不支持即时应用 CLEARTEXT 通信：[]

Question

我尝试做HttpUrlConnection，但得到Exception：

    java.net.UnknownServiceException: CLEARTEXT communication not supported: []
    at com.android.okhttp.Connection.connect(Connection.java:149)
    at com.android.okhttp.Connection.connectAndSetOwner(Connection.java:185)
    at com.android.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:128)
    at com.android.okhttp.internal.http.HttpEngine.nextConnection(HttpEngine.java:341)
    at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:330)
    at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)
    at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:433)
    at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:114)
    at com.xfzj.instantappdemo2.feature.MainActivity$3.run(MainActivity.java:84)
    at java.lang.Thread.run(Thread.java:818)

这是我的代码：

new Thread(new Runnable() {
        @Override
        public void run() {
            try {
                URL url = new URL("http://www.google.com");
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                connection.connect();
                Log.i("responseCode",""+connection.getResponseCode());
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();

            }
        }
    }).start();

如果我运行并安装了应用程序，它就成功了。

或者我将http://www.google.com替换为https://www.google.com，在免安装应用中也运行成功了。

免安装应用只支持 Https 吗？

Answer 1

没错。不支持 HTTP 连接：https://developer.android.com/topic/instant-apps/policy.html#network_traffic。

Answer 2

将以下行添加到清单文件中

<application
    ...
    android:usesCleartextTraffic="true"
    ...
</application>