Android - ส่งข้อมูลจากโทรศัพท์มือถือ ไปยัง server เพื่อ insert ข้อมูลลง database ครับ ไม่ error แต่ insert ไม่ได้ครับ

package th.ac.kmutnb.reachtotemple;


import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import org.json.JSONException;
import org.json.JSONObject;


import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Dialog;
import android.app.DialogFragment;
import android.app.ProgressDialog;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.Toast;
import android.content.Context;
import android.graphics.Color;

public class Recommend extends Activity{
	
	private static Button start_date;
	private static Button end_date;	
	private EditText from;
	private EditText content;
	
	private final static int START_DATE = 999;
	private final static int END_DATE = 998;
	
	private static int start_year;
	private static int start_month;
	private static int start_day;
	private static int end_year;
	private static int end_month;
	private static int end_day;
	
	private static boolean start_flag = true;
	private static boolean end_flag = true;
	
	private ProgressDialog pd;
	

	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.recommend);
		
		start_date = (Button)findViewById(R.id.start_date);			
		end_date = (Button)findViewById(R.id.end_date);		
		from = (EditText)findViewById(R.id.rec_edit_from);
		content = (EditText)findViewById(R.id.rec_content);
	}	
	
	public void showDatePickerDialog_start(View v) {		
		DialogFragment newFragment = new DatePickerFragment(START_DATE);
	    newFragment.show(getFragmentManager(), "datePicker");
	}
	
	public void showDatePickerDialog_end(View v) {
	    DialogFragment newFragment = new DatePickerFragment(END_DATE);
	    newFragment.show(getFragmentManager(), "datePicker");
	}	
	
	public void rec_ok(View v){
		//check EditText FROM
		boolean check_from_user = true;
		String from_user = String.valueOf(from.getText());
		from_user = from_user.trim();
		
		for(int i = 0;i < from_user.length();i++){
			char ch;
			ch = from_user.charAt(i);
			if(ch == '\'' || ch == '\"'){
				Log.d("CHAR" , ""+ch);
				check_from_user = false;
				break;
			}
		}
		
		//check EditText CONTENT
		boolean check_content = true;
		String content_user = String.valueOf(content.getText());
		content_user = content_user.trim();
		
		for(int i = 0;i < content_user.length();i++){
			char ch;
			ch = content_user.charAt(i);
			if(ch == '\'' || ch == '\"'){
				Log.d("CHAR" , ""+ch);
				check_content = false;
				break;
			}
		}		
		
		String str = "^_^";
		
		if(start_flag && end_flag && check_from_user && !from_user.equals("") && check_content && !content_user.equals("")){			
			
			if(isConnectInternet()){  	
				
				String Strstart_date = null;
				String Strend_date = null;
				
				if(start_year != 0){
					Strstart_date = start_year + "-" + start_month + "-" + start_day;
					Strend_date = end_year + "-" + end_month + "-" + end_day;
				}
				
		        //Send to Server
		        HttpPostTask postTask = new HttpPostTask(mPostCallback_post);
		  		HttpPostTask.Parameter param = new HttpPostTask.Parameter();
		  		HashMap<String, String> postMap = new HashMap<String, String>();
		  		param.post = postMap;
		  		param.url = "http://" + "192.168.1.3" + "/activity/" + "postactivity.php";
	
		  		//Send parameter to server
		  		postMap.put("Strfrom", from_user);
		  		postMap.put("Strcontent", content_user);
		  		postMap.put("Strstart_date", Strstart_date);
		  		postMap.put("Strend_date", Strend_date);
	
		  		postTask.execute(param);
		  		
	    	}else{	        	
	    		Toast.makeText(getApplicationContext(),"please connect internet", Toast.LENGTH_LONG).show();
			}				
			
		}else if(!check_from_user){
			str = "don't use (\"  \') character in user name";
			Toast.makeText(getApplicationContext(), str, Toast.LENGTH_SHORT).show();
			
		}else if(from_user.equals("")){
			str = "please insert user name";
			Toast.makeText(getApplicationContext(), str, Toast.LENGTH_SHORT).show();
			
		}else if(start_flag == false || end_flag == false){
			str = "please choose final activity date";
			Toast.makeText(getApplicationContext(), str, Toast.LENGTH_SHORT).show();
			
		}else if(content_user.equals("")){
			str = "please insert content";
			Toast.makeText(getApplicationContext(), str, Toast.LENGTH_SHORT).show();
			
		}else if(!check_content){
			str = "don't use (\"  \') character in content";
			Toast.makeText(getApplicationContext(), str, Toast.LENGTH_SHORT).show();
		}		
		
		
		
		
		
