我为
android实现了BottomNavigation视图,我有一些片段显示为BottomNavigation页面.根据
Google Material Design Guide Lines我想用交叉淡入淡出动画显示片段.
通过触摸BottomNavigation的项目,我的ViewpPager使用默认幻灯片动画更改片段.
我在this和this阅读了一些解决方案.但这些并不是真正的淡入淡出动画,我无法设置渐弱的持续时间.
那么有什么方法可以在更改ViewPager的选项卡时设置动画？
解决方法
最后,我找到了答案.
我用一个布局更改了ViewPager以保留我的片段(帧布局).然后我将片段添加到fragmentTransaction中.
通过触摸BottomNavigation上的项目,当前片段隐藏和新片段将显示为使用fragmentTransaction中定义的淡入淡出动画.
这是我的代码：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_page);
addFragmentsToManager();
}
private void addFragmentsToManager() {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.setCustomAnimations(R.anim.fade_in,R.anim.fade_out);
fragmentTransaction.add(R.id.flContent,tripFragment,tripFragment.getClass().getSimpleName());
fragmentTransaction.add(R.id.flContent,notificationFragment,notificationFragment.getClass().getSimpleName());
fragmentTransaction.add(R.id.flContent,searchFragment,searchFragment.getClass().getSimpleName());
fragmentTransaction.add(R.id.flContent,profileFragment,profileFragment.getClass().getSimpleName());
fragmentTransaction.hide(tripFragment);
fragmentTransaction.hide(notificationFragment);
fragmentTransaction.hide(searchFragment);
fragmentTransaction.hide(profileFragment);
fragmentTransaction.commit();
}
private void changeTab(int position) {
Fragment fragment;
switch (position) {
fragment = .....// get framgnet from position
}
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.setCustomAnimations(R.anim.fade_in,R.anim.fade_out);
fragmentTransaction.hide(prvFragment);
fragmentTransaction.show(fragment).commit();
prvFragment = fragment;
}