[android-developers] Re: two threads, the main closes the DB but the second is still running and need to use the DB!
Dianne, Thanks a lot for your answers. Really helpful! Another question, just to make sure I understood what you meant: The main UI thread isn't destroyed. Well, it is destroyed when the process is killed, and at that point it doesn't matter because the entire process is gone. It means that any secondary threads is living within the process and it is not a process by itself? Thx, polo On Jan 21, 5:16 pm, Dianne Hackborn hack...@android.com wrote: On Wed, Jan 21, 2009 at 5:01 PM, polo777 polodr...@yahoo.com wrote: 1 - What would be the life cycle of this class singleton if the user sends the application (and so the activity that was displayed) in the background and the activity is destroyed for instance? 2 - How to make sure this singleton will stay alive as long as the secondary thread needs? If you want to have work happening while in the background without the system thinking you are just a background app and available to be killed, you need to start a Service and have the work associated with that. 3 - I still don't really understand what happens when the secondary thread posts runnable toward the UI main thread that has been destroyed or sent to the background! The main UI thread isn't destroyed. Well, it is destroyed when the process is killed, and at that point it doesn't matter because the entire process is gone. -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support. All such questions should be posted on public forums, where I and others can see and answer them. --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] How to know which element of my list is selected when long click
Hi everyone, I have a list using a customized BaseAdapter. When one element of the list is hit during a long time, a contextual menu appears. I want to use this one to delete or edit the selected item but I don't know how to get id or anything else that could help me. I tried getListView.getSelectedItem() thinking that it will give me the object returned by the method getItem(int position) inherited in my customized BaseAdapter. I got null. When I tried getSelectedItemId(), I got -1. Does someone have a solution? Thanks a lot, Polo --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: two threads, the main closes the DB but the second is still running and need to use the DB!
Another problem related to this one. When the secondary thread post back to the main thread, the main thread fetches data from the DB and update the view. Here also I got an error. It is perfectly normal since the application has been killed. How to handle that? Thanks a lot in advance. On Jan 21, 2:45 pm, polo777 polodr...@yahoo.com wrote: Hi everyone, I have two threads: - the main one in charge of the UI - a second one that takes care of network calls, parsing responses and database updates. The main threads open the database, retrieves information into a Cursor that is used to feed a listView. My problem is the following: When I close the application the activity is destroyed, the second thread can still be running and thereby still can update the DB. Since the main thread open the DB, I want to close it to do the stuffs properly. However if I close it within the onDestroy method and if the second thread is running and is about to update the DB, I get an error. What is the best way to handle this situation? Thanks a lot Polo --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: two threads, the main closes the DB but the second is still running and need to use the DB!
Yes, I didn't think about that! That could definitely help me! But in this case: 1 - What would be the life cycle of this class singleton if the user sends the application (and so the activity that was displayed) in the background and the activity is destroyed for instance? 2 - How to make sure this singleton will stay alive as long as the secondary thread needs? 3 - I still don't really understand what happens when the secondary thread posts runnable toward the UI main thread that has been destroyed or sent to the background! Thanks a lot for your answer, It really helps me! Polo On Jan 21, 4:16 pm, Dianne Hackborn hack...@android.com wrote: I would recommend having a singleton that all of the clients go through, which takes care of keeping the database open as long as there are clients of it. On Wed, Jan 21, 2009 at 2:45 PM, polo777 polodr...@yahoo.com wrote: Hi everyone, I have two threads: - the main one in charge of the UI - a second one that takes care of network calls, parsing responses and database updates. The main threads open the database, retrieves information into a Cursor that is used to feed a listView. My problem is the following: When I close the application the activity is destroyed, the second thread can still be running and thereby still can update the DB. Since the main thread open the DB, I want to close it to do the stuffs properly. However if I close it within the onDestroy method and if the second thread is running and is about to update the DB, I get an error. What is the best way to handle this situation? Thanks a lot Polo -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support. All such questions should be posted on public forums, where I and others can see and answer them. --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Activity goes to background but secondary thread needs to end its work
