Android GirdView写出TabActivity而已更加具有可定制性

package com.xiaoqiu.ui;

import com.xiaoqiu.adapter.ImageAdapter;
import android.app.ActivityGroup;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.Window;
import android.view.ViewGroup.LayoutParams;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.LinearLayout;
import android.widget.AdapterView.OnItemClickListener;
/**
 * 主要是根据点最上方导航栏来决定显示哪个Activity
 * @author Tian
 *
 */
@SuppressWarnings("deprecation")
public class MainActivity extends ActivityGroup {

	private GridView gvTopBar;
	private ImageAdapter topImgAdapter;
	public LinearLayout container;// 装载sub Activity的容器

	/** 顶部按钮图片 **/
	int[] topbar_image_array = { R.drawable.frame_player_normal,
			R.drawable.frame_local_normal, R.drawable.frame_internet_normal,
			R.drawable.frame_menu_normal };

	@Override
	public void onCreate(Bundle savedInstanceState) {
		setFullscreen();
		setNoTitle();
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		initView();
	}

	private void initView()
	{
		gvTopBar = (GridView) this.findViewById(R.id.gvTopBar);
		gvTopBar.setNumColumns(topbar_image_array.length);// 设置每行列数
		gvTopBar.setSelector(new ColorDrawable(Color.TRANSPARENT));// 选中的时候为透明色
		gvTopBar.setGravity(Gravity.CENTER);// 位置居中
		gvTopBar.setVerticalSpacing(0);// 垂直间隔
		int width = this.getWindowManager().getDefaultDisplay().getWidth()
				/ topbar_image_array.length;
		topImgAdapter = new ImageAdapter(this, topbar_image_array, width, 100,
				R.drawable.frame_internet_press);
		gvTopBar.setAdapter(topImgAdapter);// 设置菜单Adapter
		gvTopBar.setOnItemClickListener(new ItemClickEvent());// 项目点击事件
		container = (LinearLayout) findViewById(R.id.Container);
		SwitchActivity(0);//默认打开第0页
	}
	
	class ItemClickEvent implements OnItemClickListener {

		public void onItemClick(AdapterView<?> parent, View view, int i,
				long l) {
			SwitchActivity(i);
		}
	}
	/**
	 * 根据ID打开指定的Activity
	 * @param id GridView选中项的序号
	 */
	void SwitchActivity(int id)
	{
		topImgAdapter.SetFocus(id);//选中项获得高亮
		container.removeAllViews();//必须先清除容器中所有的View
		Intent intent =null;
		if (id == 0 || id == 2) {
			intent = new Intent(MainActivity.this, ProfilesActivity.class);
		} else if (id == 1 || id == 3) {
			intent = new Intent(MainActivity.this, RuleActivity.class);
		} 
		intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
		//Activity 转为 View
		Window subActivity = getLocalActivityManager().startActivity(
				"subActivity", intent);
		//容器添加View
		container.addView(subActivity.getDecorView(),
				LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
	}
	
	//全屏
	 public void setFullscreen() { 
	        requestWindowFeature(Window.FEATURE_NO_TITLE); 
	        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
	                WindowManager.LayoutParams.FLAG_FULLSCREEN); 
	    } 
	    
	//无标题
	    public void setNoTitle() { 
	        requestWindowFeature(Window.FEATURE_NO_TITLE); 
	    }

}

package com.xiaoqiu.adapter;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
/**
 * 
 * @author tian
 *@version 
 */
public class ImageAdapter extends BaseAdapter{
	private Context mContext;   
    private ImageView[] imgItems;  
    private int selResId;
    
    public ImageAdapter(Context c,int[] picIds,int width,int height,int selResId)
    {
    	mContext = c;
    	this.selResId=selResId;
    	imgItems=new ImageView[picIds.length];
    	
    	for(int i=0;i<picIds.length;i++)  
        {  
            imgItems[i] = new ImageView(mContext);   
            imgItems[i].setLayoutParams(new GridView.LayoutParams(width, height));//设置ImageView宽高   
            imgItems[i].setAdjustViewBounds(false);   
            imgItems[i].setPadding(2, 2, 2, 2);   
            imgItems[i].setImageResource(picIds[i]);   
        }
    }
	@Override
	public int getCount() {
		return imgItems.length;
	}

	@Override
	public Object getItem(int position) {
		return position;
	}

	@Override
	public long getItemId(int position) {
		return position;
	}

	/**  
     * 设置选中的效果  
     * 当选中选项A 则A设置成什么样式 其余的又设置成其余的样式
     */    
    public void SetFocus(int index)    
    {    
        for(int i=0;i<imgItems.length;i++)    
        {    
            if(i!=index)    
            {    
                imgItems[i].setBackgroundResource(0);//恢复未选中的样式  
            }    
        }    
        imgItems[index].setBackgroundResource(selResId);//设置选中的样式  
    }    
    
	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		ImageView imageView;
		if (convertView == null) {
			imageView=imgItems[position];
		}else{
			imageView = (ImageView) convertView;
		}
		return imageView;
	}

}