根据xml设置自定义视图的高度和宽度

<com.example.MyCustomView
    android:layout_width="200dp"
    android:layout_height="150dp" />

public class MyCustomView extends View {
    public MyCustomView(Context context) {
        super(context);
    }

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

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

    @Override
    protected void onDraw(Canvas canvas) {
        // 在此处实现自定义视图的绘制逻辑
        super.onDraw(canvas);
    }
}

public MyCustomView(Context context, AttributeSet attrs) {
    super(context, attrs);
    TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.MyCustomView);
    int width = typedArray.getDimensionPixelSize(R.styleable.MyCustomView_custom_width, ViewGroup.LayoutParams.WRAP_CONTENT);
    int height = typedArray.getDimensionPixelSize(R.styleable.MyCustomView_custom_height, ViewGroup.LayoutParams.WRAP_CONTENT);
    typedArray.recycle();

    // 根据获取到的宽度和高度进行处理
    // ...
}

<resources>
    <declare-styleable name="MyCustomView">
        <attr name="custom_width" format="dimension" />
        <attr name="custom_height" format="dimension" />
    </declare-styleable>
</resources>