Question

所以我正在研究一个从URL读取XML文件的应用程序。我发现没有找到任何来源的问题。不断弹出的文件是

activitythread.performlaunchactivity（activitythread $ activityclientrecord intent）行：2305

这是我的代码：

package com.lnrpuc.lnrpucseniordesign;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Iterator;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ToggleButton;

public class LightsMainScreen extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.lights_main);

        XmlPullParserFactory pullParserFactory;
        try {
            pullParserFactory = XmlPullParserFactory.newInstance();
            XmlPullParser xpp = pullParserFactory.newPullParser();

            URL url = new URL("http://lnrpuc.com/List.xml");
            URLConnection urlc = url.openConnection();
            InputStream is = new BufferedInputStream(urlc.getInputStream());

            xpp.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES,false);
            xpp.setInput(is,null);

            parseXML(xpp);

        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (XmlPullParserException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        Button returnBtn = (Button)findViewById(R.id.returnBtn);

        returnBtn.setOnClickListener( new View.OnClickListener() {
            public void onClick(View v) {
                finish();
            }
        });
    }  

    private void parseXML(XmlPullParser xpp) throws XmlPullParserException,IOException
    {
        ArrayList<Lights> lights = null;
            int eventType = xpp.getEventType();
            Lights lightStatus = null;
            boolean lightsTag = false;
            boolean lightsStatusTag = false;

            while(eventType != XmlPullParser.END_DOCUMENT) {
                String currentTag = null;
                switch(eventType){
                case XmlPullParser.START_DOCUMENT:
                    lights = new ArrayList<Lights>();
                    break;
                case XmlPullParser.START_TAG:
                    currentTag = xpp.getName();
                    if(currentTag == "Lights"){
                        lightStatus = new Lights();
                        lightsTag = true;   }
                    else if(currentTag == "Status"){
                        lightsStatusTag = true; }
                    else if(currentTag == "a" && lightsTag && lightsStatusTag)  {
                        lightStatus.light1 = xpp.nextText();    }
                    else if(currentTag == "b" && lightsTag && lightsStatusTag)  {
                        lightStatus.light2 = xpp.nextText();    }
                    else if(currentTag == "c" && lightsTag && lightsStatusTag)  {
                        lightStatus.light3 = xpp.nextText();    }
                    else if(currentTag == "d" && lightsTag && lightsStatusTag)  {
                        lightStatus.light4 = xpp.nextText();    }
                    else if(currentTag == "e" && lightsTag && lightsStatusTag)  {
                        lightStatus.light5 = xpp.nextText();    }
                    else if(currentTag == "f" && lightsTag && lightsStatusTag)  {
                        lightStatus.light6 = xpp.nextText();    }
                    else if(currentTag == "g" && lightsTag && lightsStatusTag)  {
                        lightStatus.light7 = xpp.nextText();    }
                    else if(currentTag == "h" && lightsTag && lightsStatusTag)  {
                        lightStatus.light8 = xpp.nextText();    }
                    break;
                case XmlPullParser.END_TAG:
                    currentTag = xpp.getName();
                    if(currentTag.equalsIgnoreCase("status") && lightStatus != null){
                        lights.add(lightStatus);
                        lightsStatusTag = false;    }
                    else if(currentTag.equalsIgnoreCase("lights")){
                        lightsTag = false;  }                       
                    }
                eventType = xpp.next();
                }
            setLights(lights);
        }

    private void setLights(ArrayList<Lights> lights)
    {
        int light_1 = 0, light_2 = 0, light_3 = 0, light_4 = 0,
                light_5 = 0, light_6 = 0, light_7 = 0, light_8 = 0;

        ToggleButton light1Btn = (ToggleButton)findViewById(R.id.light_1);
        ToggleButton light2Btn = (ToggleButton)findViewById(R.id.light_2);
        ToggleButton light3Btn = (ToggleButton)findViewById(R.id.light_3);
        ToggleButton light4Btn = (ToggleButton)findViewById(R.id.light_4);
        ToggleButton light5Btn = (ToggleButton)findViewById(R.id.light_5);
        ToggleButton light6Btn = (ToggleButton)findViewById(R.id.light_6);
        ToggleButton light7Btn = (ToggleButton)findViewById(R.id.light_7);
        ToggleButton light8Btn = (ToggleButton)findViewById(R.id.light_8);