	}	
	
	private void showProgressDialog(){
		pd = new ProgressDialog(this);
		pd.setIcon(R.drawable.ic_launcher);
		pd.setTitle("กำลังทำงาน");
		pd.setMessage("Downloading โปรดรอ...");
		pd.setCancelable(true);
		pd.show();
	}
	
	//implements TaskCallBack interface
	private HttpPostTask.TaskCallBack mPostCallback_post = new HttpPostTask.TaskCallBack() {

			@Override
			public void onPreExecute() {
				showProgressDialog();
			}

			@Override
			public void onProgressUpdate(HttpPostTask.Response... values) {
				HttpPostTask.Response res = values[0];
				
				if (res.status != 200) {
					return;
				}
				
				try {
					JSONObject response = new JSONObject(res.data);
						if (!response.getString("status").equals("success")) {
							Log.d("onProgressUpdate","Fail");
							return;
						}
					
					//JSONArray response = new JSONArray(res.data);
					
					Log.d("onProgressUpdate",response.toString());//JSON
				} catch (JSONException e) {
					Log.d("onProgressUpdate", e.toString() + "");
				}
			}

			@Override
			public void onPostExecute(ArrayList<HttpPostTask.Response> result) {
				pd.dismiss();				
				
				/*Log.d("onPostExecute_size" , String.valueOf(result.size()));		
				
				for(Response r : result){
					Log.d("onPostExecute_Response_data" , r.data);//String
					Log.d("onPostExecute_Response",r.toString());//Response			
				}	*/	
				
				result.clear();
			}

			@Override
			public void onIOException() {
				Log.d("onIOException","Fail");
			}
	};		
	
	//show dialog for choose date
	
	@SuppressLint("ValidFragment")	
    public static class DatePickerFragment extends DialogFragment{		
		private int key;
		
		public DatePickerFragment(){}
		
		public DatePickerFragment(int k){
			key = k;
		}
		
		@Override
		public Dialog onCreateDialog(Bundle savedInstanceState) {
		
			//callback when set date 
			RTTDatePickerDialog.OnDateSetListener d = new RTTDatePickerDialog.OnDateSetListener(){				
				@Override
				public void onDateSet(DatePicker view, int year,int monthOfYear, int dayOfMonth) {
					if(key == START_DATE){					
						
						start_date.setText(dayOfMonth+"/"+ (monthOfYear+1) +"/"+year);	
						
						end_date.setText("final date");
						end_date.setTextColor(Color.BLACK);
						end_date.setBackgroundDrawable(start_date.getBackground());
						end_date.setClickable(true);
						
						//start_flag = true;
						
						start_year = year;
						start_month = monthOfYear+1;
						start_day = dayOfMonth;
						end_year = 0;
						end_month = 0;
						end_day = 0;
						end_flag = false;
					}else if(key == END_DATE){
						
						end_date.setText(dayOfMonth+"/"+ (monthOfYear+1) +"/"+year);	
						
						end_flag = true;
						
						end_year = year;
						end_month = monthOfYear+1;
						end_day = dayOfMonth;
					}
				}		
			
			};
			
			// Use the current date as the default date in the picker	
			if(key == START_DATE){	
				
				int year,month,day;
										
					final Calendar c = Calendar.getInstance();
					year = c.get(Calendar.YEAR);
					month = c.get(Calendar.MONTH);
					day = c.get(Calendar.DAY_OF_MONTH);	
					
				
				return new RTTDatePickerDialog(getActivity(), d, year, month, day);
			}else if(key == END_DATE){
				return new RTTDatePickerDialog(getActivity(), d, start_year, start_month-1, start_day);	
			}
			
			return null;
		}			
	}	
	
	private boolean isConnectInternet(){
        ConnectivityManager connect = (ConnectivityManager) 
        		getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
        if (connect != null){
            NetworkInfo[] info = connect.getAllNetworkInfo();
            if (info != null) {
                for (int i = 0; i < info.length; i++) {                	
                    if(info[i].getState() == NetworkInfo.State.CONNECTED){
                        return true;
                    }
                }
            }
        }
          return false;
    }
}

<?php
	require("connect.php");
	
	$Strfrom = mysql_escape_string($_POST['Strfrom']);
	$Strcontent = mysql_escape_string($_POST['Strcontent']);
	$Strstart_date = mysql_escape_string($_POST['Strstart_date']);
	$Strend_date = mysql_escape_string($_POST['Strend_date']);
	
	$date = date("Y-m-d H:i:s" , strtotime('now'));
	
	$mes = "INSERT INTO activity(activity_id , when , content , start_date, end_date , from_user , status) VALUES(1, '$date' , '$Strcontent', '$Strstart_date', '$Strend_date', '$Strfrom', 1);";
		
	$query = mysql_query($mes);
	
	$returnArray=array("status"=>"success","mes"=>$mes,"result"=>$query);
	
	echo json_encode($returnArray);
	
	mysql_close($con);
?>