android progress dialog and threads

[A-S]

I'm trying to show a progress dialog while adding a row to a database table, but the problem is that the progress dialog is only showing for 1 second and the application crashes after that, can anyone help me please ?\[code\]public void onClick(View arg0) { // TODO Auto-generated method stub ConnectivityManager cm =(ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo netInfo = cm.getActiveNetworkInfo(); if (netInfo != null && netInfo.isConnectedOrConnecting()) { final EditText wholepost=(EditText)findViewById(R.id.wholepost); final String post_type=spinner.getSelectedItem().toString(); final String post_type2=post_type.replace(" ", "%20"); final String post1=wholepost.getText().toString(); String post2=post1.replace(" ", "%20"); final String post3=post2.replace("\n","%0D"); DateFormat df = new SimpleDateFormat("yyyy-MM-dd"); final String now = df.format(new Date()); if(post1.equals(null)) { Toast.makeText(getBaseContext(), "Please write a post before clicking on the button",Toast.LENGTH_LONG).show(); } else { if(post1.length()<15) { Toast.makeText(getBaseContext(), "Post is too small",Toast.LENGTH_LONG).show(); } else { if(post1.length()>500) {Toast.makeText(getBaseContext(), "Post should be smaller",Toast.LENGTH_LONG).show();} else { pd.show(); Thread th=new Thread(new Runnable() { public void run() { StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); StrictMode.setThreadPolicy(policy); httpclient = new DefaultHttpClient(); httppost = new HttpPost("http://192.168.1.38/test/Addpost.php?username="+username+"&fname="+firstname+"&lname="+lastname+"&dop="+now+"&content="+post3+"&type="+post_type2+""); try { nameValuePairs = new ArrayList<NameValuePair>(); nameValuePairs.add(new BasicNameValuePair("FirstN",firstname)); nameValuePairs.add(new BasicNameValuePair("LastN",lastname)); nameValuePairs.add(new BasicNameValuePair("Content",post1)); nameValuePairs.add(new BasicNameValuePair("type",post_type)); nameValuePairs.add(new BasicNameValuePair("Dateofp",now)); nameValuePairs.add(new BasicNameValuePair("username",username)); httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); response = httpclient.execute(httppost); if(response.getStatusLine().getStatusCode()==200) { entity=response.getEntity(); if(entity !=null) { Toast.makeText(getBaseContext(),"POST SUCCESFULLY ADDED",Toast.LENGTH_LONG).show(); } } else { Toast.makeText(getBaseContext(),"ERROR RERTY OR CHECK YOUR CONNECTION",Toast.LENGTH_LONG).show(); } wholepost.setText(""); } catch(Exception ex) {Toast.makeText(getBaseContext(),"CONNECTION ERROR",Toast.LENGTH_LONG).show();} pd.dismiss(); } }); th.start(); }} } } else { Toast.makeText(getBaseContext(),"Please make sure you're connected to the internet",Toast.LENGTH_LONG).show(); } }});\[/code\]