Android 异步任务错误

我最初直接在UI中进行接口，但收到错误。我改为使用AsyncTask而不是以前的配置，现在收到了不同的错误。我不确定它为什么会抛出错误

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()   {}
    }
}

对数输出

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

---

我很确定不能在主线程之外使用UI元素（例如，在异步任务中）。我建议你放弃AsyncTask，试着解决最初的错误。@BarryFruitman当然可以！这就是为什么这个类有4个方法

doInBackground（）

无法更新

UI线程

，但其他3个线程中的任何一个都可以更新，这就是它们存在的原因。原始布局的问题是试图在UI中进行联网。如果我在主线程中执行UI工作，然后将值发送到AsyncTask，该怎么办？@JustinLasecki就

UI

和

AsyncTask

而言，我看不到您有任何做错的地方。如果您正在更新

UI

，则会出现不同的异常。类似于

的东西只有创建视图的原始线程才能更新它。您正在使用的库似乎存在问题。
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