1.概述

遇到需求，QuickQSPanel首次下拉后展示快捷功能模块以后就是显示QuickQSPanel，而不展开QSPanel，接下来要从下滑手势下拉出状态栏分析功能实现。也就是直接是展开状态。

2、涉及核心类

frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone

Android12或者Android13

frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\NotificationPanelViewController.java
frameworks/base/packages/SystemUI/res/layout/status_bar_expanded.xml


Android10
 
frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\NotificationPanelViewController.java
frameworks/base/packages/SystemUI/res/layout/status_bar_expanded.xml

3、修改

 private void setQsExpansion(float height) {

            // mQs  不等于空直接复用
            if (mQs != null) return;
            // mQs 等于空新建

        height = Math.min(Math.max(height, mQsMinExpansionHeight), mQsMaxExpansionHeight);
        mQsFullyExpanded = height == mQsMaxExpansionHeight && mQsMaxExpansionHeight != 0;
        if (height > mQsMinExpansionHeight && !mQsExpanded && !mStackScrollerOverscrolling
                && !mDozing) {
            setQsExpanded(true);
        } else if (height <= mQsMinExpansionHeight && mQsExpanded) {
            setQsExpanded(false);
        }
        mQsExpansionHeight = height;
        updateQsExpansion();
        requestScrollerTopPaddingUpdate(false /* animate */);
        updateHeaderKeyguardAlpha();
        if (mBarState == StatusBarState.SHADE_LOCKED || mBarState == KEYGUARD) {
            updateKeyguardBottomAreaAlpha();
            positionClockAndNotifications();
            updateBigClockAlpha();
        }

        if (mAccessibilityManager.isEnabled()) {
            mView.setAccessibilityPaneTitle(determineAccessibilityPaneTitle());
        }

        if (!mFalsingManager.isUnlockingDisabled() && mQsFullyExpanded
                && mFalsingCollector.shouldEnforceBouncer()) {
            mStatusBar.executeRunnableDismissingKeyguard(null, null /* cancelAction */,
                    false /* dismissShade */, true /* afterKeyguardGone */, false /* deferred */);
        }
        for (int i = 0; i < mExpansionListeners.size(); i++) {
            mExpansionListeners.get(i).onQsExpansionChanged(
                    mQsMaxExpansionHeight != 0 ? mQsExpansionHeight / mQsMaxExpansionHeight : 0);
        }
        if (DEBUG) {
            mView.invalidate();
        }
    }