Use android adb shell to return one activity -

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I have the following problem:

Our company has built an Android device that has no return There is no button (not physical and not under the screen), so I can not return to the previous activity / screen. Now I need to test the app developed by a third-party, when I return to the previous screen. Settings

Either way I can return to the previous screen or the user can click on the return button?

I had to go back to HOME (Android main screen): 

  ADB shell is starting- A androidintent. Action. Mn-c androidintent Category.HOME

Also read about Activity Manager and Expirer Monkey at these links:

But This is not able to solve my problem. How can anyone complete this call through ADB?

You can try: 

  ADB Shell input keywidth keycode_back

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