I do the management in onStop, for my cursor which supplies the data
needed by a ListView (which means the cursor has to be open whenever
the activity is displayed).
@Override
protected void onStop() {
super.onStop();
if(db!=null){
if(db.isOpen()){
db.close();
}
}
if(mCursor!=null){
if(!mCursor.isClosed()){
mCursor.close();
}
}
}
On Jan 6, 7:25 am, JasonMP <hyperje...@gmail.com> wrote:
> That was it! I took out the startManagingCursor() and it worked
> fine. My next question is what should I do to handle the life cycle
> of my cursor? Should I close it outside the switch statement?
>
> On Jan 5, 5:41 pm, Vladimir <vladimir.funti...@gmail.com> wrote:
>
> > What do you think about this:
> > 1. Cursor created in onContextItemSelected() is null (for some reason)
> > 2. Since its lifecycle is managed by the activity (startManagingCursor
> > (c)), it tries to release it when the activity is stopped (when the
> > new intent is launched)
> > 3. It doesn't expect managed cursor to be null and crashes (at
> > android.app.Activity.performStop(Activity.java:3604))
> > Does that make sense? I have little idea about how this cursor
> > management works, but I would do the following:
> > 1. Try removing startManagingCursor() calls to see if these are
> > related
> > 2. Double check if the cursor is null
> > 3. Take a look inside Android source and specifically Activity.java:
> > 3604
> > Just a guess :)
>
> > On Jan 5, 4:02 pm, JasonMP <hyperje...@gmail.com> wrote:
>
> > > Ok, I tried gino's idea with initializing my arrays differently. I
> > > also changed there names so that they did not share a name with any
> > > other arrays in my app: Did not work.
>
> > > I also tried calling to static variables instead of passing variables
> > > between classes with intents: This also did not work.
>
> > > I can't determine which line of code causes the error. The logcat
> > > does not give me a pointer to anything in my app at all. I tried to
> > > narrow it down with breakpoints and logging and what I found is that
> > > it runs through all of my code without a hitch, and then once its done
> > > it throws the exception.
>
> > > And again the exception only happens when I call the intent from a
> > > contextMenu.
>
> > > On Jan 1, 2:56 am, Wiebbe <wie...@gmail.com> wrote:
>
> > > > Shouldnt you check if the bundle is null or not? Try to loop through
> > > > it when you get there from a onContextItemSelected event. I'm guessing
> > > > some value somewhere is null when it should be instantiated. Perhaps
> > > > the intent is started quicker or without the bundle somehow so you get
> > > > a nullpointer exception?
>
> > > > On 31 dec 2009, 15:57, JasonMP <hyperje...@gmail.com> wrote:
>
> > > > > yes, Select.class is another one of my files. throughout my app there
> > > > > are a few different calls to it, all done the same way i.e. "Intent i
> > > > > = new Intent(this, Select.class); startActivity(i);"
>
> > > > > No where in Select.class do I make a call to start Select.class or
> > > > > Sheet.class. When its done it calls finish();
>
> > > > > in the onCreate() of Select.class I grab the extras from the invoking
> > > > > class with this line of code:
>
> > > > > public class Select extends ListActivity{
>
> > > > > DBAdapter db = new DBAdapter(this);
> > > > > String slotName = null;
>
> > > > > @Override
> > > > > public void onCreate(Bundle savedInstanceState) {
> > > > > super.onCreate(savedInstanceState);
>
> > > > > db.open();
>
> > > > > ListView list = getListView();
>
> > > > > View v = View.inflate(this, R.layout.list_header,
> > > > > null);
> > > > > list.addHeaderView(v, null, false);
>
> > > > > name =
> > > > > this.getIntent().getStringExtra(DBAdapter.KEY_NAME);
> > > > > }
>
> > > > > Could it be something in the .getIntent() method? or
> > > > > the .getStringExtra()?
>
> > > > > On Dec 30, 7:19 pm, "Stephen @ gmail.com" <sdickey2...@gmail.com>
> > > > > wrote:
>
> > > > > > Now that I understand your intent creation a little better, and I
> > > > > > see that
> > > > > > the intent you are creating is unique from the class in which the
> > > > > > code
> > > > > > exists, I am not quite sure how it could be an infinite loop in the
> > > > > > (immediate) way I was thinking.
>
> > > > > > Reading this code
>
> > > > > > Intent i = new Intent(this, Select.class);
>
> > > > > > I have to start thinking there's something wrong with this. I
> > > > > > tried to look
> > > > > > up the "Select" class on the android developers site, and couldn't
> > > > > > find it.
> > > > > > Is that a class from another of your files? I guess I would wonder
> > > > > > if the
> > > > > > code being invoked there, is somehow causing this class to be
> > > > > > invoked, thus
> > > > > > causing some kind of loop. I would grep for any reference to your
> > > > > > Sheet
> > > > > > class, from anywhere else in your code, and that would likely be
> > > > > > suspect.
>
> > > > > > In general, the below is kind of a side topic, to maybe help you
> > > > > > with
> > > > > > generic debugging.
>
> > > > > > All the Best, Steve.
>
> > > > > > *Ok... the only thing I can think to really help you is to start
> > > > > > taking
> > > > > > advantage of logging. In your import list, I see you don't include
> > > > > > the
> > > > > > logger code, so maybe you can give this a shot.
