Android 已连接网络上的活动Internet连接

我的应用程序活动有一段代码，在访问FireBase Auth Login之前，我想检查连接的网络是否具有活动连接

我为networkState创建了一个类，并添加了一块用于检查networkActiveConnection的代码

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应用程序不断崩溃。没有解决方案我无法行动。我错过了什么？是否有其他方法来检查连接的网络是否有活动连接？

最后我找到了答案。这实际上是由于版本的原因。在Android 3.0及以上版本中，所有长流程活动都只能在AsyncTask上工作

我通过Google.com的负载检查重新构建了设备中的实际互联网连接。我不知道google.com关闭后会发生什么

下面的代码可能会有所帮助

@SuppressLint("StaticFieldLeak")
public class activeConnection extends AsyncTask<Void, Void, Boolean> {

    @Override
    protected Boolean doInBackground(Void... params) {

        try {
            URL url = new URL("http://www.google.com");
            HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
            urlc.setConnectTimeout(3000);
            urlc.connect();
            if (urlc.getResponseCode() == 200) {
                return true;
            }
        } catch (MalformedURLException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
            return false;
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return false;
        }
        return false;
    }

    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
    @Override
    protected void onPostExecute(Boolean result) {
        if (!result) { // code if not connected

            AlertDialog.Builder builder = new AlertDialog.Builder(Customers.this, R.style.MyDialogTheme);
            builder.setTitle("ALERT");
            builder.setMessage("Activate your Internet connection and Try again");
            builder.setCancelable(false);

            builder.setPositiveButton(
                    "Retry",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            dialog.cancel();
                            new activeConnection().execute();
                        }
                    });


            AlertDialog alert11 = builder.create();
            alert11.show();
        } else { // code if connected


        }
    }
}

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在搜索hourI验证此答案并修改我的代码后，发现此答案可能重复。请修改我的密码

@SuppressLint("StaticFieldLeak")
public class activeConnection extends AsyncTask<Void, Void, Boolean> {

    @Override
    protected Boolean doInBackground(Void... params) {

        try {
            URL url = new URL("http://www.google.com");
            HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
            urlc.setConnectTimeout(3000);
            urlc.connect();
            if (urlc.getResponseCode() == 200) {
                return true;
            }
        } catch (MalformedURLException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
            return false;
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return false;
        }
        return false;
    }

    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
    @Override
    protected void onPostExecute(Boolean result) {
        if (!result) { // code if not connected

            AlertDialog.Builder builder = new AlertDialog.Builder(Customers.this, R.style.MyDialogTheme);
            builder.setTitle("ALERT");
            builder.setMessage("Activate your Internet connection and Try again");
            builder.setCancelable(false);

            builder.setPositiveButton(
                    "Retry",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            dialog.cancel();
                            new activeConnection().execute();
                        }
                    });


            AlertDialog alert11 = builder.create();
            alert11.show();
        } else { // code if connected


        }
    }
}