如何使用httpPost,应用程序崩溃将数据发送到一个网站 [英] How to send data to a website using httpPost, app crashes
问题描述
目前,我工作的一个项目。我需要从我的Android应用程序发送一些数据到网络服务器。但是,当我碰到了发送按钮的应用程序崩溃。
Currently I am working on a project. I need to send some data from my android app to a webserver. But when I touched the send button the app crashes.
这是我的.java文件
package com.androidexample.httppostexample;
import java.io.IOException;
import org.apache.http.client.ClientProtocolException;
import java.util.ArrayList;
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 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 HttpPostExample extends Activity {
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.activity_http_post_example);
// 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://www.eeecoderpages.orgfree.com/post.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();
}
}
}
下面是我的XML GUI文件:
Here is my xml gui file:
<?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>
我也加入了互联网许可清单:
I also add the internet permission to the manifest :
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
而在网络服务器端,我用下面的 PHP脚本
<?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;
?>
不过,这是行不通的。 当我碰到了发送按钮,系统关机我的应用程序。我搜索了很多解决方案,但非,他们对我的作品的。从任何机构的任何帮助,我将不胜感激!
But it doesn't work. When I touched the send button the system shutdown my app. I searched a lot of solutions but non-of them works for me. Any help from any body I will be grateful!
推荐答案
在UI主线程联网操作是不允许的。
Networking operation on UI Main thread are not allowed.
试试下面的code。
public class NetRequestAsync extends AsyncTask<Void, Void, Boolean> {
String id, msg;
public NetRequestAsync(String id, String message) {
this.id = id;
this.msg = message;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Boolean doInBackground(Void... params) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(
"http://www.eeecoderpages.orgfree.com/post.php");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(
2);
nameValuePairs.add(new BasicNameValuePair("id", id));
nameValuePairs.add(new BasicNameValuePair("message", msg));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
return true;
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return false;
}
@Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
if(result){
//successful request
}else{
//error in request response
}
msgTextField.setText(""); // clear text box
}
}
要使用code,
NetRequestAsync request = new NetRequestAsync("12345","Hi");
request.execute();
注意
UI如更新的TextView,EditText上或设置图像的ImageView操作未在 doInBackground()
法允许的。你可以在 onPostExecute()
或在preExecute()
。
UI operation like updating TextView, EditText or setting image to ImageView are not allowed in doInBackground()
method. You can do that in onPostExecute()
or onPreExecute()
.
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