androidのSurfaceViewでのonTouchEventが呼ばれない

Question

androidstudioでandroidアプリを開発しており、xmlファイルで作成したsurfaceView上でのタッチを認識させたいのですがうまくいきません。ログを見てもタッチが反応されていない状態でした。onTouchEventをdispatchTouchEventに変えてみてもダメでした。どなたかわかる方いらっしゃいますか？

言語　JAVA

コード
package com.example.pbl_app;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.media.PlaybackParams;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import java.io.IOException;

public class SubActivity extends MainActivity {
boolean play = false;
int cx = 515, cy = 485;
private SurfaceView surfaceView;
private MySurfaceView mySurfaceView;
PlaybackParams params = new PlaybackParams();
public long moveX,moveY=0;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.next_activity);
    surfaceView = (SurfaceView) findViewById(R.id.surfaceViewSub);
    mySurfaceView = new MySurfaceView(this,surfaceView);
    final Button PButton = findViewById(R.id.PlayButton);
    final Button EButton = findViewById(R.id.ExitButton);
    PButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            EditVoice();
            if (play) {
                stopPlaying();
                play = true;
            } else {
                startPlaying();
                play = false;
            }
        }
    });
}
private void startPlaying() {
    try {
        player.setDataSource(fileName);
        player.setPlaybackParams(params);
        player.prepare();
        player.start();
    } catch (IOException e) {
        player.release();
        player = null;
    }
}

private void stopPlaying() {
    player.release();
    player = null;
}

public void EditVoice() {
    params.setPitch(3.f);
    params.setSpeed(2.f);
}

public class MySurfaceView extends SurfaceView //SurfaceViewを描画するクラス
        implements Runnable, SurfaceHolder.Callback {
    Canvas canvas = null;
    private float width,height;
    public Paint mPaint = new Paint();
    public Paint ballPaint = new Paint();
    static final int BALL_R = 20;//ボールの大きさ
    Bitmap bmp = BitmapFactory.decodeResource(getResources(),R.drawable.picture1);
    SurfaceHolder holder;
    Thread thread;
    StringBuilder msg = new StringBuilder();

    public MySurfaceView(Context context, SurfaceView surfaceView) {
        super(context);//コンストラクタ。SurfaceView描画に用いるコールバックを登録する。
        holder = surfaceView.getHolder();
        holder.addCallback(this);
    }

    @Override
    public void run() {
        ballPaint.setStyle(Paint.Style.FILL);
        ballPaint.setColor(Color.RED);
        while (thread != null) {
            doDraw(holder);
        }
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        thread = new Thread(this);
        thread.start();
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        thread = null;
    }

    private void doDraw(SurfaceHolder holder) {
        if (thread != null) {
            canvas = holder.lockCanvas();
            if(moveX < 0 || moveX < this.width ) {
                cx += moveX;
            }
            if(moveY < 0 || moveY < this.height ) {
                cy += moveY;
            }
            canvas.drawBitmap(bmp, 0, 0, mPaint);
            canvas.drawCircle(cx,cy,BALL_R,ballPaint);
            holder.unlockCanvasAndPost(canvas);
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event){
        switch(event.getAction()){
            case MotionEvent.ACTION_DOWN:
                msg.append(event.getX());
                mPaint.setColor(Color.BLACK);
                canvas.drawCircle(cx,100,BALL_R,mPaint);
                Log.v("DOWN,X\n",msg.toString());
                break;
            case MotionEvent.ACTION_MOVE:
                moveX += event.getX();
                moveY += event.getY();
                msg.append(event.getY());
                Log.v("Y",msg.toString());
                break;
            default:
                break;
        }
        return true;
    }
}

}