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POError while implementing Json in android
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  1. POError while implementing Json in android
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    copied!<p>I am new to android I am using the following code to parse the data and connect with the database and hence get the value present in the database which is present in the server.</p> <p>The code which I am using is :-</p> <pre><code>package com.example.library; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.UnsupportedEncodingException; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.json.JSONException; import org.json.JSONObject; import android.util.Log; public class JSONParser { static InputStream is = null; static JSONObject jObj = null; static String json = ""; // constructor public JSONParser() { } public JSONObject getJSONFromUrl(String url) { // Making HTTP request try { // defaultHttpClient DefaultHttpClient httpClient = new DefaultHttpClient(); HttpGet httpGet = new HttpGet(url); HttpResponse httpResponse = httpClient.execute(httpGet); HttpEntity httpEntity = httpResponse.getEntity(); is = httpEntity.getContent(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } try { BufferedReader reader = new BufferedReader(new InputStreamReader( is, "iso-8859-1"), 8); StringBuilder sb = new StringBuilder(); String line = null; while ((line = reader.readLine()) != null) { sb.append(line + "\n"); } is.close(); json = sb.toString(); &lt;------Here } catch (Exception e) { Log.e("Buffer Error", "Error converting result " + e.toString()); } // try parse the string to a JSON object try { jObj = new JSONObject(json); } catch (JSONException e) { Log.e("JSON Parser", "Error parsing data " + e.toString()); } // return JSON String return jObj; } /* public void writeJSON() { JSONObject object = new JSONObject(); try { object.put("name", "Prathamesh"); object.put("score", new Integer(200)); object.put("current", new Double(152.32)); object.put("nickname", "Programmer"); } catch (JSONException e) { e.printStackTrace(); } System.out.println(object); } */ } </code></pre> <p>I am using another code to use the value of json and display it.It is as follows:-</p> <pre><code>package com.example.library; import java.util.ArrayList; import java.util.HashMap; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.os.Bundle; public class SecondActivity extends Activity { //url to make request private static String url = "http://192.168.0.100:3000/users.json"; // JSON Node names private static final String TAG_ID = "id"; private static final String TAG_FIRST = "first_name"; private static final String TAG_MIDDLE = "middle_name"; private static final String TAG_LAST = "last_name"; private static final String TAG_EMAIL = "email"; private static final String TAG_ADDRESS = "address"; private static final String TAG_MOBILE = "mobile"; private static final String TAG_USERS = "user"; // users JSONArray JSONArray users = null; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.tab_test1); // Hashmap for ListView ArrayList&lt;HashMap&lt;String, String&gt;&gt; userList = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); // Creating JSON Parser instance JSONParser jParser = new JSONParser(); // getting JSON string from URL JSONObject json = jParser.getJSONFromUrl(url); &lt;---url I am using is http://192.168.0.100:3000/users.json try { // Getting Array of Contacts users = json.getJSONArray(TAG_USERS); // looping through All Contacts for(int i = 0; i &lt; users.length(); i++){ JSONObject c = users.optJSONObject(i); // Storing each json item in variable String id = c.getString(TAG_ID); String first = c.getString(TAG_FIRST); String middle = c.getString(TAG_MIDDLE); String last = c.getString(TAG_LAST); String email = c.getString(TAG_EMAIL); String address = c.getString(TAG_ADDRESS); String mobile = c.getString(TAG_MOBILE); // creating new HashMap HashMap&lt;String, String&gt; map = new HashMap&lt;String, String&gt;(); // adding each child node to HashMap key =&gt; value map.put(TAG_ID, id); map.put(TAG_FIRST, first); map.put(TAG_MIDDLE,middle); map.put(TAG_LAST, last); map.put(TAG_ADDRESS, address); map.put(TAG_MOBILE, mobile); map.put(TAG_EMAIL, email); // adding HashList to ArrayList userList.add(map); } } catch (JSONException e) { e.printStackTrace(); } } } </code></pre> <p>My error log file is:-</p> <pre><code>04-30 16:24:05.697: E/AndroidRuntime(687): FATAL EXCEPTION: main 04-30 16:24:05.697: E/AndroidRuntime(687): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.library/com.example.library.SecondActivity}: java.lang.IllegalArgumentException: HTTP entity may not be null 04-30 16:24:05.697: E/AndroidRuntime(687): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 04-30 16:24:05.697: E/AndroidRuntime(687): at android.app.ActivityThread.startActivityNow(ActivityThread.java:1487) 04-30 16:24:05.697: E/AndroidRuntime(687): at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127) 04-30 16:24:05.697: E/AndroidRuntime(687): at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339) 04-30 16:24:05.697: E/AndroidRuntime(687): at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:654) 04-30 16:24:05.697: E/AndroidRuntime(687): at android.widget.TabHost.setCurrentTab(TabHost.java:326) 04-30 16:24:05.697: E/AndroidRuntime(687): at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:132) 04-30 16:24:05.697: E/AndroidRuntime(687): at android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:456) 04-30 16:24:05.697: E/AndroidRuntime(687): at android.view.View.performClick(View.java:2485) 04-30 16:24:05.697: E/AndroidRuntime(687): at android.view.View$PerformClick.run(View.java:9080) 04-30 16:24:05.697: E/AndroidRuntime(687): at android.os.Handler.handleCallback(Handler.java:587) 04-30 16:24:05.697: E/AndroidRuntime(687): at android.os.Handler.dispatchMessage(Handler.java:92) 04-30 16:24:05.697: E/AndroidRuntime(687): at android.os.Looper.loop(Looper.java:123) 04-30 16:24:05.697: E/AndroidRuntime(687): at android.app.ActivityThread.main(ActivityThread.java:3683) 04-30 16:24:05.697: E/AndroidRuntime(687): at java.lang.reflect.Method.invokeNative(Native Method) 04-30 16:24:05.697: E/AndroidRuntime(687): at java.lang.reflect.Method.invoke(Method.java:507) 04-30 16:24:05.697: E/AndroidRuntime(687): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 04-30 16:24:05.697: E/AndroidRuntime(687): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 04-30 16:24:05.697: E/AndroidRuntime(687): at dalvik.system.NativeStart.main(Native Method) 04-30 16:24:05.697: E/AndroidRuntime(687): Caused by: java.lang.IllegalArgumentException: HTTP entity may not be null 04-30 16:24:05.697: E/AndroidRuntime(687): at org.apache.http.util.EntityUtils.toString(EntityUtils.java:110) 04-30 16:24:05.697: E/AndroidRuntime(687): at org.apache.http.util.EntityUtils.toString(EntityUtils.java:146) 04-30 16:24:05.697: E/AndroidRuntime(687): at com.example.library.JSONParser.getJSONFromUrl(JSONParser.java:55) 04-30 16:24:05.697: E/AndroidRuntime(687): at com.example.library.SecondActivity.onCreate(SecondActivity.java:51) 04-30 16:24:05.697: E/AndroidRuntime(687): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 04-30 16:24:05.697: E/AndroidRuntime(687): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) </code></pre> <p>While using the code <code>json = sb.toString();</code> I am get the value.whereas json is calling some values from the database from the second code.</p> <p>Please help me and let me know if there is anything wrong with the code</p>
 

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