Fragment   实现的 分类 效果

布局文件的信息：

<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:orientation="vertical"

    android:layout_margin="0dp"

    android:background="#fffef9"

    tools:context=".MianActivity" >

	<!-- 1  替换的Fragment的内容！ -->

    <LinearLayout

        android:id="@+id/contentfragment"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_weight="1"

        android:orientation="vertical" >

    </LinearLayout>

    <!-- 2  底部的菜单 -->

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:gravity="bottom"

        android:layout_margin="0dp"

        android:layout_gravity="bottom"

        android:orientation="horizontal" >

        <Button

            android:id="@+id/articalmenu"

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:layout_margin="0dp"

            android:layout_weight="1"

            android:text="文章"

            />

        <Button

            android:id="@+id/forummenu"

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:layout_weight="1"

            android:layout_margin="0dp"

            android:text="论坛"

            />

        <Button

            android:id="@+id/gamemenu"

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:layout_weight="1"

            android:layout_margin="0dp"

            android:text="游戏"

            />

    </LinearLayout>

</LinearLayout>

Activity  代码：

package stu.love.game;

import stu.love.artical.ArticalListFragment;

import stu.love.forum.ForumFragment;

import stu.love.utils.ImageCacheSDUtils;

import android.app.ActivityManager;

import android.content.Context;

import android.graphics.Bitmap;

import android.os.Bundle;

import android.support.v4.app.FragmentActivity;

import android.support.v4.app.FragmentManager;

import android.support.v4.app.FragmentTransaction;

import android.util.Log;

import android.util.LruCache;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.Window;

import android.widget.Button;

import com.android.volley.RequestQueue;

import com.android.volley.toolbox.ImageLoader.ImageCache;

import com.android.volley.toolbox.Volley;

/**

 * 3DM game 程序的 入口 測试类！

*

 * */

public class MianActivity extends FragmentActivity implements OnClickListener {

	private static String Tag= "MianActivity";

	// 菜单选项

	private Button articlemenu;

	private Button forummenu;

	private Button gamemenu;

//	图片缓冲

	public RequestQueue queue;

	public ImageCache imageCache;

	public LruCache<String, Bitmap> lruCache;

	public Context context;

	// fragment

	private FragmentManager manager;

	private FragmentTransaction transaction;

	private ArticalListFragment articalListFragment;

	private ForumFragment forumFrgment;

	private GameFragment gameFragment;

	public MianActivity() {

		super();

	}

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		getWindow().requestFeature(Window.FEATURE_PROGRESS);

		setContentView(R.layout.activity_mian);

//		1 初始化组件

		initComponet();

//		2  初始化 frgment

		manager = getSupportFragmentManager();

		initArticalListFragment();

	}

	@Override

	protected void onResume() {

		// TODO Auto-generated method stub

		super.onResume();

	}

	/**

	 * 1 初始化组件

	 *

	 * */

	private void initComponet() {

		articlemenu = (Button) this.findViewById(R.id.articalmenu);

		forummenu = (Button) this.findViewById(R.id.forummenu);

		gamemenu = (Button) this.findViewById(R.id.gamemenu);

		articlemenu.setOnClickListener(this);

		forummenu.setOnClickListener(this);

		gamemenu.setOnClickListener(this);

		/**

		 * 		1	开启异步任务 去下载数据！

* 			使用Volley框架！

		 *    		内部封装好了 异步任务！

		 *  		获取到数据之后 才干 设置 适配器！

					自己定义Adapter

		 * */

//		获取请求队列

		context = getApplicationContext();

		queue = Volley.newRequestQueue(context);

		//获得系统的动态的剩余内存空间

		int memClass = ((ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE))

						.getMemoryClass();

		//获取剩余的内存空间的/8

		final int cacheSize = 1024 * 1024 * memClass / 8;

//		设置缓存的空间大小！

lruCache = new LruCache<String, Bitmap>(cacheSize);

//		初始化 图片的缓存！

		imageCache = new ImageCache() {

			public void putBitmap(String url, Bitmap bitmap) {

					// TODO Auto-generated method stub

					//设置缓存的路径

					Log.i(Tag, "---  一级缓存  存入图片");

					lruCache.put(url, bitmap);

					if(ImageCacheSDUtils.getInstance().getBitmapData(url)== null)

					{

						byte[] data = ImageCacheSDUtils.getInstance().BitmapToByte(bitmap);

						Log.i(Tag, "---  二级缓存  存入图片");

						ImageCacheSDUtils.getInstance().putBitmapData(url, data);

					}

			}

			public Bitmap getBitmap(String url) {

					// TODO Auto-generated method stub

					Log.i(Tag, "---	 一级缓存 取出图");

					Bitmap bitmap = lruCache.get(url);

					return bitmap;

			}

		};

	}

	/**

	 * 2 事件的响应 替换 Fragment2 事件的响应 替换 Fragment

	 */

	@Override

	public void onClick(View v) {

		// TODO Auto-generated method stub

		transaction = manager.beginTransaction();

		switch (v.getId()) {

		case R.id.articalmenu:

			if (articalListFragment == null)

				articalListFragment = new ArticalListFragment(queue, imageCache, lruCache, context);

				transaction.replace(R.id.contentfragment, articalListFragment,"articalListFragment");

				transaction.addToBackStack("articalListFragment");

			break;

		case R.id.forummenu:

			if (forumFrgment == null)

				forumFrgment = new ForumFragment();

				transaction.replace(R.id.contentfragment, forumFrgment,"forumFrgment");

				transaction.addToBackStack("forumFrgment");

			break;

		case R.id.gamemenu:

			if (gameFragment == null)

				gameFragment = new GameFragment(queue, imageCache, lruCache, context);

				transaction.replace(R.id.contentfragment, gameFragment,"gameFragment");

				transaction.addToBackStack("gameFragment");

			break;

		}

//		fragment 的替换！

		transaction.commit();

	}

//	3 初始化 Fragment  第一次载入的时候数据！

	public void initArticalListFragment()

	{

		transaction = manager.beginTransaction();

		articalListFragment = new ArticalListFragment(queue, imageCache, lruCache, context);

		transaction.add(R.id.contentfragment, articalListFragment,"articalListFragment");

		transaction.addToBackStack("articalListFragment");

//		由于这里 ，没有 commit 所以 不能show data!

		transaction.commit();

	}

	@Override

	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.

		getMenuInflater().inflate(R.menu.mian, menu);

		return true;

	}

}