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POJSON GSON from http
 

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  1. POJSON GSON from http
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    <p>the following code is not working for me. Can you tel me where I am going wrong...</p> <pre><code>public class HttpActivity extends Activity { /** Called when the activity is first created. */ /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.listplaceholder); ListView lv= (ListView)findViewById(R.id.list); Gson gson = new Gson(); try { HttpClient httpclient = new DefaultHttpClient(); HttpGet httpget = new HttpGet("http://......."); HttpResponse response = httpclient.execute(httpget); BufferedReader br = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); DataObject[] obj = gson.fromJson(br, DataObject[].class); List&lt;HashMap&lt;String, String&gt;&gt; fillMaps = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); for(int i=0 ; i&lt;obj.length ; i++){ HashMap&lt;String, String&gt; map = new HashMap&lt;String, String&gt;(); map.put("AC", obj[i].AC); map.put("Fleet", obj[i].Fleet ); map.put("SubFleet", obj[i].SubFleet ); fillMaps.add(map); } SimpleAdapter adapter = new SimpleAdapter(this, fillMaps, R.layout.main, new String[] {"AC", "Fleet", "SubFleet"}, new int[] {R.id.ac, R.id.fleet, R.id.subfleet}); lv.setAdapter(adapter); } catch (IOException e) { e.printStackTrace(); } } } </code></pre> <p>DataObject.java</p> <pre><code>import com.google.gson.annotations.SerializedName; </code></pre> <p>public class DataObject {</p> <pre><code> @SerializedName("AC") public String AC; @SerializedName("Fleet") public String Fleet; @SerializedName("SubFleet") public String SubFleet; public DataObject(String AC, String Fleet, String SubFleet) { this.AC = AC; this.Fleet = Fleet; this.SubFleet = SubFleet; } public String toString() { return this.AC + this.Fleet + this.SubFleet; } </code></pre> <p>}</p> <p>Output does not show anything.</p> <hr> <p>Thanks for replying. This is my JSON file.</p> <pre><code>[{"AC":"200","Fleet":"MD80","SubFleet":"83G"},{"AC":"201","Fleet":"MD80","SubFleet":"83G"},{"AC":"202","Fleet":"MD80","SubFleet":"83G"},{"AC":"262","Fleet":"MD80","SubFleet":"S80"},{"AC":"271","Fleet":"MD80","SubFleet":"S80"},{"AC":"278","Fleet":"MD80","SubFleet":"S80"},{"AC":"319","Fleet":"B767","SubFleet":"76ER"},{"AC":"320","Fleet":"B767","SubFleet":"76ER"},{"AC":"321","Fleet":"B767","SubFleet":"76ER"}] </code></pre> <p>And this program worked for me.</p> <pre><code>public class HttpActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.listplaceholder); ListView lv= (ListView)findViewById(R.id.list); String response = "[{\"AC\":\"200\",\"Fleet\":\"MD80\",\"SubFleet\":\"83G\"}, {\"AC\":\"201\",\"Fleet\":\"MD80\",\"SubFleet\":\"83G\"}]"; Gson gson = new Gson(); DataObject[] obj = gson.fromJson(response, DataObject[].class); String str = gson.fromJson("\"ABC\"", String.class); List&lt;HashMap&lt;String, String&gt;&gt; fillMaps = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); for(int i=0 ; i&lt;obj.length ; i++){ HashMap&lt;String, String&gt; map = new HashMap&lt;String, String&gt;(); map.put("AC", obj[i].AC); map.put("Fleet", obj[i].Fleet ); map.put("SubFleet", obj[i].SubFleet ); fillMaps.add(map); } SimpleAdapter adapter = new SimpleAdapter(this, fillMaps, R.layout.main, new String[] {"AC", "Fleet", "SubFleet"}, new int[] {R.id.ac, R.id.fleet, R.id.subfleet}); lv.setAdapter(adapter); </code></pre> <p>That means it's working with string object. and JSON GSON is working. So what's wrong with Http ? </p>
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    1. CODo I need to deserialize it ?
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    2. COCan we get more information on what is going wrong? Is the Hashmap filling with data? Is `obj` full of data? Does the for loop get called, or is `obj.length` null or 0?
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    3. COFileNotFoundException and JsonParseException
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