Persist radian/degree mode

package com.android.calculator2;

import android.app.AlertDialog;

import android.content.Context;

import android.content.DialogInterface;

import android.content.SharedPreferences;

import android.net.Uri;

import android.os.AsyncTask;

import android.os.Handler;

import android.preference.PreferenceManager;

import android.util.Log;

import com.hp.creals.AbortedError;

class Evaluator {

    private static final String KEY_PREF_DEGREE_MODE = "degree_mode";

    private final Calculator mCalculator;

    private final CalculatorResult mResult;  // The result display View

    private CalculatorExpr mExpr;      // Current calculator expression

        // The expression may have changed since the last evaluation in ways that would

        // affect its value.

    private SharedPreferences mSharedPrefs;

    Evaluator(Calculator calculator,

              CalculatorResult resultDisplay) {

        mCalculator = calculator;

        mSaved = new CalculatorExpr();

        mSavedName = "none";

        mTimeoutHandler = new Handler();

        mDegreeMode = false;  // Remain compatible with previous versions.

        mSharedPrefs = PreferenceManager.getDefaultSharedPreferences(calculator);

        mDegreeMode = mSharedPrefs.getBoolean(KEY_PREF_DEGREE_MODE, false);

    }

    // Result of asynchronous reevaluation

        mExpr.delete();

    }

    void setDegreeMode(boolean degrees) {

    void setDegreeMode(boolean degreeMode) {

        mChangedValue = true;

        mDegreeMode = degrees;

        mDegreeMode = degreeMode;

        mSharedPrefs.edit()

                .putBoolean(KEY_PREF_DEGREE_MODE, degreeMode)

                .apply();

    }

    boolean getDegreeMode() {