Hi Everyone, I am currently working on an app that uses two threads: The first main UI one and a secondary one that I use to retrieve some data from the network, parse them and finally add them into a database. My question is regarding to the lifecycle of my thread. The problem is simple, I need the thread to end the work it is doing. The user can close the activity or send it to the background at anytime which is not a problem for the main thread that take cares of the UI but the secondary thread is still running and can be killed at anytime stopping its work in a way that we don't control anything (could be working on the database, parsing...). What is the best solution to handle this problem? Thanks a lot in advance. Polo --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Activity goes to background but secondary thread needs to end its work
Ok thanks for your answer. I am going to investigate in this way. However, according to my understanding, even though the service will have a longer life time than the thread, it still can be killed. Then, for a real safe mechanism I guess I have to take care of the problem differently meaning perhaps changing the nature of my code. On Dec 17, 4:06 pm, Al alcapw...@googlemail.com wrote: You could create a service for the background task. Create your main Activity, call startService(), inside the service, create a thread, finish your work, then call stopSelf() to stop your service. Have a look athttp://code.google.com/android/reference/android/app/Service.html. Services usually last longer and killed later then usual activities when memory is low. On Dec 17, 11:47 pm, polo777 polodr...@yahoo.com wrote: Hi Everyone, I am currently working on an app that uses two threads: The first main UI one and a secondary one that I use to retrieve some data from the network, parse them and finally add them into a database. My question is regarding to the lifecycle of my thread. The problem is simple, I need the thread to end the work it is doing. The user can close the activity or send it to the background at anytime which is not a problem for the main thread that take cares of the UI but the secondary thread is still running and can be killed at anytime stopping its work in a way that we don't control anything (could be working on the database, parsing...). What is the best solution to handle this problem? Thanks a lot in advance. Polo --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Issues: Webview.loadData() trying to load a string created from a read file(asset) and a string
Hi, Finally I created the content provider overriding the openFile method so that I can use loadUrl() but still a part of the Javascript (of the page loaded) that worked when it was loading from the web or an asset file doesn't work here. I got a WebCore error telling me there is a parsing issue!!! The content is exactly the same. Looks like the WebKit doesn't work the same whether the file is an asset, page loaded from Network or a string or a text from a file (ContentProvider solution). This problem drives me crazy! Polo On Nov 21, 4:56 pm, polo777 [EMAIL PROTECTED] wrote: I am gonna give a try and let you know. Thanks Mark! On Nov 21, 4:45 pm, Mark Murphy [EMAIL PROTECTED] wrote: polo777 wrote: After having tried to use addJavascriptInterface, I start working on the ContentProvider-based solution that you described. With this solution can I just create/open/read/delete a file in which I would store my string (javascript + html) so that I could use loadUrl or loadDataWithBaseURL properly using the url content:// blabla.provider? In theory, yes. I haven't tried it myself, though I should be giving that a shot sometime next week, I think. I've seen other posts on these lists that suggest others have it working, though it is not exactly trivial. -- Mark Murphy (a Commons Guy)http://commonsware.com Android Training on the Ranch! -- Mar 16-20, 2009http://www.bignerdranch.com/schedule.shtml --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Content Provider: create/open a file in the overrided openFile function
Hello Everyone,
I am trying to override the openFile function of a contentProvider so
that I can use the URI in the loadURL function. The following code is
really spread on the forum but nobody seems to meet any problems on
this line File file = new File(...).
As far as I am concerned, I got a FileNotFoundException and I really
dont understand why!
If anyone has an idea that would be great.
Thanks in advance
Polo
private static final String file_path = file:///data/data/
com.android.orange.myApp/files;
private static final String file_name = HtmlView;
@Override
public ParcelFileDescriptor openFile(Uri uri, String mode)
{
try
{
mDbH.open();
// content that I want to add in my file
Cursor c = mDbH.fetchContent();
String content = c.getString(c.getColumnIndex
(DbAdapter.KEY_WEBVIEW_CONTENT));
c.close();
mDbH.close();
//
File file = new File(file_path,file_name);
FileWriter out;
out = new FileWriter(file);
out.write( );
out.close();
}
catch (FileNotFoundException ex)
{
// Checked for file existance already, so this should
not happen
return null;
}
catch (IOException ex)
{
// read or close failed
return null;
}
int m = ParcelFileDescriptor.MODE_READ_ONLY;
if (mode.equalsIgnoreCase(rw))
m = ParcelFileDescriptor.MODE_READ_WRITE;
if (file.canRead())
{
ParcelFileDescriptor pfd =
ParcelFileDescriptor.open(file, m);
}
ParcelFileDescriptor pfd = ParcelFileDescriptor.open(file, m);
return pfd;
}
catch (FileNotFoundException e)
{
}
return null;
}
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[android-developers] Issues: Webview.loadData() trying to load a string created from a read file(asset) and a string
Hi Everyone,
I want to display into a WebView the concatenation of a string and the
content of a file located in my asset.
