android 应用程序在重启时崩溃 java.net.UnknownHostException：无法解析主机

Question

当我重新启动我的设备时，我的应用程序崩溃了，很难调试，我搜索的内容是说要添加我在清单中的互联网权限我不知道该怎么做，可以吗任何人请指导我。

02-24 17:37:05.750: I/System.out(5201): onErrorResponse:com.android.volley.NoConnectionError: java.net.UnknownHostException: Unable to resolve host "eventiapp.com": No address associated with hostname
    02-24 17:37:05.750: W/System.err(5201): com.android.volley.NoConnectionError: java.net.UnknownHostException: Unable to resolve host "eventiapp.com": No address associated with hostname
    02-24 17:37:05.750: W/System.err(5201):     at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:133)
    02-24 17:37:05.750: W/System.err(5201):     at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:105)
    02-24 17:37:05.750: W/System.err(5201): Caused by: java.net.UnknownHostException: Unable to resolve host "eventiapp.com": No address associated with hostname
    02-24 17:37:05.755: W/System.err(5201):     at java.net.InetAddress.lookupHostByName(InetAddress.java:424)
    02-24 17:37:05.755: W/System.err(5201):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
    02-24 17:37:05.755: W/System.err(5201):     at java.net.InetAddress.getAllByName(InetAddress.java:214)
    02-24 17:37:05.755: W/System.err(5201):     at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
    02-24 17:37:05.755: W/System.err(5201):     at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
    02-24 17:37:05.755: W/System.err(5201):     at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
    02-24 17:37:05.755: W/System.err(5201):     at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
    02-24 17:37:05.755: W/System.err(5201):     at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
    02-24 17:37:05.755: W/System.err(5201):     at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:315)
    02-24 17:37:05.755: W/System.err(5201):     at libcore.net.http.HttpEngine.connect(HttpEngine.java:310)
    02-24 17:37:05.755: W/System.err(5201):     at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:289)
    02-24 17:37:05.755: W/System.err(5201):     at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:239)
    02-24 17:37:05.755: W/System.err(5201):     at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80)
    02-24 17:37:05.755: W/System.err(5201):     at libcore.net.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:188)
    02-24 17:37:05.755: W/System.err(5201):     at com.android.volley.toolbox.HurlStack.addBodyIfExists(HurlStack.java:227)
    02-24 17:37:05.755: W/System.err(5201):     at com.android.volley.toolbox.HurlStack.setConnectionParametersForRequest(HurlStack.java:210)
    02-24 17:37:05.755: W/System.err(5201):     at com.android.volley.toolbox.HurlStack.performRequest(HurlStack.java:106)
    02-24 17:37:05.755: W/System.err(5201):     at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:93)
    02-24 17:37:05.755: W/System.err(5201):     ... 1 more
    02-24 17:37:05.755: W/System.err(5201): Caused by: libcore.io.GaiException: getaddrinfo failed: EAI_NODATA (No address associated with hostname)
    02-24 17:37:05.760: W/System.err(5201):     at libcore.io.Posix.getaddrinfo(Native Method)
    02-24 17:37:05.770: W/System.err(5201):     at libcore.io.ForwardingOs.getaddrinfo(ForwardingOs.java:55)
    02-24 17:37:05.770: W/System.err(5201):     at java.net.InetAddress.lookupHostByName(InetAddress.java:405)
    02-24 17:37:05.770: W/System.err(5201):     ... 18 more
    02-24 17:37:05.770: W/System.err(5201): Caused by: libcore.io.ErrnoException: getaddrinfo failed: ENETUNREACH (Network is unreachable)
    02-24 17:37:05.775: W/System.err(5201):     ... 21 more##

Answer 1

在创建 http 请求之前是否检查网络连接，如下所示：

ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
return netInfo != null && netInfo.isConnectedOrConnecting();

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