如何在android中保持按钮的固定宽高比

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">

    <Button
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="2"
        android:text="Button" />

</LinearLayout>

<androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/button"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintDimensionRatio="2:1"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        android:text="Button" />

</androidx.constraintlayout.widget.ConstraintLayout>

public class FixedRatioButton extends Button {

    private static final float RATIO = 2.0f; // 宽高比例

    public FixedRatioButton(Context context) {
        super(context);
    }

    public FixedRatioButton(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public FixedRatioButton(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int width = MeasureSpec.getSize(widthMeasureSpec);
        int height = (int) (width / RATIO);
        int newHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
        super.onMeasure(widthMeasureSpec, newHeightMeasureSpec);
    }
}

<com.example.myapplication.FixedRatioButton
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Button" />