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{  //定義5個fragment  private MyFragment f1;  private MyFragment2 f2;  private MyFragment3 f3;  private MyFragment4 f4;  private MyFragment5 f5;  //定義底部5個按鈕  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);//注冊按鈕    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);//對按鈕設置監聽    foot2.setOnClickListener(this);    foot3.setOnClickListener(this);    foot4.setOnClickListener(this);    foot5.setOnClickListener(this);    //第一次初始化首頁默認顯示第一個fragment    initFragment1();  }   //顯示第一個fragment  private void initFragment1(){    //開啟事務，fragment的控制是由事務來實現的    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();     //第一種方式（add），初始化fragment并添加到事務中，如果為null就new一個    if(f1 == null){      f1 = new MyFragment();      transaction.add(R.id.main_frame_layout, f1);    }    //隱藏所有fragment    hideFragment(transaction);    //顯示需要顯示的fragment    transaction.show(f1);     //第二種方式(replace)，初始化fragment//    if(f1 == null){//      f1 = new MyFragment("首頁");//    }//    transaction.replace(R.id.main_frame_layout, f1);     //提交事務    transaction.commit();  }   //顯示第二個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("分類");//    }//    transaction.replace(R.id.main_frame_layout, f2);     transaction.commit();  }   //顯示第三個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("發現");//    }//    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("購物車");//    }//    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();  }   //隱藏所有的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) {//點擊哪個按鈕就顯示哪個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;                                         //自己創建一個xml.  } }