继Android的HTTP示例/教程 - 颁布实施异步任务的网络活动(Following Andro

2019-08-18 01:28发布

我试图遵循关于发布HTTP数据的教程但其强制关闭主线程上由于IO线程,所以我已经尝试实现的AsyncTask(网络活动由几个其他有用的,这样用户的建议 - 但我已经屠杀的代码和事情的方方面面力关闭在我身上。)

:(

http://webtutsdepot.com/2011/11/15/android-tutorial-how-to-post-data-from-an-android-app-to-a-website/

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)

Answer 1:

NetworkOnMainThreadException

因为你在主线程这是不允许的Android版本> = 3.0做网络操作你正在例外。

使用的AsyncTask做网络操作。

不要在你的网络操作doInBackground()方法。

请参阅Android版文档的AsyncTask 。



文章来源: Following Android HTTP Example / Tutorial - Issue Implementing Async Task for Network Activity