Android 一个Activity 里面放置多个 Fragment 实现点击切换的Tab 页面效果

 // 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();
    }
}