How can I check the length of the input string in edittext?

I heard that textwatch can be used to listen to the length of the string entered in edittext, but I don't know how to use it. Hope someone else can give me some advice. Public void oncreate (bundle savedinstancestate ){ Super. oncreate (savedinstancestate ); Setcontentview (R. layout. Main ); MTV = (textview) findviewbyid (R. Id. TV ); Met = (edittext) findviewbyid (R. Id. Et ); Met. addtextchangedlistener (New textwatcher (){ @ Override Public void beforetextchanged (charsequence S, int start, int count, int after ){ } @ Override Public void ontextchanged (charsequence S, int start, int before, int count ){ MTV. settext (s ); } @ Override Public void aftertextchanged (editable s ){ } }); } This code can only get the input content in edittext, but how can we get the length of the input string?

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How can I check the length of the input string in edittext?