package com.example.hellowrold;import java.util.Random;import com.example.hellowrold.R.id;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.graphics.Typeface;import android.view.Menu;import android.view.View;import android.widget.Button;public class EX0314 extends Activity {    private Button startButton;    private Button stopbuButton;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_ex0314);                startButton=(Button)findViewById(id.Ex0314StartButton);        startButton.setOnClickListener(new Button.OnClickListener() {                        @Override            public void onClick(View v) {                // TODO Auto-generated method stub                Intent sIntent=new Intent(EX0314.this,mService1.class);                sIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);                startService(sIntent);            }        });                        stopbuButton=(Button)findViewById(id.Ex0314StopButton);        stopbuButton.setOnClickListener(new Button.OnClickListener() {                        @Override            public void onClick(View v) {                // TODO Auto-generated method stub                Intent sIntent=new Intent(EX0314.this,mService1.class);                stopService(sIntent);            }        });            }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.ex0314, menu);        return true;    }}

package com.example.hellowrold;import android.R.integer;import android.app.Service;import android.content.Intent;import android.os.Handler;import android.os.IBinder;import android.util.Log;public class mService1 extends Service{private Handler objHandler=new Handler();private int intCounter=0;private Runnable mTasks=new Runnable() {        @Override    public void run() {        // TODO Auto-generated method stub        intCounter++;        Log.i("hippo","计算器"+Integer.toString(intCounter));        objHandler.postDelayed(mTasks, 1000);    }};@Override    public void onCreate() {        // TODO Auto-generated method stub        super.onCreate();                objHandler.postDelayed(mTasks, 1000);    }@Override    public void onDestroy() {        // TODO Auto-generated method stub        super.onDestroy();                objHandler.removeCallbacks(mTasks);    }@Override    public IBinder onBind(Intent intent) {        // TODO Auto-generated method stub        return null;    }}

        <activity            android:name="com.example.hellowrold.EX0314"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <service android:name=".mService1"            android:exported="false">        </service>