<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"

    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    android:paddingBottom="@dimen/activity_vertical_margin"

    tools:context="com.basillee.asus.demo.MainActivity5">

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="当前时间"

        android:id="@+id/button_current_time"

        android:layout_centerVertical="true"

        android:layout_centerHorizontal="true" />

</RelativeLayout>

package com.basillee.asus.demo;

import android.app.IntentService;

import android.content.Intent;

import android.text.format.Time;

import android.util.Log;

public class CurrentTimeService extends IntentService {

    public CurrentTimeService(){

        super("CurrentTimeService");

    }

    @Override

    protected void onHandleIntent(Intent intent) {

        Time time=new Time();

        time.setToNow();

        String currentTime=time.format("%Y-%m-%d %H:%M:%S");

        Log.i("CurrentTimeService",currentTime);

    }

}

package com.basillee.asus.demo;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

public class MainActivity5 extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main_activity5);

        Button button= (Button) findViewById(R.id.button_current_time);

        button.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                startService(new Intent(MainActivity5.this, CurrentTimeService.class));

            }

        });

    }

}