[Update: Back in Beta 5] Android Q Beta 3 adds developer option that forces dark mode on all apps

• Update 1: 2019/06/06 12:13pm PDT
  This feature is partly broken as of Q Beta 4. Trying to enable the setting in developer options merely results in a crash, booting you back out as the setting
• Update 2: 2019/07/11 4:32am PDT
  The force dark mode option works again on Android Q Beta 5 and no longer crashes when enabled. 9to5Google also reports that it doesn't affect some Google apps anymore,

Google has officially announced dark mode for Android Q at I/O and has updated the Material Guidelines telling developers how to properly implement the theme in their apps.

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[Update: Back in Beta 5] Android Q Beta 3 adds developer option that forces dark mode on all apps was written by the awesome team at Android Police.

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