按下Handle back可不解除活动

我想像whatsapp一样处理回按,当用户回按时,键盘将被解除,如果用户再次回按,我们将转到聊天选项卡。在我的活动中,我希望当用户在键入键盘时按回键时,键盘会自动关闭,并且一些UI元素会得到处理。我尝试在onBackPressed()方法中处理这个问题,但它不起作用,活动被终止。

     edittext.setOnEditorActionListener (
                    new EditText.OnEditorActionListener () {
                        @Override
                        public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                            if (actionId == EditorInfo.IME_ACTION_SEARCH ||
                                    actionId == EditorInfo.IME_ACTION_DONE ||
                                    event != null &&
                                            event.getAction () == KeyEvent.ACTION_DOWN &&
                                            event.getKeyCode () == KeyEvent.KEYCODE_ENTER) {
                                if (event == null || !event.isShiftPressed ()) {
                                    // the user is done typing.

                                    View view1 = getCurrentFocus ();
                                    imm.hideSoftInputFromWindow (view1.getWindowToken (), 0);

                                    Log.e (TAG, "TYPING DONE ");
                                    result = tv_result.getText ().toString();

                                    return true; // consume.
                                }
                            }
                            return false; // pass on to other listeners.
                        }
                    }
            );

onBackPressed()代码

     @Override
    public void onBackPressed() {

    tv_result.setText("Some text");

}