设置网络并且判断网络

进入网络：startActivity(new Intent(android.provider.Settings.ACTION_SETTINGS));

Intent intent = new Intent();
intent.setClassName("com.android.settings", "com.android.settings.WirelessSettings");
startActivity(intent);

判断是都有网络：

private boolean isNetworkConnexted() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo info = cm.getActiveNetworkInfo();
if (info != null && info.isConnected()) {
return true;
} else {
return false;
}
}