I've created an app that loads a question from my web services, and it works fine. But, sometimes it crashes and I do not get the reason why this is happening, especially because I have also given it the required permissions. It works fine, but at random, it crashes and gives me this report.
我创建了一个应用程序，它可以从我的web服务中加载一个问题，而且它运行良好。但是，有时它会崩溃，我不知道为什么会发生这种情况，特别是因为我还提供了所需的权限。它运行良好，但随机地，它崩溃并给我这个报告。
private void sendContinentQuestions(int id) {
// TODO Auto-generated method stub
//Get the data (see above)
JSONArray json = getJSONfromURL(id);
try{
for(int i=0; i < json.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
JSONObject jObject = json.getJSONObject(i);
longitude":"72.5660200"
String category_id = jObject.getString("category_id");
String question_id = jObject.getString("question_id");
String question_name = jObject.getString("question_name");
String latitude = jObject.getString("latitude");
String longitude = jObject.getString("longitude");
String answer = jObject.getString("answer");
String ansLatLng = latitude+"|"+longitude ;
Log.v("## data:: ###",question_id+"--"+question_name+"-cat id-"+category_id+"--ansLatLng "+ansLatLng+" answer: "+answer);
all_question.add(new QuestionData(game_id,category_id,question_id,question_name,ansLatLng,answer));
}
}catch(JSONException e) {
Log.e("log_tag", "Error parsing data "+e.toString());
}
}
}
public JSONArray getJSONfromURL(int id){
String response = "";
URL url;
try {
url = new URL(Consts.GET_URL+"index.php/Api/getQuestion?cat_id="+id);
HttpURLConnection http = (HttpURLConnection) url.openConnection();
http.setRequestMethod("POST");
InputStream is = http.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
response = br.readLine();
Log.v("###Response :: ###",response);
http.disconnect();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}catch (ProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//try parse the string to a JSON object
JSONArray jArray = null;
try{
jArray = new JSONArray(response);
}catch(JSONException e){
Log.e("log_tag", "Error parsing data "+e.toString());
}
return jArray;
}
11-13 15:02:52.307: W/System.err(8012): java.net.UnknownHostException: Unable to resolve host "www.xyz.com": No address associated with hostname
11-13 15:02:52.317: W/System.err(8012): at java.net.InetAddress.lookupHostByName(InetAddress.java:424)
11-13 15:02:52.317: W/System.err(8012): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
11-13 15:02:52.317: W/System.err(8012): at java.net.InetAddress.getAllByName(InetAddress.java:214)
11-13 15:02:52.317: W/System.err(8012): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
11-13 15:02:52.317: W/System.err(8012): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
11-13 15:02:52.317: W/System.err(8012): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
11-13 15:02:52.317: W/System.err(8012): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
11-13 15:02:52.317: W/System.err(8012): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
11-13 15:02:52.317: W/System.err(8012): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
11-13 15:02:52.317: W/System.err(8012): at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
11-13 15:02:52.317: W/System.err(8012): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
11-13 15:02:52.317: W/System.err(8012): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
11-13 15:02:52.317: W/System.err(8012): at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:282)
11-13 15:02:52.317: W/System.err(8012): at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:177)
11-13 15:02:52.327: W/System.err(8012): at com.abc.xyz.ContinentActivity.getJSONfromURL(ContinentActivity.java:400)
11-13 15:02:52.327: W/System.err(8012): at com.abc.xyz.ContinentActivity.sendContinentQuestions(ContinentActivity.java:327)
