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Split ConditionManager into API-specific versions

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* On API 29+ we need the location permission to start the hotspot, while
  on lower API levels, we don't. In order to handle permissions and
  other conditions in a clear manner depending the API level of the
  device the app is running on, have separate extensions of the base
  ConditionManager class.
* Take special care to handle situations gracefully where the Wifi is
  disabled and the user tries to start the hotspot. We cannot simply
  rely on Wifi being enabled as a sufficient condition that allows us to
  start the hotspot. We need to wait for WifiP2p to be available. While
  it is tricky to obtain that state (it involves registering a broadcast
  receiver for the WIFI_P2P_STATE_CHANGED_ACTION broadcast, keeping
  track of changes there and even then things are still ugly. It can
  happen that WifiP2p is available *before* Wifi is. Also it can happen
  that WifiP2p never becomes available because some other application
  has already opened a hotspot. Instead of checking that state, we now
  just try (and retry repeatedly after a delay) to start the hotspot
  (and the WifiP2p framework) hoping that is becomes availabe within a
  reasonable amount of time after Wifi has been detected to be on.
  Currently we try 5 times with a delay of 1 second.
* Improve the behavior of disabling and re-enabling the 'start hotspot'
  button, so that it becomes impossible to double-tap it, but still
  making sure that the button get re-enabled as soon as the UI is back
  in a state where the user should be able to tap the button again.
This commit is contained in:
Sebastian Kürten
2021-07-21 11:34:31 +02:00
parent 806fce8c34
commit 355c487ec9
8 changed files with 375 additions and 197 deletions
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1
briar-android/src/main/res/values/strings.xml
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@@ -757,6 +757,7 @@
<string name="hotspot_error_web_server_start">Error starting web server!</string>
<string name="hotspot_error_web_server_serve">Error presenting website.\n\nPlease send feedback (with anonymous data) via the Briar app if the issue persists.</string>
<string name="hotspot_flag_test">Warning: This app was installed with Android Studio and can NOT be installed on another device.</string>
<string name="hotspot_error_framework_busy">Unable to start the hotspot. If you have another hotspot running or are sharing your internet connection via Wifi, try stopping that and try again afterwards.</string>
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