sharedpreferences

问题 So I am learning about SharedPreferences within Android. I thought I would quickly try and mock up something simple. When the user selects a particular option from a list of options (3 options in this case) - the layout file will change accordingly. However, it always assumes the default value supplied, hence never changes the layout when another option is selected - so when another option is selected, it is recorded fine, but the layout doesn't change, this leads me to believe that there is

问题 I tried to count the number of pressed button for each hours. To do this When I pressed the button, I save the current time in a variable to have a reference of the hours of the pressed button, if I press a second time the button, I want to compare the current time with the previous time saved to know if the hours has changed. If there is a different time I reset the counter to 0, else I increase the counter. Like this I can know how much I pressed the button for each hours. There may be a

问题 Picture, if you will: Applications A, B, C and D. All need to share some small amount of data between them but there is no guarantee that any of them will be installed. That is, you may have B and D only. Or A and C only, etc. Can SharedPreferences be used in this case? I understand that I can use createPackageContext to have A-D all use the package space of A, if A is like a master-app that is always installed, but what if I don't know which of these will be installed? createPackageContext

问题 I have an Array with integer values. It will grow over time. It will have approximately up to 50 values. I want to store the array persistent and thus I thought about storing it in SharedPreferences . I know that no complex types can be stored in it, but I also heard about to serialise the Array and then store it in SharedPreferences . Can someone give me a hint or even better sample code how to do that? 回答1: Not very efficient way, but will get the job done: SharedPreferences prefs = ...;

问题 i've got a simple PreferenceActivity. in my activity im using the values stored in those keys. through getDefaultSharedPreferences and getBoolean("somekey") if i now change the preference associated with "somekey", everything works fine and the getBoolean returns the right value. but if i set the value "somekey" to another value programatically, via Preferences.Editor the settings view doesn't update to the new value! like this: pref_edit.putBoolean("somekey", true); pref_edit.commit(); if

问题 I have a long list of booleans which i want to save In my app using shared preference, so that i can save the state of a number of checkboxes. i have tried a few approaches now, and am now so sick of the same code, that im even willing to ask for help. I would post my code, but there is so much greentext and redundant information that i dotn think its worth it. But if it helps. import java.util.HashMap; import java.util.Map.Entry; import android.content.Context; import android.content

问题 I have a couple of CheckBoxPreferences set up, my preference class extends PreferenceActivity and implements OnSharedPreferenceChangeListener This is what I'm using to respond to people checking/unchecking the CheckBoxPreferences : public void onSharedPreferenceChanged(SharedPreferences P, String K) { if (K.equals(CheckBoxPref_KEY_HERE)) { MyClass.BooleanVariable = P.getBoolean("CheckBoxPref_KEY_HERE", true); } } As far as I can tell, the onSharedPreferenceChanged method above is never even

问题 I'm using preferences.xml to allow selection of a ringtone (among other preferences). Here's the code <RingtonePreference android:key="shuttle_tone" android:ringtoneType="notification" android:showDefault="false" android:showSilent="true" android:defaultValue="content://settings/system/notification_sound" android:summary="Select the tone that signals the start of the next shuttle" android:title="Shuttle Tone" /> ... a bunch of other preferences The Preferences activity is initiated in the

问题 I am developing this quiz game. at the end of the game I show the user a detailed total score. What I want to develop here is a using sharedpreferences to store the value, be able to retrieve it using other activity showing the user's total score. I am only interested in storing one score for the quiz (initially). The reason I want to implement this is that in the future I will apply this for other quiz modes and show the total score for all quizzes in one activity called highscores. below is

问题 I keep getting an error that has to do with the preferences and I know it has depreciated so I looked here for help http://developer.android.com/reference/android/preference/PreferenceFragment.html and I did exactly as it says on the bottom part... Here is the error: 12-04 00:39:37.553: E/AndroidRuntime(1164): FATAL EXCEPTION: main 12-04 00:39:37.553: E/AndroidRuntime(1164): Process: com.proteintracker, PID: 1164 12-04 00:39:37.553: E/AndroidRuntime(1164): java.lang.RuntimeException: Unable