十一、主页fragment

深藏阁楼爱情的钟 2022-09-25 05:15 128阅读 0赞

主界面我使用一个MainActivity来控制，4个tab页面分别采用4个fragment来切换，这样每个页面都是单独的存在，逻辑也是相互独立的。

定义一个基类fragment，所有的fragment都继承自它：

public class BaseFragment extends Fragment{
    
        protected View view;
    
        public void setMTATag(String tag) {
            StatConfig.setDebugEnable(BuildConfig.DEBUG_MODE);
            StatService.trackCustomEvent(getActivity(), tag, "");
        }
    
        public void showToast(String msg) {
            KengToast.show(msg);
        }
    
        public void showToast(int resId) {
            KengToast.show(resId);
        }
    
    }

主页fragment：

public class HomeFragment extends BaseFragment{
    
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setMTATag("HomeFragment");
        }
    
        @Nullable
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            if (view == null) {
                view = inflater.inflate(R.layout.fragment_home, container, false);
            }
            return view;
        }
    }

布局文件就不写了，没有内容。

在MainActivity去控制fragment的显示与隐藏：

private HomeFragment mHomeFragment;
    
        // tab改变回调
        private KengTabHost.KengTabListener kengTabListener = new KengTabHost.KengTabListener() {
            @Override
            public void onTabChanged(int position) {
                switch (position) {
                    case POS_HOME:
                        if (mHomeFragment == null) {
                            mHomeFragment = (HomeFragment) getSupportFragmentManager().findFragmentByTag("HomeFragment");
                            if (mHomeFragment == null) {
                                mHomeFragment = new HomeFragment();
                                getSupportFragmentManager().beginTransaction().add(R.id.fl_content, mHomeFragment, "HomeFragment").commit();
                            }
                            showFragment(mHomeFragment);
                        }
                        break;
                    case POS_CONTACT:
                        break;
                    case POS_DYNAMIC:
                        break;
                    case POS_ME:
                        break;
                }
            }
        };
    
        private void showFragment(Fragment fragment) {
            FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
            if (currentFragment != null) {
                // 隐藏当前fragment
                transaction.hide(currentFragment);
            }
            currentFragment = fragment;
            transaction.show(mHomeFragment);
            transaction.commit();
        }

当点击主界面底部的tab时，就要切换fragment，隐藏上一个fragment，显示选中的fragment。

参考：

[http://blog.csdn.net/lmj623565791/article/details/37970961][http_blog.csdn.net_lmj623565791_article_details_37970961]

[http_blog.csdn.net_lmj623565791_article_details_37970961]: http://blog.csdn.net/lmj623565791/article/details/37970961