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BackHandler

Android-only API to listen to the hardware back button.

Methods​

exitApp​

exitApp: unit => unit

addEventListener​

addEventListener: ([#hardwareBackPress], unit => nullable<bool>) => {remove: unit => unit}

Return Nullable.make(true) from the handler to prevent the default back behavior.

React.useEffect0(() => {
  let subscription = BackHandler.addEventListener(#hardwareBackPress, () => {
    // handle back...
    Nullable.make(true)
  })
  Some(() => subscription.remove())
})