如何在离开活动时停止应用程序的振动？

import android.app.Activity;
import android.os.Bundle;
import android.os.Vibrator;

public class MainActivity extends Activity {
    private Vibrator vibrator;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 获取振动器实例
        vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
    }

    @Override
    protected void onStop() {
        super.onStop();

        // 停止振动
        vibrator.cancel();
    }
}