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POcall java class with click on a button
 

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    <p>I am trying to call another class called HttpUtilityTester.java from Mainactivity.java. Actually I'd like to test HttpUtility.sendPostRequest from HttpUtility.java with a click on a button. The spot is marked with this comment: "//here I need help from stackoverflow"</p> <p>This is already added to my button in the activity_main.xml:</p> <pre><code>android:onClick="sendMessage1" </code></pre> <p>here is Mainactivity.java:</p> <pre><code> package com.example.mythirdapp; import android.app.Activity; import android.os.Bundle; public class MainActivity extends Activity { //here I need help from stackoverflow @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } } </code></pre> <p>here is HttpUtility.java:</p> <pre><code> package com.example.mythirdapp; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLEncoder; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import java.util.Map; public class HttpUtility { /** * Represents an HTTP connection */ private static HttpURLConnection httpConn; /** * Makes an HTTP request using GET method to the specified URL. * * @param requestURL * the URL of the remote server * @return An HttpURLConnection object * @throws IOException * thrown if any I/O error occurred */ public static HttpURLConnection sendGetRequest(String requestURL) throws IOException { URL url = new URL(requestURL); httpConn = (HttpURLConnection) url.openConnection(); httpConn.setUseCaches(false); httpConn.setDoInput(true); // true if we want to read server's response httpConn.setDoOutput(false); // false indicates this is a GET request return httpConn; } /** * Makes an HTTP request using POST method to the specified URL. * * @param requestURL * the URL of the remote server * @param params * A map containing POST data in form of key-value pairs * @return An HttpURLConnection object * @throws IOException * thrown if any I/O error occurred */ public static HttpURLConnection sendPostRequest(String requestURL, Map&lt;String, String&gt; params) throws IOException { URL url = new URL(requestURL); httpConn = (HttpURLConnection) url.openConnection(); httpConn.setUseCaches(false); httpConn.setDoInput(true); // true indicates the server returns response StringBuffer requestParams = new StringBuffer(); if (params != null &amp;&amp; params.size() &gt; 0) { httpConn.setDoOutput(true); // true indicates POST request // creates the params string, encode them using URLEncoder Iterator&lt;String&gt; paramIterator = params.keySet().iterator(); while (paramIterator.hasNext()) { String key = paramIterator.next(); String value = params.get(key); requestParams.append(URLEncoder.encode(key, "UTF-8")); requestParams.append("=").append( URLEncoder.encode(value, "UTF-8")); requestParams.append("&amp;"); } // sends POST data OutputStreamWriter writer = new OutputStreamWriter( httpConn.getOutputStream()); writer.write(requestParams.toString()); writer.flush(); } return httpConn; } /** * Returns only one line from the server's response. This method should be * used if the server returns only a single line of String. * * @return a String of the server's response * @throws IOException * thrown if any I/O error occurred */ public static String readSingleLineRespone() throws IOException { InputStream inputStream = null; if (httpConn != null) { inputStream = httpConn.getInputStream(); } else { throw new IOException("Connection is not established."); } BufferedReader reader = new BufferedReader(new InputStreamReader( inputStream)); String response = reader.readLine(); reader.close(); return response; } /** * Returns an array of lines from the server's response. This method should * be used if the server returns multiple lines of String. * * @return an array of Strings of the server's response * @throws IOException * thrown if any I/O error occurred */ public static String[] readMultipleLinesRespone() throws IOException { InputStream inputStream = null; if (httpConn != null) { inputStream = httpConn.getInputStream(); } else { throw new IOException("Connection is not established."); } BufferedReader reader = new BufferedReader(new InputStreamReader( inputStream)); List&lt;String&gt; response = new ArrayList&lt;String&gt;(); String line = ""; while ((line = reader.readLine()) != null) { response.add(line); } reader.close(); return (String[]) response.toArray(new String[0]); } /** * Closes the connection if opened */ public static void disconnect() { if (httpConn != null) { httpConn.disconnect(); } } } </code></pre> <p>here is HttpUtilityTester.java:</p> <pre><code> package com.example.mythirdapp; import java.io.IOException; import java.util.HashMap; import java.util.Map; public class HttpUtilityTester {public static void main(String[] args) { // test sending GET request String requestURL = "http://www.google.com"; try { HttpUtility.sendGetRequest(requestURL); String[] response = HttpUtility.readMultipleLinesRespone(); for (String line : response) { System.out.println(line); } } catch (IOException ex) { ex.printStackTrace(); } HttpUtility.disconnect(); System.out.println("====================================="); // test sending POST request Map&lt;String, String&gt; params = new HashMap&lt;String, String&gt;(); requestURL = "https://accounts.google.com/ServiceLoginAuth"; params.put("Email", "your_email"); params.put("Passwd", "your_password"); try { HttpUtility.sendPostRequest(requestURL, params); String[] response = HttpUtility.readMultipleLinesRespone(); for (String line : response) { System.out.println(line); } } catch (IOException ex) { ex.printStackTrace(); } HttpUtility.disconnect(); } } </code></pre> <p>I tried to add code of the HttpUtilityTester.java to my Mainactivity.java like this:</p> <pre><code>...public class MainActivity extends Activity { public void sendMessage1(View v){ // test sending POST request Map&lt;String, String&gt; params = new HashMap&lt;String, String&gt;(); requestURL = "https://accounts.google.com/ServiceLoginAuth"; params.put("Email", "your_email"); params.put("Passwd", "your_password"); try { HttpUtility.sendPostRequest(requestURL, params); String[] response = HttpUtility.readMultipleLinesRespone(); for (String line : response) { System.out.println(line); } } catch (IOException ex) { ex.printStackTrace(); } HttpUtility.disconnect(); }... </code></pre> <p>But logcat sais: "could not execute method of the activity" </p>
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