TextWatcher for more than one EditText

Question

I want to implement the TextWatcher interface for more than one EditText fields. Currently I am using :

text1.addTextChangedListener(this); text2.addTextChangedListener(this); 

then overriding the methods in my Activity:

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)  {  // do some operation on text of text1 field  // do some operation on text of text2 field  } 

However this is working fine but I'm looking for other ways so that I can explicitly identify that in which EditText field the SoftKeyboard is currently focused.

Answer 1

Suggested solution in @Sebastian Roth's answer is not one instance of TextWatcher for some EditTexts. It is one class and n instances of that class for n EditTexts.

Each EditText has its own Spannable. TextWatcher's events has this Spannable as s parameter. I check their hashCode (unique Id of each object). myEditText1.getText() returns that Spannable. So if the myEditText1.getText().hashCode() equals with s.hashCode() it means that s belongs to myEditText1

So if you want to have one instance of TextWatcher for some EditTexts you should use this:

private TextWatcher generalTextWatcher = new TextWatcher() {          @Override     public void onTextChanged(CharSequence s, int start, int before,             int count) {          if (myEditText1.getText().hashCode() == s.hashCode())         {             myEditText1_onTextChanged(s, start, before, count);         }         else if (myEditText2.getText().hashCode() == s.hashCode())         {             myEditText2_onTextChanged(s, start, before, count);         }     }      @Override     public void beforeTextChanged(CharSequence s, int start, int count,             int after) {          if (myEditText1.getText().hashCode() == s.hashCode())         {             myEditText1_beforeTextChanged(s, start, count, after);         }         else if (myEditText2.getText().hashCode() == s.hashCode())         {             myEditText2_beforeTextChanged(s, start, count, after);         }     }      @Override     public void afterTextChanged(Editable s) {         if (myEditText1.getText().hashCode() == s.hashCode())         {             myEditText1_afterTextChanged(s);         }         else if (myEditText2.getText().hashCode() == s.hashCode())         {             myEditText2_afterTextChanged(s);         }     }  }; 

and

myEditText1.addTextChangedListener(generalTextWatcher); myEditText2.addTextChangedListener(generalTextWatcher);