java Android 检查当前是否已经连接上 Internet

这段代码用来在程序中检查当前是否已经联网

java代码

ConnectivityManager con=(ConnectivityManager)getSystemService(Activity.CONNECTIVITY_SERVICE);boolean wifi=con.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting();boolean internet=con.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).isConnectedOrConnecting();

AndroidManifest.xml

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