ViewGroupOverlay
不对添加到其中的视图执行布局传递;也就是说,在现有布局中添加View时会自动执行,您需要手动执行measure()
and layout()
以便在屏幕上正确显示视图。
您的代码与 Drawable 一起使用的原因是因为您正在执行布局步骤myIcon.setBounds(0,0,100,100)
;
如果您使用此代码,您将获得与 Drawable 相同的效果:
View view = inflater.inflate(R.layout.overlay, null);
view.measure(View.MeasureSpec.makeMeasureSpec(100, View.MeasureSpec.EXACTLY), View.MeasureSpec.makeMeasureSpec(100, View.MeasureSpec.EXACTLY));
view.layout(0, 0, 100, 100);
gridView.getOverlay().add(view);
您可以在此处阅读有关度量/布局的更多信息:https://developer.android.com/guide/topics/ui/how-android-draws.html https://developer.android.com/guide/topics/ui/how-android-draws.html
您可以使用此辅助方法来显示视图,就好像它已添加到空的全屏中一样:
private static void measureAndLayout(Activity activity, View toMeasure, int statusBarHeight) {
DisplayMetrics displayMetrics = new DisplayMetrics();
activity.getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
toMeasure.measure(
View.MeasureSpec.makeMeasureSpec(displayMetrics.widthPixels, View.MeasureSpec.EXACTLY) ,
View.MeasureSpec.makeMeasureSpec(displayMetrics.heightPixels - statusBarHeight, View.MeasureSpec.EXACTLY));
toMeasure.layout(0, statusBarHeight, displayMetrics.widthPixels, displayMetrics.heightPixels);
}