触发onPreferenceClick时如何动态填充ListPreference？
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我有一个偏好活动，它的显示范围为ѭ1a0。可以在调用onCreate时填充列表，但是我想在用户单击列表时填充列表。
this is the java code
public class SettingsActivity extends PreferenceActivity implements OnPreferenceClickListener {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
try {
addPreferencesFromResource(R.xml.settings);
} catch (Exception e) {
}
}
@Override
public boolean onPreferenceClick(Preference preference) {
if((preference instanceof ListPreference) && (preference.getKey().equals(\"language\"))){
ListPreference lp = (ListPreference)preference;
CharSequence[] entries = { \"English\", \"French\" };
CharSequence[] entryValues = {\"1\" , \"2\"};
lp.setEntries(entries);
lp.setDefaultValue(\"1\");
lp.setEntryValues(entryValues);
return true;
}
return false;
}
}
settings.xml
<?xml version=\"1.0\" encoding=\"utf-8\"?>
<PreferenceScreen
xmlns:android=\"http://schemas.android.com/apk/res/android\">
<PreferenceCategory android:title=\"General Settings\">
<CheckBoxPreference android:key=\"enabled\" android:title=\"Application Status\" android:summary=\"Enable or disable the application\" />
<ListPreference
android:key=\"language\"
android:title=\"Language\"
android:dialogTitle=\"Application language\"
android:summary=\"Select the Application language\"
/>
</PreferenceCategory>
</PreferenceScreen>
没有找到相关结果
已邀请:
3 个回复
疮痪徘弦漏
和属性，或者以编程方式在中进行设置。 如果在初始化初始ListPreference对象之后需要动态更改列表中的项目，则需要将ѭ9直接附加到ListPreference对象。使用您在XML中指定的键来获取首选项的句柄。 由于填充和数组的代码必须同时在和中运行，因此有必要将其提取到单独的方法中，以避免重复。public class SettingsActivity extends PreferenceActivity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); try { addPreferencesFromResource(R.xml.settings); } catch (Exception e) { } final ListPreference listPreference = (ListPreference) findPreference(\"language\"); // THIS IS REQUIRED IF YOU DON\'T HAVE \'entries\' and \'entryValues\' in your XML setListPreferenceData(listPreference); listPreference.setOnPreferenceClickListener(new OnPreferenceClickListener() { @Override public boolean onPreferenceClick(Preference preference) { setListPreferenceData(listPreference); return false; } }); } protected static void setListPreferenceData(ListPreference lp) { CharSequence[] entries = { \"English\", \"French\" }; CharSequence[] entryValues = {\"1\" , \"2\"}; lp.setEntries(entries); lp.setDefaultValue(\"1\"); lp.setEntryValues(entryValues); } }茬贺努充尽
）来获取首选项的句柄。 由于填充和数组的代码必须同时在和中运行，因此有必要将其提取到单独的方法中，以避免重复。/** * This fragment shows data and sync preferences only. It is used when the * activity is showing a two-pane settings UI. */ @TargetApi(Build.VERSION_CODES.HONEYCOMB) public static class myCustomPreferenceFragment extends PreferenceFragment { final private String CUSTOM_LIST= \"custom_list\"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.pref_custom_frag); PreferenceCategory targetCategory = (PreferenceCategory) findPreference(\"CUSTOM_FRAG\"); final ListPreference lp = setListPreferenceData((ListPreference) findPreference(CUSTOM_LIST), getActivity()); lp.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() { @Override public boolean onPreferenceClick(Preference preference) { setListPreferenceData(lp, getActivity()); return false; } }); setHasOptionsMenu(true); targetCategory.addPreference(lp); bindPreferenceSummaryToValue(targetCategory); bindPreferenceSummaryToValue(lp); } protected ListPreference setListPreferenceData(ListPreference lp, Activity mActivity) { CharSequence[] entries = { \"One\", \"Two\", \"Three\" }; CharSequence[] entryValues = { \"1\", \"2\", \"3\" }; if(lp == null) lp = new ListPreference(mActivity); lp.setEntries(entries); lp.setDefaultValue(\"1\"); lp.setEntryValues(entryValues); lp.setTitle(\"Number Of blahs\"); lp.setSummary(lp.getEntry()); lp.setDialogTitle(\"Number of Blah objects\"); lp.setKey(CUSTOM_LIST); return lp; } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == android.R.id.home) { startActivity(new Intent(getActivity(), SettingsActivity.class)); return true; } return super.onOptionsItemSelected(item); } }<?xml version=\"1.0\" encoding=\"utf-8\"?> <PreferenceScreen xmlns:android=\"http://schemas.android.com/apk/res/android\"> <PreferenceCategory android:key=\"CUSTOM_FRAG\" android:title=\"Some Options\"> </PreferenceCategory> </PreferenceScreen>稀瓣囊
public class DListPref extends ListPreference { public interface LoadingListener { void setData(ListPreference lp); } LoadingListener TheLL; public void setLoadingListener(LoadingListener l) { TheLL = l; } @Override protected void onPrepareDialogBuilder(AlertDialog.Builder builder) { if(TheLL!=null) { TheLL.setData(this); } super.onPrepareDialogBuilder(builder); } //Do not mind the rest of this class, as they are auto-generated boilerplate code. public DListPref(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); } public DListPref(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } public DListPref(Context context, AttributeSet attrs) { super(context, attrs); } public DListPref(Context context) { super(context); } }<my.company.DListPref android:defaultValue=\"-1\" android:key=\"damn\" android:title=\"vegetables\"/>DListPref lp = (DListPref) findPreference(\"damn\"); lp.setLoadingListener(new DListPref.LoadingListener() { @Override public void setData(ListPreference lp) { lp.setEntries(new String[]{\"doge\", \"wow\"}); lp.setEntryValues(new String[] {\"1\", \"2\"}); lp.setDefaultValue(\"1\"); } });