Android 中图像视图的边框

xml
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    tools:context=".MainActivity">
            android:id="@+id/imageView"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:background="@drawable/border"
        android:src="@drawable/image" />

java
public class MainActivity extends AppCompatActivity {
    private ImageView imageView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView = findViewById(R.id.imageView);
        imageView.setImageResource(R.drawable.image);
    }
}