Use demo mode when taking screenshots to clear status bar

https://android.googlesource.com/platform/frameworks/base/+/master/packages/SystemUI/docs/demo_mode.md

briar-android/fastlane/Fastfile

@@ -19,8 +19,10 @@ platform :android do
   desc "Takes screenshots for manual and Google Play"
   lane :screenshots do
     gradle(project_dir: "..", task: "assembleScreenshot assembleAndroidTest")
+    system './demo-mode-activate.sh'
     capture_android_screenshots
-	system './rename_screenshots.py'
+    system './demo-mode-deactivate.sh'
+    system './rename_screenshots.py'
   end
 end
 

briar-android/fastlane/demo-mode-activate.sh

+#!/usr/bin/env bash
+adb shell settings put global sysui_demo_allowed 1
+adb shell am broadcast -a com.android.systemui.demo -e command enter
+adb shell am broadcast -a com.android.systemui.demo -e command notifications -e visible false
+adb shell am broadcast -a com.android.systemui.demo -e command battery -e level 100
+adb shell am broadcast -a com.android.systemui.demo -e command network -e wifi show
+adb shell am broadcast -a com.android.systemui.demo -e command clock -e hhmm 1337
\ No newline at end of file

briar-android/fastlane/demo-mode-deactivate.sh

+#!/usr/bin/env bash
+adb shell am broadcast -a com.android.systemui.demo -e command exit
\ No newline at end of file