Defining Button in OnCreate - Cannot resolve symbol in method

I'm a beginner as you'll see. I can't see where I can legally put the Button statements and the setText statements so this will compile. If I move one the other doesn't work and vice versa. I understand that the OnCreate is protected and so the "buttonOne" won't be passed to the playPhrases method but I've been changing thing around for a while now and nothing works. Simple explanations please.

    package com.example.android.languageapp;

import android.media.MediaPlayer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

import static android.R.attr.button;

public class MainActivity extends AppCompatActivity {

    MediaPlayer myMediaPlayer;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myMediaPlayer = MediaPlayer.create(this, R.raw.hello);

        String[] phrases = getResources().getStringArray(R.array.phrase);



        Button buttonOne = (Button) findViewById(R.id.button1);
        Button buttonTwo = (Button) findViewById(R.id.button2);
        Button buttonThree = (Button) findViewById(R.id.button3);
        Button buttonFour = (Button) findViewById(R.id.button4);
        Button buttonFive = (Button) findViewById(R.id.button5);
        Button buttonSix = (Button) findViewById(R.id.button6);
        Button buttonSeven = (Button) findViewById(R.id.button7);
        Button buttonEight = (Button) findViewById(R.id.button8);

        buttonOne.setText(phrases[0]);
        buttonTwo.setText(phrases[1]);
        buttonThree.setText(phrases[2]);
        buttonFour.setText(phrases[3]);
        buttonFive.setText(phrases[4]);
        buttonSix.setText(phrases[5]);
        buttonSeven.setText(phrases[6]);
        buttonEight.setText(phrases[7]);
    }


    public void playPhrases(View clickedButton) {

        int id = clickedButton.getId();

        Log.i("Button id", "" + id);

        if (id == buttonOne.getId()) {

            myMediaPlayer = MediaPlayer.create(this, R.raw.doyouspeakenglish);

            myMediaPlayer.start();
        }


    }



}

Thanks for your help