Hi jason,
that works!
Thanks for pointing me to it.
On Thu, Nov 6, 2008 at 10:40 AM, Jason Parekh <[EMAIL PROTECTED]> wrote:
> The SharedPreferences keep a cache in memory. So, when you remove the file,
> it ends up using the cached value (false) from memory.
>
> Try rm'ing the file, killing your process (from Devices tab in eclipse), and
> then relaunching.
>
> jason
>
>
> On Wed, Nov 5, 2008 at 3:30 AM, [EMAIL PROTECTED] <[EMAIL PROTECTED]>
> wrote:
>>
>> Hi,
>> I noticed an interesting but unexpected behaviour with preference
>> processing in Android. Here's what I'm trying to do.
>> My app needs to perform some specific tasks when it is launched for
>> the first time after installation. I use an element named
>> "firstLaunch" for this purpose. I set its value to false in the first
>> launch so that subsequent launches will see it properly.
>>
>> Here's the piece of code:
>>
>> package com.example;
>> SharedPreferences prefs = getSharedPreferences("pref",
>> MODE_PRIVATE);
>> isFirstTimeLaunch = prefs.getBoolean("firstLaunch", true);
>> Log.d("readPreferences", "read first time launch value: " +
>> isFirstTimeLaunch);
>>
>> SharedPreferences.Editor editorPrefs = prefs.edit();
>> editorPrefs.putBoolean("firstLaunch", false);
>> editorPrefs.commit();
>>
>> So far so good. Everything works as expected. However, I wanted to
>> test its behavior when the preference file is removed. I removed the
>> file '/data/data/com.example/shared_prefs/pref.xml' and relaunched the
>> app within the emulator. To my surprise I found that my technique
>> fails -- the variable 'isFirstTimeLaunch' will be false, even if I
>> remove the preferences file.I repeated removing and launching the app
>> many times and I see the same result every time.
>>
>> However, if I run the program from within Eclise IDE or if I do an
>> 'adb install' from the shell, things work as expected.Obviously these
>> methods clear the app data. Isn't simply removing the preference file
>> same as removing data since my app doesn't use anything else?
>>
>> Am I missing something here? Can someone explain what's wrong with my
>> program?
>>
>> Thanks
>> Devi Prasad
>>
>>
>
>
> >
>
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