我使用ActivityInstrumentationTestCase2来测试我的UI。我的测试将改变屏幕上显示的某些值。但是,在设置值之后,我会通过拍摄快照图像来测试屏幕,在位图上运行校验和并将校验和值与预期值进行比较。但在设置UI值后,Android尚未完成UI的更新。我所知道的唯一解决方案是使用延迟等待几秒钟,虽然这是不可取的,因为它有不必要的等待时间,加起来有足够的测试。有没有办法知道Android何时实际更新了我的UI?
答案 0 :(得分:0)
做了一些研究我发现了这个。还没试过呢:
要获得有关系统UI可见性更改的通知,请注册 View.OnSystemUiVisibilityChangeListener到您的视图。这是 通常是您用来控制导航可见性的视图。
例如,您可以将此代码添加到您的活动的onCreate() 方法:
View decorView = getWindow().getDecorView();
decorView.setOnSystemUiVisibilityChangeListener
(new View.OnSystemUiVisibilityChangeListener() {
@Override
public void onSystemUiVisibilityChange(int visibility) {
// Note that system bars will only be "visible" if none of the
// LOW_PROFILE, HIDE_NAVIGATION, or FULLSCREEN flags are set.
if ((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
// TODO: The system bars are visible. Make any desired
// adjustments to your UI, such as showing the action bar or
// other navigational controls.
} else {
// TODO: The system bars are NOT visible. Make any desired
// adjustments to your UI, such as hiding the action bar or
// other navigational controls.
}
}
});
http://developer.android.com/training/system-ui/visibility.html