Fragment切换
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replace，加回退栈，Fragment不销毁，但是切换回销毁视图和重新创建视图。
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replace,不加回退栈，Fragment销毁掉。
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hide、show,Fragment不销毁，也不销毁视图。隐藏和显示不走生命周期。
replace
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private FragmentTransaction switchFragment(Fragment targetFragment) {
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
if (!targetFragment.isAdded()) {
transaction.add(R.id.fragmentShow,targetFragment,targetFragment.getClass().getName());
}
transaction.replace(R.id.fragmentShow,targetFragment);
currentFragment = targetFragment;
return transaction;
}
hide,show
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private FragmentTransaction switchFragment(Fragment targetFragment) {
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
if (!targetFragment.isAdded()) {
//第一次使用switchFragment()时currentFragment为null，所以要判断一下
if (currentFragment != null) {
transaction.hide(currentFragment);
}
transaction.add(R.id.fragmentShow,targetFragment,targetFragment.getClass().getName());
} else {
transaction.hide(currentFragment).show(targetFragment);
}
currentFragment = targetFragment;
return transaction;