>
> > > > > > 1) in the import list
>
> > > > > > import android.util.Log;
>
> > > > > > 2) and throughout your code
>
> > > > > > Log.d( TAG, DebugText );
>
> > > > > > where TAG is a string that is unique to you, and "DebugText" is
> > > > > > something
> > > > > > useful to identify the part of the program you're interested in.
>
> > > > > > *
>
> > > > > > On Wed, Dec 30, 2009 at 11:32 AM, JasonMP <hyperje...@gmail.com>
> > > > > > wrote:
> > > > > > > Ok, I'm suddenly very curious by your previous statement stephen
> > > > > > > about
> > > > > > > the possibility of creating an infinite loop. Upon a little more
> > > > > > > investigation I'm now getting errors all over the place...same
> > > > > > > error....just at different points in the app where I try to
> > > > > > > startActivity(intent); As soon as the new activity receives
> > > > > > > focus is
> > > > > > > crashes.
>
> > > > > > > On Dec 30, 1:58 pm, JasonMP <hyperje...@gmail.com> wrote:
> > > > > > > > package com.mallet.dtool;
>
> > > > > > > > import android.app.AlertDialog;
> > > > > > > > import android.app.TabActivity;
> > > > > > > > import android.app.AlertDialog.Builder;
> > > > > > > > import android.content.DialogInterface;
> > > > > > > > import android.content.Intent;
> > > > > > > > import android.content.DialogInterface.OnClickListener;
> > > > > > > > import android.content.res.Configuration;
> > > > > > > > import android.database.Cursor;
> > > > > > > > import android.graphics.Color;
> > > > > > > > import android.os.Bundle;
> > > > > > > > import android.view.ContextMenu;
> > > > > > > > import android.view.KeyEvent;
> > > > > > > > import android.view.Menu;
> > > > > > > > import android.view.MenuItem;
> > > > > > > > import android.view.View;
> > > > > > > > import android.view.ContextMenu.ContextMenuInfo;
> > > > > > > > import android.widget.AdapterView;
> > > > > > > > import android.widget.ImageView;
> > > > > > > > import android.widget.LinearLayout;
> > > > > > > > import android.widget.ListView;
> > > > > > > > import android.widget.SimpleCursorAdapter;
> > > > > > > > import android.widget.TabHost;
> > > > > > > > import android.widget.TableLayout;
> > > > > > > > import android.widget.TextView;
> > > > > > > > import android.widget.Toast;
> > > > > > > > import android.widget.AdapterView.AdapterContextMenuInfo;
> > > > > > > > import android.widget.AdapterView.OnItemClickListener;
> > > > > > > > import android.widget.TabHost.OnTabChangeListener;
>
> > > > > > > > public class Sheet extends TabActivity{
>
> > > > > > > > @Override public void
> > > > > > > > onConfigurationChanged(Configuration
> > > > > > > newConfig)
> > > > > > > > { super.onConfigurationChanged(newConfig); }
> > > > > > > > DBAdapter db = new DBAdapter(this);
> > > > > > > > static Long cRowId;
>
> > > > > > > > //Variable declaration
>
> > > > > > > > public static Integer tabState = 1;
>
> > > > > > > > @Override
> > > > > > > > public void onCreate(Bundle savedInstanceState) {
> > > > > > > > super.onCreate(savedInstanceState);
> > > > > > > > setContentView(R.layout.sheet);
>
> > > > > > > > db.open();
>
> > > > > > > > //capture Tab4 elements
> > > > > > > > aList = (ListView) findViewById(R.id.alist);
> > > > > > > > aList.setOnItemClickListener(new OnItemClickListener(){
>
> > > > > > > > @Override
> > > > > > > > public void onItemClick(AdapterView<?>
> > > > > > > > arg0, View
> > > > > > > arg1, int arg2,
> > > > > > > > long arg3) {
>
> > > > > > > > Cursor c =
> > > > > > > > db.getAll(Sheet.charName);
>
> > > > > > > > c.moveToPosition(arg2 - 1);
>
> > > > > > > > Builder builder2 = new
> > > > > > > AlertDialog.Builder(Sheet.this);
> > > > > > > >
> > > > > > > > builder2.setTitle(c.getString(c.getColumnIndexOrThrow
> > > > > > > > (DBAdapter.KEY_NAME)));
> > > > > > > > builder2.setIcon(R.drawable.equipment);
>
> > > > > > > builder2.setMessage(c.getString(c.getColumnIndexOrThrow
> > > > > > > > (DBAdapter.KEY_DESC)));
> > > > > > > > builder2.setPositiveButton("Ok", null);
> > > > > > > > builder2.show();
>
> > > > > > > > }
>
> > > > > > > > });
> > > > > > > > registerForContextMenu(aList);
>
> > > > > > > > }
> > > > > > > > @Override
> > > > > > > > public void onResume()
> > > > > > > > {
> > > > > > > > super.onResume();
>
> > > > > > > > fillAList();
> > > > > > > > }
> > > > > > > > @Override
> > > > > > > > public void onDestroy(){
> > > > > > > > super.onDestroy();
> > > > > > > > db.close();
> > > > > > > > }
>
> > > > > > > > @Override
> > > > > > > > public void onCreateContextMenu(ContextMenu menu, View
> > > > > > > > v,
>
> ...
>
> read more »
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