Since dynamic Fragment does not add id, general communication uses Activity to indirectly manipulate components, instead of directly obtaining Fragment.
You can also send information by broadcasting to operate.
But I found that all Fragment objects can be obtained, which resulted in a method of obtaining dynamically added Fragments.
Defect: The Fragment to be obtained must be used only once (there is only one object in an Activity).
1. Normal operation method
https://blog.csdn.net/u012702547/article/details/49786417
不做赘述，直接介绍强行获取Fragment对象的方法。
2. Get the Fragment object
first step.
Fragment->Activity, the method is the same as above, omitted.
Step 2.
// 从所有Fragment中查找唯一的RightFragment对象，注意：要获取的Fragment一定要唯一。
List<Fragment> fragments = fragmentManager.getFragments();
for (Fragment f: fragments) {
if (RightFragment.class.isInstance(f)) {
fragmentRight = f;
break;
}
}
TextView tv_fra_right = fragmentRight.getView().findViewById(R.id.tv_fraright);
tv_fra_right.setText(mes + "再传到RightFragment中。");
if (fragmentRight != null) {
tv_activity = fragmentRight.getActivity().findViewById(R.id.tv_fraright);
LogUtil.d("FragmentActivity showProMes", "使用了fragment对象。");
}
// 三件套必须一起用才稳键。
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.lin_fra_right, fragmentRight);
fragmentTransaction.commit();
Zhuang Zhouxiao dreams of butterflies, and Wang Dichun cares for the cuckoo. ——Li Shangyin