java 如何在 Android 中使用 PreferenceScreen

How to use PreferenceScreen in Android

提问by Dr.NoBody

i want use PreferenceScreenfor setting page, i know use EditTextPreferencesand use this text. but i don't know other Objects, for example : i don't know change text color from ListPreference, or i don't know show/hide text from CheckBoxPreference.

我想PreferenceScreen用于设置页面，我知道使用EditTextPreferences和使用此文本。但我不知道其他对象，例如：我不知道从 更改文本颜色ListPreference，或者我不知道从CheckBoxPreference.

Attention :Please do not negative. I searched on the internet but could not find an appropriate topic, So here's the question I asked. Please guide me instead of giving a negative rating!

注意：请不要否定。我在互联网上搜索但找不到合适的主题，所以这是我问的问题。请指导我而不是给负面评价！

Main Activity code :

主要活动代码：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_page);

    ///--- Setting Options
    summary_tv = (TextView) findViewById(R.id.main_summary_text);
    preferences = PreferenceManager.getDefaultSharedPreferences(this);
    String colors = "";
    String main_title_text = preferences.getString("setting_title_text", "main_title");
    summary_tv.setText(main_title_text);
    Boolean main_title_show = preferences.getBoolean("setting_title_show", true);

Preference Activity code :

偏好活动代码：

public class SettingPage extends PreferenceActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getFragmentManager().beginTransaction().replace(android.R.id.content, new MyPreferenceFragment()).commit();
    }

    public static class MyPreferenceFragment extends PreferenceFragment
    {
        @Override
        public void onCreate(final Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.setting_prefrences);
        }
    }
}

Preference XML code :

首选项 XML 代码：

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">

    <PreferenceCategory
        android:key="setting_title_title_category"
        android:title="Title options">

    <CheckBoxPreference
        android:id="@+id/setting_title_show_id"
        android:key="setting_title_show"
        android:title="Show Main Title"
        android:summary="Show/hide MainPage title" />

    <EditTextPreference
        android:key="setting_title_text"
        android:title="Set Main Title"
        android:summary="Change MainPage title"
        android:dialogTitle="Change Title"
        android:dialogMessage="Change title please..."/>

    </PreferenceCategory>

    <PreferenceCategory
        android:key="setting_title_font_category"
        android:title="Font options">

        <ListPreference
            android:key="setting_title_font_color"
            android:title="Title font colors"
            android:summary="Change title font colors"
            android:entries="@array/colors"
            android:entryValues="@array/colors"
            android:dialogTitle="Change font color" />

    </PreferenceCategory>

    <RingtonePreference
        android:title="tes"/>

</PreferenceScreen>

String XML code :

字符串 XML 代码：

<resources>
    <string name="app_name">1-MyTestDb Project</string>
    <string name="title_activity_settings">Settings</string>

    <string-array name="colors">

        <item>White</item>
        <item>Black</item>
        <item>Primary</item>

    </string-array>

</resources>

How can use this preferencesin java code. for example change TextViewcolor with ListPreference?

如何在java 代码中使用此首选项。例如改变颜色？TextViewListPreference

采纳答案by Zoran P

Use the following code:

使用以下代码：

public static class MyPreferenceFragment extends PreferenceFragment implements OnSharedPreferenceChangeListener
{
    @Override
    public void onCreate(final Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.setting_prefrences);
    }

    @Override
    protected void onResume() {
        super.onResume();
        getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
    }

    @Override
    protected void onPause() {
         super.onPause();
         getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
    }

    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key)
    {
        if (key.equals("setting_title_font_color"))
        {
            // get preference by key
            Preference pref = findPreference(key);
            // do your stuff here
        }
    }
}

To change the TextView color in activity you need to add the following code to your activity onCreate():

要更改活动中的 TextView 颜色，您需要将以下代码添加到您的活动 onCreate() 中：

String color = preferences.getString("setting_title_font_color", "White");
if (color.equals("White") {
    summary_tv.setTextColor(Color.WHITE);
} else if (color.equals("Black") {
    summary_tv.setTextColor(Color.BLACK);
} else {
    // default color
}

Note: the color will be changed only when activity is first created. If you wish to update color while activity is running, then put this code in onResume() method.

注意：只有在首次创建活动时才会更改颜色。如果您希望在活动运行时更新颜色，请将此代码放在 onResume() 方法中。