Android的检查，如果有WIFI，但没有互联网 [英] Android Check if there is WiFi but no internet

问题描述

我写一个程序，我需要检查三种状态：1。如果我有没有WiFi，2。如果我的WiFi，但没有互联网连接（比如，如果我把我的路由器，但拔掉网线），以及3.如果我有无线网络和互联网连接。然后，我会改变图标的​​颜色在我的应用程序，以重新present这些状态（红色，黄色或绿色）之一。目前条件2不工作，任何时候我拔掉数据线我的路由器进行测试时，该图标的颜色从绿色变为红色。

 公共静态无效的兴奋剂（上下文的背景下）{

        字符串googleUrl =htt​​ps://www.google.com;
        ConnectivityManager厘米=（ConnectivityManager）context.getSystemService（Context.CONNECTIVITY_SERVICE）;

        尝试 {
            的HttpParams httpParameters =新BasicHttpParams（）;
            HttpConnectionParams.setConnectionTimeout（httpParameters，TIMEOUT_C​​ONNECTION）;

            HttpConnectionParams.setSoTimeout（httpParameters，TIMEOUT_SOCKET）;

            HttpClient的客户端=新DefaultHttpClient（httpParameters）;
            如果（L）Log.i（TAG，叫：+网址）;
            HTTPGET getGoogle = getHttpGet（googleUrl）;
            HTT presponse responseGoogle = client.execute（getGoogle）;

            如果（responseGoogle！= NULL）{
                 connectionIconView.setIcon（R.drawable.green_wifi）;
            }
            否则，如果（cm.getNetworkInfo（ConnectivityManager.TYPE_WIFI）！= NULL）{
                connectionIconView.setIcon（R.drawable.yellow_wifi）;
            }
            其他 {
                 connectionIconView.setIcon（R.drawable.red_wifi）;
            }

        }赶上（例外五）{
            如果（L）Log.e（TAG，在HTTP调用错误）;
            e.printStackTrace（）;
        }
 

解决方案

检查是否WiFi是可用这样的

功能1

 私人布尔isWifiAvailable（）{
    ConnectivityManager connManager =（ConnectivityManager）getSystemService（Context.CONNECTIVITY_SERVICE）;
    的NetworkInfo无线= connManager.getNetworkInfo（ConnectivityManager.TYPE_WIFI）;

    返回wifi.isConnected（）;
}
 

在此，请像这样，如果互联网可

功能2

 公共静态布尔isInternetAccessible（上下文的背景下）{
 如果（isWifiAvailable（））{
    尝试 {
        HttpURLConnection的urlc =（HttpURLConnection类）（新的URL（http://www.google.com）.openConnection（））;
        urlc.setRequestProperty（用户代理，测试）;
        urlc.setRequestProperty（连接，关闭）;
        urlc.setConnectTimeout（1500）;
        urlc.connect（）;
        返程（urlc.getResponse code（）== 200）;
    }赶上（IOException异常E）{
        Log.e（LOG_TAG，无法检查网络连接，E）;
    }
} 其他 {
    Log.d（LOG_TAG，网络不可用！）;
}
返回false;
}
 

条件

1. 如果功能1 返回false - >变为红色
2. 如果功能1 返回true和函数2 返回false - >变为黄色
3. 如果这两个函数返回true - >改变颜色为绿色

I am writing a program where I need to check three states: 1. If I have no WiFi, 2. if I have WiFi but no internet connection (like if I turn on my router but unplug the Ethernet cable), and 3. if I have WiFi and internet connection. I would then change color of a icon in my app to represent one of these states (red, yellow, or green). Currently condition 2 does not work, anytime I unplug the cable on my router for testing, the icon color changes from green to red.

public static void doPing(Context context) {

        String googleUrl = "https://www.google.com";
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        try {
            HttpParams httpParameters = new BasicHttpParams();
            HttpConnectionParams.setConnectionTimeout(httpParameters, TIMEOUT_CONNECTION);

            HttpConnectionParams.setSoTimeout(httpParameters, TIMEOUT_SOCKET);

            HttpClient client = new DefaultHttpClient(httpParameters);
            if (L) Log.i(TAG, "Calling: " + url );
            HttpGet getGoogle = getHttpGet(googleUrl);
            HttpResponse responseGoogle = client.execute(getGoogle);

            if (responseGoogle != null){
                 connectionIconView.setIcon(R.drawable.green_wifi);
            }
            else if (cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI) != null){
                connectionIconView.setIcon(R.drawable.yellow_wifi);
            }
            else {
                 connectionIconView.setIcon(R.drawable.red_wifi);
            }

        } catch(Exception e) {
            if (L) Log.e(TAG, "Error during HTTP call");
            e.printStackTrace();
        }

解决方案

Check if wifi is available like this

function 1

private boolean isWifiAvailable() {
    ConnectivityManager connManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo wifi = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

    return wifi.isConnected();
}

After this, check like this if internet is available

function 2

 public static boolean isInternetAccessible(Context context) {
 if (isWifiAvailable()) {
    try {
        HttpURLConnection urlc = (HttpURLConnection) (new URL("http://www.google.com").openConnection());
        urlc.setRequestProperty("User-Agent", "Test");
        urlc.setRequestProperty("Connection", "close");
        urlc.setConnectTimeout(1500); 
        urlc.connect();
        return (urlc.getResponseCode() == 200);
    } catch (IOException e) {
        Log.e(LOG_TAG, "Couldn't check internet connection", e);
    }
} else {
    Log.d(LOG_TAG, "Internet not available!");
}
return false;
}

Conditions

1. If function 1 returns false --> change color to RED
2. If function 1 return true and function 2 returns false --> change color to YELLOW
3. If both functions return true --> change color to GREEN

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