Fragment(碎片)

主界面layout文件

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:app="http://schemas.android.com/apk/res-auto"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:id="@+id/activity_main2"
 6     android:layout_width="match_parent"
 7     android:layout_height="match_parent"
 8     android:orientation="vertical"
 9     tools:context="com.example.dbwater.myapplication.Main2Activity">
10
11     <LinearLayout
12         android:layout_width="match_parent"
13         android:layout_height="0dp"
14         android:layout_weight="1"
15         android:id="@+id/layout_fragment"
16         android:orientation="horizontal"></LinearLayout>
17     <LinearLayout
18         android:layout_width="match_parent"
19         android:layout_height="wrap_content"
20         >
21         <Button
22             android:layout_width="0dp"
23             android:layout_height="match_parent"
24             android:layout_weight="1"
25             android:text="首页"
26             android:onClick="bt1_onclick"
27             android:id="@+id/bt1"/>
28         <Button
29             android:layout_width="0dp"
30             android:layout_height="match_parent"
31             android:layout_weight="1"
32             android:text="购买"
33             android:onClick="bt1_onclick"
34             android:id="@+id/bt2"/>
35         <Button
36             android:layout_width="0dp"
37             android:layout_height="wrap_content"
38             android:layout_weight="1"
39             android:text="个人简介"
40             android:onClick="bt1_onclick"
41             android:id="@+id/bt3"/>
42     </LinearLayout>
43 </LinearLayout>

java主函数

 1 package com.example.dbwater.myapplication;
 2
 3 import android.support.v4.app.FragmentActivity;
 4 import android.support.v4.app.FragmentManager;
 5 import android.support.v7.app.AppCompatActivity;
 6 import android.os.Bundle;
 7 import android.view.View;
 8 import android.widget.Toast;
 9
10 public class Main2Activity extends FragmentActivity {
11
12     MainFragment mMainFragment;
13     BuyFragment mBuyFragment;
14     PersionFragment mPersionFragment;
15     FragmentManager mFragmentManager;
16     @Override
17     protected void onCreate(Bundle savedInstanceState) {
18         super.onCreate(savedInstanceState);
19         setContentView(R.layout.activity_main2);
20         mMainFragment=new MainFragment(getApplicationContext());
21         mFragmentManager=getSupportFragmentManager();
22         mFragmentManager.beginTransaction().add(R.id.layout_fragment,mMainFragment).commit();
23     }
24     public void bt1_onclick(View v)
25     {
26         switch (v.getId())
27         {
28             case R.id.bt1:
29                 mFragmentManager.beginTransaction().replace(R.id.layout_fragment,mMainFragment).commit();
30                 Toast.makeText(getApplicationContext(), "首页", Toast.LENGTH_SHORT).show();
31
32                 break;
33             case R.id.bt2:
34                 mBuyFragment = new BuyFragment(getApplicationContext());
35                 mFragmentManager.beginTransaction().replace(R.id.layout_fragment,mBuyFragment).commit();
36                 Toast.makeText(getApplicationContext(), "购买", Toast.LENGTH_SHORT).show();
37                 break;
38             case R.id.bt3:
39                 mPersionFragment=new PersionFragment(getApplicationContext());
40                 mFragmentManager.beginTransaction().replace(R.id.layout_fragment,mPersionFragment).commit();
41                 Toast.makeText(getApplicationContext(), "个人", Toast.LENGTH_SHORT).show();
42
43                 break;
44         }
45     }
46 }

首页Fragment的Java类：

 1 package com.example.dbwater.myapplication;
 2
 3 import android.content.Context;
 4 import android.os.Bundle;
 5 import android.support.annotation.Nullable;
 6 import android.support.v4.app.Fragment;
 7 import android.view.LayoutInflater;
 8 import android.view.View;
 9 import android.view.ViewGroup;
10
11 /**
12  * Created by Administrator on 2016/7/28.
13  */
14
15 public class MainFragment extends Fragment {
16     private Context mContext;
17     public MainFragment(Context context)
18     {
19         mContext=context;
20     }
21     @Nullable
22     @Override
23     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
24         View view=LayoutInflater.from(mContext).inflate(R.layout.fragment_main,null);
25         return super.onCreateView(inflater, container, savedInstanceState);
26     }
27 }