Android Service启动方式总结
1、StartService（）启动Service的方式：
onCreate-->
onStartCommand
(
可多次调用
)-->onDestroy
在onCreate（）后，每次startService（）将会直接进入onStartCommand，onStart（）已经被废弃
在Activity中调用stopService（）或在service内部调用stopSelf（）结束Service
2、对于
bindService()
启动
Service
会经历：
context.bindService()->onCreate()->onBind()->Service running-->onUnbind() -> onDestroy() ->Service stop
Service是可以和多个Activity进行绑定的，但要注意的是，当Activity结束时一定要跟相应的Service解除绑定，不然是会报异常的（Main4Activity has leaked ServiceConnection），虽然此时即使报异常也不会影响Activity的结束了，然后还是会强制的解除绑定。
当多个Activity与Service进行绑定的时候，只有当所有的绑定都解除了之后，Service才会结束。
3、对于既用StartService（）和bindService()启动的Service：
这种调用方法可以起到即使与Service绑定的Activity结束了，Service依然不会死掉。这种方式启动的Service需要同时调用stopService（）和unbindService（）解除了所有绑定之后才能结束Service。
下面是两个Activity绑定一个Service的演示代码：
第一个Activity：
package com.example.administrator.androidtrainingtest;
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.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.widget.Button;
public class Main3Activity extends AppCompatActivity {
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.activity_main3);
Button btnStart = (Button) findViewById(R.id.btnStart);
Button btnStop = (Button) findViewById(R.id.btuStop);
Button butStartActivity = (Button) findViewById(R.id.btnStartActivity);
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();
}
});
butStartActivity.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(Main3Activity.this, Main4Activity.class));
}
});
}
//启动service 方式2
//
private void bindService(){
Intent intent = new Intent(Main3Activity.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()");
BindService.MyBinder binder = (BindService.MyBinder)service;
BindService bindService = binder.getService1();
bindService.MyMethod();
flag = true;
}
};
}
第二个Activity：
package com.example.administrator.androidtrainingtest;
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.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.widget.Button;
public class Main4Activity extends AppCompatActivity {
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.activity_main4);
Button btnStart = (Button) findViewById(R.id.btnStart);
Button btnStop = (Button) findViewById(R.id.btuStop);
Button butStartActivity = (Button) findViewById(R.id.btnStartActivity);
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(Main4Activity.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()");
BindService.MyBinder binder = (BindService.MyBinder)service;
BindService bindService = binder.getService1();
bindService.MyMethod();
flag = true;
}
};
}
Service：
package com.example.administrator.androidtrainingtest;
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);
}
}
两次绑定及解除绑定的结果：
09-07 19:08:40.458 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: bindService()
09-07 19:08:40.468 9536-9536/com.example.administrator.androidtrainingtest I/BindService: BindService-->onCreate()
09-07 19:08:40.488 9536-9536/com.example.administrator.androidtrainingtest I/BindService: BindService-->onBind()
09-07 19:08:40.498 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: onServiceConnected()
09-07 19:08:40.498 9536-9536/com.example.administrator.androidtrainingtest I/BindService: BindService-->MyMethod()
09-07 19:08:43.961 9536-9536/com.example.administrator.androidtrainingtest I/Timeline: Timeline: Activity_launch_request time:20965521
09-07 19:08:44.071 9536-9536/com.example.administrator.androidtrainingtest D/ActivityThreadInjector: clearCachedDrawables.
09-07 19:08:44.262 9536-9581/com.example.administrator.androidtrainingtest D/OpenGLRenderer: endAllActiveAnimators on 0xb4f90580 (RippleDrawable) with handle 0xa520db60
09-07 19:08:44.272 9536-9536/com.example.administrator.androidtrainingtest I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@3dcf5808 time:20965832
09-07 19:08:45.943 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: bindService()
09-07 19:08:45.963 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: onServiceConnected()
09-07 19:08:45.963 9536-9536/com.example.administrator.androidtrainingtest I/BindService: BindService-->MyMethod()
09-07 19:08:48.426 9536-9547/com.example.administrator.androidtrainingtest I/art: Debugger is no longer active
09-07 19:09:17.444 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: unBindService() start....
09-07 19:09:17.444 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: unBindService() flag
09-07 19:09:21.658 9536-9536/com.example.administrator.androidtrainingtest I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@178fe5a8 time:21003228
09-07 19:09:24.120 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: unBindService() start....
09-07 19:09:24.120 9536-9536/com.example.administrator.androidtrainingtest I/TestActivity: unBindService() flag
09-07 19:09:24.131 9536-9536/com.example.administrator.androidtrainingtest I/BindService: BindService-->onUnbind()
09-07 19:09:24.131 9536-9536/com.example.administrator.androidtrainingtest I/BindService: BindService-->onDestroy()
09-07 19:09:27.043 9536-9547/com.example.administrator.androidtrainingtest I/art: Debugger is no longer active