gec210_config :	unconfig
	@$(MKCONFIG) $(@:_config=) arm s5pc11x gec210 samsung s5pc110
	@echo "TEXT_BASE = 0xc3e00000" > $(obj)board/samsung/smdkc110/config.mk

145行
CROSS_COMPILE = /usr/local/arm/arm-2009q3/bin/arm-none-linux-gnueabi-

make
cp u-boot   /tftpboot

      最近项目要定时从服务器获取某些信息，通过研究来总结一下下【我以定时判断网络状态为例来阐述】

     原理：

    我们定义一个Service，在该Service中设置一个定时器Timer,通过TimerTask的策略来检查当前应用的网络连接状态，关键是在该Service需要自定义一个回调接口用于向我们的Activity来回调发送网络状态，然后通过Bind来绑定当前的Service,在绑定成功之后得到回调信息

  代码：

Service类

package com.example.androidtimerdemo;

import java.util.Timer;
import java.util.TimerTask;

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.NetworkInfo.State;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class NetService extends Service
{

	@Override
	public IBinder onBind(Intent intent)
	{
		// TODO Auto-generated method stub
		return netBind;
	}

	//上下文
	Context context;
	
	//网络连接状态
	boolean isConntect = true;
    
	//定时器
	Timer timer = new Timer();

	@Override
	public void onCreate()
	{
		// 注册广播   检查网络状态
		IntentFilter filter = new IntentFilter();
		filter.addAction( ConnectivityManager.CONNECTIVITY_ACTION );
		registerReceiver( receiver, filter );
		Log.i( "tag", "service**"+Thread.currentThread().getId() );
		super.onCreate();
	}

	//网络检查广播接受者
	private BroadcastReceiver receiver = new BroadcastReceiver()
	{

		@Override
		public void onReceive(Context context, Intent intent)
		{
			String action = intent.getAction();
			// 启动定时任务
			if (action.equals( ConnectivityManager.CONNECTIVITY_ACTION ))
			{
				//立即启动，每隔5秒执行一次Task
				Log.i( "tag", "receiver**"+Thread.currentThread().getId() );
				timer.schedule( new NetTask( context ), 0, 5*1000 );
			}
		}
	};

	//具体的TimerTask实现类
	class NetTask extends TimerTask
	{

		public NetTask(Context context1)
		{
			context = context1;
		}


		@Override
		public void run()
		{
			
			try
			{
				Thread.sleep( 20*1000 );
			}
			catch (InterruptedException e)
			{
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
			if (isConnectNet())
			{
				isConntect = true;
			}
			else
			{
				isConntect = false;
			}
			Log.i( "tag", "run**"+Thread.currentThread().getId() );
			if (onGetConnectState != null)
			{
				onGetConnectState.GetState( isConntect ); // 通知网络状态改变
			}
		}

	}

	// 网络状态改变之后，通过此接口的实例通知当前网络的状态，此接口在Activity中注入实例对象
	public interface GetConnectState
	{
		public void GetState(boolean isConnected); 
	}

	private GetConnectState onGetConnectState;


	public void setOnGetConnectState(GetConnectState onGetConnectState)
	{
		this.onGetConnectState = onGetConnectState;
	}


	/**
	 * 判断是否连通网络
	 * @return
	 */
	private boolean isConnectNet()
	{
		ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService( Context.CONNECTIVITY_SERVICE );
		NetworkInfo Mobile = connectivityManager.getNetworkInfo( ConnectivityManager.TYPE_MOBILE );

		NetworkInfo Wifi = connectivityManager.getNetworkInfo( ConnectivityManager.TYPE_WIFI );
		if (Mobile.getState().equals( State.DISCONNECTED ) && Wifi.getState().equals( State.DISCONNECTED ))
		{
			return false;
		}
		return true;
	}

	
	 //定义一个Bind类
	private NetBind netBind = new NetBind();
	class NetBind extends Binder
	{
		public NetService getNetService()
		{
			return NetService.this;
		}
	}


	//销毁广播、停止定时轮询
	@Override
	public void onDestroy()
	{
		// TODO Auto-generated method stub
		super.onDestroy();
		timer.cancel();
		unregisterReceiver( receiver );
	}

}

Activity:

package com.example.androidtimerdemo;

import java.util.Timer;
import java.util.TimerTask;

import com.example.androidtimerdemo.MybindService.MyBind;
import com.example.androidtimerdemo.NetService.GetConnectState;
import com.example.androidtimerdemo.NetService.NetBind;

import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener
{

	TextView textView;

	TextView textView2;

	Button button1, button2;

	Activity activity;


	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate( savedInstanceState );
		setContentView( R.layout.activity_main );
		activity = this;
		initView();
	}


	private void initView()
	{
		textView = (TextView) findViewById( R.id.textView1 );
		textView2 = (TextView) findViewById( R.id.textView2 );
		button1 = (Button) findViewById( R.id.button1 );
		button2 = (Button) findViewById( R.id.button2 );
		button1.setOnClickListener( this );
		button2.setOnClickListener( this );

	}

	boolean is;


	@Override
	public void onClick(View v)
	{
		switch (v.getId())
		{
			case R.id.button1:
				// 绑定服务
				Log.i( "tag", "click**" + Thread.currentThread().getId() );
				Intent intent = new Intent( activity, NetService.class );
				boolean isTrue = bindService( intent, conn, Context.BIND_AUTO_CREATE );
				is = isTrue;
				break;
			case R.id.button2:
				unBind();
			default:
				break;
		}
	}


	private void unBind()
	{
		if (conn != null)
		{
			unbindService( conn );
		}
	}

	private boolean conncetState = true;

	private ServiceConnection conn = new ServiceConnection()
	{

		@Override
		public void onServiceDisconnected(ComponentName name)
		{
			// TODO Auto-generated method stub

		}


		@Override
		public void onServiceConnected(ComponentName name, IBinder service)
		{

			NetBind bind = (NetBind) service;
			NetService netService = bind.getNetService();
            //此处回调
			netService.setOnGetConnectState( new GetConnectState()
			{

				@Override
				public void GetState(boolean isConnected)
				{
					// TODO Auto-generated method stub
					if (conncetState != isConnected)
					{
						conncetState = isConnected;
					}
					Message msg = handler.obtainMessage();
					if (conncetState)
					{
						msg.what = 1;
					}
					else
					{
						msg.what = 2;
					}
					handler.sendMessage( msg );
				}
			} );

		}
	};

	Handler handler = new Handler()
	{
		public void handleMessage(Message msg)
		{
			switch (msg.what)
			{
				case 1:
					Toast.makeText( activity, "connect", 2000 ).show();
					break;
				case 2:
					Toast.makeText( activity, "not", 2000 ).show();
				default:
					break;
			}
		};
	};

}