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POForce close when press back while fetching data from internet
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  1. POForce close when press back while fetching data from internet
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    copied!<p>Whenever user press back button While fetching xml data from web using AsyncTask my app goes to force close state. How can i solve this. Thanks in advance. </p> <pre><code>public class InboxActivity extends Activity { public static ExpandableListView mailList; List&lt;HashMap&lt;String,String&gt;&gt; list; MailList asyncTaskMailList; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.inbox_layout); ConstantValues.footerCurrentActivity=InboxActivity.this; mailList=(ExpandableListView)findViewById(R.id.expandableListView1); HomePageActivity.homePageTabHost.getTabWidget().getChildTabViewAt(ConstantValues.CURRENT_POSITION) .setBackgroundDrawable(getResources().getDrawable(R.drawable.tab_widget_normal)); asyncTaskMailList=new MailList(); asyncTaskMailList.execute(); } private OnChildClickListener childClickListener=new ExpandableListView.OnChildClickListener() { public boolean onChildClick(ExpandableListView parent, View v,int groupPosition, int childPosition, long id) { ConstantValues.STATION_NAME=ConstantValues.inboxStations.get(groupPosition); ConstantValues.CURRENT_POSITION=1; startActivity(new Intent(InboxActivity.this, HomePageActivity.class)); return false; } }; @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(keyCode == KeyEvent.KEYCODE_BACK){ this.getParent().onBackPressed(); asyncTaskMailList.cancel(true); return true; } return super.onKeyDown(keyCode, event); } @Override protected void onStop() { super.onStop(); asyncTaskMailList.cancel(true); } @Override protected void onDestroy() { asyncTaskMailList.cancel(true); super.onDestroy(); } class MailList extends AsyncTask&lt;String, String, String&gt; { @Override protected void onPreExecute() { super.onPreExecute(); NetworkExceptionPopUp.showProgressBar(); } @Override protected String doInBackground(String... params) { list=new ArrayList&lt;HashMap&lt;String,String&gt;&gt;(); WebServerCall.getInboxMail(InboxActivity.this); return null; } @Override protected void onPostExecute(String result) { super.onPostExecute(result); mailList.setAdapter(new InboxAdapter(InboxActivity.this)); NetworkExceptionPopUp.dismissProgressBar(); mailList.setOnGroupClickListener(null); mailList.setOnChildClickListener(childClickListener); mailList.setClickable(true); } } </code></pre> <p>} Above code is my updated code. This also sometime shows exception. Here, I had used onStop() and OnDestroy() to cancel AsyncTask while other activity comes top.</p>
 

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