// 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fragmentprivate FragmentManager fm;private HomeFragment mHomeFragment;private Fragment mCommonFragmentOne;private MessageFragment mMessageFragment;private MineFragment mMineFragment;private Fragment mCurrent;@Overrideprotected 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FragmentmHomeFragment = 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fragmentprivate void hideFragment(Fragment fragment, FragmentTransaction ft) {if (fragment != null) {ft.hide(fragment);}}@Overridepublic 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fragmenthideFragment(mCommonFragmentOne, fragmentTransaction);hideFragment(mMessageFragment, fragmentTransaction);hideFragment(mMineFragment, fragmentTransaction);if (mHomeFragment == null) {                    //添加一个新的fragmentmHomeFragment = new HomeFragment();fragmentTransaction.add(R.id.content_layout, mHomeFragment);} else {                   // 显示当前fragmentmCurrent = 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();}
}