// BaseActivity 是实现的一些公共的变量和方法，可以暂时为空的类

public class HomeActivity extends BaseActivity implements View.OnClickListener {

   
    // 下面的四个按钮

    private TextView mHomeView;

    private TextView mPondView;

    private TextView mMessageView;

    private TextView mMineView;

    // 相对布局的 layout 里面装着2个textView 分别放着 图标和文字

    private RelativeLayout mHomeLayout;

    private RelativeLayout mPondLayout;

    private RelativeLayout mMessageLayout;

    private RelativeLayout mMineLayout;

    // 声明fragmentManager 和四个fragment 以及当前的fragment

    private FragmentManager fm;

    private HomeFragment mHomeFragment;

    private Fragment mCommonFragmentOne;

    private MessageFragment mMessageFragment;

    private MineFragment mMineFragment;

    private Fragment mCurrent;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_home_layout);
　　     // 初始化控件变量

        initView();
        // 创建首页的Fragment

        mHomeFragment = new HomeFragment();
        // 得到fragment 管理器，Activity 基类里面定义的

        fm = getFragmentManager();


        FragmentTransaction fragmentTransaction = fm.beginTransaction();
        // 使用homeFragment 替换 content_layout 布局

        fragmentTransaction.replace(R.id.content_layout, mHomeFragment);

        fragmentTransaction.commit();

    }

    private void initView() {
        // 先初始化layout 并赋值其点击的方法

        mHomeLayout = (RelativeLayout) findViewById(R.id.home_layout_view);

        mHomeLayout.setOnClickListener(this);

        mPondLayout = (RelativeLayout) findViewById(R.id.pond_layout_view);

        mPondLayout.setOnClickListener(this);

        mMessageLayout = (RelativeLayout) findViewById(R.id.message_layout_view);

        mMessageLayout.setOnClickListener(this);

        mMineLayout = (RelativeLayout) findViewById(R.id.mine_layout_view);

        mMineLayout.setOnClickListener(this);
        // 再初始化里面的textView 因为点击的时候要给textView的背景换一张图片 
        // 注意这里面用了一个空的TextView，背景是一个图标，点击时换的就是这个图标

        mHomeView = (TextView) findViewById(R.id.home_image_view);

        mPondView = (TextView) findViewById(R.id.fish_image_view);

        mMessageView = (TextView) findViewById(R.id.message_image_view);

        mMineView = (TextView) findViewById(R.id.mine_image_view);

        mHomeView.setBackgroundResource(R.drawable.comui_tab_home_selected);

    }

    // 使用 fragmentTransaction 隐藏fragment

    private void hideFragment(Fragment fragment, FragmentTransaction ft) {

        if (fragment != null) {

            ft.hide(fragment);

        }

    }

    @Override

    public void onClick(View v) {

        FragmentTransaction fragmentTransaction = fm.beginTransaction();

        switch (v.getId()) {

            case R.id.home_layout_view:

                // 非必须，可以删除掉
                changeStatusBarColor(R.color.color_fed952);
                // 更改背景图片

                mHomeView.setBackgroundResource(R.drawable.comui_tab_home_selected);

                mPondView.setBackgroundResource(R.drawable.comui_tab_pond);

                mMessageView.setBackgroundResource(R.drawable.comui_tab_message);

                mMineView.setBackgroundResource(R.drawable.comui_tab_person);

                // 隐藏其他fragment

                hideFragment(mCommonFragmentOne, fragmentTransaction);

                hideFragment(mMessageFragment, fragmentTransaction);

                hideFragment(mMineFragment, fragmentTransaction);

                if (mHomeFragment == null) {
                    //添加一个新的fragment

                    mHomeFragment = new HomeFragment();

                    fragmentTransaction.add(R.id.content_layout, mHomeFragment);

                } else {
                   // 显示当前fragment

                    mCurrent = mHomeFragment;

                    fragmentTransaction.show(mHomeFragment);

                }

                break;

            case R.id.message_layout_view:

                changeStatusBarColor(R.color.color_e3e3e3);

                mMessageView.setBackgroundResource(R.drawable.comui_tab_message_selected);

                mHomeView.setBackgroundResource(R.drawable.comui_tab_home);

                mPondView.setBackgroundResource(R.drawable.comui_tab_pond);

                mMineView.setBackgroundResource(R.drawable.comui_tab_person);

                hideFragment(mCommonFragmentOne, fragmentTransaction);

                hideFragment(mHomeFragment, fragmentTransaction);

                hideFragment(mMineFragment, fragmentTransaction);

                if (mMessageFragment == null) {

                    mMessageFragment = new MessageFragment();

                    fragmentTransaction.add(R.id.content_layout, mMessageFragment);

                } else {

                    mCurrent = mMessageFragment;

                    fragmentTransaction.show(mMessageFragment);

                }

                break;

            case R.id.mine_layout_view:

                changeStatusBarColor(R.color.color_00ffffff);

                mMineView.setBackgroundResource(R.drawable.comui_tab_person_selected);

                mHomeView.setBackgroundResource(R.drawable.comui_tab_home);

                mPondView.setBackgroundResource(R.drawable.comui_tab_pond);

                mMessageView.setBackgroundResource(R.drawable.comui_tab_message);

                hideFragment(mCommonFragmentOne, fragmentTransaction);

                hideFragment(mMessageFragment, fragmentTransaction);

                hideFragment(mHomeFragment, fragmentTransaction);

                if (mMineFragment == null) {

                    mMineFragment = new MineFragment();

                    fragmentTransaction.add(R.id.content_layout, mMineFragment);

                } else {

                    mCurrent = mMineFragment;

                    fragmentTransaction.show(mMineFragment);

                }

                break;

        }

        fragmentTransaction.commit();

    }

}