MainActivity：

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package com.example.fragmentmanage;

import android.app.Activity;

import android.app.FragmentManager;

import android.app.FragmentTransaction;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener {

private Button btn1;

private Button btn2;

private FirstFragment firstFragment;

private SencondFragment sencondFragment;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initView();

setDefaultFragment();

}

private void initView() {

btn1 = (Button) findViewById(R.id.btn1);

btn2 = (Button) findViewById(R.id.btn2);

btn1.setOnClickListener(this);

btn2.setOnClickListener(this);

}

private void setDefaultFragment() {

FragmentManager manager = getFragmentManager();

FragmentTransaction transaction = manager.beginTransaction();

firstFragment = new FirstFragment();

transaction.replace(R.id.fragme_layout, firstFragment);

transaction.commit();

}

@Override

public void onClick(View arg0) {

FragmentManager manager = getFragmentManager();

FragmentTransaction transaction = manager.beginTransaction();

switch (arg0.getId()) {

case R.id.btn1:

if (firstFragment == null) {

firstFragment = new FirstFragment();

}

transaction.replace(R.id.fragme_layout, firstFragment);

break;

case R.id.btn2:

if (sencondFragment == null) {

sencondFragment = new SencondFragment();

}

transaction.replace(R.id.fragme_layout, sencondFragment);

break;

default:

break;

}

transaction.commit();

}

}

activity_main：

<RelativeLayout 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"

    tools:context=".MainActivity" >

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal" >

        <Button

            android:id="@+id/btn1"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="btn1" />

        <Button

            android:id="@+id/btn2"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="btn2" />

    </LinearLayout>

    <FrameLayout

        android:id="@+id/fragme_layout"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" />

</RelativeLayout>

FirstFragment：

package com.example.fragmentmanage;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

public class FirstFragment extends Fragment {

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

return inflater.inflate(R.layout.fragment_first, null);

}

}

SencondFragment：

package com.example.fragmentmanage;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

public class FirstFragment extends Fragment {

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

return inflater.inflate(R.layout.fragment_first, null);

}

}

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