android实现点击按钮切换不同的fragment布局

package com.example.xh.twostylefragment;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
 
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
 //定义5个fragment
 private MyFragment f1;
 private MyFragment2 f2;
 private MyFragment3 f3;
 private MyFragment4 f4;
 private MyFragment5 f5;
 //定义底部5个按钮
 private Button foot1;
 private Button foot2;
 private Button foot3;
 private Button foot4;
 private Button foot5;
 int i = 0;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
 
  foot1 = (Button) findViewById(R.id.btn1);//注册按钮
  foot2 = (Button) findViewById(R.id.btn2);
  foot3 = (Button) findViewById(R.id.btn3);
  foot4 = (Button) findViewById(R.id.btn4);
  foot5 = (Button) findViewById(R.id.btn5);
  foot1.setOnClickListener(this);//对按钮设置监听
  foot2.setOnClickListener(this);
  foot3.setOnClickListener(this);
  foot4.setOnClickListener(this);
  foot5.setOnClickListener(this);
  //第一次初始化首页默认显示第一个fragment
  initFragment1();
 }
 
 //显示第一个fragment
 private void initFragment1(){
  //开启事务，fragment的控制是由事务来实现的
  FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
 
  //第一种方式（add），初始化fragment并添加到事务中，如果为null就new一个
  if(f1 == null){
   f1 = new MyFragment();
   transaction.add(R.id.main_frame_layout, f1);
  }
  //隐藏所有fragment
  hideFragment(transaction);
  //显示需要显示的fragment
  transaction.show(f1);
 
  //第二种方式(replace)，初始化fragment
//  if(f1 == null){
//   f1 = new MyFragment("首页");
//  }
//  transaction.replace(R.id.main_frame_layout, f1);
 
  //提交事务
  transaction.commit();
 }
 
 //显示第二个fragment
 private void initFragment2(){
  FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
 
  if(f2 == null){
   f2 = new MyFragment2();
   transaction.add(R.id.main_frame_layout,f2);
  }
  hideFragment(transaction);
  transaction.show(f2);
 
//  if(f2 == null) {
//   f2 = new MyFragment("分类");
//  }
//  transaction.replace(R.id.main_frame_layout, f2);
 
  transaction.commit();
 }
 
 //显示第三个fragment
 private void initFragment3(){
  FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
 
  if(f3 == null){
   f3 = new MyFragment3();
   transaction.add(R.id.main_frame_layout,f3);
  }
  hideFragment(transaction);
  transaction.show(f3);
 
//  if(f3 == null) {
//   f3 = new MyFragment("发现");
//  }
//  transaction.replace(R.id.main_frame_layout, f3);
 
  transaction.commit();
 }
 private void initFragment4(){
  FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
 
  if(f4 == null){
   f4 = new MyFragment4();
   transaction.add(R.id.main_frame_layout,f4);
  }
  hideFragment(transaction);
  transaction.show(f4);
 
//  if(f4 == null) {
//   f4 = new MyFragment("购物车");
//  }
//  transaction.replace(R.id.main_frame_layout, f4);
 
  transaction.commit();
 }
 private void initFragment5(){
  FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
 
  if(f5 == null){
   f5 = new MyFragment5();
   transaction.add(R.id.main_frame_layout,f5);
  }
  hideFragment(transaction);
  transaction.show(f5);
 
//  if(f5 == null) {
//   f5 = new MyFragment("我的);
//  }
//  transaction.replace(R.id.main_frame_layout, f5);
 
  transaction.commit();
 }
 
 //隐藏所有的fragment
 private void hideFragment(FragmentTransaction transaction){
  if(f1 != null){
   transaction.hide(f1);
  }
  if(f2 != null){
   transaction.hide(f2);
  }
  if(f3 != null){
   transaction.hide(f3);
  }
  if(f4 != null){
   transaction.hide(f4);
  }
  if(f5 != null){
   transaction.hide(f5);
  }
 }
 
 @Override
 public void onClick(View v) {//点击哪个按钮就显示哪个fragment;
  if(v == foot1){
   initFragment1();
  }else if(v == foot2){
   initFragment2();
  }else if(v == foot3){
   initFragment3();
  }else if(v == foot4){
   initFragment4();
  }else if(v == foot5){
   initFragment5();
  }
 }
}

package com.example.xh.twostylefragment;
 
  import android.os.Bundle;
  import android.support.v4.app.Fragment;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
 
/**
 * Created by Administrator on 2016/7/8.
 */
public class MyFragment4 extends Fragment {
 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  View view = LayoutInflater.from(getActivity()).inflate(R.layout.shoppingcar,container,false);//用view保存shoppingcar.xml布局，大家可以
  return view;                     //自己创建一个xml.
 }
 
}