Hi Alok,
if your both activities are from part of a single application
then why don't you simply create a common non-activity class with members as
static and access them from wherever you want.
On Sun, Jan 3, 2010 at 12:17 AM, Coco <[email protected]> wrote:
> His code as given would crash if initialized to null on activity
> change. I think what you mean is to reinitialize the containers which
> is what I would suggest trying. Something like this:
>
> public class MyActivity extends Activity {
> public static HashMap<String, String> hMap;
>
> /** Called when the activity is first created. */
> @Override
> public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> setContentView(R.layout.main);
> hMap = new HashMap<String, String>(); // Recreate container
> each time.
> ...
> }
>
> Alternatively he can just call hMap.clear() in onCreate() which will
> have much of the same effect. Which approach is better depends on
> exactly what he's trying to do.
>
> Another thing to consider is whether these members really want to be
> static in the first place.
>
> -Melinda
>
> On Jan 2, 8:50 am, Yousuf Faheem <[email protected]> wrote:
> > Hi,
> >
> > Try initiallizing them to null before the change of activity takes place
> or
> > at the start of home activity. Since your application is not closed(scope
> of
> > the static objects), the static objects are there in memory allocated to
> > that process and hence retain the value that you give.
> >
> > Thanks & Regards,
> > Yousuf Syed
> >
> > On Sat, Jan 2, 2010 at 2:27 AM, Alok Kulkarni <[email protected]>
> wrote:
> > > Hi guys, I am facing a problem in my application.
> > > I have a few static arrays and Hashmaps in my app which i fill in when
> my
> > > Activity starts.Then this activity later launches another Activity.
> Now
> > > user presses Home button of Back button and again restarts the app,
> even
> > > then the static objects remain in memory. I beleive this is default
> android
> > > behaviour.
> > > I have an example app.
> > > package com.cm.test;
> >
> > > import java.util.HashMap;
> >
> > > import android.app.Activity;
> > > import android.os.Bundle;
> > > import android.util.Log;
> >
> > > public class MyActivity extends Activity {
> > > public static HashMap<String, String> hMap = new HashMap<String,
> > > String>();
> >
> > > /** Called when the activity is first created. */
> > > @Override
> > > public void onCreate(Bundle savedInstanceState) {
> > > super.onCreate(savedInstanceState);
> > > setContentView(R.layout.main);
> > > Log.i("***","Hash map size = "+hMap.size());
> >
> > > hMap.put("Alok","Alokkkk");
> > > hMap.put("Jitu","Jituuuu");
> >
> > > Log.i("***","Activity onCreate() called");
> > > }
> > > @Override
> > > public void onDestroy()
> > > {
> > > Log.i("***","Activity onDestroy() called");
> > > super.onDestroy();
> >
> > > }
> >
> > > @Override
> > > public void onResume()
> > > {
> > > super.onResume();
> > > Log.i("***","Activity onResume() called");
> > > }
> > > @Override
> > > public void onStop()
> > > {
> >
> > > super.onStop();
> >
> > > Log.i("***","Activity onStop() called");
> > > }
> >
> > > }
> > > Output First time is Size = 0. for 1st launch, Next for every launch ,
> > > HashMap size is 2... If i use ArrayList , the size of ArrayList goes on
> > > increasing.
> > > I dont want this to happen.One thing was that to clear the HashMap in
> > > onDestroy() or in onStop() in case user presses Home button. But my
> Activity
> > > launches another ListActivity in it. So the alternae option is to clear
> the
> > > Hashmaps in onDestroy() | onStop() of this activity.
> > > I am not much clear when the Activity exits. From the posts that i have
> > > read i found few things here
> > >http://groups.google.com/group/android-developers/browse_thread/threa.
> ..
> > > The manifest part android:clearTaskOnLaunch=true does not work in my
> case.
> > > What do you people suggest in this case?
> > > Thanks,
> > > Alok.
> >
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