判断手机是否连网

/**
*
* @author Arvin
*
* @date 2012-7-14 下午5:27:20
*/
public class ConnectionDetector {
private Context _context;

public ConnectionDetector(Context context) {
this._context = context;
}

public boolean isConnectingToInternet() {
ConnectivityManager connectivity = (ConnectivityManager) _context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null) {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null)
for (int i = 0; i < info.length; i++)
if (info[i].getState() == NetworkInfo.State.CONNECTED) {
return true;
}

}
return false;
}


调用
ConnectionDetector detector = new ConnectionDetector(
getApplicationContext());
boolean isConnect = detector.isConnectingToInternet();
Toast.makeText(getApplication(), isConnect + "", Toast.LENGTH_LONG)
.show();

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