發送來自Android的HTTP請求到PHP

Question

我試圖從Android發送一個HTTP請求到下面這段代碼的PHP，但應用程序在啓動時不斷崩潰。

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_android_test); 

    HttpClient client = new DefaultHttpClient(); 
    HttpPost post = new HttpPost("http://192.168.1.5:80/arduino2/socket.php"); 
    List<NameValuePair> pairs = new ArrayList<NameValuePair>(); 
    pairs.add(new BasicNameValuePair("lighton", "")); 
    try { 
     post.setEntity(new UrlEncodedFormEntity(pairs)); 
    } catch (UnsupportedEncodingException e) { 
     e.printStackTrace(); 
    } 

    try { 
     HttpResponse response = client.execute(post); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
} 

這是我試圖發送請求的PHP（socket.php）文件。這個PHP文件向Arduino發送一個請求，當使用HTML按鈕並提交表單時，該請求可以正常工作。

<?php 
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); 
socket_connect($sock,"192.168.1.8", 80); 

$msg = 'a'; 
if (isset($_POST['lighton'])){ 
    $msg='lighton'; 
} 
if (isset($_POST['lightoff'])){ 
    $msg='lightoff'; 
} 
if (isset($_POST['relayoff'])){ 
    $msg='relayoff'; 
} 
if (isset($_POST['relayon'])){ 
    $msg='relayon'; 
} 
if (isset($_POST['temp'])){ 
    $msg='temp'; 
} 
echo $sock; 
socket_write($sock, $msg); 
sleep(1); 
header("Location: http://192.168.1.5/arduino2/index.php"); /* Redirect browser */ 
exit(); 
?> 

Answer 1

您應該使用asynctask進行網絡操作。下面是代碼：

的AsyncTask類爲您

import java.io.IOException; 
import java.io.UnsupportedEncodingException; 
import java.util.ArrayList; 
import java.util.List; 

import org.apache.http.HttpResponse; 
import org.apache.http.NameValuePair; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.message.BasicNameValuePair; 

import android.os.AsyncTask; 

public class MyNetworkOperation extends AsyncTask<Void, Void, Void> { 

private String url; 

// Pass your url with constructor 
public MyNetworkOperation(String url) { 
    this.url = url; 
} 

@Override 
protected void onPreExecute() { 
    super.onPreExecute(); 
} 

@Override 
protected Void doInBackground(Void... params) { 
    // Do your network operations like post, get, download, upload etc. 
    HttpClient client = new DefaultHttpClient(); 
    HttpPost post = new HttpPost(url); 
    List<NameValuePair> pairs = new ArrayList<NameValuePair>(); 
    pairs.add(new BasicNameValuePair("lighton", "")); 
    try { 
     post.setEntity(new UrlEncodedFormEntity(pairs)); 
    } catch (UnsupportedEncodingException e) { 
     e.printStackTrace(); 
    } 

    try { 
     HttpResponse response = client.execute(post); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 

    return null; 
} 

@Override 
protected void onProgressUpdate(Void... values) { 
    super.onProgressUpdate(values); 
} 

@Override 
protected void onPostExecute(Void result) { 
    super.onPostExecute(result); 
} 
} 

你怎麼能調用這個電話？看看下面

MyNetworkOperation asynctask = new MyNetworkOperation("http://192.168.1.5:80/arduino2/socket.php"); 
asynctask.execute();