Android M footerView.getMeasuredHeight() returns 错误

Question

上 Android 中

footerView.getMeasuredHeight()

returns 3373。这发生在我检查过的所有设备上运行 Android M。在 Nexus 5 上，它不会发生在 KitKat 版本上，但会发生在M版。我运行在实际设备上，从不在模拟器上。

测量发生在以下代码之后：

LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View appListItemView = layoutInflater.inflate(R.layout.view_selectable_app, null);
View headerView = layoutInflater.inflate(R.layout.app_feeds_container_header, null);
View footerView = layoutInflater.inflate(R.layout.apps_feed_container_footer, null);

appListItemView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
headerView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
footerView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));

appListItemView.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
headerView.measure(View.MeasureSpec.EXACTLY, View.MeasureSpec.UNSPECIFIED);
footerView.measure(View.MeasureSpec.EXACTLY, View.MeasureSpec.UNSPECIFIED);

重要的是不要 header 测量正确。

Answer 1

您为 measure() 调用使用了错误的参数。这是一个示例：

footerView 尺寸肯定不正确，因为你要求 EXACTLY，但具体是多少？

相反，它应该是这样的：

int widthMeasureSpec = MeasureSpec.makeMeasureSpec(parent.getWidth(), MeasureSpec.EXACTLY);
int heightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
footerView.measure(widthMeasureSpec, heightMeasureSpec);

Android M footerView.getMeasuredHeight() returns 错误

Android M footerView.getMeasuredHeight() returns incorrectly

android

android-view

android-6.0-marshmallow