Android noob在这里,我的主要活动中有一个功能可以刷新天气数据;它通过调用两个片段中的函数来实现这一点,这两个片段从Web API中提取新数据。当你点击刷新按钮/更改位置时,我希望两个片段布局交叉淡入淡出,我似乎无法获得animateLayoutChanges =" true"做我期望的事情(当视图设置为View.GONE并返回View.VISIBLE时交叉淡入淡出)。我是按错误的顺序做事吗?
我的代码:
public void refreshCity(){
//This block sets references to the fragment layouts and sets them to GONE
RelativeLayout wfLayout = (RelativeLayout)findViewById(R.id.fragment_weather);
LinearLayout ffLayout = (LinearLayout)findViewById(R.id.fragment_forecast);
wfLayout.setVisibility(View.GONE);
ffLayout.setVisibility(View.GONE);
//This block gets references to the fragments themselves and calls the
//changeCity function in each with the current city - this block definitely works
FragmentManager fm = getSupportFragmentManager();
WeatherFragment wf = (WeatherFragment)fm
.findFragmentByTag(makeFragmentName(R.id.pager, 0));
ForecastFragment ff = (ForecastFragment)fm
.findFragmentByTag(makeFragmentName(R.id.pager, 1));
CityPreference cf = new CityPreference(this);
wf.changeCity(cf.getCity());
ff.changeCity(cf.getCity());
//I then set the layouts back to visible
wfLayout.setVisibility(View.VISIBLE);
ffLayout.setVisibility(View.VISIBLE);
}
片段刷新并显示数据,但没有淡入淡出。两个片段布局中的animateLayoutChanges都设置为true,是否有一些保护用于引用它们引用的片段之外的布局?非常感谢任何帮助!
答案 0 :(得分:0)
所以我提出的解决方案;我使用xml文件中的animateLayoutChanges进行了报废,并为每个片段的changeCity()函数添加了一个ViewPropertyAnimator(用于更新视图中显示的数据)。
public void changeCity(final String city){
final LinearLayout layout = (LinearLayout)getActivity()
.findViewById(R.id.fragment_forecast);
layout.animate().setDuration(600);
layout.animate().alpha(0);
Runnable endAction = new Runnable() {
@Override
public void run() {
updateForecastData(city);
layout.animate().alpha(1);
}
};
layout.animate().withEndAction(endAction);
}
更新数据并淡化视图的调用我置于使用ViewPropertyAnimator函数withEndAction(Runnable runnable)
调用的runnable中,该函数仅在当前动画完成后运行,因此视图淡出 - >运行endAction runnable,更新数据 - >意见逐渐消失。