[android-developers] Back button problem

[pramod.deore]

Hi everybody,

In my application I am displaying list. I have created
ContextMenu. In that there are options like add,remove,back,etc...
Now when I select Remove option then  I call method
deleteRecord(), which  delete that list record from database. After
that I call method - startActivity(getIntent());  Because of this
method activity restarts and list changes are instantly visible to
user because in start method I had write code that display the list
like.

public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);

try
{
sampleDB =  this.openOrCreateDatabase(SAMPLE_DBNAME,
MODE_PRIVATE, null);

Cursor c = sampleDB.rawQuery ("SELECT RoomName,
SwitchFullName FROM SwitchTable ORDER BY RoomName",null);

int count = c.getCount();
System.out.println ("Total number of records are"+count);
if (c != null )
{
if  (c.moveToFirst())
{
do
{
roomName = 
c.getString(c.getColumnIndex("RoomName"));
switchName =
c.getString(c.getColumnIndex("SwitchFullName"));

System.out.println 
(roomName+":"+switchName);
results.add(roomName+"-"+switchName);

}
while (c.moveToNext());
c.close();
}
}

this.setListAdapter(new ArrayAdapter(this,
android.R.layout.simple_list_item_1,results));



}
catch (SQLiteException se )
{
Log.e(getClass().getSimpleName(), "Could not create or Open
the database");
}
finally
{
//sampleDB.close();
}

registerForContextMenu(getListView());
}


Now suppose I have list like this

Hall - Fan
Kitchen - AC
Bedroom - tv

and suppose I delete record no 1 then list display as following

Kitchen - AC
Bedroom - tv

It looks perfectly well. But suppose I press the back button then
list is again display as

Hall - Fan
Kitchen - AC
Bedroom - tv

Actually first record is deleted succesfully, but though also it is
displayed when I press back button. How to avoid this problem?

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[android-developers] back button problem

[ragupathi ragupathi]

hi every one,

im new one for in android. im developing one application. im using
database if i calling new activity to store the values in database it
working fine. but when i came back to previous activity it not
reloaded that previous activity. it will display same as old content.
i need when im clicking back button it reloaded (refresh) all content
in the activity.. can any one help me pls..



advance thaks...

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Re: [android-developers] Back button problem

[YuviDroid]

Can't you just refresh the listview instead of creating a new Activity?
If you instead really want to create a new one, before calling
startActivity() call finish(), so that pressing back will skip that "old"
list activity.

On Wed, Dec 8, 2010 at 12:08 PM, pramod.deore wrote:

> Hi everybody,
>
>In my application I am displaying list. I have created
> ContextMenu. In that there are options like add,remove,back,etc...
>Now when I select Remove option then  I call method
> deleteRecord(), which  delete that list record from database. After
> that I call method - startActivity(getIntent());  Because of this
> method activity restarts and list changes are instantly visible to
> user because in start method I had write code that display the list
> like.
>
> public void onCreate(Bundle savedInstanceState)
>{
>super.onCreate(savedInstanceState);
>
>try
>{
>sampleDB =  this.openOrCreateDatabase(SAMPLE_DBNAME,
> MODE_PRIVATE, null);
>
>Cursor c = sampleDB.rawQuery ("SELECT RoomName,
> SwitchFullName FROM SwitchTable ORDER BY RoomName",null);
>
>int count = c.getCount();
>System.out.println ("Total number of records are"+count);
>if (c != null )
>{
>if  (c.moveToFirst())
>{
>do
>{
>roomName =
> c.getString(c.getColumnIndex("RoomName"));
>switchName =
> c.getString(c.getColumnIndex("SwitchFullName"));
>
>System.out.println
> (roomName+":"+switchName);
>
>  results.add(roomName+"-"+switchName);
>
>}
>while (c.moveToNext());
>c.close();
>}
>}
>
>this.setListAdapter(new ArrayAdapter(this,
> android.R.layout.simple_list_item_1,results));
>
>
>
>}
>catch (SQLiteException se )
>{
>Log.e(getClass().getSimpleName(), "Could not create or Open
> the database");
>}
>finally
>{
>//sampleDB.close();
>}
>
>registerForContextMenu(getListView());
>}
>
>
> Now suppose I have list like this
>
> Hall - Fan
> Kitchen - AC
> Bedroom - tv
>
> and suppose I delete record no 1 then list display as following
>
> Kitchen - AC
> Bedroom - tv
>
> It looks perfectly well. But suppose I press the back button then
> list is again display as
>
> Hall - Fan
> Kitchen - AC
> Bedroom - tv
>
> Actually first record is deleted succesfully, but though also it is
> displayed when I press back button. How to avoid this problem?
>
> --
> You received this message because you are subscribed to the Google
> Groups "Android Developers" group.
> To post to this group, send email to android-developers@googlegroups.com
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> android-developers+unsubscr...@googlegroups.com
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> http://groups.google.com/group/android-developers?hl=en




