1.Context.startService()方式启动
①Context.startService()方式的生命周期： 启动时，startService –> onCreate() –> onStart()停止时，stopService –> onDestroy()如果调用者直接退出而没有停止Service，则Service 会一直在后台运行 Context.startService()方法启动服务，在服务未被创建时，系统会先调用服务的onCreate()方法，接着调用onStart()方法。如果调用startService()方法前服务已经被创建，多次调用startService()方法并不会导致多次创建服务，但会导致多次调用onStart()方法。采用startService()方法启动的服务，只能调用Context.stopService()方法结束服务，服务结束时会调用onDestroy()方法附代码
2.Context.bindService()方式启动：①Context.bindService()方式的生命周期： 绑定时,bindService -> onCreate() –> onBind()调用者退出了，即解绑定时,Srevice就会unbindService –>onUnbind() –> onDestory()Context.bindService()方式启动 Service的方法：绑定Service需要三个参数：bindService(intent, conn, Service.BIND_AUTO_CREATE);第一个：Intent对象第二个：ServiceConnection对象，创建该对象要实现它的onServiceConnected()和 onServiceDisconnected()来判断连接成功或者是断开连接第三个：如何创建Service，一般指定绑定的时候自动创建附代码
package com.dada.test;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
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.widget.Button;
import com.dada.test.BindService.MyBinder;
public class TestActivity extends Activity {
private boolean flag;
private static final String TAG = "TestActivity";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btnStart = (Button) findViewById(R.id.btnStart);
Button btnStop = (Button) findViewById(R.id.btnStop);
btnStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//启动service 方式2
bindService();
}
});
btnStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//停止service 方式2
unBindService();
}
});
}
//启动service 方式2
//
private void bindService(){
Intent intent = new Intent(TestActivity.this,BindService.class);
Log.i(TAG, "bindService()");
bindService(intent, conn, Context.BIND_AUTO_CREATE);
}
private void unBindService(){
Log.i(TAG, "unBindService() start....");
if(flag == true){
Log.i(TAG, "unBindService() flag");
unbindService(conn);
flag = false;
}
}
private ServiceConnection conn = new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub
Log.i(TAG, "onServiceDisconnected()");
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
// TODO Auto-generated method stub
Log.i(TAG, "onServiceConnected()");
MyBinder binder = (MyBinder)service;
BindService bindService = binder.getService1();
bindService.MyMethod();
flag = true;
}
};
}
service
package com.dada.test;
import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
public class BindService extends Service {
private static final String TAG = "BindService";
private MyBinder myBinder = new MyBinder();
public void MyMethod(){
Log.i(TAG, "BindService-->MyMethod()");
}
@Override
public IBinder onBind(Intent intent) {
Log.i(TAG, "BindService-->onBind()");
return myBinder;
}
public class MyBinder extends Binder{
public BindService getService1(){
return BindService.this;
}
}
@Override
public void onCreate() {
Log.i(TAG, "BindService-->onCreate()");
super.onCreate();
}
@Override
public void onStart(Intent intent, int startId) {
Log.i(TAG, "BindService-->onStart()");
super.onStart(intent, startId);
}
@Override
public void onDestroy() {
Log.i(TAG, "BindService-->onDestroy()");
super.onDestroy();
}
@Override
public boolean onUnbind(Intent intent) {
Log.i(TAG, "BindService-->onUnbind()");
return super.onUnbind(intent);
}
}
运行日志
点击启动
点击停止
没有打出onServiceDisconnected的日志的原因：
注：SDK上是这么说的：This is called when the connection with the service has beenunexpectedly disconnected -- that is, its process crashed. Because it is running in our same
process, we should never see this happen.
所以说，只有在service因异常而断开连接的时候，这个方法才会用到
其他
由于Service 的onStart()方法只有在startService()启动Service的情况下才调用，故使用onStart()的时候要注意这点。
与 Service 通信并且让它持续运行
如果我们想保持和 Service 的通信，又不想让 Service 随着 Activity 退出而退出呢？你可以先 startService() 然后再 bindService() 。当你不需要绑定的时候就执行 unbindService() 方法，执行这个方法只会触发 Service 的 onUnbind() 而不会把这个 Service 销毁。这样就可以既保持和 Service 的通信，也不会随着 Activity 销毁而销毁了。