Database Users

event handling in dynamically created control

Hi all,
I am using eVC++ 4.0, and i've dynamically created a CListView like this:
Code:
lv.Create(0,_T(""),WS_CHILD|WS_VISIBLE,r,this,5);
but I dont know how to handle the events of this control... any ideas??
Mohammad

To get events from a listview (win32) I normally subclass it. I use the subclassing routine to post a message back to the parent when the user is doing something like tapping on it, then the windows routine can check whats selected etc and act on it. Is subclassing possible in mfc ?( I don't use it).

Thank u
but can anybody post some code??
thnx

Ok, I am a bit lazy to look up code at the moment, but here's something:
Yes, subclassing is possible in MFC. You just derive your class from the basic class provided like this:
Code:
class MyListView : pubic CListView
Then you add message handlers in the normal matter.
EDIT: The following passage is incorrect:
But I think subclassing may not be necessary in you case. List box controls send WM_COMMAND messages with notifications of major events like selection change to the parent window. All you have to do is to create a WM_COMMAND handler in your parent class.
Sorry I was thinking of ListBox not list view when I wrote it.
To manually add message handlers you need to put macros like ON_MESAGE or ON_COMMAND in the DECLARE_MESSAGE_MAP section of the class cpp file. All the detaisl are available on MSDN.

Are you saying that a listview will send the same WM_COMMAND as a list box in mfc? Dose this also happen in win32 made listviews. I have always thought it was a bit too tedious to find out when the user taps an item in the listview.
After reading your post levenum I had a quick look and it says that a WM_NOTIFY gets sent to the parent with a LVN_ITEMCHANGED for example. I had not used the LVN_**** because when I looked at them there was none that seem to deal with selections. I would guess that LVN_ITEMACTIVATE or LVN_ODSTATECHANGED would be usefull for this but then a second tap would not be picked up still leaving me wanting subclassing in many situations to get the users tap.

Ok, I have read what u wrote guys and my problem is almost solved, I used the OnNotify() method to handle messages sent from child controls like this:
Code:
BOOL CTest2Dlg::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
// TODO: Add your specialized code here and/or call the base class
if(wParam ==5 ) //5 is control ID
{
NMHDR *ph =(NMHDR*)lParam;
if(ph->code==NM_CLICK)
MessageBox("Click");
else if(ph->code==HDN_ITEMCLICK)
MessageBox("Item Click");
else
{
CString str;
str.Format("%d",ph->code);
MessageBox(str);
}
}
return CDialog::OnNotify(wParam, lParam, pResult);
}
Now there still a very small prolem: what messages should I handle for 'Selected Item Changed' event ?? I know its easy but I couldnt find it
Regards

mohgdeisat: I am sorry, I made a mistake about WM_COMMAND.
OdeeanRDeathshead is right, I was thinking of a list box not list view.
To make up for this, here is some sample code from a win32 dialog app that uses list view control. I hope it will be of some help:
Code:
//this is from the dialog window function:
case WM_NOTIFY: //handle events:
nmhdr = (LPNMHDR)lParam;
switch (nmhdr->idFrom)
{
case IDC_LEDLIST: //list control ID.
return OnLEDListEvent(hwndDlg, (LPNMLISTVIEW)lParam);
break;
}
break;
BOOL OnLEDListEvent(HWND hwndDlg, LPNMLISTVIEW nmlv)
{
/////
// Handles list view control notification messages
switch (nmlv->hdr.code)
{
case LVN_ITEMCHANGED:
return OnLEDListItemChanged(hwndDlg, nmlv);
break;
}
return 0;
}
BOOL OnLEDListItemChanged(HWND hwndDlg, LPNMLISTVIEW nmlv)
{
if (ListView_GetSelectionMark(nmlv->hdr.hwndFrom) != nmlv->iItem) return 0;
/* do what you need here */
return 0;
}
Don't mind the fact that I used 3 different functions. This is part of a bigger program and I am trying to keep things well organized without resorting to classes.
As I understand it, LVN_ITEMCHANGE is received for different reasons so I try to handle only the one coming from selected item. LVN_ITEMACTIVATE is only sent when you double click the item so if you just want to catch selection change you need to use LVN_ITEMCHANGE.
Once again, sorry for confusing you before.

thanx pals, good job!!!
I think my problem is now solved with ur help :wink:
Mohammad

Ok guys, I said that my problem was solved, yet, another problem arises...
When the list view is in the report mode, how can I determine when a header button is clicked, and determine which one was clicked???????
thanx in advance

