启用wifi时检查Internet是否已在设备上连接 [英] Check Internet is Connected on Device or not when wifi is enable

问题描述

我面临有关设备是否可以在互联网上使用的问题.让我用一个示例简要解释我的查询: 我已经用一个用例测试了我的应用程序，即我已经在路由器wifi上进行了测试，但是我从路由器上拔下了以太网电缆，并使用以下代码在wifi上连接了我的设备:

I have facing a problem regarding device is available on internet or not.Let me explain my query in brief with a example: I have test my application with a use case i.e I have on my router wifi but I unplug the Ethernet cable from my router and connect my device on wifi and by using following code:

private boolean checkConnection() {
    boolean connected = false;
    ConnectivityManager cm = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);

    if (cm != null) {
        NetworkInfo[] netInfo = cm.getAllNetworkInfo();

        for (NetworkInfo ni : netInfo) {
            if ((ni.getTypeName().equalsIgnoreCase("WIFI")
                || ni.getTypeName().equalsIgnoreCase("MOBILE"))
                & ni.isConnected() & ni.isAvailable()) {
                connected = true;
            }

        }
    }

    return connected;
}

我将获得一个用于连接的布尔值标志.此代码返回交换机的设备状态，这意味着我的设备是否已连接WiFi，但我不会从服务器或主机获得任何响应，因此，我需要检查互联网的可行性不论是否在我的设备上.请有人帮我做同样的事情.我尝试了许多使用眼神的方法或方法，但未成功.

I will get a Boolean flag for connectivity .This code return the device status of switch means my device is connected with WiFi or not but I will not getting any response from the server or host,So I need to check the internet feasibility on my device or not .Please some one help me for the same.I have tried many goggling approaches or methodology but failed in success.

谢谢.

推荐答案

      On button click 
        if(isInternetON(MainActivity.this)){
        mMyDownloadTask = new MyDownloadTask();
        delayCancel = new DelayCancel(mMyDownloadTask);
        handler.postDelayed(delayCancel,3*1000);
        mMyDownloadTask.execute();



        }



  public static class MyDownloadTask extends AsyncTask<Boolean,Void,Boolean> {

        public MyDownloadTask() {

        }

        protected Boolean doInBackground(Boolean... params) {
            try {
                URL url = new URL("http://www.google.com");
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();
//              connection.setRequestMethod("Head");
//              connection.setConnectTimeout(2000);
                connection.connect();

                int code = connection.getResponseCode();
                Log.e(TAG, "code : " + code);
                if (code == 200) {
                    ThreadActivity.isAviliable = true;
                    MainActivity.value = "true";
                    return true;

                } else {
                    ThreadActivity.isAviliable = false;
                    MainActivity.value = "false";
                    return false;

                }

            } catch (Exception e) {
                ThreadActivity.isAviliable = false;
                MainActivity.value = "false";
                e.printStackTrace();
                return false;
            }

        }

        protected void onPostExecute(Boolean result) {
            // dismiss progress dialog and update ui
            Log.e(TAG,"result "+result);
            if(result){
                ThreadActivity.isAviliable = true;
                MainActivity.value = "true";
            }else{
                ThreadActivity.isAviliable = false;
                MainActivity.value = "false";
            }

        }
    }
    public static class DelayCancel implements Runnable{
        private AsyncTask task;

        public DelayCancel(AsyncTask task) {
            this.task = task;

        }

        @Override
        public void run() {
            Log.e(TAG, "Running.....");
            if (task.getStatus() == AsyncTask.Status.RUNNING) {
                task.cancel(true);
                Log.e(TAG, "Cancel 1.....");
                ThreadActivity.isAviliable = false;
                MainActivity.value = "false";
            }
            if (task.getStatus() == AsyncTask.Status.PENDING){
                task.cancel(true);
                ThreadActivity.isAviliable = false;
                MainActivity.value = "false";
                Log.e(TAG, "Cancel 2.....");
            }
        }
    }

    public static boolean isInternetON(Context ctx){

        ConnectivityManager cm =(ConnectivityManager)ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();

       /* Log.e("Common Class","activeNetwork.getState()"+activeNetwork.getState());
        Log.e("Common Class","activeNetwork.isAvailable()"+activeNetwork.isAvailable());
        Log.e("Common Class","activeNetwork.getReason()"+activeNetwork.getReason());
        Log.e("Common Class","activeNetwork.getExtraInfo()"+activeNetwork.getExtraInfo());
        Log.e("Common Class","activeNetwork.describeContents()"+activeNetwork.describeContents());
        Log.e("Common Class","activeNetwork.isConnectedOrConnecting()"+activeNetwork.isConnectedOrConnecting());
        Log.e("Common Class","activeNetwork.isFailover()"+activeNetwork.isFailover());*/

        boolean isConnected = activeNetwork != null && activeNetwork.isConnectedOrConnecting() && activeNetwork.isAvailable();

        return isConnected;
    }

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