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quickly access your favorite apps and contacts!)
http://android.yuvalsharon.net

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Re: [android-developers] Back button problem

[Kostya Vasilyev]

Pramod,

Move the code that loads data from the database from onCreate to onStart.

See this for an explanation:

http://developer.android.com/guide/topics/fundamentals.html#actlife

( scroll down to see a very useful flowchart )

-- Kostya

08.12.2010 14:08, pramod.deore пишет:

Hi everybody,

 In my application I am displaying list. I have created
ContextMenu. In that there are options like add,remove,back,etc...
 Now when I select Remove option then  I call method
deleteRecord(), which  delete that list record from database. After
that I call method - startActivity(getIntent());  Because of this
method activity restarts and list changes are instantly visible to
user because in start method I had write code that display the list
like.

public void onCreate(Bundle savedInstanceState)
 {
 super.onCreate(savedInstanceState);

 try
 {
sampleDB =  this.openOrCreateDatabase(SAMPLE_DBNAME,
MODE_PRIVATE, null);

Cursor c = sampleDB.rawQuery ("SELECT RoomName,
SwitchFullName FROM SwitchTable ORDER BY RoomName",null);

int count = c.getCount();
System.out.println ("Total number of records are"+count);
if (c != null )
{
if  (c.moveToFirst())
{
do
{
roomName = 
c.getString(c.getColumnIndex("RoomName"));
switchName =
c.getString(c.getColumnIndex("SwitchFullName"));

System.out.println 
(roomName+":"+switchName);
results.add(roomName+"-"+switchName);

}
while (c.moveToNext());
c.close();
}
}

this.setListAdapter(new ArrayAdapter(this,
android.R.layout.simple_list_item_1,results));



 }
 catch (SQLiteException se )
 {
Log.e(getClass().getSimpleName(), "Could not create or Open
the database");
 }
 finally
 {
//sampleDB.close();
 }

 registerForContextMenu(getListView());
 }


Now suppose I have list like this

Hall - Fan
Kitchen - AC
Bedroom - tv

and suppose I delete record no 1 then list display as following

Kitchen - AC
Bedroom - tv

It looks perfectly well. But suppose I press the back button then
list is again display as

Hall - Fan
Kitchen - AC
Bedroom - tv

Actually first record is deleted succesfully, but though also it is
displayed when I press back button. How to avoid this problem?




--
Kostya Vasilyev -- WiFi Manager + pretty widget -- http://kmansoft.wordpress.com

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Re: [android-developers] back button problem

[TreKing]

On Fri, Jul 1, 2011 at 12:11 AM, ragupathi ragupathi wrote:

> im new one for in android. im developing one application. im using
> database if i calling new activity to store the values in database it
> working fine. but when i came back to previous activity it not
> reloaded that previous activity. it will display same as old content.
> i need when im clicking back button it reloaded (refresh) all content
> in the activity.. can any one help me pls..
>

Look at startActivityForResult().

-
TreKing  - Chicago
transit tracking app for Android-powered devices

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Re: [android-developers] back button problem

[Mark Murphy]

I'd just reload the data in onResume(). If you are using managed
cursors or the Loader framework, that sort of thing should happen
automagically.

On Fri, Jul 1, 2011 at 2:43 AM, TreKing  wrote:
> On Fri, Jul 1, 2011 at 12:11 AM, ragupathi ragupathi 
> wrote:
>>
>> im new one for in android. im developing one application. im using
>> database if i calling new activity to store the values in database it
>> working fine. but when i came back to previous activity it not
>> reloaded that previous activity. it will display same as old content.
>> i need when im clicking back button it reloaded (refresh) all content
>> in the activity.. can any one help me pls..
>
> Look at startActivityForResult().
>
> -
> TreKing - Chicago transit tracking app for Android-powered devices
>
> --
> You received this message because you are subscribed to the Google
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[android-developers] Back button problem in android

[pramod shirsath]

when i click on androids  back button it stops whole activitybut i
want to come back to previous page..can anyone help me to
solve this problem...

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