Question

我正在尝试将我的Android应用程序连接到网站。我使用的代码在Java中工作，所以这不是问题。我试过在这里寻找解决方案，但似乎没有任何效果。我试过了：

1）向清单添加互联网权限

2）将代码放在新线程上，因为主UI线程上显然不允许网络连接。

3）试图摆弄模拟器上的wifi选项

我不可避免地遇到异常：“引起：android.system.GaiException：android_getaddrinfo失败：EAI_NODATA（没有与主机名关联的地址）”

这是我的代码段：

private void getPriceFromWeb() {
    final String priceStr;
    double priceDouble;
    Document website = null;
    try {
        website = Jsoup.connect("https://blockchain.info/ticker").ignoreContentType(true).get();

    } catch (Exception e) {
        e.printStackTrace();
        System.out.println("EXCEPTION!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
    }

我现在不知所措。欢迎任何建议。再一次，如果我将它作为普通的java程序运行，实际的代码可以工作，但是不能用作android应用程序。这非常令人沮丧。

这是堆栈跟踪：

 I/OpenGLRenderer: Initialized EGL, version 1.4
 D/OpenGLRenderer: Swap behavior 1
 W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
 D/OpenGLRenderer: Swap behavior 0
 W/art: Before Android 4.1, method int android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
 D/NetworkSecurityConfig: No Network Security Config specified, using platform default
 W/System.err: java.net.UnknownHostException: Unable to resolve host "blockchain.info": No address associated with hostname
 W/System.err:     at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:125)
 W/System.err:     at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:74)
 W/System.err:     at java.net.InetAddress.getAllByName(InetAddress.java:752)
 W/System.err:     at com.android.okhttp.internal.Network$1.resolveInetAddresses(Network.java:29)
 W/System.err:     at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:187)
 W/System.err:     at com.android.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:156)
 W/System.err:     at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:98)
 W/System.err:     at com.android.okhttp.internal.http.HttpEngine.createNextConnection(HttpEngine.java:345)
 W/System.err:     at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:328)
 W/System.err:     at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:246)
 W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:457)
 W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:126)
 W/System.err:     at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.connect(DelegatingHttpsURLConnection.java:89)
 W/System.err:     at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java)
 W/System.err:     at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:652)
 W/System.err:     at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:629)
 W/System.err:     at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:261)
 W/System.err:     at org.jsoup.helper.HttpConnection.get(HttpConnection.java:250)
 W/System.err:     at com.example.Unutuku.paymenrequestqr.QRrequest.getPriceFromWeb(QRrequest.java:59)
 W/System.err:     at com.example.Unutuku.paymenrequestqr.QRrequest.access$000(QRrequest.java:19)
 W/System.err:     at com.example.Unutuku.paymenrequestqr.QRrequest$2.run(QRrequest.java:47)
 W/System.err:     at java.lang.Thread.run(Thread.java:761)
 W/System.err: Caused by: android.system.GaiException: android_getaddrinfo failed: EAI_NODATA (No address associated with hostname)
 W/System.err:     at libcore.io.Posix.android_getaddrinfo(Native Method)
 W/System.err:     at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:55)
 W/System.err:     at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:106)
 W/System.err:  ... 21 more
 I/System.out: EXCEPTION!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Android应用程序无法从网站提取信息，抛出异常

0 个答案: