之前写过一遍6.0的导航栏屏蔽分析过程，可参考Android6.0 源码修改之屏蔽导航栏虚拟按键（Home和RecentAPP）/动态显示和隐藏NavigationBar

屏蔽状态栏下拉

6.0解决办法

源码位置 SystemUI\src\com\android\systemui\statusbar\phone\PhoneStatusBarView.java

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        boolean barConsumedEvent = mBar.interceptTouchEvent(event);
        if (DEBUG_GESTURES) {
            if (event.getActionMasked() != MotionEvent.ACTION_MOVE) {
                EventLog.writeEvent(EventLogTags.SYSUI_PANELBAR_TOUCH,
                        event.getActionMasked(), (int) event.getX(), (int) event.getY(),
                        barConsumedEvent ? 1 : 0);
            }
        }
        // return barConsumedEvent || super.onTouchEvent(event);
    return false;
    }

直接返回false，action_move不会执行，代码看似简单，实则super.onTouchEvent(event)调用的是PanelBar.java中的onTouchEvent()

8.1解决办法（同上）

6.0和8.1的状态栏代码是有差异的，但是通过上面的方法都能达到需求效果

6.0的PhoneStatusBarView调用onTouchEvent()，最终调用PanelBar的onTouchEvent()

8.1的PhoneStatusBarView调用onTouchEvent()，接着调用PanelBar的onTouchEvent()，最终调用PanelView的onTouchEvent()

从根本上阻止事件的传递来达到屏蔽下拉的效果

补充

如果需要动态的控制是否允许下拉状态栏，可以通过广播通知，接受传递的参数，持久化保存(可通过SharedPreference或者Settings.Global.xxxx)当前状态栏的状态，一般建议采用Settings.Global保存。

具体步骤

在frameworks\base\core\java\android\provider\Settings.java中Globel内部类下添加变量名称，比如OPEN_PANEL_ENABLED
通过make update-api指令重新编译，因为在Settings中修改后需要编译才能对应到这两文件frameworks/base/api/system-current.txt、frameworks/base/api/current.txt
在广播接收的地方通过Settings.Global.putInt(context.getContentResolver(), Settings.Global.OPEN_PANEL_ENABLED, 1) 保存值
（ps 可通过adb命令 adb shell settings put global open_panel_enabled 1 模拟写入 adb shell settings get global open_panel_enabled 模拟查看）
将刚刚的return false改成

boolean flag=Settings.Global.getInt(getContext().getContentResolver(), Settings.Global.OPEN_PANEL_ENABLED,1)==1;
return flag ? barConsumedEvent || super.onTouchEvent(event) : flag;

屏蔽导航栏显示

6.0解决办法

源码位置SystemUI\src\com\android\systemui\statusbar\phone\PhoneStatusBar.java

    @Override
    public void start() {
        mDisplay = ((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE))
                .getDefaultDisplay();
        updateDisplaySize();
        mScrimSrcModeEnabled = mContext.getResources().getBoolean(
                R.bool.config_status_bar_scrim_behind_use_src);
        super.start(); // calls createAndAddWindows()
        mMediaSessionManager
                = (MediaSessionManager) mContext.getSystemService(Context.MEDIA_SESSION_SERVICE);
        // TODO: use MediaSessionManager.SessionListener to hook us up to future updates
        // in session state
         addNavigationBar();
     .....
    }

直接注释addNavigationBar()就能达到需求效果

8.1解决办法

源码位置SystemUI\src\com\android\systemui\statusbar\phone\StatusBar.java

    protected void makeStatusBarView() {
        final Context context = mContext;
        updateDisplaySize(); // populates mDisplayMetrics
        updateResources();
        updateTheme();
        ....
        try {
            boolean showNav = mWindowManagerService.hasNavigationBar();
            if (DEBUG) Log.v(TAG, "hasNavigationBar=" + showNav);
            if (showNav) {
                createNavigationBar();
            }
        } catch (RemoteException ex) {
            // no window manager? good luck with that
        }
        ....
    }

直接注释createNavigationBar()或者将showNav=false就能达到需求效果

代码流程分析

6.0和8.1的导航栏都是通过WindowManager的addView来添加的，通过WindowManager的removeViewImmediate来移除

1、6.0的addNavigationBar实现，通过addView将mNavigationBarView添加，prepareNavigationBarView方法设置了点击、触摸、长按事件，无需关心

  private void addNavigationBar() {
        if (DEBUG) Log.v(TAG, "addNavigationBar: about to add " + mNavigationBarView);
        if (mNavigationBarView == null) return;
        prepareNavigationBarView();
        mWindowManager.addView(mNavigationBarView, getNavigationBarLayoutParams());
        mNavigationShown=true;
    }

查找到在makeStatusBarView()中，mNavigationBarView初始化,加载navigation_bar布局文件

     protected PhoneStatusBarView makeStatusBarView() {
        final Context context = mContext;
        Resources res = context.getResources();
        updateDisplaySize(); // populates mDisplayMetrics
        updateResources();
    ...
    mNavigationBarView = (NavigationBarView) View.inflate(context, R.layout.navigation_bar, null);
        mNavigationBarView.setDisabledFlags(mDisabled1);
        mNavigationBarView.setBar(this);
        mNavigationBarView.setOnVerticalChangedListener(
                new NavigationBarView.OnVerticalChangedListener() {
            @Override
            public void onVerticalChanged(boolean isVertical) {
                if (mAssistManager != null) {
                    mAssistManager.onConfigurationChanged();
                }
                mNotificationPanel.setQsScrimEnabled(!isVertical);
            }
        });
        mNavigationBarView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                checkUserAutohide(v, event);
                return false;
            }});
  }

2、8.1的createNavigationBar实现，发现是通过NavigationBarFragment来实例化mNavigationBarView

    protected void createNavigationBar() {
        mNavigationBarView = NavigationBarFragment.create(mContext, (tag, fragment) -> {
            mNavigationBar = (NavigationBarFragment) fragment;
            if (mLightBarController != null) {
                mNavigationBar.setLightBarController(mLightBarController);
            }
            mNavigationBar.setCurrentSysuiVisibility(mSystemUiVisibility);
        });
    }

NavigationBarFragment的crate方法通过addView将mNavigationBarView添加，加载navigation_bar_window布局

    public static View create(Context context, FragmentListener listener) {
        WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
                LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT,
                WindowManager.LayoutParams.TYPE_NAVIGATION_BAR,
                WindowManager.LayoutParams.FLAG_TOUCHABLE_WHEN_WAKING
                        | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                        | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
                        | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH
                        | WindowManager.LayoutParams.FLAG_SPLIT_TOUCH
                        | WindowManager.LayoutParams.FLAG_SLIPPERY,
                PixelFormat.TRANSLUCENT);
        lp.token = new Binder();
        lp.setTitle("NavigationBar");
        lp.windowAnimations = 0;
        View navigationBarView = LayoutInflater.from(context).inflate(
                R.layout.navigation_bar_window, null);
        if (DEBUG) Log.v(TAG, "addNavigationBar: about to add " + navigationBarView);
        if (navigationBarView == null) return null;
        context.getSystemService(WindowManager.class).addView(navigationBarView, lp);
        FragmentHostManager fragmentHost = FragmentHostManager.get(navigationBarView);
        NavigationBarFragment fragment = new NavigationBarFragment();
        fragmentHost.getFragmentManager().beginTransaction()
                .replace(R.id.navigation_bar_frame, fragment, TAG)
                .commit();
        fragmentHost.addTagListener(TAG, listener);
        return navigationBarView;
    }

补充

依旧是通过广播来动态控制导航栏的显示和隐藏

6.0已在开头文章中写过，这里就只补充8.1的显示和隐藏

源码位置SystemUI\src\com\android\systemui\statusbar\phone\StatusBar.java

    private static final String SHOW_NAVIGATION = "cc.intent.systemui.shownavigation";
    private static final String HIDE_NAVIGATION = "cc.intent.systemui.hidenavigation";
   private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Log.e(TAG, "onReceive: " + intent);
            String action = intent.getAction();
            if (HIDE_NAVIGATION.equals(action)) {
                if (mNavigationBarView == null) return;
                mWindowManager.removeViewImmediate(mNavigationBarView);
                mNavigationBarView = null;
            }else if (SHOW_NAVIGATION.equals(action)) {
                if (mNavigationBarView != null) return;
                createNavigationBar();
            }
        }
    };

Android源码(6.0和8.1) 屏蔽状态栏下拉和屏蔽导航栏显示

屏蔽状态栏下拉

6.0解决办法

8.1解决办法（同上）

补充

屏蔽导航栏显示

6.0解决办法

8.1解决办法

代码流程分析

补充

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