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Activity中通过标签获取当前Fragment
初始化完成之后才有数据,否则获取不到
String tag = "android:switcher:"+viewPager.getId()+":"+viewPager.getCurrentItem();
Fragment fg = getSupportFragmentManager().findFragmentByTag(tag);
if (fg == null) {
return;
}
switch (viewPager.getCurrentItem()) {
case 0:
((Fragment1)fg).updateUI();
break;
case 1:
((Fragment2) fg).upDateUI();
break;
case 2:
((Fragment3) fg).upDateUI();
break;
}
//ViewPage滑动变化监听
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
// doSomething
}
@Override
public void onPageSelected(int position) {
switch (position){
case 0:
// doSomething
break;
case 1:
// doSomething
break;
case 2:
// doSomething
break;
}
}
@Override
public void onPageScrollStateChanged(int state) {
//完全隐藏或显示时
if (state == 0) {
// doSomething
}
}
});
Activity中通过标签获取当前Fragment