0804-APP-Preference-default-values

最新推荐文章于 2025-11-29 22:04:11 发布

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本文展示如何为Android应用中的偏好设置（Preferences）定义默认值。通过XML配置文件，可以为CheckBoxPreference、EditTextPreference和ListPreference等元素指定初始状态或默认选项。

展示有默认值的Preferences,这个例子除了xmlt的没有什么特殊的

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2008 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->

<!-- This is a primitive example showing how to set default values for preferences.
     See DefaultValues.java for more information. -->
<PreferenceScreen
        xmlns:android="http://schemas.android.com/apk/res/android">

    <CheckBoxPreference
            android:key="default_toggle"
            android:defaultValue="true"
            android:title="@string/title_checkbox_preference"
            android:summary="@string/summary_checkbox_preference" />

    <EditTextPreference
            android:key="default_edittext"
            android:defaultValue="@string/default_value_edittext_preference"
            android:title="@string/title_edittext_preference"
            android:summary="@string/summary_edittext_preference"
            android:dialogTitle="@string/dialog_title_edittext_preference" />
            
    <ListPreference
            android:key="default_list"
            android:defaultValue="@string/default_value_list_preference"
            android:title="@string/title_list_preference"
            android:summary="@string/summary_list_preference"
            android:entries="@array/entries_list_preference"
            android:entryValues="@array/entryvalues_list_preference"
            android:dialogTitle="@string/dialog_title_list_preference" />

</PreferenceScreen>

注释：对于ListPreference来说default_value_list_preference是arry entryvalues_list_preference中的某一个值