Android 11 SystemUI(状态/导航栏)-状态栏下拉时图标的隐藏与通知面板的半透黑色背景

概述

本文续自:Android 11 的状态栏的隐藏

PS
本文虽然同属于SystemUI, 但目前并 没有 打算整理成专橍或撰写一个系列的想法.
仅仅为了记录一些过程, 留下那些容易被遗忘的点滴.

开始下拉时状态栏图标被隐藏

   状态橍的图标在用户开始触摸(ACTION_DOWN)后, 会开始展开, 显示扩展面板, 同时, 隐藏状态橍上的通知和状态图标. 在手机上表现有可能不同, 在android 13上, 在点击没有作用, 只有下拉一定的距离,才会开始隐藏.

隐藏从触摸下按开始, 参照下图:

忽略过程代码, 直接上最后一部分:

frameworks/base/packages/SystemUI//src/com/android/systemui/statusbar/phone/CollapsedStatusBarFragment.java

    @Override
    public void disable(int displayId, int state1, int state2, boolean animate) {
        if (displayId != getContext().getDisplayId()) {
            return;
        }
        state1 = adjustDisableFlags(state1);
        final int old1 = mDisabled1;
        final int diff1 = state1 ^ old1;
        mDisabled1 = state1;
        if ((diff1 & DISABLE_SYSTEM_INFO) != 0) {
            if ((state1 & DISABLE_SYSTEM_INFO) != 0) {
                hideSystemIconArea(animate);
                hideOperatorName(animate);
            } else {
                showSystemIconArea(animate);
                showOperatorName(animate);
            }
        }
        if ((diff1 & DISABLE_NOTIFICATION_ICONS) != 0) {
            if ((state1 & DISABLE_NOTIFICATION_ICONS) != 0) {
                hideNotificationIconArea(animate);
            } else {
                showNotificationIconArea(animate);
            }
        }
        // The clock may have already been hidden, but we might want to shift its
        // visibility to GONE from INVISIBLE or vice versa
        if ((diff1 & DISABLE_CLOCK) != 0 || mClockView.getVisibility() != clockHiddenMode()) {
            if ((state1 & DISABLE_CLOCK) != 0) {
                hideClock(animate);
            } else {
                showClock(animate);
            }
        }
    }
    protected int adjustDisableFlags(int state) {
        boolean headsUpVisible = mStatusBarComponent.headsUpShouldBeVisible();
        if (headsUpVisible) {
            state |= DISABLE_CLOCK;
        }

        if (!mKeyguardStateController.isLaunchTransitionFadingAway()
                && !mKeyguardStateController.isKeyguardFadingAway()
                && shouldHideNotificationIcons()
                && !(mStatusBarStateController.getState() == StatusBarState.KEYGUARD
                        && headsUpVisible)) {
            state |= DISABLE_NOTIFICATION_ICONS;
            state |= DISABLE_SYSTEM_INFO;
            state |= DISABLE_CLOCK;
        }


        if (mNetworkController != null && EncryptionHelper.IS_DATA_ENCRYPTED) {
            if (mNetworkController.hasEmergencyCryptKeeperText()) {
                state |= DISABLE_NOTIFICATION_ICONS;
            }
            if (!mNetworkController.isRadioOn()) {
                state |= DISABLE_SYSTEM_INFO;
            }
        }

        // The shelf will be hidden when dozing with a custom clock, we must show notification
        // icons in this occasion.
        if (mStatusBarStateController.isDozing()
                && mStatusBarComponent.getPanelController().hasCustomClock()) {
            state |= DISABLE_CLOCK | DISABLE_SYSTEM_INFO;
        }

        return state;
    }

关于CollapsedStatusBarFragment

    在读到CollapsedStatusBarFragment相关代码的时候, 一时没办法把Fragment与SystemUI串联起来, 这源于传统Fragment的使用习惯: 在Activity中, 获取一个FragmentManager, 创建各种Fragment, 调用replace, show, hide…
 
    难道SystemUI也吃这一套? 状态栏和导航栏不一直是通过WindowManager.addView()直接往里面丢的么!
 
