Event on EditText

I have one edittext name say eid ..now what i want is as soon as user enter eid value ..an another edittext say "o开发者_StackOverflow社区id" now oid should automatically generate it's value out of the value entered in eid ..so which event should i use to perform above task.. plz help i am very new in android

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You can use textWatcher on Edit Text, it gets all the changes in Edit Text, and triggers appropriate functions.

eid.addTextChangedListener(new TextWatcher() {
    public void onTextChanged(CharSequence s, int start, int before, int count) {

    }
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

    }

    public void afterTextChanged(Editable s) {
        // set oid value now
        oid.setText(eid.getText().toString());
    }
});

Whenever the text will change of "eid" method afterTextChanged will be called and it will set the value of oid also.

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if you have two edittextbox with two different names for ex. et1 and et2 then you can write the event handlers for them like

et1= (EditText) findViewById(R.id.EditText01);
et2= (EditText) findViewById(R.id.editText1);


et1.addTextChangedListener(new TextWatcher() {
    public void onTextChanged(CharSequence s, int start, int before, int count) {


    }
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

    }

    public void afterTextChanged(Editable s) {

    }
});


et2.addTextChangedListener(new TextWatcher() {

    public void onTextChanged(CharSequence s, int start, int before, int count) {
        // TODO Auto-generated method stub

    }

    public void beforeTextChanged(CharSequence s, int start, int count,
            int after) {
        // TODO Auto-generated method stub
    }

    public void afterTextChanged(Editable s) {
        // TODO Auto-generated method stub

    }
});

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Here is a blog-post on how to get "change" events on an EditText field. Once you get the value from the eid, just throw it into the oid.

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I think what you are asking for is an OnFocusChangeListener. Create a private subclass in your activity like that:

public MyActivity extends Activity {

  private class MyFocusChangeListener implements OnFocusChangeListener {
    private EditText editText;

    public MyFocusChangeListener(EditText editText) {
      this.editText = editText;
    }

    @Override
    public void onFocusChange(View view, boolean isFocused) {
      if (!isFocused) {
        // View lost focus - now do your stuff
      }
    }
  }

  @Override
  public void onCreate(Bundle bundle) {
    // ...
    editText.setOnFocusChangeListener(new MyFocusChangeListener(editText));
    // ...
  }
}

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if you are new to android, why dont you go through some tutorials first... You can also use a button in front of edittext and when user presses that button, you can do whatever you want

probably add text change listner on eid:

eid.addTextChangeListner(...)

One of the function needs to be implemented is:

afterTextChanged(s: Editable){
    // generate value and set in oid
    oid.setText(generateSome(s.toString()))
}