您好我尝试使用Android从Web服务读取任何数据 但每一次我都会遇到一个问题
今天我尝试从3schools网站上阅读网络服务
使用此代码
package com.example.lo2i03;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
//import org.ksoap2.serialization.SoapPrimitive;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
public class MainActivity extends Activity {
private static String SOAP_ACTION = "http://tempuri.org/CelsiusToFahrenheit";
private static String NAMESPACE = "http://tempuri.org/";
private static String METHOD_NAME = "CelsiusToFahrenheit";
private static String URL = "http://www.w3schools.com/webservices/tempconvert.asmx?WSDL";
TextView tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView)findViewById(R.id.txt);
SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
request.addProperty("Celsius","32");
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER12);
envelope.setOutputSoapObject(request);
envelope.dotNet = true;
try
{
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
androidHttpTransport.call(SOAP_ACTION, envelope);
SoapObject result = (SoapObject)envelope.getResponse();
tv.setText(result.getProperty(0).toString());
}
catch (Exception e)
{
tv.setText("Error");
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
知道我添加了显示访问Internet的权限
清单文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.lo2i03"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="16" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.lo2i03.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
</manifest>
Android版：4.2 - 4.2
11-24 01:28:29.065: E/Trace(13408): error opening trace file: No such file or directory (2)
11-24 01:28:29.195: D/AndroidRuntime(13408): Shutting down VM
11-24 01:28:29.195: W/dalvikvm(13408): threadid=1: thread exiting with uncaught exception (group=0x412862a0)
11-24 01:28:29.195: E/AndroidRuntime(13408): FATAL EXCEPTION: main
11-24 01:28:29.195: E/AndroidRuntime(13408): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.lo2i03/com.example.lo2i03.MainActivity}: android.os.NetworkOnMainThreadException
11-24 01:28:29.195: E/AndroidRuntime(13408): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100)
11-24 01:28:29.195: E/AndroidRuntime(13408): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
11-24 01:28:29.195: E/AndroidRuntime(13408): at android.app.ActivityThread.access$600(ActivityThread.java:140)
11-24 01:28:29.195: E/AndroidRuntime(13408): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
11-24 01:28:29.195: E/AndroidRuntime(13408): at android.os.Handler.dispatchMessage(Handler.java:99)
11-24 01:28:29.195: E/AndroidRuntime(13408): at android.os.Looper.loop(Looper.java:137)
11-24 01:28:29.195: E/AndroidRuntime(13408): at android.app.ActivityThread.main(ActivityThread.java:4898)
11-24 01:28:29.195: E/AndroidRuntime(13408): at java.lang.reflect.Method.invokeNative(Native Method)
11-24 01:28:29.195: E/AndroidRuntime(13408): at java.lang.reflect.Method.invoke(Method.java:511)
11-24 01:28:29.195: E/AndroidRuntime(13408): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008)
11-24 01:28:29.195: E/AndroidRuntime(13408): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775)
11-24 01:28:29.195: E/AndroidRuntime(13408): at dalvik.system.NativeStart.main(Native Method)
11-24 01:28:29.195: E/AndroidRuntime(13408): Caused by: android.os.NetworkOnMainThreadException
11-24 01:28:29.195: E/AndroidRuntime(13408): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1118)
11-24 01:28:29.195: E/AndroidRuntime(13408): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
11-24 01:28:29.195: E/AndroidRuntime(13408): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
11-24 01:28:29.195: E/AndroidRuntime(13408): at java.net.InetAddress.getAllByName(InetAddress.java:214)
11-24 01:28:29.195: E/AndroidRuntime(13408): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
11-24 01:28:29.195: E/AndroidRuntime(13408): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
11-24 01:28:29.195: E/AndroidRuntime(13408): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
11-24 01:28:29.195: E/AndroidRuntime(13408): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
11-24 01:28:29.195: E/AndroidRuntime(13408): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
11-24 01:28:29.195: E/AndroidRuntime(13408): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:315)
11-24 01:28:29.195: E/AndroidRuntime(13408): at libcore.net.http.HttpEngine.connect(HttpEngine.java:310)
11-24 01:28:29.195: E/AndroidRuntime(13408): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:289)
11-24 01:28:29.195: E/AndroidRuntime(13408): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:239)
11-24 01:28:29.195: E/AndroidRuntime(13408): at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80)
11-24 01:28:29.195: E/AndroidRuntime(13408): at org.ksoap2.transport.ServiceConnectionSE.connect(ServiceConnectionSE.java:76)
11-24 01:28:29.195: E/AndroidRuntime(13408): at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:146)
