我正在尝试遵循有关发布HTTP数据的教程，但是由于IO线程上的网络活动，它强制关闭主线程，因此我尝试实现AsyncTask（正如其他一些有用的SO用户所建议的那样）我已经剔除了代码，整个enchilada力量都在我身上。）
:(
提前致谢！
NoobNinja
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)
{
}
@Override
protected void saveContactTask.execute()
{
}
;
@Override
protected Object doInBackground(Object... params)
{
return null;
}
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);
protected void saveContactTask.execute();
// 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;
?>
logcat的：
03-27 16:30:00.775: D/dalvikvm(14566): GC_FOR_ALLOC freed 88K, 3% free 7355K/7568K, paused 36ms, total 36ms
03-27 16:30:00.785: I/dalvikvm-heap(14566): Grow heap (frag case) to 10.818MB for 3686416-byte allocation
03-27 16:30:00.825: D/dalvikvm(14566): GC_FOR_ALLOC freed 1K, 2% free 10953K/11172K, paused 35ms, total 35ms
03-27 16:30:00.845: D/dalvikvm(14566): GC_CONCURRENT freed <1K, 2% free 10953K/11172K, paused 3ms+3ms, total 29ms
03-27 16:30:01.095: D/dalvikvm(14566): GC_FOR_ALLOC freed <1K, 2% free 10953K/11172K, paused 16ms, total 16ms
03-27 16:30:01.105: I/dalvikvm-heap(14566): Grow heap (frag case) to 17.043MB for 6529744-byte allocation
03-27 16:30:01.125: D/dalvikvm(14566): GC_FOR_ALLOC freed 0K, 2% free 17330K/17552K, paused 16ms, total 16ms
03-27 16:30:01.145: D/dalvikvm(14566): GC_CONCURRENT freed 0K, 2% free 17330K/17552K, paused 3ms+3ms, total 23ms
03-27 16:30:01.275: D/libEGL(14566): loaded /system/lib/egl/libEGL_tegra.so
03-27 16:30:01.285: D/libEGL(14566): loaded /system/lib/egl/libGLESv1_CM_tegra.so
03-27 16:30:01.295: D/libEGL(14566): loaded /system/lib/egl/libGLESv2_tegra.so
03-27 16:30:01.325: D/OpenGLRenderer(14566): Enabling debug mode 0
03-27 16:30:03.325: D/AndroidRuntime(14566): Shutting down VM
03-27 16:30:03.325: W/dalvikvm(14566): threadid=1: thread exiting with uncaught exception (group=0x41cd2930)
03-27 16:30:03.325: E/AndroidRuntime(14566): FATAL EXCEPTION: main
03-27 16:30:03.325: E/AndroidRuntime(14566): java.lang.Error: Unresolved compilation problems:
03-27 16:30:03.325: E/AndroidRuntime(14566): Syntax error on token ".", ; expected
03-27 16:30:03.325: E/AndroidRuntime(14566): Syntax error, insert ";" to complete FieldDeclaration
03-27 16:30:03.325: E/AndroidRuntime(14566): Syntax error, insert "}" to complete ClassBody
03-27 16:30:03.325: E/AndroidRuntime(14566): at com.nfc.linkingmanager.DeviceConfig.<init>(DeviceConfig.java:48)
03-27 16:30:03.325: E/AndroidRuntime(14566): at java.lang.Class.newInstanceImpl(Native Method)
03-27 16:30:03.325: E/AndroidRuntime(14566): at java.lang.Class.newInstance(Class.java:1319)
03-27 16:30:03.325: E/AndroidRuntime(14566): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
03-27 16:30:03.325: E/AndroidRuntime(14566): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
03-27 16:30:03.325: E/AndroidRuntime(14566): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
03-27 16:30:03.325: E/AndroidRuntime(14566): at android.app.ActivityThread.access$600(ActivityThread.java:141)
03-27 16:30:03.325: E/AndroidRuntime(14566): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
03-27 16:30:03.325: E/AndroidRuntime(14566): at android.os.Handler.dispatchMessage(Handler.java:99)
03-27 16:30:03.325: E/AndroidRuntime(14566): at android.os.Looper.loop(Looper.java:137)
03-27 16:30:03.325: E/AndroidRuntime(14566): at android.app.ActivityThread.main(ActivityThread.java:5041)
03-27 16:30:03.325: E/AndroidRuntime(14566): at java.lang.reflect.Method.invokeNative(Native Method)
03-27 16:30:03.325: E/AndroidRuntime(14566): at java.lang.reflect.Method.invoke(Method.java:511)
03-27 16:30:03.325: E/AndroidRuntime(14566): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-27 16:30:03.325: E/AndroidRuntime(14566): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-27 16:30:03.325: E/AndroidRuntime(14566): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
NetworkOnMainThreadException
您正在获取异常，因为您正在主线程上进行网络操作，这不允许Android版＆gt; = 3.0。
使用AsyncTask进行网络操作。
使用doInBackground()方法进行网络操作。
阅读AsyncTask的Android文档。