点击RadioGroup切换Fragment

1、框架的搭建：Fragment、RadioGroup组成。
2、Main的主布局由，帧布局和RadioGroup组成，在MainActivity中创建Fragment，组成集合，添加到帧布局中。
3、设置RadioGroup的按键监听，记录坐标，从相应的Fragment集合中获取相对应的fragment。
private void initData() {
fragments = new ArrayList<>();
shopFragment = new ShopFragment();
fragments.add(shopFragment);
fragments.add(new MgzFragment());
fragments.add(new DarenFragment());
fragments.add(new GoodFragment());
fragments.add(new SelfFragment());
}

private void initView() {    rgMain.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {        @Override        public void onCheckedChanged(RadioGroup group, int checkedId) {            switch (checkedId) {                case R.id.rb_shop:                    prePosition = 0;                    relativelayoutMain.setVisibility(View.VISIBLE);                    break;                case R.id.rb_mgz:                    prePosition = 1;                    relativelayoutMain.setVisibility(View.GONE);                    break;                case R.id.rb_daren:                    prePosition = 2;                    relativelayoutMain.setVisibility(View.GONE);                    break;                case R.id.rb_good:                    prePosition = 3;                    relativelayoutMain.setVisibility(View.GONE);                    break;                case R.id.rb_self:                    prePosition = 4;                    relativelayoutMain.setVisibility(View.GONE);                    break;            }            BaseFragment baseFragment = fragments.get(prePosition);            switchFragment(baseFragment);        }    });}

4、设置缓存，判断缓存的Fragment是否和显示的是不是同一个，如果不是，切换。
private void switchFragment(BaseFragment baseFragment) {
if (tempFragment != baseFragment) {
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
if (!baseFragment.isAdded()) {

            if (tempFragment != null) {                ft.hide(tempFragment);            }            ft.add(R.id.fl_main, baseFragment);        } else {            if (tempFragment != null) {                ft.hide(tempFragment);            }            ft.show(baseFragment);        }        ft.commit();        tempFragment = baseFragment;    }}