android - 你如何访问自定义 View 的android :layout_width and android:layout_height parameters?

Question

如何访问自定义 View 的 android:layout_width 和 android:layout_height 值？

示例 xml:

<com.example.CustomButton
    android:id="@+id/btn"
    android:layout_width="150dp"
    android:layout_height="70dp" />

在自定义按钮中:

@Override
protected void onMeasure(int widthSpec, int heightSpec) {
    int measuredWidth = MeasureSpec.getSize(widthSpec);
    int measuredHeight = MeasureSpec.getSize(heightSpec);
    // How can we measure based on android:layout_width, android:layout_height?
    // Currently this implementation measures off the parent's values
    setMeasuredDimension(measuredWidth, measuredHeight);
}

Answer 1

您必须获取 View 的布局参数:

CustomButton.LayoutParams viewParams = yourView.getLayoutParams();

然后您可以访问或修改宽度或 View :

viewParams.height;
viewParams.width;

希望对您有所帮助!