我需要在TextView中显示EditTextpreference(Settings Activity)的值,该值位于MainActivity的片段中。我已经尝试了几种解决方案,我的问题主要是保存所有活动都可以访问的变量中的值。我听说过两种方式:intent extras和SharedPreferences。问题是,在所有教程中我都看到TextView在MainActivity中,而不是它的片段,我尝试过的代码在那里不起作用。这是我的设置xml:
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<!--CheckBoxPreference
android:key="example_checkbox"
android:title="@string/pref_title_social_recommendations"
android:summary="@string/pref_description_social_recommendations"
android:defaultValue="true" /-->
<!-- NOTE: EditTextPreference accepts EditText attributes. -->
<!-- NOTE: EditTextPreference's summary should be set to its value by the activity code. -->
<EditTextPreference
android:key="example_text"
android:title="@string/pref_title_display_name"
android:defaultValue="@string/pref_default_display_name"
android:selectAllOnFocus="true"
android:inputType="textCapWords"
android:capitalize="words"
android:singleLine="true"
android:maxLines="1"
android:maxLength="25" />
<!-- NOTE: Hide buttons to simplify the UI. Users can touch outside the dialog to
dismiss it. -->
<!-- NOTE: ListPreference's summary should be set to its value by the activity code. -->
<ListPreference
android:key="example_list"
android:title="@string/pref_title_add_friends_to_messages"
android:defaultValue="5"
android:entries="@array/pref_example_list_titles"
android:entryValues="@array/pref_example_list_values"
android:negativeButtonText="@null"
android:positiveButtonText="@null" />
</PreferenceScreen>
这是我的MainActivity的片段部分:
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
LayoutInflater lf = getActivity().getLayoutInflater();
View rootView = lf.inflate(R.layout.fragment_frontpage, container, false);
TextView textView = (TextView) rootView.findViewById(R.id.NameView);
textView.setText("Test");
return rootView;
}
}
所以我的主要目标是创建一个变量,它保存了edittextpreference的值,然后在
中使用textView.setText(Variable here);
我如何实现这一目标?
答案 0 :(得分:1)
所有首选项值都存储在具有相应键的默认共享首选项文件中:
View rootView;
onCreateView(){
rootView=inflate(" inflate your view here");
return rootView;
}
onResume(){
TextView textView=(TextView)rootView.findViewById("your resource id here")
SharedPreference pref=PreferenceManager.getDefaultSharedPreference(getActivity());
String text=pref.getString("example_text","")
textView.setText(text);
}