        Iterator<Lights> it = lights.iterator();
        while(it.hasNext())
        {
            Lights lightStatus = (Lights) it.next();
            light_1 = Integer.parseInt(lightStatus.light1);
            light_2 = Integer.parseInt(lightStatus.light2);
            light_3 = Integer.parseInt(lightStatus.light3);
            light_4 = Integer.parseInt(lightStatus.light4);
            light_5 = Integer.parseInt(lightStatus.light5);
            light_6 = Integer.parseInt(lightStatus.light6);
            light_7 = Integer.parseInt(lightStatus.light7);
            light_8 = Integer.parseInt(lightStatus.light8);
        }

        if(light_1 == 1)    {
            light1Btn.setChecked(true);
        } else light1Btn.setChecked(false);
        if(light_2 == 1)    {
            light2Btn.setChecked(true);
        } else light2Btn.setChecked(false);
        if(light_3 == 1)    {
            light3Btn.setChecked(true);
        } else light3Btn.setChecked(false);
        if(light_4 == 1)    {
            light4Btn.setChecked(true);
        } else light4Btn.setChecked(false);
        if(light_5 == 1)    {
            light5Btn.setChecked(true);
        } else light5Btn.setChecked(false);
        if(light_6 == 1)    {
            light6Btn.setChecked(true);
        } else light6Btn.setChecked(false);
        if(light_7 == 1)    {
            light7Btn.setChecked(true);
        } else light7Btn.setChecked(false);
        if(light_8 == 1)    {
            light8Btn.setChecked(true);
        } else light8Btn.setChecked(false);
    }
}

class Lights
{
    public String light1;
    public String light2;
    public String light3;
    public String light4;
    public String light5;
    public String light6;
    public String light7;
    public String light8;
}

我是Android编程新手，不知道问题出在哪里。

    02-01 22:48:10.628: W/ActivityThread(14211): Application com.lnrpuc.lnrpucseniordesign is waiting for the debugger on port 8100...
02-01 22:48:10.628: I/System.out(14211): Sending WAIT chunk
02-01 22:48:10.768: I/dalvikvm(14211): Debugger is active
02-01 22:48:10.828: I/System.out(14211): Debugger has connected
02-01 22:48:10.828: I/System.out(14211): waiting for debugger to settle...
02-01 22:48:11.028: I/System.out(14211): waiting for debugger to settle...
02-01 22:48:11.239: I/System.out(14211): waiting for debugger to settle...
02-01 22:48:11.439: I/System.out(14211): waiting for debugger to settle...
02-01 22:48:11.639: I/System.out(14211): waiting for debugger to settle...
02-01 22:48:11.839: I/System.out(14211): waiting for debugger to settle...
02-01 22:48:12.039: I/System.out(14211): waiting for debugger to settle...
02-01 22:48:12.230: I/System.out(14211): debugger has settled (1310)
02-01 22:48:19.597: D/AndroidRuntime(14211): Shutting down VM
02-01 22:48:19.597: W/dalvikvm(14211): threadid=1: thread exiting with uncaught exception (group=0x417c0898)
02-01 22:48:19.658: E/AndroidRuntime(14211): FATAL EXCEPTION: main
02-01 22:48:19.658: E/AndroidRuntime(14211): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.lnrpuc.lnrpucseniordesign/com.lnrpuc.lnrpucseniordesign.LightsMainScreen}: android.os.NetworkOnMainThreadException
02-01 22:48:19.658: E/AndroidRuntime(14211):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2305)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2359)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at android.app.ActivityThread.access$700(ActivityThread.java:165)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1326)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at android.os.Handler.dispatchMessage(Handler.java:99)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at android.os.Looper.loop(Looper.java:137)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at android.app.ActivityThread.main(ActivityThread.java:5455)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at java.lang.reflect.Method.invokeNative(Native Method)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at java.lang.reflect.Method.invoke(Method.java:525)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at dalvik.system.NativeStart.main(Native Method)
02-01 22:48:19.658: E/AndroidRuntime(14211): Caused by: android.os.NetworkOnMainThreadException
02-01 22:48:19.658: E/AndroidRuntime(14211):    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1144)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at java.net.InetAddress.getAllByName(InetAddress.java:214)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:282)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:177)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at com.lnrpuc.lnrpucseniordesign.LightsMainScreen.onCreate(LightsMainScreen.java:38)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at android.app.Activity.performCreate(Activity.java:5372)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
02-01 22:48:19.658: E/AndroidRuntime(14211):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2267)
02-01 22:48:19.658: E/AndroidRuntime(14211):    ... 11 more

