MainActivity.java

package com.gapp.gvoa;


import java.io.File;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.concurrent.TimeUnit;

import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;

import com.gapp.gvoa.datatype.RssItem;
import com.gapp.gvoa.db.DbRssItem;
import com.gapp.gvoa.db.GRSSDbHandler;
import com.gapp.gvoa.ui.GVOASettings;
import com.gapp.gvoa.ui.RssFeedListActivity;
import com.gapp.gvoa.util.GPreference;
import com.gapp.gvoa.util.GvoaUtil;

public class MainActivity extends TabActivity {
	private static final String TAG = "MainActivity";
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);       
        
        this.globalInit();
        
        setTitle(R.string.app_name);
                
        
        setContentView(R.layout.main_tab);
        
        /* TabHost will have Tabs */
        TabHost tabHost = (TabHost)findViewById(android.R.id.tabhost);
        tabHost.setup();
               
        /* tid1 is firstTabSpec Id. Its used to access outside. */
        TabSpec firstTabSpec = tabHost.newTabSpec("RSS");
        TabSpec secondTabSpec = tabHost.newTabSpec("Setting");
        
        firstTabSpec.setIndicator("RSS").setContent(new Intent(this,RssFeedListActivity.class));
        secondTabSpec.setIndicator("Setting").setContent(new Intent(this,GVOASettings.class));
        
        
        /* Add tabSpec to the TabHost to display. */
        tabHost.addTab(firstTabSpec);
        tabHost.addTab(secondTabSpec);
        
        tabHost.setCurrentTab(0);
    }
    
    public void globalInit()
    {
    	//init database
        GRSSDbHandler.initInstance(this.getBaseContext());        
        GPreference.init(this);
        
        this.clearOldCache();   
        
    }
    
    private void clearOldCache()
    {
    	int days = GPreference.getPreferredExpireDays();
    	
    	List<RssItem>  rssItemList = DbRssItem.getAllItems(-1);     	
    	Date dateNow = new Date();
    	long nowTime = dateNow.getTime(); 
    	for (RssItem item: rssItemList){
    		SimpleDateFormat fmt =new SimpleDateFormat("yyyy-MM-dd");
        	try {
				Date date1 = fmt.parse(item.getPubDate().trim());								
				long daysBetween = TimeUnit.MILLISECONDS.toDays(nowTime - date1.getTime());
				
				if(daysBetween >= days)
				{
					if(item.getLocalmp3()!=null && GvoaUtil.isFileExists(item.getLocalmp3()))
					{
		    		    File file = new File(item.getLocalmp3());
	    			    file.delete();
					}				
					DbRssItem.deleteItem(item);
				}				
				
			} catch (ParseException e) {
				e.printStackTrace();
			}           	
    		
    	}
    	
        String sdRoot=Environment.getExternalStorageDirectory().getPath();		
		File gvoaDir = new File(sdRoot + "/" +"gvoa");
    	
        if(!gvoaDir.exists())
        {
             return; 
        }
        
        File[] files = gvoaDir.listFiles(); 
        if (files == null)
            return;
        for (int i = 0; i < files.length; i++) {
            if (!files[i].isDirectory()) {
                           
                String fileName = files[i].getName();
                
                if(!fileName.matches("\\d{8}_.*"))
                {
                	Log.i(TAG, "pattern not matched,  delete "+fileName);
                	files[i].delete(); 
                	continue; 
                }
                
                try {
                    SimpleDateFormat fmt =new SimpleDateFormat("yyyyMMdd");                
					Date date1 = fmt.parse(fileName.substring(0,8));
					long daysBetween = TimeUnit.MILLISECONDS.toDays(nowTime - date1.getTime())+1;
					
					if(daysBetween >= days)
					{
						Log.i(TAG, "normal delete "+fileName);
						files[i].delete();						 
					}
					
				} catch (ParseException e) {
                    Log.i(TAG, "parse date failed",e);
                    Log.i(TAG, "exception delete "+fileName); 
					files[i].delete(); 
				}                  
            }
        } 
		

    	
    	
    	
    	
    	
    		
    	
    }
    
    


}