安卓网络连接全解：包括网络连接状态的监听、网络数据使用状态的监听、获取当前网络连接情况、启动wifi、获取当前连接wifi的网络情况、扫描wifi热点

全栈工程师开发手册 （作者：栾鹏）

安卓教程全解

安卓网络连接情况全解：包括网络连接状态的监听、网络数据使用状态的监听、获取当前网络连接情况、启动wifi、获取当前连接wifi的网络情况、扫描wifi热点

网络连接情况的监听和网络数据使用情况的监听

private void listen_net()
{
//注册用于监听后台数据使用情况变化的BroadcastReceiver
registerReceiver(new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Log.v("网络数据使用变化", "");
}
},new IntentFilter(ConnectivityManager.ACTION_BACKGROUND_DATA_SETTING_CHANGED)   //触发监听的广播行为
);

//用于监听网络连接变化的BroadcastReceiver
registerReceiver(new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Log.v("网络连接变化", "网络状态已经改变");
netinfo();
}
},new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION) //触发监听的广播行为
);
}

获取当前网络信息

移动网络和wifi网络都是网络情况的一种情况

public void netinfo()
{
//访问Connectivity Manager网络连接服务
String service = Context.CONNECTIVITY_SERVICE;
final ConnectivityManager connectivity = (ConnectivityManager)getSystemService(service);

//访问网络信息
NetworkInfo activeNetwork = connectivity.getActiveNetworkInfo();
boolean isConnected = ((activeNetwork  != null) && (activeNetwork.isConnectedOrConnecting()));
boolean isWiFi = activeNetwork.getType() == ConnectivityManager.TYPE_WIFI;
Log.v("网络信息", "是否已连接网络："+isConnected);
Log.v("网络信息", "是否连接了wifi："+isWiFi);
if(isConnected)
{
String netname=activeNetwork.getTypeName();
Log.v("网络信息", "网络名称："+netname);
}
}

启动wifi、扫描wifi热点

wifi是网络连接的一种

private void scan_wifi() {
//访问Wi-Fi Manager
String service = Context.WIFI_SERVICE;
final WifiManager wifi = (WifiManager)getSystemService(service);

//监听并更改Wi-Fi状态
if (!wifi.isWifiEnabled())
if (wifi.getWifiState() != WifiManager.WIFI_STATE_ENABLING)
wifi.setWifiEnabled(true);

//扫描wifi接入点，在开启了wifi，但还没有连上任何一个ssid时才会触发
//注册用于接收扫描结果的broadcast receiver
registerReceiver(new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
List<ScanResult> results = wifi.getScanResults();
ScanResult bestSignal = null;
for (ScanResult result : results) {
if (bestSignal == null || WifiManager.compareSignalLevel(bestSignal.level,result.level) < 0)
bestSignal = result;
}
String connSummary = String.format("%s 个网络被发现，其中 %s 是信号最强的",results.size(),bestSignal.SSID);
Log.d("wifi扫描", connSummary);
}
}, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));

//开始扫描
wifi.startScan();
}

获取当前wifi连接情况

private void wifiinfo()
{
//访问Wi-Fi Manager
String service = Context.WIFI_SERVICE;
final WifiManager wifi = (WifiManager)getSystemService(service);

//监听并更改Wi-Fi状态
if (!wifi.isWifiEnabled())
if (wifi.getWifiState() != WifiManager.WIFI_STATE_ENABLING)
wifi.setWifiEnabled(true);

//查询活动的网络连接，在连接到某个ssid时才触发
WifiInfo info = wifi.getConnectionInfo();
if (info.getBSSID() != null) {
int strength = WifiManager.calculateSignalLevel(info.getRssi(), 5); //信号强弱
int speed = info.getLinkSpeed();//网上速率
String units = WifiInfo.LINK_SPEED_UNITS; //速率单位
String ssid = info.getSSID(); //ssid
String mac = info.getMacAddress(); //mac地址
int ip = info.getIpAddress();  //ip地址

String cSummary = String.format("当前wifi正连接到%s，速度%s%s，信号强度 %s/5",ssid, speed, units, strength);
Log.d("wifi连接", cSummary);
}

}