With the code below, when I display the string in my log it looks
perfect but when I launch the activity I just get the following
message: Web page not available the web page at data:text/html;utf-8
and then the content of my string/page escaped... might be temporarly
down or it may have moved permanently ro a new web address.
InputStreamReader is = new
InputStreamReader(getAssets().open
(header.html));
//
BufferedReader buff = new BufferedReader(is);
//
StringBuffer out = new StringBuffer();
//
String strLine = null;
//
while ((strLine = buff.readLine()) != null)
{
out.append(strLine);
}
//
is.close();
String mimeType = text/html;
String encoding = utf-8;
String fin = new String(out.toString());
mWebView.loadData(fin, mimeType, encoding);
Does someone have a solution? That would be great.
Thanks a lot in advance.
polo
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[android-developers] Re: Issues: Webview.loadData() trying to load a string created from a read file(asset) and a string
Re, Actually, I still have a problem. When I use this trick, the javascript containing in my page doesn't work whereas the same page(html/javascript) works when I load it from the network or from a file:///android_asset/myfile.html. Anything? Polo On Nov 21, 1:06 pm, polo777 [EMAIL PROTECTED] wrote: Thanks a lot of Mark. This workaround did the trick. String mimeType = text/html; String encoding = utf-8; mWebView.loadDataWithBaseURL(fake://fake.com, out.toString(), mimeType, encoding, null); Regards, Polo On Nov 21, 11:42 am, Mark Murphy [EMAIL PROTECTED] wrote: polo777 wrote: Does someone have a solution? That would be great. Use loadDataWithBaseURL(), even if you have to pass in a fake URL. -- Mark Murphy (a Commons Guy)http://commonsware.com Android Training on the Ranch! -- Mar 16-20, 2009http://www.bignerdranch.com/schedule.shtml --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Issues: Webview.loadData() trying to load a string created from a read file(asset) and a string
Hi Mark, First thanks a lot for your answers... After having tried to use addJavascriptInterface, I start working on the ContentProvider-based solution that you described. With this solution can I just create/open/read/delete a file in which I would store my string (javascript + html) so that I could use loadUrl or loadDataWithBaseURL properly using the url content:// blabla.provider? I am not sure exactly how to proceed. Thanks Polo On Nov 21, 4:26 pm, Mark Murphy [EMAIL PROTECTED] wrote: polo777 wrote: Re, Actually, I still have a problem. When I use this trick, the javascript containing in my page doesn't work whereas the same page(html/javascript) works when I load it from the network or from a file:///android_asset/myfile.html. Anything? Your simple options are: 1. Instead of your fake base URL, use a real network URL pointing to the spot where the Javascript, images, and other stuff lives. Of course, this will require a network connection to work. You may wish to also supply your WebView with a WebViewClient implementation, so you can hook shouldOverrideUrlLoading() to determine if a given clicked-upon link should go to the Internet or should be loaded from your locally-generated content. 2. Don't use WebView for locally-generated material. Your more complicated options include building a ContentProvider for serving your HTML, Javascript, and whatnot, and using the appropriate content: URL to load it. In general, Android makes it rather difficult for one to support locally-hosted Web content. -- Mark Murphy (a Commons Guy)http://commonsware.com Android Training on the Ranch! -- Mar 16-20, 2009http://www.bignerdranch.com/schedule.shtml --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: Issues: Webview.loadData() trying to load a string created from a read file(asset) and a string
I am gonna give a try and let you know. Thanks Mark! On Nov 21, 4:45 pm, Mark Murphy [EMAIL PROTECTED] wrote: polo777 wrote: After having tried to use addJavascriptInterface, I start working on the ContentProvider-based solution that you described. With this solution can I just create/open/read/delete a file in which I would store my string (javascript + html) so that I could use loadUrl or loadDataWithBaseURL properly using the url content:// blabla.provider? In theory, yes. I haven't tried it myself, though I should be giving that a shot sometime next week, I think. I've seen other posts on these lists that suggest others have it working, though it is not exactly trivial. -- Mark Murphy (a Commons Guy)http://commonsware.com Android Training on the Ranch! -- Mar 16-20, 2009http://www.bignerdranch.com/schedule.shtml --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Extend a EditText to create an editable view performing operation onKeyDown
Hi Everyone,
I am trying desperately to extend the EditText view to override
onKeyDown. My goal is to create an EditText that will update UI
elements each time the user will type one character within.