    CollapsedStatusBarFragment 本身没什么特别的, 它只是一个android.app.Fragment, 没有特殊的地方, 特殊的是FragmentController, 它与传统的Fragment使用方法完全不同, 参考 frameworks/base/packages/SystemUI/src/com/android/systemui/fragments/FragmentHostManager.java
编写一段测试代码, 以便更直观了解它的用法:

public class TestActivity extends Activity{
	void testFragmentController(Context ctx, Handler h, int winAnim){
		if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
			FragmentController fragCtrl = FragmentController.createController(new FragmentHostCallback<Object>(ctx, h, 0) {
				@Override
				public Object onGetHost() {
					return null;
				}

				@Override
				public <T extends View> T onFindViewById(int id) {
					return findViewById(id);
				}
			});
			//java.lang.IllegalStateException: Activity has been destroyed
			//    at android.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1913)
			fragCtrl.attachHost(null);
			fragCtrl.dispatchCreate();
			fragCtrl.dispatchStart();
			fragCtrl.dispatchResume();

			//java.lang.IllegalArgumentException: No view found for id 0x7f08007c (com.android.factorytest:id/flRoot) for fragment SimpleFragment{2b5da47 #0 id=0x7f08007c}
			fragCtrl.getFragmentManager()
					.beginTransaction()
					.replace(R.id.flRoot, new SimpleFragment())
					.commit();
		}
	}

	public static class SimpleFragment extends Fragment{
		@Override
		public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
			TextView tv = new TextView(getActivity());
			tv.setLayoutParams(new ViewGroup.LayoutParams(UiTools.MATCH_PARENT, UiTools.MATCH_PARENT));
			tv.setText("FragmentController");
			tv.setTextSize(36);
			return tv;
		}
	}
}

重点关注代码中的createController和FragmentHostCallback, 当创建完成后, 便可以通过 FragmentController的getFragmentManager获取FragmentManager, 接下来就是熟悉的操作, 不多描述.

 

下拉通知黑色背景

    在下拉通知面板的过程中, 存在两部分的半透明背景, 第一部分(上)比较明显, 第二部分比较隐藏晦.
效果如下图:


这是一个自定义的View, 从layout文件中可以找到它: ScrimView

frameworks/base/packages/SystemUI/res/layout/super_notification_shade.xml

<com.android.systemui.statusbar.phone.NotificationShadeWindowView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:sysui="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">
    <!-- 省略代码 -->
    <com.android.systemui.statusbar.ScrimView
        android:id="@+id/scrim_behind"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:importantForAccessibility="no"
        sysui:ignoreRightInset="true"
        />

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/ScrimView.java

diff --git a/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/ScrimView.java b/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/ScrimView.java
index 7f30009cda..907d58c267 100644
--- a/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/ScrimView.java
+++ b/frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/ScrimView.java
@@ -69,7 +69,7 @@ public class ScrimView extends View {
 
     @Override
     protected void onDraw(Canvas canvas) {
-        if (mDrawable.getAlpha() > 0) {
+        if (false && mDrawable.getAlpha() > 0) {//强制不进行绘制, 就不会出现半透明背景
             mDrawable.draw(canvas);
         }
     }

第二部分只有在下拉到底部时才会出现(不仔细分辨很难看出来):

同样, 来自另一个自定义控件:AlphaOptimizedView

frameworks\base\packages\SystemUI\res\layout\status_bar_expanded.xml

    <com.android.systemui.statusbar.AlphaOptimizedView
        android:id="@+id/qs_navbar_scrim"
        android:layout_height="66dp"
        android:layout_width="match_parent"
        android:layout_gravity="bottom"
        android:visibility="invisible"
        android:background="@drawable/qs_navbar_scrim" />

