activity_main

MainActivity

package com.example.android_service;import android.app.Activity;import android.app.ActionBar;import android.app.Fragment;import android.content.Intent;import android.os.Bundle;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.widget.Button;import android.os.Build;public class MainActivity extends Activity {	private Button stop,start;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                start=(Button)this.findViewById(R.id.start);        stop=(Button)this.findViewById(R.id.stop);        final Intent intent=new Intent();        intent.setAction("dashu.test.service");        start.setOnClickListener(new View.OnClickListener() {						@Override			public void onClick(View arg0) {				// TODO Auto-generated method stub				startService(intent);			}		});        stop.setOnClickListener(new View.OnClickListener() {						@Override			public void onClick(View v) {				// TODO Auto-generated method stub				stopService(intent);			}		});    }}

MyService

package com.example.android_service;import android.app.Service;import android.content.Intent;import android.os.IBinder;import android.util.Log;public class MyService extends Service {	private final static String TAG = "dashu";	@Override	public IBinder onBind(Intent arg0) {		// TODO Auto-generated method stub		return null;	}	// Service创建时候回调	@Override	public void onCreate() {		// TODO Auto-generated method stub		super.onCreate();		Log.d(TAG, "-->服务创建");	}	//服务启动时候回调	@Override	public int onStartCommand(Intent intent, int flags, int startId) {		// TODO Auto-generated method stub		Log.d(TAG, "-->服务启动");		return super.onStartCommand(intent, flags, startId);		}	//服务关闭时候回调	@Override	public void onDestroy() {		// TODO Auto-generated method stub		super.onDestroy();		Log.d(TAG, "-->服务关闭");	}}

 

使用context.startService() 启动Service是会会经历:

context.startService()  ->onCreate()- >onStart()->Service running

context.stopService() | ->onDestroy() ->Service stop 

 

假设Service还没有执行，则android先调用onCreate()然后调用onStart()；假设Service已经执行，则仅仅调用onStart()。所以一个Service的onStart方法可能会反复调用多次。 

 

stopService的时候直接onDestroy，假设是调用者自己直接退出而没有调用stopService的话，Service会一直在后台执行。该Service的调用者再启动起来后能够通过stopService关闭Service。

 

所以调用startService的生命周期为：onCreate --> onStart(可多次调用) --> onDestroy