android Backspace how to achieve

            
Each one has a text input box, type a lot of character, I click backspace button to delete a character.
Now you want is to click backspace to delete the character in front of the cursor; when the character is also re-entered input before the cursor; when the first input, the cursor backward.
Ask, how does this implementation
Reply:
Seek expert answer Yeah,,,
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= Pending. .
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Landlord solved? With seeking ah
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My question is how the landlord point backspace to delete characters