android中Fragment+RadioButton实现底部导航栏

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package com.nyl.shoppingmall.app.activity;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.widget.FrameLayout;
import android.widget.RadioGroup;

import com.nyl.shoppingmall.R;
import com.nyl.shoppingmall.base.BaseFragment;
import com.nyl.shoppingmall.community.fragment.CommunityFragment;
import com.nyl.shoppingmall.home.fragment.HomeFragment;
import com.nyl.shoppingmall.shoppingcart.fragment.ShoppingCartFragment;
import com.nyl.shoppingmall.type.fragment.TypeCartFragment;
import com.nyl.shoppingmall.user.fragment.UserCartFragment;

import java.util.ArrayList;

import butterknife.Bind;
import butterknife.ButterKnife;

public class MainActivity extends FragmentActivity{

  @Bind(R.id.frameLayout)
  FrameLayout frameLayout;
  @Bind(R.id.rg_main)
  RadioGroup rgMain;

  //装fragment的实例集合
  private ArrayList fragments;

  private int position = 0;

  //缓存Fragment或上次显示的Fragment
  private Fragment tempFragment;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //ButterKnife和当前Activity绑定
    ButterKnife.bind(this);

    //初始化Fragment
    initFragment();
    //设置RadioGroup的监听
    initListener();
  }

  private void initListener() {
    rgMain.check(R.id.rb_home);
    rgMain.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
      @Override
      public void onCheckedChanged(RadioGroup radioGroup, int i) {
        switch (i){
          case R.id.rb_home: //首页
            position = 0;
            break;
          case R.id.rb_type: //分类
            position = 1;
            break;
          case R.id.rb_community: //发现
            position = 2;
            break;
          case R.id.rb_cart: //购物车
            position = 3;
            break;
          case R.id.rb_user: //个人中心
            position = 4;
            break;
          default:
            position = 0;
            break;
        }
        //根据位置得到相应的Fragment
        BaseFragment baseFragment = getFragment(position);
        /**
         * 第一个参数: 上次显示的Fragment
         * 第二个参数: 当前正要显示的Fragment
         */
        switchFragment(tempFragment,baseFragment);
      }
    });
  }

  /**
   * 添加的时候按照顺序
   */
  private void initFragment(){
    fragments = new ArrayList<>();
    fragments.add(new HomeFragment());
    fragments.add(new TypeCartFragment());
    fragments.add(new CommunityFragment());
    fragments.add(new ShoppingCartFragment());
    fragments.add(new UserCartFragment());
  }

  /**
   * 根据位置得到对应的 Fragment
   * @param position
   * @return
   */
  private BaseFragment getFragment(int position){
    if(fragments != null && fragments.size()>0){
      BaseFragment baseFragment = fragments.get(position);
      return baseFragment;
    }
    return null;
  }

  /**
   * 切换Fragment
   * @param fragment
   * @param nextFragment
   */
  private void switchFragment(Fragment fragment,BaseFragment nextFragment){
    if (tempFragment != nextFragment){
      tempFragment = nextFragment;
      if (nextFragment != null){
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        //判断nextFragment是否添加成功
        if (!nextFragment.isAdded()){
          //隐藏当前的Fragment
          if (fragment != null){
            transaction.hide(fragment);
          }
          //添加Fragment
          transaction.add(R.id.frameLayout,nextFragment).commit();
        }else {
          //隐藏当前Fragment
          if (fragment != null){
            transaction.hide(fragment);
          }
          transaction.show(nextFragment).commit();
        }
      }
    }
  }
}

package com.nyl.shoppingmall.home.fragment;

import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.widget.TextView;

import com.nyl.shoppingmall.base.BaseFragment;

/**
 * 首页Fragment
 */
public class HomeFragment extends BaseFragment {

  private final static String TAG = HomeFragment.class.getSimpleName();

  private TextView textView;

  @Override
  public View initView() {
    textView = new TextView(mContext);
    textView.setGravity(Gravity.CENTER);
    textView.setTextSize(25);
    Log.e(TAG,"主页面的Fragment的UI被初始化了");
    return textView;
  }

  @Override
  public void initData() {
    super.initData();
    textView.setText("首页");
    Log.e(TAG,"主页面的Fragment的数据被初始化了");
  }
}

package com.nyl.shoppingmall.base;

import android.content.Context;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * 基类Fragment
 * 首页：HomeFragment
 * 分类：TypeFragment
 * 发现：CommunityFragment
 * 购物车：ShoppingCartFragment
 * 用户中心：UserFragment
 * 等等都要继承该类
 */

public abstract class BaseFragment extends Fragment{

  protected Context mContext;

  /**
   * 当该类被系统创建的时候回调
   * @param savedInstanceState
   */
  @Override
  public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mCOntext= getActivity();
  }

  @Nullable
  @Override
  public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    return initView();
  }

  //抽象类，由孩子实现，实现不同的效果
  public abstract View initView();

  @Override
  public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    initData();
  }

  /**
   * 当子类需要联网请求数据的时候，可以重写该方法，该方法中联网请求
   */
  public void initData() {
  }
}