Preferences - (3) Preference Fragment 만들기

Preferences2.zip

0. Result

1. Add the gradle dependency for the support preference fragment

app/build.gradle

dependencies {
    compile 'com.android.support:preference-v7:26.1.0'
}

2. Create the pref_settings in res/xml and

   Add a CheckBoxPreference to the preference

values/strings.xml

<resources>
   
    <!-- Label for the show text1 checkbox preference -->
    <string name="pref_show_text1_label">Show Text1</string>
    <!-- Key name for storing text1 in SharedPreferences -->
    <string name="pref_show_text1_key" translatable="false">show_text1</string>
    <!-- Label for the show text2 checkbox preference -->
    <string name="pref_show_text2_label">Show Text2</string>
    <!-- Key name for storing text2 in SharedPreferences -->
    <string name="pref_show_text2_key" translatable="false">show_text2</string>
 
    <!-- Summary for Checkboxes -->
    <string name="pref_show_true">Shown</string>
    <string name="pref_show_false">Hidden</string>
</resources>
 

values/bools.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <bool name="pref_show_text1_default">true</bool>
    <bool name="pref_show_text2_default">false</bool>
</resources>

xml/pref_settings

<?xml version="1.0" encoding="utf-8"?>
<!-- 계층적인 구조를 만들고 싶을 경우, preferenceScreen 태그 안에
     preferenceScreen 태그를 중복해서 사용하면 된다.-->
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- defaultValue: 기본적으로 설정할 값
         summary: 체크박스가 어떤 역할을 하는지 유저에게 설명한다.
         여기선 summaryOn 일때 보이게, summaryOff 일때 안보이게 설정 -->
    <CheckBoxPreference
        android:defaultValue="@bool/pref_show_text1_default"
        android:key="@string/pref_show_text1_key"
        android:summaryOff="@string/pref_show_false"
        android:summaryOn="@string/pref_show_true"
        android:title="@string/pref_show_text1_label" />
 
    <CheckBoxPreference
        android:defaultValue="@bool/pref_show_text2_default"
        android:key="@string/pref_show_text2_key"
        android:summaryOff="@string/pref_show_false"
        android:summaryOn="@string/pref_show_true"
        android:title="@string/pref_show_text2_label" />
 
</PreferenceScreen>

3. Create the SettingsFragment class that extends PreferencesFragmentCompat and

    Call add PreferencesFromResource method to add the preference file

SettingsFragment.java

package com.tistory.qlyh8.preferences;
 
/*
 * Created by YUNHEE on 2018-01-03.
 */
 
import android.os.Bundle;
import android.support.v7.preference.PreferenceFragmentCompat;
 
public class SettingsFragment extends PreferenceFragmentCompat {
 
    @Override
    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
        addPreferencesFromResource(R.xml.pref_settings);
    }
}
 

4.  Set the root layout of activity_settings to the newly created SettingsFragment

layout/activity_settings.xml

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_settings"
    android:name="com.tistory.qlyh8.preferences.SettingsFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

5. Add a preference theme to styles.xml

values/styles.xml

<!-- PreferenceFragmentCompat 라이브러리를 사용하기 때문에 추가 -->
<item name="preferenceTheme">@style/PreferenceThemeOverlay</item>

Android Course of Udacity - Lesson 6