button on click not work

See more:

Java

Mobile

Android

i want to set button on click in my list
first i will retrieve form data base (MySQL)name-id-number of student
then display it as list with 2 buttons
the problem is how to but on click listener i try lots of example and
i do not know what is the problem i try to do on item click but it is not work
and no error happened
look at delete button

package com.ksu.sms;

import android.os.Bundle;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.List;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.util.Log;
import android.view.View;

import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;

import android.widget.SimpleAdapter;

import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
 


public class ManageSection extends ListActivity {

//ProgresogressDialog pDialog;

    private ProgressDialog pDialog;
 
    // Creating JSON Parser object
  
// Creating JSON Parser object
JSONParser jParser = new JSONParser(); //class
boolean x =true; 
Button delete;

ArrayList<HashMap<String, String>> studentList;

//url to get all products list
private static String url_all_student = "http://10.0.2.2/SmsPhp/view_student_info.php";
String cl;
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_student = "student";
private static final String TAG_StudentID = "StudentID";
private static final String TAG_StudentNo = "StudentNo";
private static final String TAG_FullName = "FullName";
private static final String  TAG_Avatar="Avatar";
HashMap<String, String> selected_student;
// course JSONArray
JSONArray student = null;
private TextView mDateDisplay;
private int mYear;
private int mMonth;
private int mDay;
ImageView imageView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.manage_section);
        mDateDisplay = (TextView) findViewById(R.id.day);
  	  
        // add a click listener to the button
    
        // get the current date
        
        final Calendar c = Calendar.getInstance();
       mYear = c.get(Calendar.YEAR);
      mMonth = c.get(Calendar.MONTH);
        mDay = c.get(Calendar.DAY_OF_MONTH);
        mDateDisplay.setText(mDay+"-"+mMonth+"-"+mYear);

	
        studentList = new ArrayList<HashMap<String, String>>();
        //image

        //imageView = new ImageView(this);
       // imageView = (ImageView)findViewById(R.id.imageView1);
      //  Drawable image = ImageOperations(this, path, getid+"."+getnamep);
       // imageView.setImageDrawable(image);
  
        ListView list1 = getListView();
        list1.setAdapter(getListAdapter());  
        list1.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int pos, long l) {
              
            	 selected_student =(HashMap<String, String>) studentList.get(pos); //member of your activity.
            	 delete =(Button)view.findViewById(R.id.DeleteStudent);
            	 cl=selected_student.get(TAG_StudentID);

            	 delete.setOnClickListener(new View.OnClickListener()

                 	{

                 		public void onClick(View v) {
                 			
                 			Log.d("id: ",cl);
                 		   	Toast.makeText(getBaseContext(),cl,Toast.LENGTH_LONG).show();
                 		}
                 });
            }

        });
      
      


        new LoadAllstudent().execute();
        
          
    }


    /**
     * Background Async Task to Load all student by making HTTP Request
     * */
    class LoadAllstudent extends AsyncTask<String, String, String>
    {
   
        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(ManageSection.this);
            pDialog.setMessage("Loading student. Please wait...");
            pDialog.setIndeterminate(false);
                  }
              
        
        
        
        /**
         * getting All student from u r l
         * */
		@Override
		protected String doInBackground(String... args) {
	        // Building Parameters
	        List<NameValuePair> params = new ArrayList<NameValuePair>();
	        // getting JSON string from URL
	        JSONObject json = jParser.makeHttpRequest(url_all_student, "GET", params);

	        // Check your log cat for JSON response
	        Log.d("All student : ", json.toString());

	        try {
	            // Checking for SUCCESS TAG
	            int success = json.getInt(TAG_SUCCESS);

	            if (success == 1)
	            {
	                // student found
	                // Getting Array of course
	            	student = json.getJSONArray(TAG_student);

	                // looping through All courses
	                for (int i = 0; i < student.length(); i++)//course JSONArray
	                {
	                    JSONObject c = student.getJSONObject(i); // read first

	                    // Storing each json item in variable
	                    String StudentID = c.getString(TAG_StudentID);
	                    String StudentNo = c.getString(TAG_StudentNo);
	                    String FullName = c.getString(TAG_FullName);
	                 //   String Avatar = c.getString(TAG_Avatar);
	                    // creating new HashMap
	                    HashMap<String, String> map = new HashMap<String, String>();

	                    // adding each child node to HashMap key => value
	                    map.put(TAG_StudentID, StudentID);
	                    map.put(TAG_StudentNo, StudentNo);
	                    map.put(TAG_FullName, FullName);
	                   
	                    // adding HashList to ArrayList
	                    studentList.add(map);
	                }
	            } else {
	            	x=false;
	  	
	            }
	            	
	        } catch (JSONException e) {
	        	e.printStackTrace();
	        }

	        return null;
		}   
    
		/**
         * After completing background task Dismiss the progress dialog
         * **/
		protected void onPostExecute(String file_url) { 
		      // dismiss the dialog after getting all products 
		      pDialog.dismiss(); 
		      if (x==false)
		    	Toast.makeText(getBaseContext(),"no student" ,Toast.LENGTH_LONG).show();
		       
		      ListAdapter adapter = new SimpleAdapter( 
		    		  ManageSection.this,  studentList, 
		                R.layout.list_student, new String[] { TAG_StudentID, 
		    				  TAG_StudentNo,TAG_FullName}, 
		                new int[] { R.id.StudentID, R.id.StudentNo,R.id.FullName}); 
		       setListAdapter(adapter); 

		     // Updating parsed JSON data into ListView 
		      
		} 

 
    }
}

it there is easy way please help me this problem derive me crazy