标签：android service 四大组件 编程语言 移动开发
距离上篇文章竟然快一年了。这次是想明确service一些比较重要的点。
至于什么是service，我也不想多去讨论，我只想清晰确认这么几个问题：
1、service的生命周期到底如何？
2、Activity如何让service做事？
3、service与thread之间有没有关系？
4、远程service是什么东西？
5、AIDL的使用？
6、前台service?
如果需要图，可以百度，好多。我这里直接运行代码打log。
操作顺序是：
startService(intent)，service相应执行的是oncreate() ------> onStartCommand() ------> onStart()。
stopService(intent)，service相应执行的是onDestroy()。
startService(intent)，service相应执行的是oncreate() ------> onStartCommand() ------> onStart()。
startService(intent)，service相应执行的是onStartCommand() ------> onStart()。
stopService(intent)，service相应执行的是onDestroy()。
这里可见，onCreate() 只会执行一次，即service第一次被启动的时候，在没有destroy之前，继续启动onCreate()不会再执行。
private ServiceConnection connection = new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
// TODO Auto-generated method stub
DebugLog("onServiceConnected()");
}
};public boolean bindService(Intent service, ServiceConnection conn, int flags)
public void unbindService(ServiceConnection conn)
public class MyBinder extends Binder{
public void startDownload(){
DebugLog("start download...");
}
//获取当前Myservice实例
public MyService getService(){
return MyService.this;
}
}这个类里面有一个startDownload()方法，模拟下载。public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
DebugLog("onBind()");
return new MyBinder();
}MyService.MyBinder myBinder = (MyBinder)service; myBinder.startDownload();
private BroadcastReceiver myReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
String string = intent.getStringExtra("main");
DebugLog("string:"+string);
}
};IntentFilter filter = new IntentFilter();
filter.addAction("com.fleur.mybroadcast");
registerReceiver(myReceiver, filter);
DebugLog("registerReceiver success");在service中的onDestroy()函数中反注册：unregisterReceiver(myReceiver);
case R.id.button8:
Intent intent5 = new Intent("com.fleur.mybroadcast");
intent5.putExtra("main", "this broadcast is from mainActivity");
sendBroadcast(intent5);
break;
public interface OnProgressListener {
public void onProgress(int progress);
}
//更新进度的回调接口
private OnProgressListener onProgressListener;
/**
* 注册回调接口的方法
* @param onProgressListener
*/
public void setOnProgressListener(OnProgressListener onProgressListener) {
this.onProgressListener = onProgressListener;
} 然后再Service里面声明一个方法，依然模拟下载：public void startDownload(){
new Thread(){
@Override
public void run() {
while(progress < MAX_PROGRESS){
progress += 5;
//进度发生变化时告诉调用方
if(onProgressListener!=null){
onProgressListener.onProgress(progress);
}
try {
sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}.start();
}public void onServiceConnected(ComponentName name, IBinder service) {
// TODO Auto-generated method stub
DebugLog("onServiceConnected()");
myBinder = (MyBinder) service;
myService = myBinder.getService();
myService.setOnProgressListener(new OnProgressListener() {
@Override
public void onProgress(int progress) {
// TODO Auto-generated method stub
progressBar.setProgress(progress);
}
});
}//然后自己写一个button控制，使用得到的MyService对象调用startDownload()方法，实现回调。
myService.startDownload();
<service android:name="com.fleur.service.MyRemoteService"
android:process=":remote">
<intent-filter >
<action android:name="com.fleur.service.MyRemoteService"/>
</intent-filter>添加了一句话：android:process=":remote"
package com.fleur.service;
interface MyAIDLService{
String toUpperCase(String str);
}
import com.fleur.service.MyAIDLService.Stub;
Stub mBinder = new Stub() {
@Override
public String toUpperCase(String str) throws RemoteException {
// TODO Auto-generated method stub
if(str!=null){
return str.toUpperCase();
}
return null;
}
};其实stub是aidl文件里的，它继承了Binder实现了我们自己写的接口。 private MyAIDLService myAIDLService;
private ServiceConnection conn = new ServiceConnection(
) {
@Override
public void onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
// TODO Auto-generated method stub
myAIDLService = MyAIDLService.Stub.asInterface(service);
try {
String upperStr = myAIDLService.toUpperCase("hello world");
DebugLog("upperStr = "+upperStr);
} catch (RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};这样在去bindService就OK了。实现了不同进程间的通信。Notification notification = new Notification(R.drawable.ic_launcher, "Android_Component", System.currentTimeMillis()); Intent notificationIntent = new Intent(this,MainActivity.class); PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0); notification.setLatestEventInfo(this, "title of notification", "content of notification", pendingIntent); startForeground(1, notification);
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标签：android service 四大组件 编程语言 移动开发
原文地址：http://blog.csdn.net/u014470702/article/details/47617571