更新：我改为使用AsyncTask而不是之前的配置，我现在收到线程错误。我不确定为什么会抛出这些错误。

LightsMainScreen.java

package com.lnrpuc.lnrpucseniordesign;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ToggleButton;

import com.lnrpuc.lnrpucseniordesign.LightTest1;

public class LightsMainScreen extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.lights_main);

        Button returnBtn = (Button)findViewById(R.id.returnBtn);
        ToggleButton light3Btn = (ToggleButton)findViewById(R.id.light_3);

        light3Btn.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView,
                    boolean isChecked) {
                new UpdateXML().execute();  }   }   )   ;

        returnBtn.setOnClickListener( new View.OnClickListener() {
            public void onClick(View v) {
                finish();   }   }   )   ;
    }

    private class UpdateXML extends AsyncTask<String, Void, Void>
    {
        ToggleButton light3Btn = (ToggleButton)findViewById(R.id.light_3);

        protected Void doInBackground(String... params) {
            if(light3Btn.isChecked()) LightTest1.XMLUpdate("1", "3", "1");
            else LightTest1.XMLUpdate("1", "3", "0");
            return null;
        }

        protected void onPostExecute()  {}

        @Override
        protected void onPreExecute() {}

        protected void onProgressUpdate()   {}
    }
}

LightTest1.java

package com.lnrpuc.lnrpucseniordesign;

import java.rmi.RemoteException;

import com.lnrpuc.Services.GetNamesRequestType;
import com.lnrpuc.Services.GetNamesResponseType;
import com.lnrpuc.Services.GetStatusRequestType;
import com.lnrpuc.Services.GetStatusResponseType;
import com.lnrpuc.Services.HomeAutomationServicePortTypeProxy;
import com.lnrpuc.Services.SetStatusRequestType;
import com.lnrpuc.Services.SetStatusResponseType;


public class LightTest1 {

    public static void XMLUpdate(String object, String number, String status){
        try {
            HomeAutomationServicePortTypeProxy proxy = new HomeAutomationServicePortTypeProxy();

            //names request
            //GetNamesRequestType inGNRT = new GetNamesRequestType();
            //inGNRT.setPass("12345");

            //GetNamesResponseType outGNRT = proxy.getNames(inGNRT);
            //System.out.println(outGNRT.get_return());

            //status request
            //GetStatusRequestType inGSRT = new GetStatusRequestType();
            //inGSRT.setPass("12345");

            //GetStatusResponseType outGSRT = proxy.getStatus(inGSRT);
            //System.out.println(outGSRT.get_return());

            //set status
            SetStatusRequestType inSSRT = new SetStatusRequestType();
            inSSRT.setPass("12345");
            inSSRT.setObject(object);
            inSSRT.setNumber(number);
            inSSRT.setStatus(status);

            SetStatusResponseType outSSRT = proxy.setStatus(inSSRT);
            System.out.println(outSSRT.get_return());


        } catch (RemoteException e) {
            // TODO Auto-generated catch block
            System.out.println("failed");
        }


