我对 Android 开发相当陌生，我正在尝试创建一个应用程序来显示清单列表以供验证。
因为我是新手，所以我按照“.NET 开发人员的 OData 编程手册”一书中的示例开发了这个应用程序的原型。我已经测试了书中（第 5 章）中的示例（它工作正常），但由于某种原因它崩溃了。
我怀疑这可能与我的 WCF OData 服务有关。它是在实体框架中开发的，并托管在我的本地 PC 上，即 http:192.168.0.105:8090/PODDataService.svc。
根据本书的示例，我还创建了 2 个映射类，因为该应用程序仅与 2 个 OData 实体交互。
以下是我用来构建项目的 6 个类：
package com.podcheck;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.core4j.Enumerable;
import org.odata4j.consumer.ODataConsumer;
import org.odata4j.core.OEntity;
import org.odata4j.core.OLink;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ListView;
public class MainActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ListView lvManifests = (ListView)findViewById(R.id.lvManifests);
// Add item click action listener
lvManifests.setOnItemClickListener(
new ManifestListItemClickListener(this)
);
// Populate category items on lstCategory
ArrayList<ManifestObj> manifestList = GetManifestItems();
ManifestsAdapter mAdapter = new ManifestsAdapter(this, R.layout.list_item, manifestList);
lvManifests.setAdapter(mAdapter);
}
// Query Category list from Northwind based WCF DataService
ArrayList<ManifestObj> GetManifestItems()
{
String svcUri = "http://192.168.0.105:8090/PODDataService.svc/";
ODataConsumer c = ODataConsumer.create(svcUri);
ArrayList<ManifestObj> manifestList = new ArrayList<ManifestObj>();
Enumerable<OEntity> cursor = c.getEntities("Manifests").expand("ManifestItems").execute();
for (OEntity entityObj : cursor)
{
ManifestObj mObj = new ManifestObj();
mObj.ManifestID = entityObj.getProperty("ManifestID", Integer.class).getValue();
mObj.ManifestCode = entityObj.getProperty("ManifestCode", String.class).getValue();
mObj.ManifestDate = entityObj.getProperty("ManifestDate", Date.class).getValue();
Date date = new Date();
if(mObj.ManifestDate == date)
{
List<OEntity> entityList = entityObj.getLink("ManifestItems", OLink.class).getRelatedEntities();
mObj.ManifestItems = new ArrayList<ManifestItemObj>();
for(OEntity pEntity: entityList)
{
ManifestItemObj miObj = new ManifestItemObj();
miObj.JobType = pEntity.getProperty("JobType", String.class).getValue();
miObj.FKID = pEntity.getProperty("FKID", Integer.class).getValue();
//miObj.SupplierID = pEntity.getProperty("SupplierID", Integer.class).getValue();
//miObj.UnitPrice = pEntity.getProperty("UnitPrice", BigDecimal.class).getValue();
mObj.ManifestItems.add(miObj);
}
manifestList.add(mObj);
}
}
return manifestList;
}
public void ShowItemsOfManifest(ManifestObj manifest)
{
Bundle bundle = new Bundle();
Intent newIntent = new Intent(this.getApplicationContext(), SubActivity.class);
newIntent.putExtras(bundle);
newIntent.putExtra("Manifest", manifest);
this.startActivity(newIntent);
}
}
package com.podcheck;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class SubActivity extends Activity implements OnClickListener {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sub);
ManifestObj mObj = (ManifestObj)this.getIntent().getSerializableExtra("Manifest");
TextView tv = (TextView)this.findViewById(R.id.tvContent);
StringBuffer sb = new StringBuffer();
sb.append("You have selected the following Category:");
sb.append("\nManifest: " + mObj.getManifestCode());
sb.append("\nManifest Raised On: " + mObj.getManifestDate());
sb.append("\nItems under this Manifest(" + mObj.ManifestItems.size() + "):");
sb.append("\n----------------------------------------------------------");
for(ManifestItemObj miObj: mObj.ManifestItems){
sb.append("\nJob:" + miObj.getJobType() + Integer.toString(miObj.getFKID()));
sb.append("\n\t");
}
