Android开发入门之Service用法分析

<&＃63;xml version="1.0" encoding="utf-8"&＃63;>

public class MyService extends Service
{
 final static String TAG = "MyService";
 @Override
 public IBinder onBind(Intent intent)
 {
  Log.i(TAG,"OnBind()......");
  showInfo("Onbind()......");
  return null;
 }
 // Setvice创建时被调用
 @Override
 public void onCreate()
 {
  Log.i(TAG,"onCreate()......");
   showInfo("onCreate()......");
  super.onCreate();
 }
 //当客户调用startService()启动Service时被调用
 @Override
 public void onStart(Intent intent, int startId)
 {
  Log.i(TAG,"onStart()........");
  showInfo("onStart()........");
  super.onStart(intent, startId);
 }
 @Override
 public void onDestroy()
 {
  Log.i(TAG,"onDestroy()........");
  showInfo("onDestroy()........");
  super.onDestroy();
 }
 @Override
 public boolean onUnbind(Intent intent)
 {
  Log.i(TAG,"onUnbind()........");
  showInfo("onUnbind()........");
  return super.onUnbind(intent);
 }
 public void showInfo(String str)
 {
  Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
 }
}

package com.study.android;
import android.app.Activity;
import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
 final static String ACTION = "com.study.android.action.MY_SERVICE";
 private Button startButton,stopButton;
 private Button bindButton,unbindButton;
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  startButton = (Button)findViewById(R.id.startButton);
  stopButton = (Button)findViewById(R.id.stopButton);
  bindButton = (Button)findViewById(R.id.bindButton);
  unbindButton = (Button)findViewById(R.id.unBindButton);
  // 开启服务
  startButton.setOnClickListener(new OnClickListener()
 {
  @Override
  public void onClick(View v)
  {
   // 启动服务
   startService(buildIntent());
  }
 });
  //startButton按下后 周期函数执行顺序 onCreate()----->onStart()
  /******************************************/
  // 停止服务
  stopButton.setOnClickListener(new OnClickListener()
 {
  @Override
  public void onClick(View v)
  {
   stopService(buildIntent());
  }
 });
  //stopButton按下后 周期函数执行顺序 onDestroy()
   /******************************************/
  // 绑定服务
  bindButton.setOnClickListener(new OnClickListener()
 {
  @Override
  public void onClick(View v)
  {
   bindService(buildIntent(),conn,Service.BIND_AUTO_CREATE);
   /*第三个参数：如何创建service 一般是制定绑定时自动创建*/
  }
 });
  // bindButton 被按下后（当前服务已经stop掉）周期函数执行顺序 onCreate()------->onBind()
   /******************************************/
  // 接触绑定Service
  unbindButton.setOnClickListener(new OnClickListener()
 {
  @Override
  public void onClick(View v)
  {
   unbindService(conn);
  }
 });
  //unbindButton按下后 周期函数执行顺序onUnbind()------->onDestroy()
 }
 // 连接对象
 private ServiceConnection cOnn= new ServiceConnection()
 {
 @Override
 public void onServiceConnected(ComponentName name, IBinder service)
 {
   Log.i("SERVICE","连接服务成功！");
   showInfo("连接服务成功！");
 }
 @Override
 public void onServiceDisconnected(ComponentName name)
 {
  Log.i("SERVICE","服务连接断开！");
  showInfo("服务连接断开！");
 }
 };
 public Intent buildIntent()
 {
  Intent intent = new Intent();
  // 设置Intent属性 注意：这里action属性要与Manifest里服务对应
  intent.setAction(ACTION);
  return intent;
 }
 public void showInfo(String str)
 {
   Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
 }
}