Android：根据宽度在 XML 中设置按钮高度

Posted 2023-04-19

【中文标题】Android：根据宽度在 XML 中设置按钮高度

【英文标题】：Android: Setting button height in XML based on it's width

【发布时间】：2011-04-25 20:57:48

【问题描述】：

我正在处理 android XML 中的布局，我想在其中设置按钮高度以在设置填充父项时匹配它的宽度。显然这个数字会根据屏幕大小而变化，所以我不能使用设置的像素大小。有人可以帮我根据屏幕尺寸获取按钮宽度，然后将其传递给高度设置吗？

谢谢你， 乔什

【参考方案1】：

我曾经遇到过类似的问题，但没有找到仅适用于 XML 的解决方案。您必须编写自己的 Button-Class 并覆盖 [onMeassure][1] 方法。

例子：

/**
 * @see android.view.View#measure(int, int)
 */
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
    setMeasuredDimension(measureWidth(widthMeasureSpec), measureHeight(heightMeasureSpec));


private int width; // saves the meassured width


/**
 * Determines the width of this view
 * 
 * @param measureSpec
 *            A measureSpec packed into an int
 * @return The width of the view, honoring constraints from measureSpec
 */
private int measureWidth(int measureSpec) 
    int result = 30;
    int specMode = MeasureSpec.getMode(measureSpec);
    int specSize = MeasureSpec.getSize(measureSpec);

    if (specMode == MeasureSpec.EXACTLY) 
        // We were told how big to be
        result = specSize;
     else 
        result =1123; // meassure your with here somehow
        if (specMode == MeasureSpec.AT_MOST) 
            // Respect AT_MOST value if that was what is called for by measureSpec
            result = Math.min(result, specSize);
        
    
            width = result;
    return result;


/**
 * Determines the height of this view
 * 
 * @param measureSpec
 *            A measureSpec packed into an int
 * @return The height of the view, honoring constraints from measureSpec
 */
private int measureHeight(int measureSpec) 
    int result = 0;
    int specMode = MeasureSpec.getMode(measureSpec);
    int specSize = MeasureSpec.getSize(measureSpec);

    if (specMode == MeasureSpec.EXACTLY) 
        // We were told how big to be
        result = specSize;
     else 
        result = width;
        if (specMode == MeasureSpec.AT_MOST) 
            // Respect AT_MOST value if that was what is called for by measureSpec
            result = Math.min(result, specSize);
        
    

    return result;

[1]：http://developer.android.com/reference/android/view/View.html#onMeasure(int，整数）

【参考方案2】：

不使用PX的Pixel size，而是提到dip（即设备独立像素），dip会根据设备屏幕尺寸独立采用像素大小。

例如：android:textSize="12dip"

您可以使用 dip 或 dp。

享受！！