Android edittext input listening, dynamic acquisition of input characters

Source: Internet
Author: User

Sometimes we may use the constant listening for the edittext input characters, the number of listening characters, and some regular expression processing. The following methods can be implemented:

What I do is synchronize the data input by editetext to textview from time to time.

Layout file:

<Relativelayout xmlns: Android = "" xmlns: Tools = "" Android: layout_width = "match_parent" Android: layout_height = "match_parent"> <textview Android: id = "@ + ID/textview" Android: layout_width = "wrap_content" Android: layout_height = "wrap_content" Android: layout_centerhorizontal = "true" Android: layout_centervertical = "true" Android: padding = "@ dimen/padding_medium" tools: context = ". test02activity "/> <edittext Android: Id =" @ + ID/edittext1 "Android: layout_width =" fill_parent "Android: layout_height =" wrap_content "Android: layout_alignleft = "@ + ID/textview" Android: layout_below = "@ + ID/textview" Android: layout_margintop = "31dp"> <requestfocus/> </edittext> </relativelayout>


Package COM. example. testdemo; import android. OS. bundle; import android. app. activity; import android. util. log; import android. view. menu; import android. view. menuitem; import android. widget. edittext; import android. widget. textview; import android. support. navutils; import android. text. editable; import android. text. textwatcher; public class test02activity extends activity {Private Static final string tag = "test"; private edittext medittext; private textview mtextview; @ override public void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. activity_test02); medittext = (edittext) findviewbyid (R. id. edittext1); mtextview = (textview) findviewbyid (R. id. textview); medittext. addtextchangedlistener (New textwatcher () {@ overridepublic void aftertextchanged (editable s) {log. D (TAG, "aftertextchanged") ;}@ overridepublic void beforetextchanged (charsequence S, int start, int count, int after) {log. D (TAG, "beforetextchanged:" + S + "-" + start + "-" + Count + "-" + after) ;}@ overridepublic void ontextchanged (charsequence s, int start, int before, int count) {log. D (TAG, "ontextchanged:" + S + "-" + "-" + start + "-" + before + "-" + count); mtextview. settext (s) ;}}) ;}@ override public Boolean oncreateoptionsmenu (menu) {getmenuinflater (). inflate (R. menu. activity_test02, menu); Return true ;}}
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