网络状态

判断当前网络状态

告诉用户当前是有网络还是没网络

修改MainActivity中的代码

class NetworkChangeReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        ConnectivityManager connectionManager = (ConnectivityManager)
                getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connectionManager.getActiveNetworkInfo();
        if (networkInfo != null && networkInfo.isAvailable()) {
            Toast.makeText(context, "network is available",
                    Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(context, "network is unavailable",
                    Toast.LENGTH_SHORT).show();
        }
    }
}Code language: JavaScript (javascript)

关键就是通过isAvailable方法来判断