Fragment 小例子

详情请看：http://blog.csdn.net/lmj623565791/article/details/37970961

Fragment的两种写法：

 一种是：静态的使用Fragment

　　这是使用Fragment最简单的一种方式，把Fragment当成普通的控件，直接写在Activity的布局文件中

　　1、继承Fragment，重写onCreateView决定Fragemnt的布局

　　2、在Activity中声明此Fragment，就当和普通的View一样

<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" >

    <fragment
        android:id="@+id/id_fragment_title"
        android:name="com.zhy.zhy_fragments.TitleFragment"
        android:layout_width="fill_parent"
        android:layout_height="45dp" />

    <fragment
        android:layout_below="@id/id_fragment_title"
        android:id="@+id/id_fragment_content"
        android:name="com.zhy.zhy_fragments.ContentFragment"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</RelativeLayout>

一种是：动态的使用Fragment

<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" >

    <fragment
        android:id="@+id/id_fragment_title"
        android:name="com.zhy.zhy_fragments.TitleFragment"
        android:layout_width="fill_parent"
        android:layout_height="45dp" />

    <include
        android:id="@+id/id_ly_bottombar"
        android:layout_width="fill_parent"
        android:layout_height="55dp"
        android:layout_alignParentBottom="true"
        layout="@layout/bottombar" />

    <FrameLayout
        android:id="@+id/id_content"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_above="@id/id_ly_bottombar"
        android:layout_below="@id/id_fragment_title" />

</RelativeLayout>

MainActivity.java

package com.zhy.zhy_fragments;

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.view.Window;
import android.widget.LinearLayout;

public class MainActivity extends Activity implements OnClickListener
{
    private LinearLayout mTabWeixin;
    private LinearLayout mTabFriend;

    private ContentFragment mWeixin;
    private FriendFragment mFriend;

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

        // 初始化控件和声明事件
        mTabWeixin = (LinearLayout) findViewById(R.id.tab_bottom_weixin);
        mTabFriend = (LinearLayout) findViewById(R.id.tab_bottom_friend);
        mTabWeixin.setOnClickListener(this);
        mTabFriend.setOnClickListener(this);

        // 设置默认的Fragment
        setDefaultFragment();
    }

    private void setDefaultFragment()
    {
        FragmentManager fm = getFragmentManager();
        FragmentTransaction transaction = fm.beginTransaction();
        mWeixin = new ContentFragment();
        transaction.replace(R.id.id_content, mWeixin);
        transaction.commit();
    }

    @Override
    public void onClick(View v)
    {
        FragmentManager fm = getFragmentManager();
        // 开启Fragment事务
        FragmentTransaction transaction = fm.beginTransaction();

        switch (v.getId())
        {
        case R.id.tab_bottom_weixin:
            if (mWeixin == null)
            {
                mWeixin = new ContentFragment();
            }
            // 使用当前Fragment的布局替代id_content的控件
            transaction.replace(R.id.id_content, mWeixin);
            break;
        case R.id.tab_bottom_friend:
            if (mFriend == null)
            {
                mFriend = new FriendFragment();
            }
            transaction.replace(R.id.id_content, mFriend);
            break;
        }
        // transaction.addToBackStack();
        // 事务提交
        transaction.commit();
    }

}