安卓开发-多个view使用同一个Listener

package com.xsh.opensltest;

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.RadioGroup;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.Nullable;

public class SlInstrumentTest extends Activity {

View.OnTouchListener pianoDownListener = new View.OnTouchListener()
    {
        @Override
        public boolean onTouch(View view, MotionEvent motionEvent)
        {
            if(motionEvent.getAction()==MotionEvent.ACTION_DOWN)
            {
                if(view.getId()==R.id.c4)
                {
                    onNote(1,0);
                }
                else if(view.getId()==R.id.d4)
                {
                    onNote(1,0);
                }

            }
            else if(motionEvent.getAction()==MotionEvent.ACTION_UP)
            {
                if(view.getId()==R.id.c4)
                {
                    onNote(0,1);
                }
                else if(view.getId()==R.id.d4)
                {
                    onNote(0,1);
                }
            }
            return false;
        }
    };
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_opensles);
        // 显示调试信息
        Button c4 = findViewById(R.id.c4);
        Button d4 = findViewById(R.id.d4);
        c4.setOnTouchListener(pianoDownListener);
        d4.setOnTouchListener(pianoDownListener);
 }