Android_ConnectivityManager连接管理

ConnectivityManager

ConnectivityManager作为安卓网络连接管理类，主要功能如下：

1. 通知应用网络状态的改变，发送广播 ACTION:CONNECTIVITY_ACTION

2. WiFi，GPRS等网络的连接管理(是否可用，连接状态等)

3. 提供了一种api来让应用去请求或是选择网络来进行数据的传输

需要的权限：

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

NetWorkActivity

public class NetWorkActivity extends ActionBarActivity {

private final static String TAG = "RAISE";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_net_work);
check_network();

IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(NetworkReceiver, filter);
}

private void check_network() {
//获取网络管理类
ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
//得到当前可以使用的网络
NetworkInfo activeNetworkInfo = manager.getActiveNetworkInfo();
//判断当前网络类型
if (activeNetworkInfo != null) {
if (activeNetworkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
Log.d(TAG, "当前网络：" + activeNetworkInfo.getTypeName());
} else if (activeNetworkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
Log.d(TAG, "当前网络：" + activeNetworkInfo.getTypeName());
}
NetworkInfo.State state = activeNetworkInfo.getState();
if (state.ordinal() ==NetworkInfo.State.CONNECTED.ordinal()) {
Log.d(TAG, activeNetworkInfo.getTypeName() + "网络可用");
}
} else {
Log.d(TAG, "无网络可用");
}
}

BroadcastReceiver NetworkReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
Log.d(TAG, "广播接受");
check_network();
}
}
};

@Override
protected void onDestroy() {
unregisterReceiver(NetworkReceiver);
super.onDestroy();
}
}

经测试发现，这个广播会在注册之后有一次调用

这个广播只会在当前网络切换为另一种网络(必须可上网)或是无网络时，才会调用

上图：



当然也可以分别获得mobile和wifi的NetworkInfo来分别处理

NetworkInfo mobile_networkInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
NetworkInfo wifi_networkInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
if (mobile_networkInfo.isConnected()){
//...
}