To identify a header column click, you need to handle the WM_NOTIFY/HDN_ITEMCLICK message. Normally this message will be received by the header's parent control (i.e. the listview) -- some frameworks may redirect the message to the header control itself. I haven't worked with MFC in 10 years so I can't really if it reflects notification messages back to the control.
If you're trying to implement column sort, do yourself a favor and check out the Windows Template Library (WTL) at sourceforge.net. It's a set of C++ template classes that provide a thin yet useful wrapper around the standard Windows UI components. One of the classes is a sortable listview control. I've been using WTL with big Windows for more than 5 years -- you couldn't pay me to go back to MFC.

hi,
I have seen the WTL library and it seems very useful and time-saver, but I have a couple of questions about it:
1. can WTL 8.0 be installed with VC++ 6.0, specifically the appwizard stuff??how?? I see only javascript files of vc7.0 and 7.1 and 8.0!!
2. is there a good documentation about those classes??
Mohammad

I don't know about WTL 8; I'm still using WTL 7.5 with VS .Net 2003 for all my Win32 development. My guess is that it wouldn't work too well, as WTL is based on ATL, which has substantially changed between VC 6 and 7.
Good references for WTL include www.codeproject.com/wtl, and the WTL group over at Yahoo groups (reflected at www.gmane.org).

My newbie thread.

Some background: 10 years ago I had classes in basic, pascal, and c++( I missed something simple some where with functions or classes which messed me up in this I believe.)
So far I've watched a tutorial and set up my emulator and eclipse..
http://www.youtube.com/watch?v=z7bvrikkG7c
I then did a tutorial that ran my first program helloworld
http://www.youtube.com/watch?v=2gdhvwYUNJQ
I then did a tutorial and made a simple program that changes between two screens on a button click ( Why it is an hour long is beyond my understanding)
http://www.youtube.com/watch?v=m-C-QPGR2pM
I've proceeded to learning how to create menus and simply retrieved example code from the Google android site
Source: http://developer.android.com/guide/topics/ui/menus.html
Here's an example of this procedure, inside an Activity, wherein we create an Options Menu and handle item selections:
/* Creates the menu items */
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, MENU_NEW_GAME, 0, "New Game");
menu.add(0, MENU_QUIT, 0, "Quit");
return true;
}
/* Handles item selections */
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case MENU_NEW_GAME:
newGame();
return true;
case MENU_QUIT:
quit();
return true;
}
return false;
}
Click to expand...
Click to collapse
As I copy and pasted it into ecplise within an Activity, I realize there is some assumed information that I am missing when i received a bunch of errors
So.. I found A video tutorial
http://www.youtube.com/watch?v=6UYNnQOxCS8
and it instructs me to make sure I put these two lines of codes in first
Private static final int MENU1 = MENU.FIRST;
private static final int MENU2 = MENU.FIRST + 1;
I under line the menu's because it gives me errors on them as well... there seems to be some assumed knowledge I'm missing as well....
What specific piece of information am I missing to not have known that i would need those two lines as well as what I need to do to know the appropriate fix out of the suggestions they give me...
Are there any online tutorials or videos that'll bring me up to speed specifically with programming android apps... all the stuff I find just keeps leading me down a path to where I realize I've gotten ahead of myself because people are teaching things while assuming certain knowledge is known.
The tutorial I am following and getting errors on is for an 8th grade class of students...

Me: I'm pissed at that java toturial...
http://forum.xda-developers.com/showpost.php?p=6521891&postcount=6
Bastards.

Following the suggestion from this post
http://forum.xda-developers.com/showpost.php?p=6522089&postcount=7
I obtained a copy of Hello android.
Following the example to create a menu I used the code
I place this into my strings.xml
<string name="settings_label">Settings...</string>
name="settings_title">Sudoku settings</string>
<string
<string name="settings_shortcut">s</string>
<string name="music_title">Music</string>
<string name="music_summary">Play background music</string>
<string name="hints_title">Hints</string>
<string name="hints_summary">Show hints during play</string>
Click to expand...
Click to collapse
I place this into my main.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/settings"
android:title="@string/settings_label"
android:alphabeticShortcut="@string/settings_shortcut" />
</menu>
Click to expand...
Click to collapse
I import this files into my src app.java
right uner the other imports
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
Click to expand...
Click to collapse
I place this inside my activity ( where I think it would belong since it doesn't say where to put it. ) and ERROR
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
Click to expand...
Click to collapse
Quick fix says that menu needs to be either a field or constast so i give it a go and click field and it modifies a file called R.java.
I go back to app.java and not only is the menu highlighted but now R.menu.menu is entirely highlighted and says cannot be resolved or is not a field..
I try to modify the R.java file to remove what its done...
It won't let me..
Epic fail. on the third tutorial to create a menu.
I guess ill redo everything in a new project and then do the quick fix making menu a constant....
[edit] never mind ill look else where for help
http://www.youtube.com/watch?v=X3QO0ffg2Tc&feature=related

