Android与One Plus上的ESP8266的连接(Android 6.0.1)

问题描述

Android 6.0上的改装在连接到接入点后进行Http调用时出现问题

Retrofit on Android 6.0 has a problem making Http calls after connecting to Access Point

复制步骤:

1. 连接到Esp8266接入点
2. 对 http://192.168.4.1 进行http调用(esp8266访问点的默认网关)WIFI的IP地址为192.168.4.2
3. 它引发以下异常

1. Connect to Esp8266 Access Point
2. Make an http call to http://192.168.4.1 (Default gateway of esp8266 accesspoint)The IP address of WIFI is 192.168.4.2
3. It throws the below exception

我已经在Android 5.1上尝试过相同的功能，并且相同的代码也可以正常工作

I have tried the same on Android 5.1 and the same code works flawlessly

推荐答案

问题

错误ENONET表示NetworkInfo.isConnected()返回false

解决方案

产生一个守护进程线程，该线程等待Wifi网络(由ssid提供)完全"连接(请参见上文)，并使用true(成功连接)或false(超时)调用您的callback或错误).

Solution

Spawn a daemon Thread which waits for the Wifi network (given by ssid) to "fully" connect (see above) and call your callback with either true (successfully connected) or false (timeout or error).

private ConnectivityManager connectivity = ...;
private WifiManager wifi = ...;

private void waitForWifi(final String ssid, final Consumer<Boolean> callback) {
    final Thread thread = new Thread(() -> {
        for (int i = 0; i < 300; i++) {
            final WifiInfo info = wifi.getConnectionInfo();
            NetworkInfo networkInfo = null;

            for (final Network network : connectivity.getAllNetworks()) {
                final NetworkCapabilities capabilities = connectivity.getNetworkCapabilities(network);

                if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                    networkInfo = connectivity.getNetworkInfo(network);
                    break;
                }
            }

            if (info != null && info.ssid == ssid && networkInfo != null && networkInfo.isConnected()) {
                callback.accept(true);
                return;
            }

            Thread.sleep(100);
        }

        callback.accept(false);
    });

    thread.setDaemon(true);
    thread.start();
}

注释

• ssid必须用双引号引起来(请参见wifiConfiguration.SSID)
• ConnectivityManager.getAllNetworks()需要权限ACCESS_NETWORK_STATE
• WifiManager.getConnectionInfo()需要权限ACCESS_NETWORK_STATE和ACCESS_COARSE_LOCATION(运行时权限)

Notes

• ssid must be enclosed in double quotation marks (see wifiConfiguration.SSID)
• ConnectivityManager.getAllNetworks() requires permission ACCESS_NETWORK_STATE
• WifiManager.getConnectionInfo() requires permissions ACCESS_NETWORK_STATE and ACCESS_COARSE_LOCATION (runtime permission)

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