Android N 设置源码分析_n设置-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_27256793/article/details/87430976

本文深入探讨了Android N中Settings应用的实现细节，包括主界面的布局与数据来源、侧滑菜单的实现以及Settings中的Suggestion功能。重点分析了SettingsActivity、DashboardContainerFragment和DashboardAdapter的工作原理，同时介绍了Suggestion的显示逻辑和配置。参考了多个相关博客以提供更全面的理解。

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Settings的主界面

frameworks/base/packages/SettingsLib/res/layout/settings_with_drawer.xml

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="?android:attr/colorPrimaryDark">
    <!-- 设置主界面 -->
    <LinearLayout
        android:id="@+id/content_parent"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:fitsSystemWindows="true" >
        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            style="?android:attr/actionBarStyle">
            <Toolbar
                xmlns:android="http://schemas.android.com/apk/res/android"
                android:id="@+id/action_bar"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:navigationContentDescription="@*android:string/action_bar_up_description"
                android:theme="?android:attr/actionBarTheme"
                style="?android:attr/toolbarStyle"
                android:background="?android:attr/colorPrimary" />
        </FrameLayout>
        <FrameLayout
            android:id="@+id/content_header_container"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            style="?android:attr/actionBarStyle" />
        <FrameLayout
            android:id="@+id/content_frame"
            android:layout_width="match_parent"
            android:layout_height="fill_parent"
            android:background="?android:attr/windowBackground" />
    </LinearLayout>
    <!-- 侧拉抽屉 -->
    <ListView android:id="@+id/left_drawer"
        android:layout_width="300dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:choiceMode="singleChoice"
        android:divider="@android:color/transparent"
        android:dividerHeight="0dp"
        android:background="?android:attr/colorBackground" />
    </android.support.v4.widget.DrawerLayout>

在这里插入图片描述
frameworks/base/packages/SettingsLib/src/com/android/settingslib/drawer/SettingsDrawerActivity.java
frameworks/base/packages/SettingsLib/src/com/android/settingslib/drawer/SettingsDrawerAdapter.java

设置的主界面入口：SettingsActivity.java是SettingsDrawerActivity.java的子类

packages/apps/Settings/src/com/android/settings/SettingsActivity.java
    @Override
    protected void onCreate(Bundle savedState) {
        super.onCreate(savedState);

        ...
        //加载了一个R.layout.settings_main_dashboard
        setContentView(mIsShowingDashboard ?
                R.layout.settings_main_dashboard : R.layout.settings_main_prefs);加载主界面，为一个fragment

        mContent = (ViewGroup) findViewById(R.id.main_content);

        getFragmentManager().addOnBackStackChangedListener(this);


        if (savedState != ) {
            // We are restarting from a previous saved state; used that to initialize, instead
            // of starting fresh.
            mSearchMenuItemExpanded = savedState.getBoolean(SAVE_KEY_SEARCH_MENU_EXPANDED);
            mSearchQuery = savedState.getString(SAVE_KEY_SEARCH_QUERY);
            setTitleFromIntent(intent);

            ArrayList<DashboardCategory> categories =
                    savedState.getParcelableArrayList(SAVE_KEY_CATEGORIES);
            if (categories != ) {
                mCategories.clear();
                mCategories.addAll(categories);
                setTitleFromBackStack();
            }

            mDisplayHomeAsUpEnabled = savedState.getBoolean(SAVE_KEY_SHOW_HOME_AS_UP);
            mDisplaySearch = savedState.getBoolean(SAVE_KEY_SHOW_SEARCH);

        } else {
            if (!mIsShowingDashboard) {
                mDisplaySearch = false;
                // UP will be shown only if it is a sub settings
                if (mIsShortcut) {
                    mDisplayHomeAsUpEnabled = isSubSettings;
                } else if (isSubSettings) {
                    mDisplayHomeAsUpEnabled = true;
                } else {
                    mDisplayHomeAsUpEnabled = false;
                }
                setTitleFromIntent(intent);

                Bundle initialArguments = intent.getBundleExtra(EXTRA_SHOW_FRAGMENT_ARGUMENTS);
                switchToFragment(initialFragmentName, initialArguments, true, false,
                        mInitialTitleResId, mInitialTitle, false);
            } else {
                // No UP affordance if we are displaying the main Dashboard
                mDisplayHomeAsUpEnabled = false;
                // Show Search affordance
                mDisplaySearch = true;
                mInitialTitleResId = R.string.dashboard_title;

                // add argument to indicate which settings tab should be initially selected
                final Bundle args = new