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POREST request on Android
 

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  1. POREST request on Android
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    <p>I'm writing my first Android app where the first thing to do is collect a list of maps from a server, but I'm having difficulty getting a simple REST request working. I've been following a number of tutorials and am trying to employ both AsyncTask and HttpURLConnection to do this properly.</p> <p>For my simple initial test, I just call <code>getMapsJson</code>, with <code>serverUrl</code> set to "<a href="http://httpbin.org/ip" rel="nofollow">http://httpbin.org/ip</a>" (just to make sure it's sending and receiving data correctly).</p> <p><strong>Code</strong></p> <pre><code>public String getMapsJson() { Log.d(Globals.tag, "&gt;&gt; getting maps json from " + serverUrl.toString()); String output = ""; new GetMapsJsonTask().execute(serverUrl); return output; } private class GetMapsJsonTask extends AsyncTask&lt;URL, Void, String&gt; { private HttpURLConnection connection = null; protected String doInBackground(URL... url) { String output = ""; try { connection = (HttpURLConnection) url[0].openConnection(); connection.setRequestMethod("GET"); Log.d(Globals.tag, "connection opened!"); InputStream in = new BufferedInputStream(connection.getInputStream()); Log.d(Globals.tag, "input stream captured"); output = readStream(in); Log.d(Globals.tag, "stream read"); } catch (IOException e) { Log.d(Globals.tag, (e.getMessage() == null ? "IO Exception" : "IO : " + e.getMessage())); } finally { return output; } } protected void onPostExecute(String json) { Log.d(Globals.tag, "Json response: " + json); } } private String readStream(InputStream in) throws IOException { Log.d(Globals.tag, "entering readStream"); BufferedReader reader = new BufferedReader(new InputStreamReader(in)); String line = reader.readLine(); String output = line; while((line = reader.readLine()) != null) output += line; return output; } </code></pre> <p><strong>AndroidManifest.xml</strong></p> <p>I have the android.permission.INTERNET line in there, but I'm not positive it's in the correct location. May cause issues?</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.northstar.minimap" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="17" android:targetSdkVersion="17" /&gt; &lt;uses-permission android:name="android.permission.INTERNET" /&gt; &lt;application android:name="com.northstar.minimap.Globals" android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" &gt; &lt;activity android:name="com.northstar.minimap.MainActivity" android:label="@string/app_name" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;activity android:name="com.northstar.minimap.MapActivity" android:label="@string/title_activity_map" android:parentActivityName="com.northstar.minimap.MainActivity" &gt; &lt;meta-data android:name="android.support.PARENT_ACTIVITY" android:value="com.northstar.minimap.MainActivity" /&gt; &lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p><strong>Output</strong></p> <p>Logcat yields the following lines:</p> <pre><code>12-01 21:31:44.727 2188-2188/com.northstar.minimap D/Minimap﹕ &gt;&gt; getting maps json from http://httpbin.org/ip/ 12-01 21:31:44.727 2188-2232/com.northstar.minimap D/Minimap﹕ connection opened! 12-01 21:31:45.106 2188-2232/com.northstar.minimap D/Minimap﹕ IO: http://httpbin.org/ip/ 12-01 21:31:45.106 2188-2188/com.northstar.minimap D/Minimap﹕ Json response: </code></pre> <p>Basically, something's causing an IOException, and I'm not sure what - the exception's getMessage isn't exactly verbose. Do I have to do any configuration for the emulator (JellyBean, API level 17)?</p> <p>Thanks!</p>
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    1. USBenjin
    1. USBenjin
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      1. VTUpMod
    1. COCheck out this tutorial on reading from an HttpUrlConnection inputStream, http://docs.oracle.com/javase/tutorial/networking/urls/readingWriting.html
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      1. USSelecsosi
    2. COHave you tried it on a real device -do you get the same error?
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      1. POREST request on Android
      1. USMike
    3. CO@Selecsosi Just tried the lines used in that link; same exception. Also, the writing method described there doesn't look particularly REST-friendly (multiple Android+REST tutorials pointed to the methods I'm currently using).
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      1. USBenjin
 

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