MainView.java

package com.cnblogs.android;
import com.cnblogs.android.ui.tab1.BlogListView;

import android.app.TabActivity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.os.Bundle;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.TabHost;
import android.widget.CompoundButton.OnCheckedChangeListener;
/**
 * ��Activity������5��Tab
 * @author walkingp
 * @date:2011-12
 *
 */
public class MainView extends TabActivity
		implements
			OnCheckedChangeListener {
	/** Called when the activity is first created. */
	private TabHost tabHost;
	private Intent intentBlog;// Blog
	private Intent intentNews;// News
	private Intent intentSearch;// search
	private Intent intentRss;// RSS
	private Intent intentMore;// More

	private RadioButton rbBlog;
	private RadioButton rbNews;
	private RadioButton rbRss;
	private RadioButton rbSearch;
	private RadioButton rbMore;

    public String whichTab = "";// ��ǰѡ��Tab

	Resources res;// ��Դ
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		res = this.getResources();

		intentBlog = new Intent(this, BlogListView.class);
		intentNews = new Intent(this, NewsActivity.class);
		intentRss = new Intent(this, MyRssActivity.class);
		intentSearch = new Intent(this, SearchActivity.class);
		intentMore = new Intent(this, MoreActivity.class);

		InitialRadios();
		InitialTab();
		InitialSelectedTab();
	}
	/**
	 * ��ʼ����ѡ��ť
	 */
	private void InitialRadios() {
		rbBlog = (RadioButton) findViewById(R.id.TabBlog);
		rbBlog.setOnCheckedChangeListener(this);
		rbNews = (RadioButton) findViewById(R.id.TabNews);
		rbNews.setOnCheckedChangeListener(this);
		rbRss = (RadioButton) findViewById(R.id.TabRss);
		rbRss.setOnCheckedChangeListener(this);
		rbSearch = (RadioButton) findViewById(R.id.TabSearch);
		rbSearch.setOnCheckedChangeListener(this);
		rbMore = (RadioButton) findViewById(R.id.TabMore);
		rbMore.setOnCheckedChangeListener(this);
	}
	/**
	 * ��ʼ��Tab
	 */
	private void InitialTab() {
		tabHost = this.getTabHost();

		// tabHost.addTab(buildTabSpec("search", R.string.main_search,
		// R.drawable.icon, intentSearch));//fix tabHost bug:set the first tab
		// as default tab
		tabHost.addTab(buildTabSpec("blog", R.string.main_home,
				R.drawable.icon, intentBlog));
		tabHost.addTab(buildTabSpec("news", R.string.main_news,
				R.drawable.icon, intentNews));
		tabHost.addTab(buildTabSpec("rss", R.string.main_rss, R.drawable.icon,
				intentRss));
		tabHost.addTab(buildTabSpec("search", R.string.main_search,
				R.drawable.icon, intentSearch));
		tabHost.addTab(buildTabSpec("more", R.string.main_more,
				R.drawable.icon, intentMore));
	}
	/**
	 * ����Ĭ��ѡ��Tab
	 */
	private void InitialSelectedTab() {
		SharedPreferences settings = getSharedPreferences(res.getString(R.string.preferences_key), MODE_PRIVATE);
		whichTab = settings.getString(res.getString(R.string.preferences_current_tab), "blog");
		if (whichTab.equals("blog"))
			rbBlog.setChecked(true);
		else if (whichTab.equals("news"))
			rbNews.setChecked(true);
		else if (whichTab.equals("rss"))
			rbRss.setChecked(true);
		else if (whichTab.equals("search"))
			rbSearch.setChecked(true);
		else if (whichTab.equals("more"))
			rbMore.setChecked(true);
	}
	/**
	 * ���ó�ʼ��Tab
	 */
	private TabHost.TabSpec buildTabSpec(String tag, int resLabel, int resIcon,
			final Intent content) {
		return tabHost
				.newTabSpec(tag)
				.setIndicator(getString(resLabel),
						getResources().getDrawable(resIcon))
				.setContent(content);
	}
	/**
	 * ���õ�ǰTab��ѡ�к��Activity
	 * 
	 * @param buttonView
	 * @param isChecked
	 */
	public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
		if (!isChecked) {
			return;
		}
		switch (buttonView.getId()) {
			case R.id.TabBlog :
				whichTab = "blog";
				tabHost.setCurrentTabByTag("blog");
				break;
			case R.id.TabNews :
				whichTab = "news";
				tabHost.setCurrentTabByTag("news");
				break;
			case R.id.TabRss :
				whichTab = "rss";
				tabHost.setCurrentTabByTag("rss");
				break;
			case R.id.TabSearch :
				whichTab = "search";
				tabHost.setCurrentTabByTag("search");
				break;
			case R.id.TabMore :
				whichTab = "more";
				tabHost.setCurrentTabByTag("more");
				break;
		}
	}
	// �洢�ر�ʱ��tab
	protected void onDestroy() {
		SharedPreferences settings = getSharedPreferences(
				res.getString(R.string.preferences_key), MODE_PRIVATE);
		SharedPreferences.Editor editor = settings.edit();
		editor.putString(res.getString(R.string.preferences_current_tab),
				whichTab);
		editor.commit();
		super.onDestroy();
	}
}