实现异步任务 - 我加了一些源代码来实现的AsyncTask，但它仍然是强制关闭，由于IO线程上运行 - 应用程序组尝试分析数据（？异步任务未执行）

Question

我很新的这个时候关闭而不是实现AsyncTask。我知道我在做一些不正确的事，但我不确定它会是什么。

JAVA：

import java.io.IOException; 
import org.apache.http.client.ClientProtocolException; 


import java.util.ArrayList; 
import android.os.AsyncTask; 
import java.util.List; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.DefaultHttpClient; 


import org.apache.http.NameValuePair; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.message.BasicNameValuePair; 

// import everything you need 
import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 


public class DeviceConfig extends Activity { 

    AsyncTask<Object, Object, Object> saveContactTask = 
      new AsyncTask<Object, Object, Object>() 
      { 
       @Override 
       protected Object doInBackground(Object... params) 
       { 

        return null; 
       } 

       @Override 
       protected void onPostExecute(Object result) 
       { 
        finish(); 
       } 
      }; 



    Button sendButton; 

    EditText msgTextField; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     // load the layout 
     setContentView(R.layout.deviceconfig);   

     // make message text field object 
     msgTextField = (EditText) findViewById(R.id.msgTextField); 
     // make send button object 
     sendButton = (Button) findViewById(R.id.sendButton); 

    } 

    // this is the function that gets called when you click the button 
    public void send(View v) 
    { 
     // get the message from the message text box 
     String msg = msgTextField.getText().toString(); 

     // make sure the fields are not empty 
     if (msg.length()>0) 
     { 
      HttpClient httpclient = new DefaultHttpClient(); 
      HttpPost httppost = new HttpPost("http://gamedemo.hostzi.com/test.php"); 
     try { 
      List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2); 
      nameValuePairs.add(new BasicNameValuePair("id", "12345")); 
      nameValuePairs.add(new BasicNameValuePair("message", msg)); 
      httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 
      httpclient.execute(httppost); 
      msgTextField.setText(""); // clear text box 
     } catch (ClientProtocolException e) { 
      // TODO Auto-generated catch block 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
     } 

     } 
     else 
     { 
      // display message if text fields are empty 
      Toast.makeText(getBaseContext(),"All field are required",Toast.LENGTH_SHORT).show(); 
     } 

    } 

} 

XML：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 
    <TextView 
     android:text="Message" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     /> 

    <EditText 
     android:id="@+id/msgTextField" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     /> 
    <Button 
     android:text="Send" 
     android:id="@+id/sendButton" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:onClick="send" 
     /> 

</LinearLayout> 

PHP：

<?php 
// get the "message" variable from the post request 
// this is the data coming from the Android app 
$message=$_POST["message"]; 
// specify the file where we will save the contents of the variable message 
$filename="androidmessages.html"; 
// write (append) the data to the file 
file_put_contents($filename,$message."<br />",FILE_APPEND); 
// load the contents of the file to a variable 
$androidmessages=file_get_contents($filename); 
// display the contents of the variable (which has the contents of the file) 
echo $androidmessages; 
?> 

的logcat：

03-27 16:07:05.795: D/dalvikvm(11620): Late-enabling CheckJNI 
03-27 16:07:05.935: D/dalvikvm(11620): GC_FOR_ALLOC freed 88K, 3% free 7355K/7568K, paused 18ms, total 19ms 
03-27 16:07:05.945: I/dalvikvm-heap(11620): Grow heap (frag case) to 10.818MB for 3686416-byte allocation 
03-27 16:07:05.975: D/dalvikvm(11620): GC_FOR_ALLOC freed 1K, 2% free 10953K/11172K, paused 25ms, total 25ms 
03-27 16:07:05.995: D/dalvikvm(11620): GC_CONCURRENT freed <1K, 2% free 10953K/11172K, paused 3ms+2ms, total 18ms 
03-27 16:07:06.285: D/dalvikvm(11620): GC_FOR_ALLOC freed <1K, 2% free 10953K/11172K, paused 15ms, total 16ms 
03-27 16:07:06.305: I/dalvikvm-heap(11620): Grow heap (frag case) to 17.043MB for 6529744-byte allocation 
03-27 16:07:06.315: D/dalvikvm(11620): GC_FOR_ALLOC freed 0K, 2% free 17330K/17552K, paused 16ms, total 16ms 
03-27 16:07:06.335: D/dalvikvm(11620): GC_CONCURRENT freed <1K, 2% free 17330K/17552K, paused 3ms+2ms, total 21ms 
03-27 16:07:06.435: D/libEGL(11620): loaded /system/lib/egl/libEGL_tegra.so 
03-27 16:07:06.455: D/libEGL(11620): loaded /system/lib/egl/libGLESv1_CM_tegra.so 
03-27 16:07:06.465: D/libEGL(11620): loaded /system/lib/egl/libGLESv2_tegra.so 
03-27 16:07:06.485: D/OpenGLRenderer(11620): Enabling debug mode 0 
03-27 16:07:19.615: W/IInputConnectionWrapper(11620): showStatusIcon on inactive InputConnection 
03-27 16:07:45.695: D/AndroidRuntime(11620): Shutting down VM 
03-27 16:07:45.695: W/dalvikvm(11620): threadid=1: thread exiting with uncaught exception (group=0x41cd2930) 
03-27 16:07:45.695: E/AndroidRuntime(11620): FATAL EXCEPTION: main 
03-27 16:07:45.695: E/AndroidRuntime(11620): java.lang.IllegalStateException: Could not execute method of the activity 
03-27 16:07:45.695: E/AndroidRuntime(11620): at android.view.View$1.onClick(View.java:3599) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at android.view.View.performClick(View.java:4204) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at android.view.View$PerformClick.run(View.java:17355) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at android.os.Handler.handleCallback(Handler.java:725) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at android.os.Handler.dispatchMessage(Handler.java:92) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at android.os.Looper.loop(Looper.java:137) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at android.app.ActivityThread.main(ActivityThread.java:5041) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at java.lang.reflect.Method.invokeNative(Native Method) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at java.lang.reflect.Method.invoke(Method.java:511) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at dalvik.system.NativeStart.main(Native Method) 
03-27 16:07:45.695: E/AndroidRuntime(11620): Caused by: java.lang.reflect.InvocationTargetException 
03-27 16:07:45.695: E/AndroidRuntime(11620): at java.lang.reflect.Method.invokeNative(Native Method) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at java.lang.reflect.Method.invoke(Method.java:511) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at android.view.View$1.onClick(View.java:3594) 
03-27 16:07:45.695: E/AndroidRuntime(11620): ... 11 more 
03-27 16:07:45.695: E/AndroidRuntime(11620): Caused by: android.os.NetworkOnMainThreadException 
03-27 16:07:45.695: E/AndroidRuntime(11620): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at java.net.InetAddress.getAllByName(InetAddress.java:214) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 
03-27 16:07:45.695: E/AndroidRuntime(11620): at com.nfc.linkingmanager.DeviceConfig.send(DeviceConfig.java:84) 
03-27 16:07:45.695: E/AndroidRuntime(11620): ... 14 more 

Answer 1

你永远不会调用saveContactTask.execute（）。这是我确实看到的一件事。发送需要在doInBackground（）中调用。 saveContactTask.execute（）需要在点击按钮时调用。

Answer 2

您需要HttpClient的东西搬进的AsyncTask，因为你不能在主线程上做网络调用。

而且你是不是叫saveContactTask.execute（）。并在onPostExecute（）我不认为你想调用finish（），因为这会杀死你的活动。