问题描述
我在res文件夹一个Settings.xml以管理用户设置。我加载到一个片段这一点。我需要将这些设置保存到后端服务为了这个,我想知道已经什么值由用户或用户随时改变的设置我想知道,这样我更新有关设置的服务器。
I have a settings.xml in my res folder to manage user settings. I load this into a fragment. I require to store these settings to a backend service for this I want to know what values have been by the user or whenever user changes a setting I want to know so that I update the server about the settings.
我曾尝试,如下面的code,但我无法读出的值多种方法。我试图把面包和日志语句来检查监听器,但没有什么是出现表明听众是没有得到调用。难道我做错了什么?
I have tried many approaches as shown in the code below but I am unable to read the value. I tried putting Toast and log statements to check the listeners but nothing is appearing which indicates that listener is not getting called. Am I doing something wrong?
UserSettingFragment.java
UserSettingFragment.java
public class UserSettingFragment extends PreferenceFragment implements OnSharedPreferenceChangeListener {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.settings);
//Method 1
PreferenceScreen shared = getPreferenceScreen();
shared.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
// TODO Auto-generated method stub
Toast.makeText(getActivity().getApplicationContext(), "Changed", Toast.LENGTH_LONG).show();
Log.d("preference", "change");
return true;
}
});
final SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
Preference gender = (Preference) findPreference("gender");
//Method 2
// Get the custom preference
Preference mypref = (Preference) findPreference("mypref");
mypref.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
// TODO Auto-generated method stub
String highScore = sharedPref.getString("gender", "Male");
Toast.makeText(getActivity().getApplicationContext(), "Changed to " + highScore, Toast.LENGTH_LONG).show();
Log.d("preference", "change");
return false;
}
});
} //Method 3
@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
String key) {
// TODO Auto-generated method stub
Toast.makeText(getActivity().getApplicationContext(), "Changed", Toast.LENGTH_LONG).show();
}
}
的settings.xml
settings.xml
<?xml version="1.0" encoding="utf-8"?>
<SwitchPreference
android:key="gender"
android:title="I am"
android:switchTextOn="Female"
android:switchTextOff="Male"
/>
</PreferenceCategory>
推荐答案
由于您使用的是 preferenceFragment
您需要注册和注销 OnShared preferenceChangeListener
在方法 onResume
和的onPause
方法#3 的,你在你的问题中提到。
Since you are using a PreferenceFragment
you need to register and unregister OnSharedPreferenceChangeListener
in the onResume
and onPause
methods for method #3 that you mentioned in your question.
public class UserSettingFragment extends PreferenceFragment implements SharedPreferences.OnSharedPreferenceChangeListener {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.settings);
}
@Override
public void onResume() {
super.onResume();
getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}
@Override
public void onPause() {
super.onPause();
getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
}
@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
Toast.makeText(getActivity().getApplicationContext(), "Changed key: " + key, Toast.LENGTH_LONG).show();
}
}
<一个href=\"http://stackoverflow.com/questions/13596250/how-to-listen-for-$p$pference-changes-within-a-$p$pferencefragment\">Reference
这篇关于安卓:无法从settings.xml中获得preference值的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!