Fragment(碎片)

主界面layout文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.example.administrator.myapplication.MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="vertical"
        android:id="@+id/layou_fragment"></LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <Button
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text="首页"
            android:id="@+id/bt_1"
            android:onClick="bt1_onClick"/>
        <Button
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text="购买"
            android:id="@+id/bt_2"
            android:onClick="bt1_onClick"/>
        <Button
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text="我的"
            android:id="@+id/bt_3"
            android:onClick="bt1_onClick"/>
    </LinearLayout>
</LinearLayout>

java主函数

package com.example.administrator.myapplication;


import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.example.administrator.myapplication.com.db.fragment.BuyFragment;
import com.example.administrator.myapplication.com.db.fragment.MainFragment;
import com.example.administrator.myapplication.com.db.fragment.PersonFragment;

public class MainActivity extends FragmentActivity {
    Button bt_1;
    Button bt_2;
    Button bt_3;
    MainFragment mMainFragment;
    BuyFragment mBuyFragment;
    PersonFragment mPersonFragment;
    FragmentManager mFragmentManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mMainFragment=new MainFragment(getApplicationContext());
        mFragmentManager=getSupportFragmentManager();
        mFragmentManager.beginTransaction().add(R.id.layou_fragment,mMainFragment).commit();

    }
    public void bt1_onClick(View view)
    {
        switch (view.getId())
        {
            case R.id.bt_1:
                mMainFragment=new MainFragment(getApplicationContext());
                mFragmentManager.beginTransaction().replace(R.id.layou_fragment,mMainFragment).commit();
                Toast.makeText(MainActivity.this, "首页", Toast.LENGTH_SHORT).show();
                break;
            case R.id.bt_2:
                mBuyFragment=new BuyFragment(getApplication());
                mFragmentManager.beginTransaction().replace(R.id.layou_fragment,mBuyFragment).commit();
                Toast.makeText(MainActivity.this, "购买", Toast.LENGTH_SHORT).show();
                break;
            case R.id.bt_3:
                mPersonFragment=new PersonFragment(getApplicationContext());
                mFragmentManager.beginTransaction().replace(R.id.layou_fragment,mPersonFragment).commit();
                Toast.makeText(MainActivity.this, "个人", Toast.LENGTH_SHORT).show();
                break;
        }
    }
}

首页Fragment的Java类：

package com.example.administrator.myapplication.com.db.fragment;


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;

import com.example.administrator.myapplication.R;

/**
 * Created by Administrator on 2016/8/9.
 */
public class MainFragment extends Fragment {
    private Context mContext;
    public MainFragment(Context context)
    {
        mContext=context;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view=LayoutInflater.from(mContext).inflate(R.layout.fragment_main,null);
        return view;
    }
}

购买Fragment的Java类：

package com.example.administrator.myapplication.com.db.fragment;


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;

import com.example.administrator.myapplication.R;

/**
 * Created by Administrator on 2016/8/9.
 */
public class BuyFragment extends Fragment {
    private Context mContext;
    public BuyFragment(Context context)
    {
        mContext=context;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
       View view=LayoutInflater.from(mContext).inflate(R.layout.fragment_buy,null);
        return view;
    }
}

个人Fragment的Java类：

package com.example.administrator.myapplication.com.db.fragment;


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;

import com.example.administrator.myapplication.R;

/**
 * Created by Administrator on 2016/8/9.
 */
public class PersonFragment extends Fragment {
    private Context mContext;
    public PersonFragment(Context context)
    {
        mContext=context;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view=LayoutInflater.from(mContext).inflate(R.layout.fragment_person,null);
        return view;
    }
}