Plyer android proximity sensor

[sumitmadhwani]

Proximity sensor api for android platform.

The work is based on #159 and I have done some additional changes to bring it in merge-able state.

Issue in the original pr - Once the proximity sensor is enabled, after covering the sensor, it should display yes meaning sensor has detected a object instead it was always displaying no irrespective of whether it is covered or not. Maybe this was due to not returning correct value by _get_proximity function.

I made the required changes and after that, the example is working something like this -
Initially

Just after pressing enable

After covering the top part of mobile where sensor is located

Additionally, rebasing is also done since the original pr is 117 commits behind master.

Tested on -
Devices - Xiaomi Mi 4i, Samsung Galaxy S6 Edge
Toolchain - old and new both
Android api - 19
Android sdk - 24

[dessant]

I think this will crash if the sensor is enabled and disabled then either enabled or disabled again.

class Test():
    prop = None


var = Test()
delattr(var, 'prop')
print(var.prop)

It may be better to just use self.listener = None.

[dessant]

Scratch that, i've made a mistake. 😋

Of course it works:

class Test():
    prop = None

    def set(self):
        self.prop = 1

    def delete(self):
        delattr(self, 'prop')


var = Test()
var.set()
var.delete()

print(var.prop)

[sumitmadhwani]

Thanks @dessant

[dessant]

@Malverick, thanks for the fixes. 👍