11-13 15:02:52.327: W/System.err(8012): at com.abc.xyz.ContinentActivity.access$2(ContinentActivity.java:323)
11-13 15:02:52.327: W/System.err(8012): at com.abc.xyz.ContinentActivity$LoadQuestions.doInBackground(ContinentActivity.java:254)
11-13 15:02:52.327: W/System.err(8012): at com.abc.xyz.ContinentActivity$LoadQuestions.doInBackground(ContinentActivity.java:1)
11-13 15:02:52.327: W/System.err(8012): at android.os.AsyncTask$2.call(AsyncTask.java:287)
11-13 15:02:52.327: W/System.err(8012): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
11-13 15:02:52.327: W/System.err(8012): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
11-13 15:02:52.327: W/System.err(8012): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
11-13 15:02:52.337: W/System.err(8012): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
11-13 15:02:52.337: W/System.err(8012): at java.lang.Thread.run(Thread.java:841)
11-13 15:02:52.337: W/System.err(8012): Caused by: libcore.io.GaiException: getaddrinfo failed: EAI_NODATA (No address associated with hostname)
11-13 15:02:52.337: W/System.err(8012): at libcore.io.Posix.getaddrinfo(Native Method)
11-13 15:02:52.337: W/System.err(8012): at libcore.io.ForwardingOs.getaddrinfo(ForwardingOs.java:61)
11-13 15:02:52.337: W/System.err(8012): at java.net.InetAddress.lookupHostByName(InetAddress.java:405)
11-13 15:02:52.337: W/System.err(8012): ... 24 more
11-13 15:02:52.337: E/log_tag(8012): Error parsing data org.json.JSONException: End of input at character 0 of
11-13 15:02:52.337: W/dalvikvm(8012): threadid=194: thread exiting with uncaught exception (group=0x417c1700)
11-13 15:02:52.337: E/AndroidRuntime(8012): FATAL EXCEPTION: AsyncTask #5
11-13 15:02:52.337: E/AndroidRuntime(8012): java.lang.RuntimeException: An error occured while executing doInBackground()
11-13 15:02:52.337: E/AndroidRuntime(8012): at android.os.AsyncTask$3.done(AsyncTask.java:299)
11-13 15:02:52.337: E/AndroidRuntime(8012): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
11-13 15:02:52.337: E/AndroidRuntime(8012): at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
11-13 15:02:52.337: E/AndroidRuntime(8012): at java.util.concurrent.FutureTask.run(FutureTask.java:239)
11-13 15:02:52.337: E/AndroidRuntime(8012): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
11-13 15:02:52.337: E/AndroidRuntime(8012): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
11-13 15:02:52.337: E/AndroidRuntime(8012): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
11-13 15:02:52.337: E/AndroidRuntime(8012): at java.lang.Thread.run(Thread.java:841)
11-13 15:02:52.337: E/AndroidRuntime(8012): Caused by: java.lang.NullPointerException
11-13 15:02:52.337: E/AndroidRuntime(8012): at com.abc.xyz.ContinentActivity.sendContinentQuestions(ContinentActivity.java:328)
11-13 15:02:52.337: E/AndroidRuntime(8012): at com.abc.xyz.ContinentActivity.access$2(ContinentActivity.java:323)
11-13 15:02:52.337: E/AndroidRuntime(8012): at com.abc.xyz.ContinentActivity$LoadQuestions.doInBackground(ContinentActivity.java:254)
11-13 15:02:52.337: E/AndroidRuntime(8012): at com.abc.xyz.ContinentActivity$LoadQuestions.doInBackground(ContinentActivity.java:1)
11-13 15:02:52.337: E/AndroidRuntime(8012): at android.os.AsyncTask$2.call(AsyncTask.java:287)
11-13 15:02:52.337: E/AndroidRuntime(8012): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
6 个解决方案
#1
108
I encountered this problem too, reconnecting the WiFi can solve this.
我也遇到了这个问题，重新连接WiFi可以解决这个问题。
For us ,we can check if the phone can resolve the host to IP when we start application. If it cannot resolve, tell the user to check the WiFi and then exit.
对于我们来说，我们可以检查手机是否可以在我们开始应用程序时解析主机到IP。如果不能解决，告诉用户检查WiFi，然后退出。
I hope it helps.
