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POAsyncTaskbackbutton
 

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    <p>am able to sucessfully get data from the server.if data is success then am navigating NextScreen.1. if backbutton pressed when getting data then AsyncTask Dialog disappear, but after sometime it navigates to Nextscreen activity. so if i press backbuttob asyn task has to cancel and it should not navigate to next activity. </p> <pre><code> public class Screenone extends Activity { EditText user,pass; Button login; InputStream is; String productResponse; EditText edit; int responseCode; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.mainlog); user = (EditText) findViewById(R.id.user); pass = (EditText) findViewById(R.id.password); login = (Button) findViewById(R.id.login); } login.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub if ((user.getText().length() &gt; 0) &amp;&amp; (pass.getText().length() &gt; 0) ) { new Load().execute(Status); } } }); } private class Load extends AsyncTask&lt;String, String, String&gt; { private ProgressDialog Dialog = new ProgressDialog(LoginScreen.this); protected void onPreExecute() { // TODO Auto-generated method stub super.onPreExecute(); Dialog.setMessage("Please wait..."); Dialog.show(); } protected String doInBackground(String... status) { try { HttpClient httpclient = new DefaultHttpClient(); HttpPost post = new HttpPost("---url---"); responseCode =httpResponse.getStatusLine().getStatusCode(); } catch (Exception e) { } return null; } protected void onPostExecute(String Result) { // TODO Auto-generated method stub super.onPostExecute(Result); if (responseCode==200) { Dialog.dismiss(); Intent intent =new Intent(Screenone.this, NextScreen.class); startActivity(intent); } } } public void onBackPressed() { // TODO Auto-generated method stub super.onBackPressed(); moveTaskToBack(true); } } </code></pre>
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    1. COI think you have to finish() the started activity so that i will not retain the values...
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    2. COcall http://developer.android.com/reference/android/os/AsyncTask.html#cancel(boolean) onback and your asynctask will not call onPostExecute()
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