I want to change my radio button text in android app with a value from the json object…
the q_desc textView changes… but not the the text of the radio buttons…The application after changing the q_desc text view force closes….what is my error..??? I have provided my jsp page, activity as well as my log cat..
This is my jsp code….
<%@page contentType="text/html; charset=UTF-8"%>
<%@page import="org.json.simple.JSONObject"%>
<%@page import="java.util.*,java.sql.*"%>
<%!
Connection con;
PreparedStatement ps;
ResultSet rs;
String x;
%>
<%
Class.forName("oracle.jdbc.driver.OracleDriver");
con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl","pro","pro");
ps=con.prepareStatement("select * from c_question where id=1");
rs=ps.executeQuery();
JSONObject obj=new JSONObject();
obj.put("id",rs.getString(1));
obj.put("desc",rs.getString(2));
obj.put("a",rs.getString(3));
obj.put("b",rs.getString(4));
obj.put("c",rs.getString(5));
obj.put("d",rs.getString(6));
out.print(obj);
out.flush();
%>
This is my activity…
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
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.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
public class JsonDemo extends Activity
{
JSONObject json;
HttpClient client;
TextView q_desc;
RadioButton rb_a;
RadioButton rb_b;
RadioButton rb_c;
RadioButton rb_d;
RadioGroup rg;
final static String URL="http://10.0.2.2:7001/project/json.jsp";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.result_json);
q_desc=(TextView)findViewById(R.id.q_desc);
rb_a=(RadioButton)findViewById(R.id.opt_a);
rb_b=(RadioButton)findViewById(R.id.opt_b);
rb_c=(RadioButton)findViewById(R.id.opt_c);
rb_d=(RadioButton)findViewById(R.id.opt_d);
client=new DefaultHttpClient();
new Read().execute("desc","a","b","c","d");
}
public JSONObject getData()throws ClientProtocolException,IOException,JSONException
{
StringBuilder url=new StringBuilder(URL);
HttpGet get=new HttpGet(url.toString());
HttpResponse r=client.execute(get);
int status=r.getStatusLine().getStatusCode();
if(status == 200)
{
HttpEntity e=r.getEntity();
String data=EntityUtils.toString(e);
JSONObject last=new JSONObject(data);
return last;
}
else
{
Toast.makeText(JsonDemo.this, "error", Toast.LENGTH_SHORT);
return null;
}
}
public class Read extends AsyncTask<String,Integer,String>
{
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
try {
json=getData();
String desc=json.getString(params[0]);
String option_a=json.getString(params[1]);
String option_b=json.getString(params[2]);
String option_c=json.getString(params[3]);
String option_d=json.getString(params[4]);
set_ques(desc);
set_options(option_a,option_b,option_c,option_d);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
protected void set_ques(String desc) {
// TODO Auto-generated method stub
q_desc.setText(desc);
}
protected void set_options(String a,String b,String c,String d) {
// TODO Auto-generated method stub
rb_a.setText(a);
rb_b.setText(b);
rb_c.setText(c);
rb_d.setText(d);
}
}
this is the log cat….
04-05 22:17:52.198: W/dalvikvm(445): threadid=7: thread exiting with uncaught exception (group=0x4001d800)
04-05 22:17:52.968: E/AndroidRuntime(445): FATAL EXCEPTION: AsyncTask #1
04-05 22:17:52.968: E/AndroidRuntime(445): java.lang.RuntimeException: An error occured while executing doInBackground()
04-05 22:17:52.968: E/AndroidRuntime(445): at android.os.AsyncTask$3.done(AsyncTask.java:200)
04-05 22:17:52.968: E/AndroidRuntime(445): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
04-05 22:17:52.968: E/AndroidRuntime(445): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
04-05 22:17:52.968: E/AndroidRuntime(445): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
04-05 22:17:52.968: E/AndroidRuntime(445): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
04-05 22:17:52.968: E/AndroidRuntime(445): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
04-05 22:17:52.968: E/AndroidRuntime(445): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
04-05 22:17:52.968: E/AndroidRuntime(445): at java.lang.Thread.run(Thread.java:1096)
04-05 22:17:52.968: E/AndroidRuntime(445): Caused by: android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
04-05 22:17:52.968: E/AndroidRuntime(445): at android.view.ViewRoot.checkThread(ViewRoot.java:2802)
04-05 22:17:52.968: E/AndroidRuntime(445): at android.view.ViewRoot.invalidateChild(ViewRoot.java:607)
04-05 22:17:52.968: E/AndroidRuntime(445): at android.view.ViewRoot.invalidateChildInParent(ViewRoot.java:633)
04-05 22:17:52.968: E/AndroidRuntime(445): at android.view.ViewGroup.invalidateChild(ViewGroup.java:2505)
04-05 22:17:52.968: E/AndroidRuntime(445): at android.view.View.invalidate(View.java:5139)
04-05 22:17:52.968: E/AndroidRuntime(445): at android.widget.TextView.checkForRelayout(TextView.java:5364)
04-05 22:17:52.968: E/AndroidRuntime(445): at android.widget.TextView.setText(TextView.java:2688)
04-05 22:17:52.968: E/AndroidRuntime(445): at android.widget.TextView.setText(TextView.java:2556)
04-05 22:17:52.968: E/AndroidRuntime(445): at android.widget.TextView.setText(TextView.java:2531)
04-05 22:17:52.968: E/AndroidRuntime(445): at com.campuspro.start.JsonDemo$Read.set_ques(JsonDemo.java:122)
04-05 22:17:52.968: E/AndroidRuntime(445): at com.campuspro.start.JsonDemo$Read.doInBackground(JsonDemo.java:101)
04-05 22:17:52.968: E/AndroidRuntime(445): at com.campuspro.start.JsonDemo$Read.doInBackground(JsonDemo.java:1)
04-05 22:17:52.968: E/AndroidRuntime(445): at android.os.AsyncTask$2.call(AsyncTask.java:185)
04-05 22:17:52.968: E/AndroidRuntime(445): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
04-05 22:17:52.968: E/AndroidRuntime(445): ... 4 more
write this in
OnPostExecute(...)Becausedoinbackground is non UI threadso you cant update your view …and after you get data from URL and its done and finally
OnPostExecuteis called so add this….