Java 如何删除致命异常:android中的AsyncTask
嗨 我正在使用gson库调用我的web服务,我遇到异常。我不知道为什么会出现这种情况。您能告诉我如何删除此错误吗 我会告诉你我所做的。。 1)Java 如何删除致命异常:android中的AsyncTask,java,android,android-asynctask,Java,Android,Android Asynctask,嗨 我正在使用gson库调用我的web服务,我遇到异常。我不知道为什么会出现这种情况。您能告诉我如何删除此错误吗 我会告诉你我所做的。。 1)主要活动 10-23 00:41:00.705: E/AndroidRuntime(3622): FATAL EXCEPTION: AsyncTask #1 10-23 00:41:00.705: E/AndroidRuntime(3622): java.lang.RuntimeException: An error occured while execu
主要活动
10-23 00:41:00.705: E/AndroidRuntime(3622): FATAL EXCEPTION: AsyncTask #1
10-23 00:41:00.705: E/AndroidRuntime(3622): java.lang.RuntimeException: An error occured while executing doInBackground()
10-23 00:41:00.705: E/AndroidRuntime(3622): at android.os.AsyncTask$3.done(AsyncTask.java:299)
10-23 00:41:00.705: E/AndroidRuntime(3622): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
10-23 00:41:00.705: E/AndroidRuntime(3622): at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
10-23 00:41:00.705: E/AndroidRuntime(3622): at java.util.concurrent.FutureTask.run(FutureTask.java:239)
10-23 00:41:00.705: E/AndroidRuntime(3622): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
10-23 00:41:00.705: E/AndroidRuntime(3622): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
10-23 00:41:00.705: E/AndroidRuntime(3622): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
10-23 00:41:00.705: E/AndroidRuntime(3622): at java.lang.Thread.run(Thread.java:856)
10-23 00:41:00.705: E/AndroidRuntime(3622): Caused by: java.lang.IllegalStateException: Content has been consumed
10-23 00:41:00.705: E/AndroidRuntime(3622): at org.apache.http.entity.BasicHttpEntity.getContent(BasicHttpEntity.java:84)
10-23 00:41:00.705: E/AndroidRuntime(3622): at org.apache.http.entity.BasicHttpEntity.writeTo(BasicHttpEntity.java:126)
10-23 00:41:00.705: E/AndroidRuntime(3622): at org.apache.http.entity.HttpEntityWrapper.writeTo(HttpEntityWrapper.java:101)
10-23 00:41:00.705: E/AndroidRuntime(3622): at org.apache.http.conn.BasicManagedEntity.writeTo(BasicManagedEntity.java:126)
10-23 00:41:00.705: E/AndroidRuntime(3622): at com.firstgroup.webservice.RequestTask.doInBackground(RequestTask.java:51)
10-23 00:41:00.705: E/AndroidRuntime(3622): at com.firstgroup.webservice.RequestTask.doInBackground(RequestTask.java:1)
10-23 00:41:00.705: E/AndroidRuntime(3622): at android.os.AsyncTask$2.call(AsyncTask.java:287)
10-23 00:41:00.705: E/AndroidRuntime(3622): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
10-23 00:41:00.705: E/AndroidRuntime(3622): ... 4 more
我有一个holder和RequestTask类来调用webservice并返回回调
public class Appliacationload extends Activity implements WebserviceCallBack{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.appliacationload);
/*WebserviceMethod callDepartudeDashboard=new WebserviceMethod();
callDepartudeDashboard.setObserver(this);
callDepartudeDashboard.getwebService(ConstantVariable.dashboardWebServiceURL+"a/"+"arrival"+"?crsCode=hnh");*/
RequestTask callWebService=new RequestTask();
callWebService.setObserver(this);
callWebService.execute(ConstantVariable.dashboardWebServiceURL+"a/"+"arrival"+"?crsCode=vic");
}
@Override
public void getWebserviceResponse(String response) {
// TODO Auto-generated method stub
Log.d("response", response);
}
}
而主要活动就是这样
public interface WebserviceCallBack {
public void getWebserviceResponse(InputStream result);
}
我得到了这个异常为什么..?我在回拨时发送输入流,并在主活动中在此生成
例外情况:
public class Appliacationload extends Activity implements WebserviceCallBack{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.appliacationload);
/*WebserviceMethod callDepartudeDashboard=new WebserviceMethod();
callDepartudeDashboard.setObserver(this);
callDepartudeDashboard.getwebService(ConstantVariable.dashboardWebServiceURL+"a/"+"arrival"+"?crsCode=hnh");*/
RequestTask callWebService=new RequestTask();
callWebService.setObserver(this);
callWebService.execute(ConstantVariable.dashboardWebServiceURL+"a/"+"arrival"+"?crsCode=vic");
}
@Override
public void getWebserviceResponse(InputStream result) {
// TODO Auto-generated method stub
Reader reader = new InputStreamReader(result);
Gson gson = new Gson();
Holder response1 = gson.fromJson(reader, Holder.class);
Log.d("-----", "naveen");
}
原因是您只能从
实体
消费内容
你在这里做了两次(也许你不知道)
这里呢
Reader reader = new InputStreamReader(response.getEntity().getContent());
我知道这听起来有点奇怪,但实际上writeTo()函数将从实体获取内容,以写入OutputStream
。您可以在文档中看到它
您可以使用的另一种解决方法是将其转换为字符串,并让GSON处理它
response.getEntity().writeTo(out);
我希望我的回答能帮助你 我知道你想说什么了。你能详细说明一下吗?你有你的gmail Id吗?请让我看看我的代码。这是一个小代码,但有这个问题。我知道了,但我没有什么问题。我更改了我的一些代码。然后期待再次出现。检查我的更新2min@PallaviSharma也许你需要打开一个新的问题:)我将创建一个新的一个如果你检查更新,如果你能解决,请udate anwser..谢谢
public class Appliacationload extends Activity implements WebserviceCallBack{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.appliacationload);
/*WebserviceMethod callDepartudeDashboard=new WebserviceMethod();
callDepartudeDashboard.setObserver(this);
callDepartudeDashboard.getwebService(ConstantVariable.dashboardWebServiceURL+"a/"+"arrival"+"?crsCode=hnh");*/
