android studio怎么设置圆头像拍照

id.text.Editable;
import android.text.TextWatcher;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.kegoal.view.SelectPicPopupWindow;
import java.io.File;

public class MyInfoActivity extends AppCompatActivity implements View.OnClickListener {
private ImageView my_img, img_edit;

//自定义的弹出框类
SelectPicPopupWindow menuWindow;