auto send edittext

You can specify the action by setting theandroid:imeOptions attribute. For example, here's how you can specify the Send action:

<EditText
    android:id="@+id/search"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:hint="@string/search_hint"
    android:inputType="text"
    android:imeOptions="actionSend" />

If you do not explicitly specify an input action then the system attempts to determine if there are any subsequentandroid:focusable fields. If any focusable fields are found following this one, the system applies the (@code actionNext} action to the current EditText so the user can select Next to move to the next field. If there's no subsequent focusable field, the system applies the "actionDone" action. You can override this by setting theandroid:imeOptions attribute to any other value such as "actionSend" or "actionSearch" or suppress the default behavior by using the "actionNone" action.

Responding to action button events

If you have specified a keyboard action for the input method using android:imeOptions attribute (such as"actionSend"), you can listen for the specific action event using an TextView.OnEditorActionListener. The TextView.OnEditorActionListener interface provides a callback method called onEditorAction()that indicates the action type invoked with an action ID such as IME_ACTION_SEND or IME_ACTION_SEARCH.

For example, here's how you can listen for when the user clicks the Send button on the keyboard:

EditText editText = (EditText) findViewById(R.id.search);
editText.setOnEditorActionListener(new OnEditorActionListener() {
    @Override
    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
        boolean handled = false;
        if (actionId == EditorInfo.IME_ACTION_SEND) {
            sendMessage();
            handled = true;
        }
        return handled;
    }
});