RequestTask callWebService=new RequestTask();
callWebService.setObserver(this);
callWebService.execute(ConstantVariable.dashboardWebServiceURL+"a/"+"arrival"+"?crsCode=vic");
}
@Override
public void getWebserviceResponse(InputStream result) {
// TODO Auto-generated method stub
Reader reader = new InputStreamReader(result);
Gson gson = new Gson();
Holder response1 = gson.fromJson(reader, Holder.class);
Log.d("-----", "naveen");
}
10-23 03:07:33.956: E/AndroidRuntime(22412): FATAL EXCEPTION: main
10-23 03:07:33.956: E/AndroidRuntime(22412): android.os.NetworkOnMainThreadException
10-23 03:07:33.956: E/AndroidRuntime(22412): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
10-23 03:07:33.956: E/AndroidRuntime(22412): at libcore.io.BlockGuardOs.recvfrom(BlockGuardOs.java:163)
10-23 03:07:33.956: E/AndroidRuntime(22412): at libcore.io.IoBridge.recvfrom(IoBridge.java:513)
10-23 03:07:33.956: E/AndroidRuntime(22412): at java.net.PlainSocketImpl.read(PlainSocketImpl.java:488)
10-23 03:07:33.956: E/AndroidRuntime(22412): at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:46)
10-23 03:07:33.956: E/AndroidRuntime(22412): at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:240)
10-23 03:07:33.956: E/AndroidRuntime(22412): at org.apache.http.impl.io.AbstractSessionInputBuffer.fillBuffer(AbstractSessionInputBuffer.java:103)
10-23 03:07:33.956: E/AndroidRuntime(22412): at org.apache.http.impl.io.AbstractSessionInputBuffer.read(AbstractSessionInputBuffer.java:134)
10-23 03:07:33.956: E/AndroidRuntime(22412): at org.apache.http.impl.io.ChunkedInputStream.read(ChunkedInputStream.java:161)
10-23 03:07:33.956: E/AndroidRuntime(22412): at org.apache.http.conn.EofSensorInputStream.read(EofSensorInputStream.java:159)
10-23 03:07:33.956: E/AndroidRuntime(22412): at java.io.InputStreamReader.read(InputStreamReader.java:244)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.google.gson.stream.JsonReader.fillBuffer(JsonReader.java:1298)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.google.gson.stream.JsonReader.nextQuotedValue(JsonReader.java:1028)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.google.gson.stream.JsonReader.nextName(JsonReader.java:796)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:178)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:81)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:95)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:183)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.google.gson.Gson.fromJson(Gson.java:805)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.google.gson.Gson.fromJson(Gson.java:743)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.firstgroup.applicationload.Appliacationload.getWebserviceResponse(Appliacationload.java:48)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.firstgroup.webservice.RequestTask.onPostExecute(RequestTask.java:77)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.firstgroup.webservice.RequestTask.onPostExecute(RequestTask.java:1)
10-23 03:07:33.956: E/AndroidRuntime(22412): at android.os.AsyncTask.finish(AsyncTask.java:631)
10-23 03:07:33.956: E/AndroidRuntime(22412): at android.os.AsyncTask.access$600(AsyncTask.java:177)
10-23 03:07:33.956: E/AndroidRuntime(22412): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
10-23 03:07:33.956: E/AndroidRuntime(22412): at android.os.Handler.dispatchMessage(Handler.java:99)
10-23 03:07:33.956: E/AndroidRuntime(22412): at android.os.Looper.loop(Looper.java:137)
10-23 03:07:33.956: E/AndroidRuntime(22412): at android.app.ActivityThread.main(ActivityThread.java:5041)
10-23 03:07:33.956: E/AndroidRuntime(22412): at java.lang.reflect.Method.invokeNative(Native Method)
10-23 03:07:33.956: E/AndroidRuntime(22412): at java.lang.reflect.Method.invoke(Method.java:511)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
10-23 03:07:33.956: E/AndroidRuntime(22412): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
10-23 03:07:33.956: E/AndroidRuntime(22412): at dalvik.system.NativeStart.main(Native Method)
Reader reader = new InputStreamReader(response.getEntity().getContent());
response.getEntity().writeTo(out);
@Override
protected String doInBackground(String... uri) {
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response;
String responseString = null;
try {
response = httpclient.execute(new HttpGet(uri[0]));
StatusLine statusLine = response.getStatusLine();
if(statusLine.getStatusCode() == HttpStatus.SC_OK){
responseString = EntityUtils.toString(response.getEntity()); // content will be consume only once
Gson gson = new Gson();
Holder response1 = gson.fromJson(responseString, Holder.class);
} else{
//Closes the connection.
response.getEntity().getContent().close();
throw new IOException(statusLine.getReasonPhrase());
}
} catch (ClientProtocolException e) {
//TODO Handle problems..\
progressDialog.hide();
} catch (IOException e) {
//TODO Handle problems..
progressDialog.hide();
}
return responseString;
}