我希望它有帮助。
#2
7
I had the same exception in the simulator (Android Studio on OSX) but connecting to the same URL on the iOS simulator worked fine... Looks like it all stemmed from the fact I'd be running the simulator whilst connected to a personal hotspot for my internet connection and then came back later while connected to wifi and the simulator didn't like the new internet connection for some reason, seems like it thought the old hotspot was the current connection, which was no longer working..
我在模拟器上也有同样的例外(OSX上的Android Studio)，但在iOS模拟器上连接到同一个URL，效果很好……看起来一切都源于事实我会运行模拟器同时连接到一个个人热点为我的网络连接,然后回来之后而连接到wifi和模拟器不喜欢新的互联网连接由于某种原因,似乎认为旧的热点是当前连接,这不再是工作. .
Closing and relaunching the simulator worked!
关闭和重新启动模拟器工作!
#3
4
I got the same error and the issue was that I was on VPN and I didn't realize it. After disconnecting from the VPN and reconnecting to my WIFI network, the problem was resolved.
我犯了同样的错误，问题是我在VPN上，我没有意识到。在断开VPN连接并重新连接到我的WIFI网络后，问题解决了。
#4
2
Missed to configure tag in manifest file
未能在manifest文件中配置标记。
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
#5
1
If reconnecting the WiFi doesn't work for you, try reboot your device.
如果重新连接WiFi不适合你，尝试重启你的设备。
This works for me. Hope it helps.
这适合我。希望它可以帮助。
#6
0
I encountered this error when running my Android app on my home WiFi, then trying to run it on different WiFi without closing my simulator.
我在家里的WiFi上运行Android应用程序时遇到了这个错误，然后尝试在不同的WiFi上运行，而不关闭模拟器。
Simply closing the simulator and re-launching the app worked for me!
简单地关闭模拟器，重新启动应用程序为我工作!
#1
108
I encountered this problem too, reconnecting the WiFi can solve this.
我也遇到了这个问题，重新连接WiFi可以解决这个问题。
For us ,we can check if the phone can resolve the host to IP when we start application. If it cannot resolve, tell the user to check the WiFi and then exit.
对于我们来说，我们可以检查手机是否可以在我们开始应用程序时解析主机到IP。如果不能解决，告诉用户检查WiFi，然后退出。
I hope it helps.
我希望它有帮助。
#2
7
I had the same exception in the simulator (Android Studio on OSX) but connecting to the same URL on the iOS simulator worked fine... Looks like it all stemmed from the fact I'd be running the simulator whilst connected to a personal hotspot for my internet connection and then came back later while connected to wifi and the simulator didn't like the new internet connection for some reason, seems like it thought the old hotspot was the current connection, which was no longer working..
我在模拟器上也有同样的例外(OSX上的Android Studio)，但在iOS模拟器上连接到同一个URL，效果很好……看起来一切都源于事实我会运行模拟器同时连接到一个个人热点为我的网络连接,然后回来之后而连接到wifi和模拟器不喜欢新的互联网连接由于某种原因,似乎认为旧的热点是当前连接,这不再是工作. .
Closing and relaunching the simulator worked!
关闭和重新启动模拟器工作!
#3
4
I got the same error and the issue was that I was on VPN and I didn't realize it. After disconnecting from the VPN and reconnecting to my WIFI network, the problem was resolved.
我犯了同样的错误，问题是我在VPN上，我没有意识到。在断开VPN连接并重新连接到我的WIFI网络后，问题解决了。
#4
2
Missed to configure tag in manifest file
未能在manifest文件中配置标记。
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
#5
1
If reconnecting the WiFi doesn't work for you, try reboot your device.
如果重新连接WiFi不适合你，尝试重启你的设备。
This works for me. Hope it helps.
这适合我。希望它可以帮助。
#6
0
I encountered this error when running my Android app on my home WiFi, then trying to run it on different WiFi without closing my simulator.
我在家里的WiFi上运行Android应用程序时遇到了这个错误，然后尝试在不同的WiFi上运行，而不关闭模拟器。
Simply closing the simulator and re-launching the app worked for me!
简单地关闭模拟器，重新启动应用程序为我工作!