tv.setText(sb.toString());
Button btn = (Button)this.findViewById(R.id.btnReturn);
btn.setOnClickListener(
this
);
}
public void onClick(View v) {
//this.finishActivity(0);
System.out.println("finish activity");
this.finish();
}
package com.podcheck;
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;
public class ManifestsAdapter extends ArrayAdapter<ManifestObj> {
int resourceId = 0;
public ManifestsAdapter(Context context, int resource, ArrayList<ManifestObj> items) {
super(context, resource, items);
this.resourceId = resource;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
LinearLayout itemRoot;
ManifestObj manifest;
manifest = this.getItem(position);
//Inflate the view
if(convertView==null)
{
itemRoot = new LinearLayout(getContext());
String inflater = Context.LAYOUT_INFLATER_SERVICE;
LayoutInflater vi;
vi = (LayoutInflater)getContext().getSystemService(inflater);
vi.inflate(this.resourceId, itemRoot, true);
}
else
{
itemRoot = (LinearLayout) convertView;
}
TextView tvName =(TextView)itemRoot.findViewById(R.id.tvCategoryName);
tvName.setText(manifest.getManifestCode());
itemRoot.setTag(manifest);
return itemRoot;
}
}
package com.podcheck;
//import android.content.Intent;
//import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.LinearLayout;
public class ManifestListItemClickListener implements OnItemClickListener {
MainActivity _mainActivity;
public ManifestListItemClickListener(MainActivity ma){
_mainActivity = ma;
}
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
LinearLayout itemRoot = (LinearLayout)view;
ManifestObj mObj = (ManifestObj)itemRoot.getTag();
StringBuffer sb = new StringBuffer();
sb.append("You have selected the following Manifest:");
sb.append("\nID: " + mObj.getManifestID());
sb.append("\nName: " + mObj.getManifestCode());
sb.append("\nManifestDate: " + mObj.getManifestDate());
// new AlertDialog.Builder(parent.getContext())
// .setTitle("Manifest Selected")
// .setMessage(sb.toString())
// .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
// public void onClick(DialogInterface dialog, int which) {
// // do something else
//
// }
// })
// .show();
_mainActivity.ShowItemsOfManifest(mObj);
}
}
package com.podcheck;
import java.io.Serializable;
public class ManifestItemObj implements Serializable
{
int ManifestItemID;
int FKID;
String JobType;
public int getManifestItemsID()
{
return ManifestItemID;
}
public void setManifestItemID(int manifestItemID)
{
ManifestItemID = manifestItemID;
}
public int getFKID()
{
return FKID;
}
public void setFKID(int fkid)
{
FKID = fkid;
}
public String getJobType()
{
return JobType;
}
public void setJobType(String jobType)
{
JobType = jobType;
}
}
package com.podcheck;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Date;
import org.joda.time.DateTime;
public class ManifestObj implements Serializable{
int ManifestID;
String ManifestCode;
Date ManifestDate;
boolean Consolidated;
ArrayList<ManifestItemObj> ManifestItems;
public int getManifestID() {
return ManifestID;
}
public void setManifestID(int manifestID) {
ManifestID = manifestID;
}
public String getManifestCode() {
return ManifestCode;
}
public void setManifestCode(String manifestCode) {
ManifestCode = manifestCode;
}
public Date getManifestDate() {
return ManifestDate;
}
public void setManifestDate(Date manifestDate) {
ManifestDate = manifestDate;
}
public boolean getConsolidated() {
return Consolidated;
}
public void setConsolidated(boolean consolidated) {
Consolidated = consolidated;
}
public ArrayList<ManifestItemObj> ManifestItems()
{
