Solution to failure to capture back key after Android pops up dialog
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Android
1、 Demand
During Android development, the back button cannot be captured after the dialog pops up, and there is no response when clicking the back button.
2、 Solution
Cause: after the dialog pops up, the activity loses focus and the dialog gets the current focus.
Solution: in the dialog, you can call setonkeylistener() method to add key event listening for the dialog.
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