Question

我使用一个功能通过发送ping成功检测Android 4.1到6.0应用中的互联网连接。（因为，请记住，连接到WiFi或移动网络本身并不能保证，该设备实际上可以访问互联网。）我的问题是我发现由于某种原因，我的代码在Android 4.3中无效。你知道怎么解决这个问题吗？或者，您是否知道在Android 4.1 - 6.0版本的所有设备上检测互联网连接的更好方法？

    //this function works perfectly!! except in Android 4.3 Jellybean
    public boolean isOnline() {
            Runtime runtime = Runtime.getRuntime();
            try {
                Process ipProcess = runtime.exec("/system/bin/ping -c 1 8.8.8.8");
                int     exitValue = ipProcess.waitFor();
                if(exitValue==0)
                    app.logy("PING @K - ONLINE!!");
                return (exitValue == 0);
            } catch (IOException e){
                e.printStackTrace();
                app.logy("PING ERROR - OFFLINE");
                return false;
                }
            catch (InterruptedException e){
                e.printStackTrace();
                app.logy("PING ERROR - OFFLINE");
                return false;
            }
        }

Answer 1

http://clients3.google.com/generate_204用于检查连接，ping在不同设备中的工作方式不同。

Why does ping works on some devices and not others?

private int inter = 0;   





            class checkconne extends AsyncTask<String, String, String> {

                        @Override
                        protected void onPreExecute() {
                            super.onPreExecute();



                        }
                        @Override
                        protected String doInBackground(String... args) {

                            int kk=0;
                            try {
                                HttpURLConnection urlc = (HttpURLConnection)
                                        (new URL("http://clients3.google.com/generate_204")
                                                .openConnection());
                                urlc.setRequestProperty("User-Agent", "Android");
                                urlc.setRequestProperty("Connection", "close");
                                urlc.setConnectTimeout(1500);
                                urlc.connect();
                                kk= urlc.getResponseCode();
                            } catch (IOException e) {
                                Log.e("qweqwe", "Error checking internet connection", e);
                            }

                            inter=kk;



                            return null;
                        }
                        @Override
                        protected void onPostExecute(String file_url) {


                            if (inter == 204){       
             Toast.makeText(MainActivity3.this, "is connected", Toast.LENGTH_LONG).show();             

                            }else{    


                                Toast.makeText(MainActivity3.this, "No connection", Toast.LENGTH_LONG).show();

                            }


                        }
                    }

使用ping验证互联网连接仅在Android 4.3 Jellybean中失败

1 个答案: