Android：在代码中设置小部件尺寸的通用方法？
我有一个自定义按钮，我想在代码中设置其尺寸（而不是在 xml 中），以便用户可以自定义尺寸。看似显而易见的方法是：
public class MyButton extends Button
{
public MyButton(Context context, AttributeSet attrs)
{
super(context, attrs);
int buttonSize = getSize();
setLayoutParams(new LinearLayout.LayoutParams(buttonSize, buttonSize));
}
但是，这并不通用，因为它仅在 Button 的父级是 LinearLayout 时才有效。相反，我尝试了这个：
@Override
protected void onMeasure(int specw, int spech)
{
int spec = MeasureSpec.makeMeasureSpec(getButtonSize()), MeasureSpec.EXACTLY);
super.onMeasure(spec, spec);
}
......这似乎运作良好。有人知道这有什么缺点吗？或者知道在代码中通用设置小部件尺寸的更好方法？
I have a custom Button and I want to set its dimensions in code (as opposed to in xml), so that users can customize the dimensions. The seemingly obvious way to this is:
public class MyButton extends Button
{
public MyButton(Context context, AttributeSet attrs)
{
super(context, attrs);
int buttonSize = getSize();
setLayoutParams(new LinearLayout.LayoutParams(buttonSize, buttonSize));
}
However, this fails to be generic because it only works if the Button's parent is a LinearLayout. Instead, I tried this:
@Override
protected void onMeasure(int specw, int spech)
{
int spec = MeasureSpec.makeMeasureSpec(getButtonSize()), MeasureSpec.EXACTLY);
super.onMeasure(spec, spec);
}
...which seems to work well. Is anyone aware of any shortcomings to this? or aware of a better way to generically set widget dimensions in code?
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从 onMeasure() 执行此操作是一个很好的方法（即使您的代码不起作用，因为您没有使用您创建的度量规范。）您还可以覆盖 onFinishInflate() 并调用 getLayoutParams() 和更改宽度和高度字段。
Doing it from onMeasure() is a good way to do it (even though your code doesn't work since you're not using the measure spec you've created.) You could also override onFinishInflate() and call getLayoutParams() and change the width and height fields.