我使用的是支持包 v4。
mFragmentManager = getSupportFragmentManager();
FragmentTransaction ft = mFragmentManager.beginTransaction();
ft.add(R.id.fragContainer1, new ModelListFragment(), FRAG_MODEL_LIST);
ft.add(R.id.fragContainer2, new TrimListFragment(), FRAG_TRIM_LIST);
ft.commit();
Fragment fragment = mFragmentManager.findFragmentByTag(
MainActivity.FRAG_MODEL_LIST);
Log.d("MY", "found fragment: " + (fragment != null));
但总是返回"found fragment: false"
,我不知道遗漏了什么东西,请大家帮忙。