ok the toturial looks like it will work but when he types in this line in his app.java
public boolean onCreateOptionsMenu(Menu menu) {
Click to expand...
Click to collapse
it is under lined with an error on his screen as well as mine and then he says he is importing the missing classes and the error just disappeas with no demonstrations of what missing classing or what key combination he used to import them...
http://www.google.com/#hl=en&q=impo...=f&aqi=&aql=&oq=&gs_rfai=&fp=d059ab474882bfe2
WOO HOO found what he left out...
Compiled and installed...
Boo hoo menu key does nothing!! time to go back through the other menu tutorials and see if i cant get it working now that i know of this hot key..

Went back to this toturial with the elusive import missing classes hotkey..
http://www.youtube.com/watch?v=6UYNnQOxCS8
It worked like a charm
just had to remove
newGame();
and
quit();
and i have buttons that do nothing so far

More missing pieces.
I created a new activity as shown to me in previous tutorials giving it its own seperate XML file in the res/layouts as well as a jave file and I made sure it is calling for the right layout.
I also added the activity in the androidmanifest as shown to me as well..
off this site
http://developer.android.com/guide/topics/ui/menus.html
I've taken the code to create menus.. ( i got it working )
I then followed this and made the changes
Set an intent for a single menu item
If you want to offer a specific menu item that launches a new Activity, then you can specifically define an Intent for the menu item with the setIntent() method.
For example, inside the onCreateOptionsMenu() method, you can define a new menu item with an Intent like this:
MenuItem menuItem = menu.add(0, PHOTO_PICKER_ID, 0, "Select Photo");
menuItem.setIntent(new Intent(this, PhotoPicker.class));
Android will automatically launch the Activity when the item is selected.
Note: This will not return a result to your Activity. If you wish to be returned a result, then do not use setIntent(). Instead, handle the selection as usual in the onOptionsMenuItemSelected() or onContextMenuItemSelected() callback and call startActivityForResult().
Click to expand...
Click to collapse
It doesn't work... I don't understand why the intent would be in the onCreateOptionsMenu... it doesn't seem to work so I tried the alternative and replaced setIntent with with startActivityForResult.. and then I noticed it says "As usual" in the onOptionsMenuItemSelected()... which is where I would think the code would belong in the first place... but when I originally failed and tried to move the code there it errors...
Is ever step of the way really going to be half assed instructions.. i was beginning to think I had the hang of this.
Are the instructions bad or am i missing something???
Guess ill go dig in my hello android book.
EDIT: Wow that helped
startActivity(new Intent(this, register.class));
Click to expand...
Click to collapse
guess that book is worth something after all...
guess im just intending to start an activity with a particular intent and setting an intent alone isn't going to start the activity.... i suppose there must be some purpose behind setting an intent as they had describe on the google page.. just not seeing it yet...
Got to what i wanted tho.

[Q] Basic Questions - Refreshing Adapters/Global Variables

Hi,
I have been trying to get to grips with Android.
First off I guess, any good books you can recommend? I have Hello, Android which has some good examples, but some of the things leave me a little cold in that it seems overly simplistic and then seems to fail to pick up on some latter crucial points, not least about creating custom adapters.
Anyhow, back to the questions.
Firstly, various devices, like the Samsung Galaxy S uses a "blue" summary line in its settings menus. Looks good. But if you want to mimic that style outside of a summary menu, is it possible to get details of system colours?
Secondly, in terms of icon design, tab icons in as defined in the Android SDK seem to suggest using a Grey icon for off and a white icon for on. This seems to bit a bit foolish when the tabs are white.... and most of the other programs I've seen that use tabs have Grey icons for on and white icons for off! Thoughts?
Third, back to this book, one of the examples it gives, is a way to load data from a SQL database using Cursors and SimpleAdapters. Im guessing if I want anything more than a relatively simple list and data pulled from the database, that Im going to need to use a CustomAdapter.
In terms of these cursors though, some of the code does this in the onCreate:
Code:
Cursor cursor
CustomDatabaseHelper test = new CustomDatabaseHelper(this);
try {
cursor = getData();
showData(cursor);
} finally {
test.close();
}
I think I found a couple of problems with that... The CustomDatabaseHelper and Cursor are both local to the onClick method and therefore if I need to access these via a Buttons onClick Im stuffed unless I make them private/public to the class. I don't know the best way around this TBH, what would you suggest? I guess I could define another CustomDatabaseHelper in the onClick method, but Im not sure whether it is a good idea to keep opening all these references.
Plus as well in onClick, you can't give a context of "this" because it's it's not a context there its an OnClickListener?
Code:
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
}
}
And there must be a better way of refreshing the data set? I've tried cursor.notify, test.notify and globalising the adapter and doing adapter.notifyDataSetChanged(); things still don't refresh.
Im going to guess this is a pretty basic and common issue for newcomers trying to understand this that super context intent.
I think Im getting there, Im just trying to get a bit of background to a few of the basic issues Im having a bit of trouble with and find out what the best way to handle the issues are.
Oh, the showData function (which I call after any data change at the moment), does this:
Code:
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.test_item, cursor, Columns, TO);
I think that'll do for now, as my next issues are about SQL, Dates and Formatting.
Thanks
Simon

