Use [Ion](https://github.com/koush/ion) for http requests.

app/app.iml

@@ -83,8 +83,12 @@
     </content>
     <orderEntry type="jdk" jdkName="Android API 21 Platform" jdkType="Android SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" exported="" name="support-annotations-21.0.2" level="project" />
+    <orderEntry type="library" exported="" name="androidasync-2.0.5" level="project" />
     <orderEntry type="library" exported="" name="support-v4-21.0.2" level="project" />
+    <orderEntry type="library" exported="" name="gson-2.3" level="project" />
+    <orderEntry type="library" exported="" name="ion-2.0.5" level="project" />
+    <orderEntry type="library" exported="" name="support-annotations-21.0.2" level="project" />
+    <orderEntry type="library" exported="" name="AndroidPinning-1.0.0" level="project" />
     <orderEntry type="library" exported="" name="appcompat-v7-21.0.2" level="project" />
   </component>
 </module>

app/build.gradle

@@ -30,4 +30,6 @@ android {
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     compile 'com.android.support:appcompat-v7:21.0.2'
+    compile 'org.thoughtcrime.ssl.pinning:AndroidPinning:1.0.0'
+    compile 'com.koushikdutta.ion:ion:2.+'
 }

app/src/main/java/me/datenknoten/tueroeffner/CommandExecuter.java

@@ -1,63 +0,0 @@
-/*******************************************************************************
- * "THE VODKA-WARE LICENSE" (Revision 42):
- * Tim <tim@datenknoten.me> wrote this file.  As long as you retain this notice you
- * can do whatever you want with this stuff. If we meet some day, and you think
- * this stuff is worth it, you can buy me a vodka in return — Tim Schumacher
- ******************************************************************************/
-
-package me.datenknoten.tueroeffner;
-
-import android.os.AsyncTask;
-import android.widget.EditText;
-
-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 java.io.IOException;
-import java.net.URI;
-import java.net.URISyntaxException;
-
-/**
- * Created by tim on 27.01.2015.
- */
-public class CommandExecuter extends AsyncTask<String, Integer, Boolean> {
-    private String key = "";
-
-    public CommandExecuter(String Key) {
-        this.key = Key;
-    }
-
-    @Override
-    protected Boolean doInBackground(String... params) {
-        int count = params.length;
-
-        try {
-            for (String param : params) {
-                executeCommand(param);
-                // Escape early if cancel() is called
-                if (isCancelled()) break;
-            }
-            return true;
-        } catch (Exception e) {
-            return false;
-
-        }
-
-    }
-
-    /**
-     * Sends a command to the door server.
-     *
-     * @param cmd
-     */
-    private Boolean executeCommand(String cmd) throws IOException, URISyntaxException {
-        HttpClient client = new DefaultHttpClient();
-        HttpGet request = new HttpGet();
-        URI uri = new URI("https://tuer.hackspace-jena.de/cgi-bin/kraut.space?secret="+key+"&cmd="+cmd);
-        request.setURI(uri);
-        HttpResponse response = client.execute(request);
-        return true;
-    }
-}

app/src/main/java/me/datenknoten/tueroeffner/MainActivity.java

@@ -21,6 +21,7 @@ import android.support.v4.app.Fragment;
 import android.os.Bundle;
 import android.text.Editable;
 import android.text.TextWatcher;
+import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuItem;
@@ -38,12 +39,18 @@ import org.apache.http.client.ClientProtocolException;
 import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.impl.client.DefaultHttpClient;
+import org.thoughtcrime.ssl.pinning.PinningTrustManager;
+import org.thoughtcrime.ssl.pinning.SystemKeyStore;
 
 import java.io.IOException;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.List;
 
+import com.koushikdutta.async.future.FutureCallback;
+import com.koushikdutta.ion.Ion;
+
+import javax.net.ssl.TrustManager;
 
 
 public class MainActivity extends ActionBarActivity {
@@ -181,12 +188,7 @@ public class MainActivity extends ActionBarActivity {
      * @param v
      */
     public void buttonOpenOuterDoor(View v) {
-        try {
+        executeCommand("outdoor_buzz",v.getContext());
-            new CommandExecuter(getDoorKey()).doInBackground("outdoor_buzz");
-            Toast.makeText(v.getContext(), getString(R.string.buzzer_success), Toast.LENGTH_SHORT).show();
-        } catch (Exception e) {
-            Toast.makeText(v.getContext(), "Konnte Befehl „Buzzer“ nicht ausführen.", Toast.LENGTH_SHORT).show();
-        }
     }
 
     /**
@@ -195,12 +197,7 @@ public class MainActivity extends ActionBarActivity {
      * @param v
      */
     public void buttonOpenInnerDoor(View v) {
-        try {
+        executeCommand("indoor_unlock",v.getContext());
-            new CommandExecuter(getDoorKey()).doInBackground("indoor_unlock");
-            Toast.makeText(v.getContext(), getString(R.string.door_unlock), Toast.LENGTH_SHORT).show();
-        } catch (Exception e) {
-            Toast.makeText(v.getContext(), "Konnte Befehl „Tür aufschließen“ nicht ausführen.", Toast.LENGTH_SHORT).show();
-        }
     }
 
     /**
@@ -209,20 +206,19 @@ public class MainActivity extends ActionBarActivity {
      * @param v
      */
     public void buttonUnlockInnerDoor(View v) {
-        try {
+        executeCommand("indoor_open",v.getContext());
-            new CommandExecuter(getDoorKey()).doInBackground("indoor_open");
-            Toast.makeText(v.getContext(), getString(R.string.door_open), Toast.LENGTH_SHORT).show();
-        } catch (Exception e) {
-            Toast.makeText(v.getContext(), "Konnte Befehl „Tür öffnen“ nicht ausführen.", Toast.LENGTH_SHORT).show();
-        }
     }
 
     public void buttonLockInnerDoor(View v) {
-        try {
+        executeCommand("indoor_lock",v.getContext());
-            new CommandExecuter(getDoorKey()).doInBackground("indoor_lock");
-            Toast.makeText(v.getContext(), getString(R.string.door_open), Toast.LENGTH_SHORT).show();
-        } catch (Exception e) {
-            Toast.makeText(v.getContext(), "Konnte Befehl „Tür schließen“ nicht ausführen.", Toast.LENGTH_SHORT).show();
     }
+
+    private void executeCommand(String cmd, Context context) {
+        TrustManager[] trustManagers = new TrustManager[] { new PinningTrustManager(SystemKeyStore.getInstance(context),
+                new String[] { "F1E2BB0724ACF34E60557DE95BD3DD30BCD08817" }, 0) };
+        //Ion.getDefault(this).configure().setLogging("iontest", Log.VERBOSE);
+        Ion ion = Ion.getInstance(context, "tuer");
+        ion.getHttpClient().getSSLSocketMiddleware().setTrustManagers(trustManagers);
+        ion.with(this).load("https://tuer.krautspace.de/cgi-bin/kraut.space?secret=" + this.getDoorKey() + "&cmd=" + cmd).asString();
     }
 }

tueroeffner.iml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" type="JAVA_MODULE" version="4">
+  <component name="FacetManager">
+    <facet type="java-gradle" name="Java-Gradle">
+      <configuration>
+        <option name="BUILD_FOLDER_PATH" value="$MODULE_DIR$/build" />
+      </configuration>
+    </facet>
+  </component>
+  <component name="NewModuleRootManager" inherit-compiler-output="false">
+    <output url="file://$MODULE_DIR$/build/classes/main" />
+    <output-test url="file://$MODULE_DIR$/build/classes/test" />
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/.gradle" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
+