切换fragment

demo源码下载：http://download.csdn.net/detail/u010778159/8643203

fragment间的切换

1. 工程有3个.java文件，4个xml文件
   
   

我们要实现的是：fragment_content2中有一个Button，而fragment
_content1中有一个TextView, 一开始MainActivity.java显示fragment_content2的内容，当点击Button之后，切换成fragment_content1的内容。

fragment_content1.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30dp"
        android:layout_gravity="center"
        android:text="这是fragment1" />

</LinearLayout>

fragment_content2.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="这是fragment2" />

</LinearLayout>

activity_main.xml:

<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" >

    <FrameLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="com.LZP.fragmenttest.MainActivity"
        tools:ignore="MergeRootFrame" >
    </FrameLayout>


</RelativeLayout>

可以看到activity_main.xml中有一个FrameLayout,这个就是fragment的容器

ContentFragment.java:

package com.LZP.fragment_change;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.Toast;

public class ContentFragment extends Fragment {
    private Button send2;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        View view = inflater.inflate(R.layout.fragment_content1, container, false);  

        return view;
    }
}

ContentFragment2.java:

package com.LZP.fragment_change;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.Toast;

public class ContentFragment2 extends Fragment {
    private Button button;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        View view = inflater.inflate(R.layout.fragment_content2, container, false);  
        button=(Button)view.findViewById(R.id.button1);
        button.setOnClickListener(new OnClickListener() {
            //按钮点击响应事件
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                FragmentManager fm = getActivity().getSupportFragmentManager();
                ContentFragment fragment=new ContentFragment();
                android.support.v4.app.FragmentTransaction ft = fm.beginTransaction();
                //container是activity_main.xml中的FrameLayout的ID，用来放置Fragment
                ft.replace(R.id.container, fragment);
                ft.commit();
            }
        });
        return view;
    }
}

MainActivity.java:

public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        FragmentManager fm = getSupportFragmentManager();
        ContentFragment2 fragment=new ContentFragment2();

        android.support.v4.app.FragmentTransaction ft = fm.beginTransaction();
        ft.add(R.id.container, fragment);
        ft.commit();

        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment()).commit();
        }
    }