return ManifestItems;
}
public void setManifestItems(ArrayList<ManifestItemObj> manifestItems)
{
ManifestItems = manifestItems;
}
}
目前我认为这与我的 Manifest 或我的 XML 文件没有任何关系。
我有点迷茫，因为几乎没有什么不同。我已经无数次测试了我的 WCF 数据服务。
它也可能是数据集的大小吗？SQL Server 数据库中的我的清单表确实有接近 31000 条记录。
编辑：这是日志：-
'02-03 23:11:20.609: D/dalvikvm(617): GC_CONCURRENT freed 272K, 4% free 8197K/8519K, paused 33ms+5ms, total 79ms
02-03 23:11:20.609: D/dalvikvm(617): WAIT_FOR_CONCURRENT_GC blocked 32ms
02-03 23:11:20.769: D/AndroidRuntime(617): Shutting down VM
02-03 23:11:20.780: W/dalvikvm(617): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
02-03 23:11:20.809: E/AndroidRuntime(617): FATAL EXCEPTION: main
02-03 23:11:20.809: E/AndroidRuntime(617): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.podcheck/com.podcheck.MainActivity}: com.sun.jersey.api.client.ClientHandlerException: android.os.NetworkOnMainThreadException
02-03 23:11:20.809: E/AndroidRuntime(617): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
02-03 23:11:20.809: E/AndroidRuntime(617): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
02-03 23:11:20.809: E/AndroidRuntime(617): at android.app.ActivityThread.access$600(ActivityThread.java:130)
02-03 23:11:20.809: E/AndroidRuntime(617): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
02-03 23:11:20.809: E/AndroidRuntime(617): at android.os.Handler.dispatchMessage(Handler.java:99)
02-03 23:11:20.809: E/AndroidRuntime(617): at android.os.Looper.loop(Looper.java:137)
02-03 23:11:20.809: E/AndroidRuntime(617): at android.app.ActivityThread.main(ActivityThread.java:4745)
02-03 23:11:20.809: E/AndroidRuntime(617): at java.lang.reflect.Method.invokeNative(Native Method)
02-03 23:11:20.809: E/AndroidRuntime(617): at java.lang.reflect.Method.invoke(Method.java:511)
02-03 23:11:20.809: E/AndroidRuntime(617): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
02-03 23:11:20.809: E/AndroidRuntime(617): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
02-03 23:11:20.809: E/AndroidRuntime(617): at dalvik.system.NativeStart.main(Native Method)
02-03 23:11:20.809: E/AndroidRuntime(617): Caused by: com.sun.jersey.api.client.ClientHandlerException: android.os.NetworkOnMainThreadException
02-03 23:11:20.809: E/AndroidRuntime(617): at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:128)
02-03 23:11:20.809: E/AndroidRuntime(617): at com.sun.jersey.api.client.Client.handle(Client.java:457)
02-03 23:11:20.809: E/AndroidRuntime(617): at com.sun.jersey.api.client.WebResource.handle(WebResource.java:557)
02-03 23:11:20.809: E/AndroidRuntime(617): at com.sun.jersey.api.client.WebResource.access$300(WebResource.java:69)
02-03 23:11:20.809: E/AndroidRuntime(617): at com.sun.jersey.api.client.WebResource$Builder.method(WebResource.java:539)
02-03 23:11:20.809: E/AndroidRuntime(617): at org.odata4j.consumer.ODataClient.doRequest(ODataClient.java:214)
02-03 23:11:20.809: E/AndroidRuntime(617): at org.odata4j.consumer.ODataClient.getMetadata(ODataClient.java:66)
02-03 23:11:20.809: E/AndroidRuntime(617): at org.odata4j.consumer.ODataConsumer$CachedEdmDataServices.refreshDelegate(ODataConsumer.java:592)
02-03 23:11:20.809: E/AndroidRuntime(617): at org.odata4j.consumer.ODataConsumer$CachedEdmDataServices.getDelegate(ODataConsumer.java:586)
02-03 23:11:20.809: E/AndroidRuntime(617): at org.odata4j.internal.EdmDataServicesDecorator.findEdmEntitySet(EdmDataServicesDecorator.java:46)
02-03 23:11:20.809: E/AndroidRuntime(617): at org.odata4j.consumer.ODataConsumer$CachedEdmDataServices.findEdmEntitySet(ODataConsumer.java:598)