扩展

Dagger, 绕得脑壳疼, 记录下out下的路径

out/soong/.intermediates/frameworks/base/packages/SystemUI/SystemUI-core/android_common/kapt/gen/sources/com/android/systemui/dagger/DaggerSystemUIRootComponent.java

public final class DaggerSystemUIRootComponent implements SystemUIRootComponent {

  private Provider<SystemUIRootComponent> systemUIRootComponentProvider;
    this.systemUIRootComponentProvider = InstanceFactory.create((SystemUIRootComponent) this);
    
  private Provider<FragmentService> fragmentServiceProvider;
 this.fragmentServiceProvider =
        DoubleCheck.provider(
            FragmentService_Factory.create(
                systemUIRootComponentProvider, provideConfigurationControllerProvider));
}

frameworks/base/packages/SystemUI/src/com/android/systemui/SystemUIAppComponentFactory.java

    @NonNull
    @Override
    public Application instantiateApplicationCompat(
            @NonNull ClassLoader cl, @NonNull String className)
            throws InstantiationException, IllegalAccessException, ClassNotFoundException {
        Application app = super.instantiateApplicationCompat(cl, className);
        if (app instanceof ContextInitializer) {
            ((ContextInitializer) app).setContextAvailableCallback(
                    context -> {
                        SystemUIFactory.createFromConfig(context);
                        SystemUIFactory.getInstance().getRootComponent().inject(
                                SystemUIAppComponentFactory.this);
                    }
            );
        }

        return app;
    }

frameworks/base/packages/SystemUI/src/com/android/systemui/SystemUIFactory.java

    private void init(Context context) {
        mRootComponent = buildSystemUIRootComponent(context);

        // Every other part of our codebase currently relies on Dependency, so we
        // really need to ensure the Dependency gets initialized early on.

        Dependency dependency = new Dependency();
        mRootComponent.createDependency().createSystemUI(dependency);
        dependency.start();
    }

    public static void createFromConfig(Context context) {
        if (mFactory != null) {
            return;
        }

        final String clsName = context.getString(R.string.config_systemUIFactoryComponent);
        if (clsName == null || clsName.length() == 0) {
            throw new RuntimeException("No SystemUIFactory component configured");
        }

        try {
            Class<?> cls = null;
            cls = context.getClassLoader().loadClass(clsName);
            mFactory = (SystemUIFactory) cls.newInstance();
            mFactory.init(context);
        } catch (Throwable t) {
            Log.w(TAG, "Error creating SystemUIFactory component: " + clsName, t);
            throw new RuntimeException(t);
        }
    }

frameworks/base/packages/SystemUI/src/com/android/systemui/Dependency.java

    @Inject Lazy<FragmentService> mFragmentService;
        protected void start() {
        	mProviders.put(FragmentService.class, mFragmentService::get);
        }

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java

FragmentHostManager.get(mPhoneStatusBarWindow)

frameworks/base/packages/SystemUI/src/com/android/systemui/fragments/FragmentHostManager.java

    public static FragmentHostManager get(View view) {
        try {
            return Dependency.get(FragmentService.class).getFragmentHostManager(view);
        } catch (ClassCastException e) {
            // TODO: Some auto handling here?
            throw e;
        }
    }

frameworks/base/packages/SystemUI/src/com/android/systemui/fragments/FragmentService.java

    public FragmentHostManager getFragmentHostManager(View view) {
        View root = view.getRootView();
        FragmentHostState state = mHosts.get(root);
        if (state == null) {
            state = new FragmentHostState(root);
            mHosts.put(root, state);
        }
        return state.getFragmentHostManager();
    }

参考

SystemUI源码分析之PhoneStatusBar初始化布局简单分析
Android SystemUI 状态栏网络图标显示分析Android 11
SystemUI之状态图标控制
Android 8.0 SystemUI三一说顶部 StatusBar
Android 8.0 SystemUI四二说顶部 StatusBar
Dagger 基础知识
在 Android 应用中使用 Dagger