Databases
StackOverflow2013
Postsdbo
POHTTPGet works in Java but not Android
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHTTPGet works in Java but not Android
    primarykey
    data
    text
    <p>I am working in Android and I am having trouble with a chunk of code: </p> <pre><code>public static void main(String[] args) { HttpClient httpClient = new DefaultHttpClient(); HttpContext localContext = new BasicHttpContext(); HttpGet httpGet = new HttpGet("http://9.42.68.71:8080/resources/dashboard?dashboard=rack"); String text = null; try { HttpResponse response = httpClient.execute(httpGet, localContext); HttpEntity entity = response.getEntity(); text = getASCIIContentFromEntity(entity); } catch (Exception e) { } System.out.println(text); } </code></pre> <p>This chunk of code runs correctly on a different project in Java. The problem is that when I try to use this chunk of code in Android it errors out. </p> <pre><code>FATAL EXCEPTION: main java.lang.IllegalStateException: Could not execute method of the activity at android.view.View$1.onClick(View.java:3633) at android.view.View.performClick(View.java:4240) at android.view.View$PerformClick.run(View.java:17721) at android.os.Handler.handleCallback(Handler.java:730) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:5103) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:525) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.reflect.InvocationTargetException at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:525) at android.view.View$1.onClick(View.java:3628) ... 11 more Caused by: java.lang.NullPointerException at com.android.internal.os.LoggingPrintStream.println(LoggingPrintStream.java:298) at com.example.mgen.MgenActivity.renew(MgenActivity.java:61) at com.example.mgen.MgenActivity.refresh(MgenActivity.java:44) ... 14 more </code></pre> <p>I have the same imports on both projects. Has anyone seen an issue like this or an exception like this? I can't seem to find anything similar anywhere. </p> <p>Also I have a VPN into the local 9. network and I can access it both from the android vm internet browser and my local laptop. </p> <p>I have also troubleshot to find the issue on the Android version is on the line </p> <pre><code>HttpResponse response = httpClient.execute(httpGet, localContext); </code></pre> <p>More complete code: </p> <pre><code>package com.example.mgen; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.protocol.BasicHttpContext; import org.apache.http.protocol.HttpContext; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.ArrayAdapter; import android.widget.ListView; public class MgenActivity extends Activity { ArrayList&lt;mgenObject&gt; listItems = new ArrayList&lt;mgenObject&gt;(); ArrayAdapter&lt;mgenObject&gt; adapter; public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); adapter = new ArrayAdapter&lt;mgenObject&gt;(this, android.R.layout.simple_list_item_1, listItems); ListView lv = (ListView) findViewById(R.id.list); lv.setAdapter(adapter); renew(); } // METHOD WHICH WILL HANDLE DYNAMIC INSERTION public void refresh(View v) { listItems = renew(); adapter.notifyDataSetChanged(); System.out.println("refresh worked"); } public ArrayList&lt;mgenObject&gt; renewTest() { mgenObject object = new mgenObject("test", "test", "test"); ArrayList&lt;mgenObject&gt; list = new ArrayList&lt;mgenObject&gt;(); list.add(object); return list; } public ArrayList&lt;mgenObject&gt; renew() { ArrayList&lt;mgenObject&gt; tempList = new ArrayList&lt;mgenObject&gt;(); String jsonStr = getMgenJSON(); System.out.println(jsonStr); try { JSONArray rows = new JSONArray(jsonStr); // Parse the JSON to a // JSONArray for (int i = 0; i &lt; rows.length(); i++) { // Loop over each each row JSONObject element = rows.getJSONObject(i); // Get row object String workflow = element.getString("workflow_state"); String vgen = element.getString("vgen_state"); String name = element.getString("title"); mgenObject tempObject = new mgenObject(name, workflow, vgen); tempList.add(tempObject); } } catch (JSONException e) { // JSON Parsing error e.printStackTrace(); } return tempList; } public String getMgenJSON() { HttpClient httpClient = new DefaultHttpClient(); HttpContext localContext = new BasicHttpContext(); HttpGet httpGet = new HttpGet( "http://9.42.68.71:8080/resources/dashboard?dashboard=rack"); String text = null; try { System.out.println("testing3"); HttpResponse response = httpClient.execute(new HttpGet("http://9.42.68.71:8080/resources/dashboard?dashboard=rack")); System.out.println("testing3.5"); HttpEntity entity = response.getEntity(); System.out.println("testing4"); text = getASCIIContentFromEntity(entity); System.out.println("testing5"); } catch (Exception e) { return e.getLocalizedMessage(); } System.out.println(text); return text; } protected String getASCIIContentFromEntity(HttpEntity entity) throws IllegalStateException, IOException { InputStream in = entity.getContent(); StringBuffer out = new StringBuffer(); int n = 1; while (n &gt; 0) { byte[] b = new byte[4096]; n = in.read(b); if (n &gt; 0) out.append(new String(b, 0, n)); } return out.toString(); } } </code></pre> <p>Also if you cannot tell, I am trying to make this call when a button is clicked.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USBggreen
    1. USBggreen
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POHTTPGet works in Java but not Android
      1. This table or related slice is empty.
      1. VTDownMod
    1. COYour error here is in some function called renew, which is dereferencing a null pointer. You haven't showed us code for that. However, I can tell you this code won't work- in Android, you can't do network IO on the main thread. You have to do it on another thread or AsyncTask. Also, there is no main() in Android, so I assume this is being called from somewhere.
      singulars
      1. POHTTPGet works in Java but not Android
      1. USGabe Sechan
    2. COThe Null pointer is coming from the lines String jsonStr = getMgenJSON(); System.out.println(jsonStr); I don't think this is the root issue
      singulars
      1. POHTTPGet works in Java but not Android
      1. USBggreen
    3. COSystem.out isn't the Android way to print to the log. That would be Log.d. So I wouldn't be shocked if out is null and is only there for compatibility.
      singulars
      1. POHTTPGet works in Java but not Android
      1. USGabe Sechan
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload