAvailable(Context context) {//获取ConnectivityManager对象ConnectivityManager mgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);//获取当前网络连接列表NetworkInfo[] info = mgr.getAllNetworkInfo();if (info != null) {//遍历网络信息for (int i = 0; i < info.length; i++) {if (info[i].getState() == NetworkInfo.State.CONNECTED) {return true;}}}return false;}}