Question

我想在Android的oncreate方法中获得控件的大小,用网上的方法并没有获取到,大家帮我看看下面代码哪里有错

用下面的代码并没有在Logcat中获得到相关的log信息,大家帮我看看怎么回事?

<Button
android:id="@+id/btn1"
android:text="按钮1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="2"/>

btn1 = (Button) findViewById(R.id.btn1);
ViewTreeObserver vto = btn1.getViewTreeObserver();
vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
public boolean onPreDraw() {
int height = btn1.getMeasuredHeight();
int width = btn1.getMeasuredWidth();
Log.i("info","\nwidth: " + width + "\nheight: " + height);
return true;
}
});

Answer 1

只有在view加载完毕之后获取才有用，除非你定死空间的宽高，否则只能在onWindowFocusChanged(boolean hasFocus)中当hasFocus为true之后获取