The Matrix questions

• How to know screen on time since last battery charge or reboot in Android?
• Actionbar in Android 15 is overlapping activity contents
• Java File.lastModified returned value changes if timezone changes?
• Detect when wearable connected/disconnected to/from Android phone
• How to use PackageManager canRequestPackageInstalls in Android Oreo?
• Intent to open the Notification Channel settings from my app
• java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v4/os/BuildCompat

The Matrix answers