我是Java Android开发的初学者。我使用的是Eclipse SDK 3.6.1版本。我有一个带有两个复选框和一个后退按钮的首选项窗口。
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory
android:title="PIN requirement">
<CheckBoxPreference
android:title="Use PIN"
android:defaultValue="true"
android:key="checkboxPref" />
<CheckBoxPreference
android:title="Don't use PIN"
android:defaultValue="false"
android:key="checkboxPref2" />
</PreferenceCategory>
<PreferenceCategory>
<Preference
android:title="Back"
android:key="customPref" />
</PreferenceCategory>
</PreferenceScreen>
如何将两个CheckBox改成RadioButton组?
发布于 2011-02-16 20:51:57
如果您只需要启用或禁用使用PIN码,在这种情况下只有一个CheckBoxPreference就足够了(参见下面的示例代码,第一类)。当您需要从设置列表(ListPreference)中选择某种颜色(例如,请参阅示例代码,第二个类别)时,通常会使用RadioButtons。
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory
android:title="First Category">
<CheckBoxPreference
android:title="Using PIN"
android:defaultValue="false"
android:key="checkboxPref"
android:summaryOn="Disable PIN"
android:summaryOff="Enable PIN"/>
</PreferenceCategory>
<PreferenceCategory
android:title="Second Category">
<ListPreference
android:title="Pick your favourite color"
android:key="listPref"
android:defaultValue="4"
android:entries="@array/listArray"
android:entryValues="@array/listValues" />
</PreferenceCategory>
</PreferenceScreen>
此示例的源代码为:
public class PreferencesHelpExample extends PreferenceActivity implements OnSharedPreferenceChangeListener {
public static final String KEY_LIST_PREFERENCE = "listPref";
private ListPreference mListPreference;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
// Get a reference to the preferences
mListPreference = (ListPreference)getPreferenceScreen().findPreference(KEY_LIST_PREFERENCE);
}
@Override
protected void onResume() {
super.onResume();
// Setup the initial values
mListPreference.setSummary("Current value is " + mListPreference.getEntry().toString());
// Set up a listener whenever a key changes
getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}
@Override
protected void onPause() {
super.onPause();
// Unregister the listener whenever a key changes
getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
}
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
// Set new summary, when a preference value changes
if (key.equals(KEY_LIST_PREFERENCE)) {
mListPreference.setSummary("Current value is " + mListPreference.getEntry().toString());
}
}
}
对于ListPreference,您还需要一个arrays.xml文件,该文件位于"values“文件夹中:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="listArray">
<item>red</item>
<item>orange</item>
<item>yellow</item>
<item>green</item>
<item>blue</item>
<item>violet</item>
</string-array>
<string-array name="listValues">
<item>1</item>
<item>2</item>
<item>3</item>
<item>4</item>
<item>5</item>
<item>6</item>
</string-array>
</resources>
另请参阅使用PreferenceActivity的一些很好的示例-它们对我帮助很大:
How to create a group of RadioButtons instead of a list;
How to display the current value of an Android Preference in the Preference summary?
发布于 2012-06-05 16:51:25
在某些情况下,让首选项表现为单选按钮是一个很好的功能,例如,在每个选项下包含摘要文本的简单方式。
使一组复选框的行为类似于一组单选按钮非常简单。要在Preferences中执行此操作,请将组中的所有复选框注册到相同的OnPreferenceChangeListener,然后在此侦听器中使用findPreference()查找其他复选框,并调用setChecked(false);
public boolean onPreferenceChange(Preference preference, Object newValue) {
String key = preference.getKey();
if (key.equals("checkboxPref")) {
//Reset other items
CheckBoxPreference p = (CheckBoxPreference)findPreference("checkboxPref2");
p.setChecked(false);
}
else if (key.equals("checkboxPref2")) {
//Reset other items
CheckBoxPreference p = (CheckBoxPreference)findPreference("checkboxPref");
p.setChecked(false);
}
//Force the current focused checkbox to always stay checked when pressed
//i.e confirms value when newValue is checked (true) and discards newValue
//when newValue is unchecked (false)
return (Boolean)newValue;
}
唯一的缺点是复选框看起来不像单选按钮...
发布于 2015-07-15 02:38:11
试试这个:
@Override
public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, @NonNull Preference preference) {
CheckBoxPreference cb1 = null;
CheckBoxPreference cb2 = null;
ListAdapter adapter = preferenceScreen.getRootAdapter();
for(int i = 0; i < preferenceScreen.getRootAdapter().getCount(); i++)
{
//attention to type and key
Preference pref = (Preference) adapter.getItem(i);
if (pref == null || pref.getKey() == null)
continue;
if (pref.getKey().equals(getString(R.string.tag_preference_key_always_zoom_to_akt_position)))
cb1 = (CheckBoxPreference) pref;
if (pref.getKey().equals(getString(R.string.tag_preference_key_always_zoom_to_last_location)))
cb2 = (CheckBoxPreference) pref;
if (cb1 != null && cb2 != null)
break;
}
//be safe
if (cb1 == null || cb2 == null)
return super.onPreferenceTreeClick(preferenceScreen, preference);
if (preference.getKey().equals(getString(R.string.tag_preference_key_always_zoom_to_akt_position))) {
CheckBoxPreference cb = (CheckBoxPreference) preference;
cb2.setChecked(!cb.isChecked());
}
if (preference.getKey().equals(getString(R.string.tag_preference_key_always_zoom_to_last_location))) {
CheckBoxPreference cb = (CheckBoxPreference) preference;
cb1.setChecked(!cb.isChecked());
}
return super.onPreferenceTreeClick(preferenceScreen, preference);
}
https://stackoverflow.com/questions/4966816
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