Useful to listen to just key up and back key events for a text input or edittext. Turns out it doesn't work on some devices as some send hardware key events and some send soft keyboard events. This doesn't work with soft keyboard events.

TextInputOnKeyChangedListener.java

public class TextInputOnKeyChangedListener implements EditText.OnKeyListener {

	private EditText editText;

	private OnKeyChangedListener onKeyChangedListener;

	public interface OnKeyChangedListener {
		void onKeyUp(String text);

		void onBackPressed();
	}

	public TextInputOnKeyChangedListener(EditText editText, OnKeyChangedListener onKeyChangedListener) {
		this.editText = editText;
		this.onKeyChangedListener = onKeyChangedListener;
	}

	@Override
	public boolean onKey(View view, int i, KeyEvent keyEvent) {

		if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_BACK) {
			onKeyChangedListener.onBackPressed();
			return true;
		}

		if (keyEvent.getAction() == KeyEvent.ACTION_UP) {
			onKeyChangedListener.onKeyUp(editText.getText().toString());
			return true;
		}

		return false;
	}

}