Restrict the length of Edittext characters
1) Open your sketchware project.Add edittext.
In the logic section, OnActivityCreate 
Add the following code
InputFilter[] editFilters = edittext1.getFilters();
InputFilter[] newFilters = new InputFilter[editFilters.length + 1];
System.arraycopy(editFilters, 0, newFilters, 0, editFilters.length);
newFilters[editFilters.length] = new InputFilter.LengthFilter(10); 
edittext1.setFilters(newFilters);If you have any doubts , comment below
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