The code is as simple as that:
public class SearchView extends EditText
{
public SearchView(Context context)
{
super(context);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
// the code (right now nothing)
return true;
}
}
The main package is com.android.polo.myApp
It is located in the package com.android.polo.myApp.view
Here is the View.xml using this new view:
LinearLayout xmlns:android=http://schemas.android.com/apk/res/
android
android:orientation=horizontal
android:layout_width=fill_parent
android:layout_height=wrap_content
com.android.polo.myApp.view.SearchView
android:id=@+id/searchTextView
android:layout_width=fill_parent
android:layout_height=wrap_content/
/LinearLayout
I got this error:
11-06 19:00:21.555: ERROR/AndroidRuntime(1207):
java.lang.RuntimeException: Unable to start activity
ComponentInfo.. android.view.InflateException: Binary XML file
line #28: Error inflating class com.android.polo.myApp.view.SearchView
11-06 19:00:21.555: ERROR/AndroidRuntime(1207): Caused by:
android.view.InflateException: Binary XML file line #28: Error
inflating class com.android.polo.MyApp.view.SearchView
..
11-06 19:00:21.555: ERROR/AndroidRuntime(1207): Caused by:
java.lang.NoSuchMethodException: SearchView
Thanks a lot in advance
Polo
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[android-developers] Re: SharedPreferences: editor.commit() always false even though it commits
Hi Jason,
Thanks a lot for your answer.
Regarding the security stuff, I created a md5 function that I apply on
the password to then store it within the preferences file. As you
said, at least it won't be stored plaintext.
Again, thank you
Bye
On Nov 4, 11:23 pm, Jason Parekh [EMAIL PROTECTED] wrote:
Yup, the returning of false was a bug and you'll find it fixed in a future
update.
Re: storing credentials. Is there any way you can get by without storing
the actual password? Perhaps use the password to get some token from the
service? If you absolutely have to store the password, I'd suggest at least
encrypting it with a key that's hard coded in your app (yes, this is still
not secure, but at least it won't be stored plaintext).
jason
On Tue, Nov 4, 2008 at 1:51 PM, polo777 [EMAIL PROTECTED] wrote:
Hi everyone,
Almost everything is in the title. I am trying to save username and
password into the sharedpreferences file. I used the little function
below to do so:
Everything works (The data are written correctly, I can read them
afterward) but the editor.commit() always returns false even though
the commit works(). Is that a bug?
private void saveCredential(String username, String password)
{
// Restore or Create preferences if it doesn't exist
SharedPreferences settings =
getSharedPreferences(Common.PREFS_NAME,
MODE_PRIVATE);
// We need an Editor object to make changes in the
preferences file
SharedPreferences.Editor editor = settings.edit();
// Then we add the login and the password
editor.putString(Common.PREF_USERNAME,username);
editor.putString(Common.PREF_PASSWORD,password);
// We don't forget to commit our edits
if (editor.commit())
Log.v(DEBUG_TAG, (Username: + username + ) ;
(password : + password + ) correctly added into file +
Common.PREFS_NAME);
else
// not good
}
If anyone has a solution, an answer, anything, that would be great ;)
Also in term of security, is that fine? Should I store the credential
into a database or anything else?
Thanks a lot.
Polo
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[android-developers] SharedPreferences: editor.commit() always false even though it commits
Hi everyone,
Almost everything is in the title. I am trying to save username and
password into the sharedpreferences file. I used the little function
below to do so:
Everything works (The data are written correctly, I can read them
afterward) but the editor.commit() always returns false even though
the commit works(). Is that a bug?
private void saveCredential(String username, String password)
{
// Restore or Create preferences if it doesn't exist
SharedPreferences settings =
getSharedPreferences(Common.PREFS_NAME,
MODE_PRIVATE);
// We need an Editor object to make changes in the preferences
file
SharedPreferences.Editor editor = settings.edit();
// Then we add the login and the password
editor.putString(Common.PREF_USERNAME,username);
editor.putString(Common.PREF_PASSWORD,password);
// We don't forget to commit our edits
if (editor.commit())
Log.v(DEBUG_TAG, (Username: + username + ) ;
(password : + password + ) correctly added into file +
Common.PREFS_NAME);
else
// not good
}
If anyone has a solution, an answer, anything, that would be great ;)
Also in term of security, is that fine? Should I store the credential
into a database or anything else?
Thanks a lot.
Polo
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