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Android系统SetttingAPP源码分析：
5.1之前的setting版本:平板布局是，左边为header,右边是关联Prefenrence的Fragment
5.1Setting系统应用源码分析：
入口Settings.java(空实现)
===》父类SettingActivity.java，onCreate()中setContentView(R.layout.settings_main_dashboard) ===》settings_main_dashboard中只有一个帧布局，id为main_content用于Fragment的切换 ===》onCreate中继续查看，发现switchToFragment(DashboardSummary.class.getName(), xxx,xx) ===》接着查看DashboardSummary.java,此继承Fragment ===》视图为View rootView = inflater.inflate(R.layout.dashboard, xxx,xx) 可滑动的垂直线性布局，用于存放header ===》rebuildUI(context) ===》DashboardSummary向SettingsActivity拿数据更新UI，((SettingsActivity) context).getDashboardCategories(true); ===》接着看看SettingsActivity怎么拿数据 ===》List<DashboardCategory> getDashboardCategories(boolean forceRefresh) ===》buildDashboardCategories(List<DashboardCategory> categories) ===》loadCategoriesFromResource(R.xml.dashboard_categories, categories) ===》找到dashboard_categories.xml ===》查看组标签<dashboard-categories>和成员标签<dashboard-tile>
以显示为例： <!-- Display --> <dashboard-tile android:id="@+id/display_settings" android:title="@string/display_settings" android:fragment="com.android.settings.DisplaySettings" android:icon="@drawable/ic_settings_display"/>
===》可见比较关心的是fragment="com.android.settings.DisplaySettings"属性 ===》查看DisplaySettings ===》DisplaySettings继承SettingsPreferenceFragment并实现Preference.OnPreferenceChangeListener,OnPreferenceClickListener,Indexable ===》onCreate中有 addPreferencesFromResource(R.xml.display_settings); ===》找到display_settings.xml,其跟标签<PreferenceScreen> ,子标签有很多类型<XxxPreference> 以自动亮度调节开关为例： <SwitchPreference android:key="auto_brightness" android:title="自动调节亮度" settings:keywords="变暗 调暗 屏幕 触摸屏 电池" android:summary="根据环境光线情况优化亮度" android:persistent="false" /> ===》可见关键还是这个key属性 ===》查看DisplaySettings.java代码中有private static final String KEY_AUTO_BRIGHTNESS = "auto_brightness"; ===》在onCreate中发现此代码： if (isAutomaticBrightnessAvailable(getResources())) { mAutoBrightnessPreference = (SwitchPreference) findPreference(KEY_AUTO_BRIGHTNESS); mAutoBrightnessPreference.setOnPreferenceChangeListener(this); } else { removePreference(KEY_AUTO_BRIGHTNESS); } ===》可见对此开关设置了监听回调 其回调方法为：public boolean onPreferenceChange(Preference preference, Object objValue) ===》回调中处理开关逻辑： if (preference == mAutoBrightnessPreference) { boolean auto = (Boolean) objValue; Settings.System.putInt(getContentResolver(), SCREEN_BRIGHTNESS_MODE, auto ? SCREEN_BRIGHTNESS_MODE_AUTOMATIC : SCREEN_BRIGHTNESS_MODE_MANUAL); } ====================end=============================================================================
参考博客： https://blog.csdn.net/wangjinyu501/article/details/22077803
https://blog.csdn.net/szqsdq/article/details/52537281
https://www.jianshu.com/p/691b2ad46e62
https://blog.csdn.net/wlwl0071986/article/details/47805163?utm_source=blogkpcl13
https://blog.csdn.net/u013921245/article/details/50607460?utm_source=blogxgwz0
