I need some help about sendKeyEvent in InputMethodService

I’m start InputMethodService from activity and want service send keyEvent to phone

i’m test sendKeyEvent in onBindInput and test by open soft keyboard by search in google chrome. it’s work. but i try to sendKeyEvent in onStart but my app was crash.

public class EDMTKeyboard extends InputMethodService implements KeyboardView.OnKeyboardActionListener {

private KeyboardView kv; private Keyboard keyboard;  private  boolean isCaps = false; private Intent intent;  @Override public void onStart(Intent intent, int startid) {     String Receive = intent.getStringExtra("Command");     Toast.makeText(this, "Service Started "+Receive, Toast.LENGTH_LONG).show();     InputConnection ic = getCurrentInputConnection();     ic.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_BACK));     ic.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_BACK));  }