I think my problem stems around this book of mine... I can do a "notifyDataSetChanged()" on the adapter provided I don't do the "test.close" as above.
This suggests to me the DB Helper should be open across the activity lifetime.
Is that right?

Button2 doesnt work until Button1 is clicked

Hi All!
I'm new here and new to the Android Eclipse/development side and I'm having a bit of a problem with a java script.
I have a small advertising app with 2 buttons (looking to expand to 4 but that's a different thread), one for Facebook (Button1) and one for Twitter (Button2) and Button2 won't work until Button1 is clicked. It works fine except for that.
Any ideas on solutions? Aggravating me a bit lol
Thanks!!

We will need to see your layout XML and java code to help out.

not sure how i'd do that atm cos im a new member? i know that some admin members get pi**y when you dont wrap any code for formatting reasons??
i've got ready and i can imagine a senior member such as yourself will notice the mistake straight away.

Use pastebin http://pastebin.com/

not sure how to use it, just tried and i got the same message about not being able to post things outside links until 10 posts and so on? even tried pasting the raw text and still wouldnt let me
any suggestions?
thanks

Or use the CODE tags: [CODE ] and [/CODE ], but without the extra spaces.

adamj1910 said:
not sure how to use it, just tried and i got the same message about not being able to post things outside links until 10 posts and so on? even tried pasting the raw text and still wouldnt let me
any suggestions?
thanks
Click to expand...
Click to collapse
Take http off or www and just paste it as text

pastebin.com/4Q0g9ryg
pastebin.com/rHvFePNM
hopefully that should work?
thanks!

You had your button definition in the wrong place for your twitter button
Code:
package com.MYAPP.MYAPP;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
/** Called when the activity is first created. */
[user=439709]@override[/user]
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); //Set the screen's view to your xml file
Button facebookbutton = (Button) findViewById(R.id.button1); // Retrieve the button from the XML file
facebookbutton.setOnClickListener(new View.OnClickListener() { //Add a listener for when the button is pressed
[user=439709]@override[/user]
public void onClick(View v) {
sendToFacebook();
}
});
Button twitterbutton = (Button) findViewById(R.id.button2); // Retrieve the button from the XML file
twitterbutton.setOnClickListener(new View.OnClickListener() { //Add a listener for when the button is pressed
[user=439709]@override[/user]
public void onClick(View v) {
sendToTwitter();
}
});
}
protected void sendToFacebook() {
String url = "https://www.facebook.com"; // You could have this at the top of the class as a constant, or pass it in as a method variable, if you wish to send to multiple websites
Intent i = new Intent(Intent.ACTION_VIEW); // Create a new intent - stating you want to 'view something'
i.setData(Uri.parse(url)); // Add the url data (allowing android to realise you want to open the browser)
startActivity(i); // Go go go!
}
protected void sendToTwitter() {
String url = "https://www.twitter.com"; // You could have this at the top of the class as a constant, or pass it in as a method variable, if you wish to send to multiple websites
Intent i = new Intent(Intent.ACTION_VIEW); // Create a new intent - stating you want to 'view something'
i.setData(Uri.parse(url)); // Add the url data (allowing android to realise you want to open the browser)
startActivity(i); // Go go go!
}
}

Thanks for that ill give that a try!!! Really appreciate it
Sent from my GT-I9305 using xda app-developers app

it works!!! would i just repeat that for any additional buttons, same format;
Button onclicklistener etc etc etc
Button onclicklistener etc etc etc
protected void
protected void
and so on
does it work like that?
thanks!

