I suppose you are referring to changing from one screen (activity) to another by typing something and not by clicking a button. If that is the case use TextWatcher and on change check for your string (or command) and move to next screen. Something like.
textView.addTextChangedListener(new TextWatcher(){
public void afterTextChanged(Editable s) {}
public void beforeTextChanged(CharSequence s, int start, int count, int after){}
public void onTextChanged(CharSequence s, int start, int before, int count){
if("second".equalsIgnoreCase(s)){
Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);
}
}
});
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solved How to make a text change you from one screen to another [closed]