android 是否有网络连接

获取网络信息需要在AndroidManifest.xml文件中加入相应的权限。

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

public boolean isNetworkConnected(Context context) {
if (context != null) {
ConnectivityManager mConnectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
if (mNetworkInfo != null) {
return mNetworkInfo.isAvailable();
}
}
return false;
}