02-03 23:11:20.809: E/AndroidRuntime(617): at org.odata4j.consumer.ODataConsumer.getFeedCustomizationMapping(ODataConsumer.java:559)
02-03 23:11:20.809: E/AndroidRuntime(617): at org.odata4j.consumer.ODataConsumer.getEntities(ODataConsumer.java:313)
02-03 23:11:20.809: E/AndroidRuntime(617): at org.odata4j.consumer.ODataConsumer.getEntities(ODataConsumer.java:300)
02-03 23:11:20.809: E/AndroidRuntime(617): at com.podcheck.MainActivity.GetManifestItems(MainActivity.java:46)
02-03 23:11:20.809: E/AndroidRuntime(617): at com.podcheck.MainActivity.onCreate(MainActivity.java:33)
02-03 23:11:20.809: E/AndroidRuntime(617): at android.app.Activity.performCreate(Activity.java:5008)
02-03 23:11:20.809: E/AndroidRuntime(617): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
02-03 23:11:20.809: E/AndroidRuntime(617): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
02-03 23:11:20.809: E/AndroidRuntime(617): ... 11 more
02-03 23:11:20.809: E/AndroidRuntime(617): Caused by: android.os.NetworkOnMainThreadException
02-03 23:11:20.809: E/AndroidRuntime(617): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
02-03 23:11:20.809: E/AndroidRuntime(617): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
02-03 23:11:20.809: E/AndroidRuntime(617): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
02-03 23:11:20.809: E/AndroidRuntime(617): at libcore.io.IoBridge.connect(IoBridge.java:112)
02-03 23:11:20.809: E/AndroidRuntime(617): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
02-03 23:11:20.809: E/AndroidRuntime(617): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
02-03 23:11:20.809: E/AndroidRuntime(617): at java.net.Socket.connect(Socket.java:842)
02-03 23:11:20.809: E/AndroidRuntime(617): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:76)
02-03 23:11:20.809: E/AndroidRuntime(617): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
02-03 23:11:20.809: E/AndroidRuntime(617): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:341)
02-03 23:11:20.809: E/AndroidRuntime(617): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
02-03 23:11:20.809: E/AndroidRuntime(617): at libcore.net.http.HttpConnection.connect(HttpConnection.java:117)
02-03 23:11:20.809: E/AndroidRuntime(617): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:315)
02-03 23:11:20.809: E/AndroidRuntime(617): at libcore.net.http.HttpEngine.connect(HttpEngine.java:310)
02-03 23:11:20.809: E/AndroidRuntime(617): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:289)
02-03 23:11:20.809: E/AndroidRuntime(617): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:239)
02-03 23:11:20.809: E/AndroidRuntime(617): at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:273)
02-03 23:11:20.809: E/AndroidRuntime(617): at libcore.net.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:486)
02-03 23:11:20.809: E/AndroidRuntime(617): at com.sun.jersey.client.urlconnection.URLConnectionClientHandler._invoke(URLConnectionClientHandler.java:215)
02-03 23:11:20.809: E/AndroidRuntime(617): at com.sun.jersey.client.urlconnection.URLConnect
02-03 23:11:20.839: D/dalvikvm(617): GC_CONCURRENT freed 463K, 6% free 8261K/8775K, paused 25ms+6ms, total 91ms
02-03 23:11:20.839: D/dalvikvm(617): WAIT_FOR_CONCURRENT_GC blocked 14ms'
编辑：
我怀疑这是现在的问题：-
ODataConsumer c = ODataJerseyConsumer.create("http://192.168.0.105:8090/PODDataService.svc");
for (OEntity entityObj : c.getEntities("Manifests").expand("ManifestItems").execute())
{
//opcode
}
这意味着它没有读取 WCF 服务。对？
另一个编辑： 同一个应用程序现在可以在 Android 2.3 中运行。Android 4 与 2.3 有何不同？另一个有待揭开的谜团。