refactor: simplify Channel initialization and lambda expressions #2096

Job	Run time
Build (Unit-tests & Android-Lint)	1h 33m 6s
Android UI-tests on emulator (27, default)	6h 0m 5s
Android UI-tests on emulator (34, default)	9m 49s
Android UI-tests on emulator (29, default)	9m 45s
Android UI-tests on emulator (31, default)	9m 32s
Android UI-tests on emulator (33, default)	9m 24s
Android UI-tests on emulator (25, default)	12m 19s
Android UI-tests on emulator (32, default)	9m 46s
Android UI-tests on emulator (30, default)	9m 1s
Android UI-tests on emulator (24, default)	8m 53s
Android UI-tests on emulator (23, default)	9m 55s
Android UI-tests on emulator (36, default)	10m 52s
Android UI-tests on emulator (37, default)	48s
Android UI-tests on emulator (26, default)	1m 48s
Android UI-tests on emulator (35, default)	8m 32s
Android UI-tests on emulator (28, default)	8m 54s
	9h 32m 29s

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