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MainActivity如下:

package cc.testservice2;import android.app.Activity;import android.content.ComponentName;import android.content.Intent;import android.content.ServiceConnection;import android.os.Bundle;import android.os.IBinder;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;/** * Demo描述: * 前台Service使用示例 *  *  * 主要实现: * 1 在Service的onCreate()中调用startForeground() * 2 在Service的onDestroy()中调用stopForeground() * 3 一个Notification常驻在状态栏,当后台数据变化时需要 *   更新该通知中的显示内容.在该示例中只用了一个简单的 *   系统自带Notification来演示,实际项目中多半会用到 *   自定义的Notification涉及到RemoteView. *  *  * 前台服务的特点: * 1 可尽量避免系统内容不足的时候被系统回收 * 2 它会有一个图标一直在状态栏显示,拉下状态栏后可见更多信息. *   比如有的天气App就采用了该前台服务来实现. *    *    * 测试环境: * 1 该示例测试环境为Android4.4 * 2 在Android2.3及其以下版本可能报错: *   java.lang.IllegalArgumentException: contentIntent required *    *  * 注意权限: *  
    *   *  * 参考资料: * 1 http://blog.csdn.net/guolin_blog/article/details/11952435 * 2 http://blog.csdn.net/lfdfhl/article/details/38226523 * 3 http://blog.csdn.net/vipzjyno1/article/details/25248021 * 4 http://blog.csdn.net/think_soft/article/details/7299438 * 5 http://blog.csdn.net/lfdfhl/article/details/10044161 *   Thank you very much */public class MainActivity extends Activity {    TextView mNumberTextView;    TextView mResultTextView;    Button mSearchButton;      ServiceConnectionImpl mServiceConnectionImpl;    QueryInterface  mBinder;     public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        //用于接收服务返回的Binder对象        mServiceConnectionImpl=new ServiceConnectionImpl();        mNumberTextView=(TextView) findViewById(R.id.numberEditText);        mResultTextView=(TextView) findViewById(R.id.resultTextView);        mSearchButton=(Button) findViewById(R.id.searchButton);        mSearchButton.setOnClickListener(new ButtonOnClickListener());        Intent intent=new Intent(this,ServiceSubclass.class);        //当Activity启动的时候就启动服务        bindService(intent, mServiceConnectionImpl, this.BIND_AUTO_CREATE);    }        private class ButtonOnClickListener implements OnClickListener{		public void onClick(View v) {						String number=mNumberTextView.getText().toString();			String result=mBinder.queryByNumber(Integer.valueOf(number));			mResultTextView.setText(result);		}   	    }        //绑定服务和解除服务    private final class ServiceConnectionImpl implements ServiceConnection{    	//绑定服务时,此方法调用		public void onServiceConnected(ComponentName name, IBinder service) {			 mBinder=(QueryInterface) service;					}		//解除服务时,此方法调用		public void onServiceDisconnected(ComponentName name) {			mBinder=null;		}   	    }       //解除与服务的连接	protected void onDestroy() {		unbindService(mServiceConnectionImpl);		super.onDestroy();		}       }

ServiceSubclass如下:

package cc.testservice2;import android.app.Notification;import android.app.Notification.Builder;import android.app.NotificationManager;import android.app.PendingIntent;import android.app.Service;import android.content.Context;import android.content.Intent;import android.os.Binder;import android.os.IBinder;public class ServiceSubclass extends Service {	private String[] names = new String[] { "小明", "小王", "小杨", "小李", "小强" };	BinderSubclass mBinderSubclass = new BinderSubclass();	private String result=null;	private Context mContext;	private Builder mBuilder;	private PendingIntent mPendingIntent;    private Notification mNotification;    private NotificationManager mNotificationManager;    private final int NOTIFICATION_ID=9527;	@Override	public void onCreate() {		super.onCreate();		mContext=this;		System.out.println("在onCreate()中---> startForeground()");		//准备Notification		initNotification(mContext);		//开启前台服务		startForeground(NOTIFICATION_ID, mNotification);	}			@Override	public IBinder onBind(Intent intent) {		return mBinderSubclass;	}		@Override	public void onDestroy() {		super.onDestroy();		//终止前台服务		stopForeground(true);		System.out.println("在onDestroy()中---> stopForeground()");	}				// queryByNumber就是接口里的业务方法.	//一般来讲将业务抽象为一个接口,然后去实现接口,比如此处。	// 注意:BinderSubclass继承自Binder也实现了业务接口	private final class BinderSubclass extends Binder implements QueryInterface {		public String queryByNumber(int number) {			return query(number);		}	}	//服务内部的方法	public String query(int i) {		if (i > 0 && i < 6) {			result=names[i - 1];			//更新通知			updateNotification(result);			return result;		}		return "查询错误，请再次输入";	}	/**	 * 发送通知	 */	private void initNotification(Context context){		Intent intent=new Intent(mContext, MainActivity.class);		mPendingIntent=PendingIntent.getActivity(mContext, 0,intent, PendingIntent.FLAG_UPDATE_CURRENT);		mNotificationManager=(NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);		mBuilder=new Builder(mContext);		//通知产生的时间		mBuilder.setWhen(System.currentTimeMillis());		//通知首次出现在通知栏时的提示文字		mBuilder.setTicker("Ticker");		mBuilder.setContentTitle("ContentTitle");		mBuilder.setContentInfo("ContentInfo");		mBuilder.setContentText("ContentText");		mBuilder.setContentIntent(mPendingIntent);		//通知的优先级		mBuilder.setPriority(Notification.PRIORITY_DEFAULT);		//设置通知的图标.必须要有这句否则通知不显示!!!		mBuilder.setSmallIcon(R.drawable.ic_launcher);		//为通知添加声音,闪灯和振动效果等效果		mBuilder.setDefaults(Notification.DEFAULT_VIBRATE);		//设置通知是否为一个正在进行的通知.后台任务时常使用true		mBuilder.setOngoing(false);				mNotification=mBuilder.build();		//通知被点击后自动消失		mNotification.flags = Notification.FLAG_AUTO_CANCEL;		mNotificationManager.notify(NOTIFICATION_ID, mNotification);	}			/**	 * 更新通知	 */	private void updateNotification(String result){		mBuilder.setContentTitle("Title");		mBuilder.setContentInfo("Info");		mBuilder.setContentText(result);		mNotification=mBuilder.build();		mNotification.flags = Notification.FLAG_AUTO_CANCEL;		mNotificationManager.notify(NOTIFICATION_ID, mNotification);	}}

package cc.testservice2;//业务接口public interface QueryInterface {   public String queryByNumber(int number);}

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