Removing unused imports (fixes compat issues)

import android.content.SharedPreferences;

import android.net.Uri;

import android.os.Bundle;

import android.os.Handler;

import android.os.Looper;

import android.os.Message;

import android.os.PersistableBundle;

import android.os.ResultReceiver;

import android.preference.PreferenceManager;

import android.telecom.PhoneAccount;

import android.telecom.PhoneAccountHandle;

import android.telecom.TelecomManager;

import android.telephony.CarrierConfigManager;

import android.text.Editable;

import android.text.InputFilter;

import android.text.TextUtils;

import android.view.View;

import android.view.ViewGroup;

import android.view.ViewTreeObserver;

import android.view.WindowManager;

import android.view.inputmethod.InputMethodManager;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;