在Android中,有时需要对控件进行测量,得到的控件宽度和高度可以用来做一些计算。在需要自适应屏幕的情况下,这种计算就显得特别重要。另一方便,由于需求的原因,希望一进入界面后,就能得到控件的宽度和高度。
可惜的是,根据我的验证,利用网上转载的那些方法在OnCreate函数中获取到的仍然是0(希望搞技术的能自己验证过再转载),例如Measure方法之后调用getMeasuredWidth的值还是0。
原因是因为当OnCreate函数发生时,只是提供了数据初始化的机会,此时还没有正式绘制图形。而绘制图形在OnDraw中进行,此时计算又显得太晚。容易想到的办法是:希望能在程序刚刚测量好某个指定控件后,拿到它的宽度和高度立刻进行计算或数据初始化。这就需要有一个方法来监听到这个事件的发生,幸好Android提供了这样的机制,利用View类中的getViewTreeObserver方法,可以获取到指定View的观察者,在绘制控件前的一刹那进行回调,这样速度上又不耽误,得到的数据由是准确的,但此方法在之后可能会被反复调用,因此需要加入限制,普通需求下,只计算一次就够了,代码如下(此代码在OnCreate回调函数中验证通过,实时上,因为它是监听器,所以发生事件时已经和OnCreate无关了):
layout = (MetroLayout) findViewById(R.id.layout); ViewTreeObserver vto = layout.getViewTreeObserver(); vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() { public boolean onPreDraw() { if (hasMeasured == false) { int height = metroLayout.getMeasuredHeight(); int width = metroLayout.getMeasuredWidth(); //获取到宽度和高度后,可用于计算 hasMeasured = true; } return true; } });
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