Added a simple example originally modified from javacodegeeks.com

GsonJsonWebservice/AndroidManifest.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      android:versionCode="1"
+      android:versionName="1.0" package="com.novoda">
+
+    <application android:icon="@drawable/icon" android:label="@string/app_name">
+        <activity android:name="com.novoda.activity.JsonRequest"
+                  android:label="@string/app_name">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+    </application>
+
+    <uses-sdk android:minSdkVersion="3" />
+    <uses-permission android:name="android.permission.INTERNET"></uses-permission>
+
+</manifest> 

GsonJsonWebservice/res/layout/main.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent" >
+	<TextView  
+		android:id="@+id/search"
+    	android:layout_width="fill_parent" 
+    	android:layout_height="wrap_content"  />
+    <ListView
+    	android:id="@+id/list"
+    	android:layout_width="fill_parent"
+    	android:layout_height="fill_parent" />
+
+</LinearLayout>

GsonJsonWebservice/res/values/strings.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="hello">Hello World, JsonParsingActivity!</string>
+    <string name="app_name">JsonParser</string>
+</resources>

GsonJsonWebservice/src/com/novoda/activity/JsonRequest.java

@@ -0,0 +1,89 @@
+package com.novoda.activity;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.List;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.HttpResponse;
+import org.apache.http.HttpStatus;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.DefaultHttpClient;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.util.Log;
+import android.widget.ArrayAdapter;
+import android.widget.ListView;
+import android.widget.SimpleAdapter;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.google.gson.Gson;
+import com.novoda.R;
+import com.novoda.model.Result;
+import com.novoda.model.SearchResponse;
+
+public class JsonRequest extends Activity {
+
+	private static final String SEARCH = "Droidcon";
+	String url = "http://search.twitter.com/search.json?q=" + SEARCH;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.main);
+        ((TextView)findViewById(R.id.search)).setText("Searching for: " + SEARCH);
+    }
+
+    @Override
+    protected void onResume() {
+    	super.onResume();
+    	Toast.makeText(this, "Querying droidcon on Twitter", Toast.LENGTH_SHORT).show();
+
+        Reader reader = new InputStreamReader(retrieveStream(url));
+        SearchResponse response = new Gson().fromJson(reader, SearchResponse.class);
+
+        List<String> searches = new ArrayList<String>();
+        Iterator<Result> i = response.results.iterator();
+        while(i.hasNext()){
+        	Result res = (Result )i.next();
+        	searches.add(res.text);
+        }
+
+        ListView v = (ListView)findViewById(R.id.list);
+        v.setAdapter(new ArrayAdapter<String>(this,
+        		android.R.layout.simple_list_item_1, searches.toArray(new String[searches.size()])));
+    }
+
+    private InputStream retrieveStream(String url) {
+
+    	DefaultHttpClient client = new DefaultHttpClient(); 
+        HttpGet getRequest = new HttpGet(url);
+
+        try {
+
+           HttpResponse getResponse = client.execute(getRequest);
+           final int statusCode = getResponse.getStatusLine().getStatusCode();
+
+           if (statusCode != HttpStatus.SC_OK) { 
+              Log.w(getClass().getSimpleName(), "Error " + statusCode + " for URL " + url); 
+              return null;
+           }
+
+           HttpEntity getResponseEntity = getResponse.getEntity();
+           return getResponseEntity.getContent();
+
+        } 
+        catch (IOException e) {
+           getRequest.abort();
+           Log.w(getClass().getSimpleName(), "Error for URL " + url, e);
+        }
+        return null;
+     }
+}

GsonJsonWebservice/src/com/novoda/model/Metadata.java

@@ -0,0 +1,10 @@
+package com.novoda.model;
+
+import com.google.gson.annotations.SerializedName;
+
+public class Metadata {
+
+	@SerializedName("result_type")
+	public String resultType;
+
+}

GsonJsonWebservice/src/com/novoda/model/Result.java

@@ -0,0 +1,42 @@
+package com.novoda.model;
+
+import com.google.gson.annotations.SerializedName;
+
+public class Result {
+
+	@SerializedName("from_user_id_str")
+	public String fromUserIdStr;
+
+	@SerializedName("profile_image_url")
+	public String profileImageUrl;
+
+	@SerializedName("created_at")
+	public String createdAt;
+
+	@SerializedName("from_user")
+	public String fromUser;
+
+	@SerializedName("id_str")
+	public String idStr;
+
+	public Metadata metadata;
+
+	@SerializedName("to_user_id")
+	public String toUserId;
+
+	public String text;
+
+	public long id;
+
+	@SerializedName("from_user_id")
+	public String from_user_id;
+
+	@SerializedName("iso_language_code")
+	public String isoLanguageCode;
+
+	@SerializedName("to_user_id_str")
+	public String toUserIdStr;
+
+	public String source;
+
+}

GsonJsonWebservice/src/com/novoda/model/SearchResponse.java

@@ -0,0 +1,39 @@
+package com.novoda.model;
+
+import java.util.List;
+
+import com.google.gson.annotations.SerializedName;
+
+public class SearchResponse {
+
+	public List<Result> results;
+
+	@SerializedName("max_id")
+	public long maxId;
+
+	@SerializedName("since_id")
+	public int sinceId;
+
+	@SerializedName("refresh_url")
+	public String refreshUrl;
+
+	@SerializedName("next_page")
+	public String nextPage;
+
+	@SerializedName("results_per_page")
+	public int resultsPerPage;
+
+	public int page;
+
+	@SerializedName("completed_in")
+	public double completedIn;
+
+	@SerializedName("since_id_str")
+	public String sinceIdStr;
+
+	@SerializedName("max_id_str")
+	public String maxIdStr;
+
+	public String query;
+
+}