11-24 01:28:29.195: E/AndroidRuntime(13408): at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:95)
11-24 01:28:29.195: E/AndroidRuntime(13408): at com.example.lo2i03.MainActivity.onCreate(MainActivity.java:35)
11-24 01:28:29.195: E/AndroidRuntime(13408): at android.app.Activity.performCreate(Activity.java:5191)
11-24 01:28:29.195: E/AndroidRuntime(13408): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
11-24 01:28:29.195: E/AndroidRuntime(13408): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
11-24 01:28:29.195: E/AndroidRuntime(13408): ... 11 more
NEW LOGCAT（1.0）
11-24 16:28:28.850: E/Trace(25195): error opening trace file: No such file or directory (2)
11-24 16:28:28.995: D/libEGL(25195): loaded /system/lib/egl/libEGL_mali.so
11-24 16:28:28.995: D/libEGL(25195): loaded /system/lib/egl/libGLESv1_CM_mali.so
11-24 16:28:29.000: D/libEGL(25195): loaded /system/lib/egl/libGLESv2_mali.so
11-24 16:28:29.000: D/(25195): Device driver API match
11-24 16:28:29.000: D/(25195): Device driver API version: 10
11-24 16:28:29.000: D/(25195): User space API version: 10
11-24 16:28:29.000: D/(25195): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Wed Sep 12 17:53:53 KST 2012
11-24 16:28:29.030: D/OpenGLRenderer(25195): Enabling debug mode 0
11-24 16:28:31.215: D/dalvikvm(25195): GC_CONCURRENT freed 214K, 10% free 12330K/13575K, paused 13ms+13ms, total 40ms
11-24 16:28:39.615: W/IInputConnectionWrapper(25195): getSelectedText on inactive InputConnection
11-24 16:28:39.615: W/IInputConnectionWrapper(25195): setComposingText on inactive InputConnection
11-24 16:28:39.615: W/IInputConnectionWrapper(25195): getExtractedText on inactive InputConnection
了解我使用（WiFi）访问互联网的知识。
任何建议？
答案 0 :(得分：2)
NetworkOnMainThreadException意味着您在UI线程中运行http请求代码。
尝试这样的事情：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView)findViewById(R.id.txt);
final SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
request.addProperty("Celsius","32");
final SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER12);
envelope.setOutputSoapObject(request);
envelope.dotNet = true;
new AsyncTask<Void, Void, Boolean>() {
SoapObject obj;
@Override
protected Boolean doInBackground(Void... params) {
//here you can do your background network job
try
{
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
androidHttpTransport.call(SOAP_ACTION, envelope);
obj = (SoapObject)envelope.getResponse();
return true;
}
catch (Exception e)
{
e.printStackTrace();
return false;
}
}
@Override
protected void onPostExecute(Boolean result) {
//here you can do your UI job
if (!result)
tv.setText("Error");
else
tv.setText(obj.getProperty(0).toString());
super.onPostExecute(result);
}
}.execute();
}
答案 1 :(得分：1)
尝试：
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope. dotNet= true;
envelope.setOutputSoapObject(request);
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
try {
androidHttpTransport.call(SOAP_ACTION, envelope);
SoapPrimitive result = (SoapPrimitive) envelope.getResponse();
String r = result.toString();
return r;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (XmlPullParserException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
如果你需要返回对象或arraylist，我可以发布解决方案......
答案 2 :(得分：1)
从soap webservice获取对象：
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope. dotNet= true;
envelope.setOutputSoapObject(request);
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
try {
androidHttpTransport.call(SOAP_VERATENDIMENTO, envelope);
SoapObject result = (SoapObject) envelope.getResponse();
YourClass yourClass = new YourClass();
if (result == null){
return null;
} else {
yourClass.setName(result.getProperty("name").toString());
yourClass.setEmail(result.getProperty("email").toString());
return yourClass;
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (XmlPullParserException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
返回arraylist do：
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope. dotNet= true;
envelope.setOutputSoapObject(request);
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
try {
androidHttpTransport.call(SOAP_VERMENSAGENS, envelope);
SoapObject result = (SoapObject) envelope.getResponse();
List<YourClassObject> yourList = new ArrayList<YourClassObject>();
if (result == null){
return null;
} else {
for(int i =0; i < result.getPropertyCount(); i++){
SoapObject soap = (SoapObject) result.getProperty(i);
YourClassObject yourClass = new YourClassObject();
yourClass.setName(soap.getProperty("name").toString()));
yourClass.setEmail(soap.getProperty("email").toString()));
yourList.add(yourClass);
}
return yourList;
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (XmlPullParserException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
答案 3 :(得分：1)
在清单文件中为互联网添加权限
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
然后在你的Activity上你运行你的http请求在setContentView之前添加这些行
setContentView(R.layout.activity_profile);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}