Yes, just besure you place the code in your onCreate method for defining your buttons

Ill remember that haha thanks again really appreciate it!! =D
Sent from my GT-I9305 using xda app-developers app

zalez said:
Yes, just besure you place the code in your onCreate method for defining your buttons
Click to expand...
Click to collapse
Hey zalez
I just tried adding a youtube button in the exact same format obviously changing the button source and so on, eclipse couldn't find any problems so I ran it and it just crashed the app on the avd and on a real device?
Sent from my GT-I9305 using xda app-developers app

There are multiple ways. I like setting a listener, then using an onClick method with switch-case statements for every button.
Sent from my GT-I9300 using Tapatalk 4

you've lost me lol i understand the onclick but switch cases? if you check my .xml and .java from pastebin or the .java that another member posted further up ^ ^ ^ ^ that might show where im going wrong?
edit *** i just googled the switch case thing and ive seen it before, just not sure how i'd implement it into my .java?
thanks

bump?

adamj1910 said:
you've lost me lol i understand the onclick but switch cases? if you check my .xml and .java from pastebin or the .java that another member posted further up ^ ^ ^ ^ that might show where im going wrong?
edit *** i just googled the switch case thing and ive seen it before, just not sure how i'd implement it into my .java?
thanks
Click to expand...
Click to collapse
Sorry, I'm away. I'll look up an example from one of my apps later.
Basically, just make an onClickListener. You are then required to use that interface and implement the onClick method. Do that, you have an empty method, with a parameter like View v.
Then, make a switch statement for v.getId(), and do cases for the buttons (use their XML IDs!) that you have.
Hope that's kind of clear?
Sent from my GT-I9300 using Tapatalk 4

bassie1995 said:
Sorry, I'm away. I'll look up an example from one of my apps later.
Basically, just make an onClickListener. You are then required to use that interface and implement the onClick method. Do that, you have an empty method, with a parameter like View v.
Then, make a switch statement for v.getId(), and do cases for the buttons (use their XML IDs!) that you have.
Hope that's kind of clear?
Sent from my GT-I9300 using Tapatalk 4
Click to expand...
Click to collapse
That's actually starting to make sense! But it's just putting that into a script, not really my strong point yet, I'm more of a designer lol
It would be good if you could find some examples for URL buttons, it'd really help. Thanks!

There shouldn't have been any issues adding more. I would need to see your updated java code. Using switch cases is a good idea but at this point, if I was you, I would avoid it for now until you get the hang of the basics. Also, a log cat would be beneficial in debugging.

Need help in making a simple app

Hello everyone ^_^
Ive been making zooper themes for some time, as well as Themer themes. What i would love to do now is to create an app that can install a zip file to a specific folder on the storage. I wish to make a Material themed app for installing the zip, that can show scereenshots or other shots which i use to display my themes. Also, I wish to include a link for the wallpaper for that specific theme. Ive scoured the internet a bit for this type of thing, and so far, ive been unable to find anything that would suit my requirement.
help would be appreciated a lot
PS, i havent done app developing or coding in a few years so you could say that im kinda noob to this now so guidance from scratch would be very helpful ^_^

You can use below code to create a zip and place it wherever you want.
Code:
private static void zipFolder(String inputFolderPath, String outZipPath) {
try {
FileOutputStream fos = new FileOutputStream(outZipPath);
ZipOutputStream zos = new ZipOutputStream(fos); File srcFile = new File(inputFolderPath);
File[] files = srcFile.listFiles();
Log.d("", "Zip directory: " + srcFile.getName());
for (int i = 0; i < files.length; i++) {
Log.d("", "Adding file: " + files[i].getName());
byte[] buffer = new byte[1024];
FileInputStream fis = new FileInputStream(files[i]); zos.putNextEntry(new ZipEntry(files[i].getName()));
int length;
while ((length = fis.read(buffer)) > 0) {
zos.write(buffer, 0, length); }
zos.closeEntry();
fis.close();
}
zos.close();
}
catch (IOException ioe) { Log.e("", ioe.getMessage());
}
}
And for the second one.
You can simple use intent to open your link in browser.
Intent n = new Intent(Intent.ACTION_VIEW , Uri.parse("link to your wallpaper"));
Sent from my A0001 using Tapatalk 2

Android Application Development Request
I am in need of some help I have a great idea for a new app that may change the face of advanced research. This will allow for the user to search all day and all night. While they are handling everyday life issues and events with family and what not. Yet still, allowing them to locate what they are looking for. Also will allow people with artifacts in there home. That the user may think is not worth anything yet it may be a goldmine. So instead of the user having to do research trying to locate these specific artifacts to see if they are worth money. This app will allow them to do advanced research all day with a touch of a button my idea is revolutionary when it comes to the advanced research that needs to be done. Please, I am looking for somebody to help me develop this app and bring it to life. So that I may present this idea to google for a possible sale. Thank you for your consideration ahead of time on helping me with this application.