我没有运气将代码从我的 PC 移动到 Android。我的代码在我的 PC 上运行但在我的 Android 手机上运行时遇到问题。我正在使用相同的库（GSON），我所做的一切对 Android 设备来说都不应该是问题。有人能帮我吗？
日志猫：
08-10 22:39:22.400: E/AndroidRuntime(29153): FATAL EXCEPTION: AsyncTask #1
08-10 22:39:22.400: E/AndroidRuntime(29153): java.lang.RuntimeException: An error occured while executing doInBackground()
08-10 22:39:22.400: E/AndroidRuntime(29153): at android.os.AsyncTask$3.done(AsyncTask.java:278)
08-10 22:39:22.400: E/AndroidRuntime(29153): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
08-10 22:39:22.400: E/AndroidRuntime(29153): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
08-10 22:39:22.400: E/AndroidRuntime(29153): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
08-10 22:39:22.400: E/AndroidRuntime(29153): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-10 22:39:22.400: E/AndroidRuntime(29153): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
08-10 22:39:22.400: E/AndroidRuntime(29153): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-10 22:39:22.400: E/AndroidRuntime(29153): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
08-10 22:39:22.400: E/AndroidRuntime(29153): at java.lang.Thread.run(Thread.java:856)
08-10 22:39:22.400: E/AndroidRuntime(29153): Caused by: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected a string but was BEGIN_OBJECT at line 1 column 2
08-10 22:39:22.400: E/AndroidRuntime(29153): at com.google.gson.Gson.fromJson(Gson.java:806)
08-10 22:39:22.400: E/AndroidRuntime(29153): at com.google.gson.Gson.fromJson(Gson.java:761)
08-10 22:39:22.400: E/AndroidRuntime(29153): at com.google.gson.Gson.fromJson(Gson.java:710)
08-10 22:39:22.400: E/AndroidRuntime(29153): at com.g4apps.json.android.verification.client.JsonVerificationClass.jsonVerificationCall(JsonVerificationClass.java:73)
08-10 22:39:22.400: E/AndroidRuntime(29153): at com.g4apps.json.android.verification.client.MainActivity$SmpProcessor.doInBackground(MainActivity.java:45)
08-10 22:39:22.400: E/AndroidRuntime(29153): at com.g4apps.json.android.verification.client.MainActivity$SmpProcessor.doInBackground(MainActivity.java:1)
08-10 22:39:22.400: E/AndroidRuntime(29153): at android.os.AsyncTask$2.call(AsyncTask.java:264)
08-10 22:39:22.400: E/AndroidRuntime(29153): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
08-10 22:39:22.400: E/AndroidRuntime(29153): ... 5 more
08-10 22:39:22.400: E/AndroidRuntime(29153): Caused by: java.lang.IllegalStateException: Expected a string but was BEGIN_OBJECT at line 1 column 2
08-10 22:39:22.400: E/AndroidRuntime(29153): at com.google.gson.stream.JsonReader.nextString(JsonReader.java:464)
08-10 22:39:22.400: E/AndroidRuntime(29153): at com.google.gson.internal.bind.TypeAdapters$13.read(TypeAdapters.java:349)
08-10 22:39:22.400: E/AndroidRuntime(29153): at com.google.gson.internal.bind.TypeAdapters$13.read(TypeAdapters.java:337)
08-10 22:39:22.400: E/AndroidRuntime(29153): at com.google.gson.Gson.fromJson(Gson.java:795)
08-10 22:39:22.400: E/AndroidRuntime(29153): ... 12 more
我的课：
package com.g4apps.json.android.verification.client;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import com.google.gson.*;
import com.google.gson.reflect.TypeToken;
// The Return class defines the structure of the json object returned by the web service
public class JsonVerificationClass {
public static class VerificationData {
private String Name;
private String Phone;
public VerificationData (String name, String smartphone){
this.Name=name;
this.Phone=smartphone;
}
public String getName() { return Name; }
public String getSmartPhone() { return Phone; }
}
// jsonCall is the actual call to the webservice
public static String jsonVerificationCall(URI url, String app, VerificationData data) {
try {
//We need to json objects. One for the request and one for the response
//The request object is simple and doesn't require an object class to define it.
Gson json = new Gson();
String jsondata= json.toJson(data);
// We use the same HttpClient and HttpPost commands in both the PC and Android versions.
// These libraries are included in the Android SDK but must be added for the PC.
HttpClient client = new DefaultHttpClient();
HttpPost post2 = new HttpPost(url);
// We use list to List to make the Post Entities
List<NameValuePair> namevaluePairs = new ArrayList<NameValuePair>(1);
namevaluePairs.add(new BasicNameValuePair("app",app));
namevaluePairs.add(new BasicNameValuePair("data",jsondata.toString()));
//System.out.println(namevaluePairs.toString());
post2.setEntity(new UrlEncodedFormEntity(namevaluePairs));
HttpResponse response = client.execute(post2);
//Read in the response and rebuild the json string
BufferedReader rd= new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuilder myresponse = new StringBuilder();
String inputline;
while((inputline = rd.readLine()) !=null) myresponse.append(inputline);
//Get the type from Return Object so we can remove it from the Json String
java.lang.reflect.Type StringType = new TypeToken<String>(){}.getType();
rd.close();
//System.out.println(myresponse.toString());
String return2= new Gson().fromJson(myresponse.toString(), StringType);
return return2;
}
catch (UnsupportedEncodingException uee) {
uee.printStackTrace();
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
我的活动：
package com.g4apps.json.android.verification.client;
import java.net.URI;
import java.net.URISyntaxException;
import com.g4apps.json.android.verification.client.JsonVerificationClass;
import com.g4apps.json.android.verification.client.JsonVerificationClass.VerificationData;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;
public class MainActivity extends Activity {
private TextView tv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView)findViewById(R.id.TextView01);
//Start new task and run SmpProcessor (Android 2.3+ prohibits Networking activities from running in main thread.
SmpProcessor task = new SmpProcessor();
task.execute();
}
// added asynctask though other thread methods can be used
private class SmpProcessor extends AsyncTask <Void,Void,String> {
// doInBackground sets up variables and calls jsonCall. multiple to jsoncall can be made from the same thread.
@Override
protected String doInBackground(Void... voids){ //String[] doInBackground(Void... voids){
try {
URI url = new URI("http://myservice.com/webservices.php");
String app="verify";
VerificationData data = new VerificationData("Sam","9055551212");
// Make jsonCall with will return Return Object
String result = JsonVerificationClass.jsonVerificationCall(url,app,data);
return result;
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//return null;
return null;
}
// Handled the retrieval of the data in onPostExecute so I could output it to the android device through the MainActivity.
protected void onPostExecute(String result) {
tv.setText("Response: " + result);
// Handle or call processing for data here as it needs to be done post html call.
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}