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   源码介绍

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package cn.xxs.horizontalgridview.activity;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import cn.xxs.horizontalgridview.adapter.AppAdapter;
import cn.xxs.horizontalgridview.adapter.MyViewPagerAdapter;
import cn.xxs.horizontalgridview.control.PageControl;

/**
 * 实现横向滑动的GridView
 * 
 * @author xxs
 */
public class MainActivity extends Activity {
	private static final float APP_PAGE_SIZE = 8.0f;
	private MyViewPagerAdapter adapter;
	private ViewPager viewPager;
	LayoutInflater inflater;

	private PageControl pageControl;

	private Map<Integer, GridView> map;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		inflater = getLayoutInflater();

		// setContentView(R.layout.activity_main);
		ViewGroup main = (ViewGroup) inflater.inflate(R.layout.activity_main,
				null);
		initViews();
		viewPager = (ViewPager) findViewById(R.id.myviewpager);
		adapter = new MyViewPagerAdapter(this, map);
		viewPager.setAdapter(adapter);
		viewPager.setOnPageChangeListener(new MyListener());

	}

	/**
	 * 获取系统所有的应用程序，并根据APP_PAGE_SIZE生成相应的GridView页面
	 */
	public void initViews() {
		final PackageManager packageManager = getPackageManager();
		final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
		mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
		// get all apps
		final List<ResolveInfo> apps = packageManager.queryIntentActivities(
				mainIntent, 0);
		// the total pages
		final int PageCount = (int) Math.ceil(apps.size() / APP_PAGE_SIZE);
	
		map = new HashMap<Integer, GridView>();
		for (int i = 0; i < PageCount; i  ) {
			GridView appPage = new GridView(this);
			final AppAdapter adapter =new AppAdapter(this, apps, i);
			appPage.setAdapter(adapter);
			appPage.setNumColumns(4);
//			appPage.setOnItemClickListener(new OnItemClickListener() {
//
//				@Override
//				public void onItemClick(AdapterView<?> arg0, View arg1,
//						int arg2, long arg3) {
//					// TODO Auto-generated method stub
//		          Toast.makeText(MainActivity.this, "这是第" ((adapter.getPage()*8) arg2) "个", Toast.LENGTH_LONG).show();
//		          
//		          
//				}
//			});
			appPage.setOnItemClickListener(adapter);
			map.put(i, appPage);

		}

		ViewGroup main = (ViewGroup) inflater.inflate(R.layout.activity_main,
				null);
		// group是R.layou.main中的负责包裹小圆点的LinearLayout.
		ViewGroup group = (ViewGroup) main.findViewById(R.id.viewGroup);
		pageControl = new PageControl(this, (LinearLayout) group, PageCount);
		setContentView(main);
	}

	class MyListener implements OnPageChangeListener {

		@Override
		public void onPageScrollStateChanged(int arg0) {
			// TODO Auto-generated method stub

		}

		@Override
		public void onPageScrolled(int arg0, float arg1, int arg2) {
			// TODO Auto-generated method stub

		}

		@Override
		public void onPageSelected(int arg0) {

			pageControl.selectPage(arg0);
		}

	}
}