在Android Studio中可以使用属性动画来实现扩大和缩小的圆形动画。以下是一个简单的示例代码：

1. 首先，在XML布局文件中，添加一个ImageView用于显示圆形图像：

2. 在Java代码中，使用属性动画来创建扩大和缩小的动画效果：

import android.animation.Animator;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.os.Bundle;
import android.view.View;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {
    private ImageView circleImageView;

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

        circleImageView = findViewById(R.id.circleImageView);

        // 创建扩大动画
        ObjectAnimator scaleXAnimator = ObjectAnimator.ofFloat(circleImageView, "scaleX", 1.0f, 1.5f);
        scaleXAnimator.setDuration(1000);
        scaleXAnimator.setRepeatMode(ObjectAnimator.REVERSE);
        scaleXAnimator.setRepeatCount(ObjectAnimator.INFINITE);

        ObjectAnimator scaleYAnimator = ObjectAnimator.ofFloat(circleImageView, "scaleY", 1.0f, 1.5f);
        scaleYAnimator.setDuration(1000);
        scaleYAnimator.setRepeatMode(ObjectAnimator.REVERSE);
        scaleYAnimator.setRepeatCount(ObjectAnimator.INFINITE);

        // 创建缩小动画
        ObjectAnimator scaleXAnimator2 = ObjectAnimator.ofFloat(circleImageView, "scaleX", 1.5f, 1.0f);
        scaleXAnimator2.setDuration(1000);
        scaleXAnimator2.setRepeatMode(ObjectAnimator.REVERSE);
        scaleXAnimator2.setRepeatCount(ObjectAnimator.INFINITE);

        ObjectAnimator scaleYAnimator2 = ObjectAnimator.ofFloat(circleImageView, "scaleY", 1.5f, 1.0f);
        scaleYAnimator2.setDuration(1000);
        scaleYAnimator2.setRepeatMode(ObjectAnimator.REVERSE);
        scaleYAnimator2.setRepeatCount(ObjectAnimator.INFINITE);

        // 创建动画集合
        AnimatorSet animatorSet = new AnimatorSet();
        animatorSet.play(scaleXAnimator).with(scaleYAnimator);
        animatorSet.play(scaleXAnimator2).with(scaleYAnimator2).after(scaleXAnimator);

        // 设置插值器
        animatorSet.setInterpolator(new AccelerateDecelerateInterpolator());

        // 开始动画
        animatorSet.start();
    }
}

3. 运行应用程序，你将看到圆形图像会在不断地扩大和缩小。