    }
}

LogCat输出

02-06 13:53:38.759: I/dalvikvm(16012): Failed resolving Lcom/lnrpuc/Services/HomeAutomationServicePortType; interface 93 'Ljava/rmi/Remote;'
02-06 13:53:38.759: W/dalvikvm(16012): Link of class 'Lcom/lnrpuc/Services/HomeAutomationServicePortType;' failed
02-06 13:53:38.759: I/dalvikvm(16012): Failed resolving Lcom/lnrpuc/Services/HomeAutomationServicePortTypeProxy; interface 30 'Lcom/lnrpuc/Services/HomeAutomationServicePortType;'
02-06 13:53:38.759: W/dalvikvm(16012): Link of class 'Lcom/lnrpuc/Services/HomeAutomationServicePortTypeProxy;' failed
02-06 13:53:38.759: E/dalvikvm(16012): Could not find class 'com.lnrpuc.Services.HomeAutomationServicePortTypeProxy', referenced from method com.lnrpuc.lnrpucseniordesign.LightTest1.XMLUpdate
02-06 13:53:38.759: W/dalvikvm(16012): VFY: unable to resolve new-instance 31 (Lcom/lnrpuc/Services/HomeAutomationServicePortTypeProxy;) in Lcom/lnrpuc/lnrpucseniordesign/LightTest1;
02-06 13:53:38.759: D/dalvikvm(16012): VFY: replacing opcode 0x22 at 0x0000
02-06 13:53:38.759: W/dalvikvm(16012): VFY: unable to resolve exception class 94 (Ljava/rmi/RemoteException;)
02-06 13:53:38.759: W/dalvikvm(16012): VFY: unable to find exception handler at addr 0x26
02-06 13:53:38.759: W/dalvikvm(16012): VFY:  rejected Lcom/lnrpuc/lnrpucseniordesign/LightTest1;.XMLUpdate (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
02-06 13:53:38.759: W/dalvikvm(16012): VFY:  rejecting opcode 0x0d at 0x0026
02-06 13:53:38.769: W/dalvikvm(16012): VFY:  rejected Lcom/lnrpuc/lnrpucseniordesign/LightTest1;.XMLUpdate (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
02-06 13:53:38.769: W/dalvikvm(16012): Verifier rejected class Lcom/lnrpuc/lnrpucseniordesign/LightTest1;
02-06 13:53:38.769: W/dalvikvm(16012): threadid=11: thread exiting with uncaught exception (group=0x417c0898)
02-06 13:53:38.769: E/AndroidRuntime(16012): FATAL EXCEPTION: AsyncTask #1
02-06 13:53:38.769: E/AndroidRuntime(16012): java.lang.RuntimeException: An error occured while executing doInBackground()
02-06 13:53:38.769: E/AndroidRuntime(16012):    at android.os.AsyncTask$3.done(AsyncTask.java:299)
02-06 13:53:38.769: E/AndroidRuntime(16012):    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
02-06 13:53:38.769: E/AndroidRuntime(16012):    at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
02-06 13:53:38.769: E/AndroidRuntime(16012):    at java.util.concurrent.FutureTask.run(FutureTask.java:239)
02-06 13:53:38.769: E/AndroidRuntime(16012):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
02-06 13:53:38.769: E/AndroidRuntime(16012):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
02-06 13:53:38.769: E/AndroidRuntime(16012):    at java.lang.Thread.run(Thread.java:841)
02-06 13:53:38.769: E/AndroidRuntime(16012): Caused by: java.lang.VerifyError: com/lnrpuc/lnrpucseniordesign/LightTest1
02-06 13:53:38.769: E/AndroidRuntime(16012):    at com.lnrpuc.lnrpucseniordesign.LightsMainScreen$UpdateXML.doInBackground(LightsMainScreen.java:41)
02-06 13:53:38.769: E/AndroidRuntime(16012):    at com.lnrpuc.lnrpucseniordesign.LightsMainScreen$UpdateXML.doInBackground(LightsMainScreen.java:1)
02-06 13:53:38.769: E/AndroidRuntime(16012):    at android.os.AsyncTask$2.call(AsyncTask.java:287)
02-06 13:53:38.769: E/AndroidRuntime(16012):    at java.util.concurrent.FutureTask.run(FutureTask.java:234)
02-06 13:53:38.769: E/AndroidRuntime(16012):    ... 3 more

Answer 1

您正在主UI线程上进行网络操作，这就是您的应用崩溃的原因。不要在onCreate方法中进行网络操作。

创建异步任务并在后台线程中执行网络操作

查看这些链接以获取更多信息

How to use AsyncTask correctly in Android

http://developer.android.com/reference/android/os/AsyncTask.html

activitythread.performlaunchactivity（activitythread $ activityclientrecord intent）line：2305

1 个答案: