[Android] Service服务详解以及如何使service服务不被杀死

Services

started

activity

bound

started

Activity

Intent

基础

Service

IBinder

null

AsyncTask

HandlerThread

在 manifest 文件声明服务

manifest

<application>

<service>

<manifest ...>
...
<application ...>
<service android:name=".ExampleService"
android:enabled=["true" | "false"]
android:exported=["true" | "false"]
android:isolatedProcess=["true" | "false"]
android:label="string resource"
android:icon="drawable resource"
android:permission="string"
android:process="string" >
...
</service>
</application>
</manifest>

service

com.example.test.ServiceA

.

.ServiceA

manifest

android:exported="false"

name

true

<application>

enable

true

permission

intent filters

false

true

<application>

lable

lable

label

drawable

startService()

bindService()

stopService()

Intent

<application>

<application>

process

：

创建“启动的”服务

Intent

//activity中
Intent intent = new Intent(MainActivity.this, ServiceA.class);
intent.putExtra("name", strName);
startService(intent);

//service中
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// TODO Auto-generated method stub
// 获取数据
String strName = intent.getStringExtra("name");
// ... 数据库操作
new Thread(new Runnable() {

@Override
public void run() {
// TODO Auto-generated method stub
耗时的操作
}
}).run();
return Service.START_STICKY;
}

service

IntentService

继承IntentService

IntentService

worker

intent

intent

null

intent

IntentService

public class HelloIntentService extends IntentService {

/**
* A constructor is required, and must call the super IntentService(String)
* constructor with a name for the worker thread.
*/
public HelloIntentService() {
super("HelloIntentService");
}

/**
* The IntentService calls this method from the default worker thread with
* the intent that started the service. When this method returns, IntentService
* stops the service, as appropriate.
*/
@Override
protected void onHandleIntent(Intent intent) {
// Normally we would do some work here, like download a file.
// For our sample, we just sleep for 5 seconds.
long endTime = System.currentTimeMillis() + 5*1000;
while (System.currentTimeMillis() < endTime) {
synchronized (this) {
try {
wait(endTime - System.currentTimeMillis());
} catch (Exception e) {
}
}
}
}
}

IntentService

worker

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Toast.makeText(this, "service starting", Toast.LENGTH_SHORT).show();
return super.onStartCommand(intent,flags,startId);
}

继承Service

Service

service

intent

intent

intent

intent

intent

intent

创建“绑定的”服务

activity

IBinder

IBinder

IBinder

//activity中
private ServiceConnection connB = new ServiceConnection() {

@Override
public void onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub
Log.v(tag, "Service B disconnected");
}

@Override
public void onServiceConnected(ComponentName name, IBinder service) {
// TODO Auto-generated method stub
Log.v(tag, "Service B connected");
MyBinderB binder = (MyBinderB) service;
ServiceB SB = binder.getService();
SB.showLog();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

findViewById(R.id.button1).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent a = new Intent(MainActivity.this, ServiceB.class);
bindService(a, connB, BIND_AUTO_CREATE);
}
}

//ServiceB
public class ServiceB extends Service {
public void showLog() {
Log.i(tag, "serviceB-->showLog()");
}

public class MyBinderB extends Binder {

public ServiceB getService() {
return ServiceB.this;
}
}

private MyBinderB myBinderB = new MyBinderB();

@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return myBinderB;
}
}

启动前台服务

notification

notification

notification

notification

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// TODO Auto-generated method stub
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
Notification noti = new Notification.Builder(this)
.setContentTitle("Title")
.setContentText("Message")
.setSmallIcon(R.drawable.ic_launcher)
.setContentIntent(pendingIntent)
.build();
startForeground(12346, noti);
return Service.START_STICKY;
}

服务的生命周期

关于怎样让服务不被杀死

settings

Apps

Running

Stop

settings

Apps

Downloaded

Force Stop

START_STICKY

@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();

mBR = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
Intent a = new Intent(ServiceA.this, ServiceA.class);
startService(a);
}
};
mIF = new IntentFilter();
mIF.addAction("listener");
registerReceiver(mBR, mIF);
}

@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();

Intent intent = new Intent();
intent.setAction("listener");
sendBroadcast(intent);

unregisterReceiver(mBR);
}

force stop

uninstall

public static boolean isServiceRunning(String serviceClassName){
final ActivityManager activityManager = (ActivityManager)Application.getContext().getSystemService(Context.ACTIVITY_SERVICE);
final List<RunningServiceInfo> services = activityManager.getRunningServices(Integer.MAX_VALUE); //这个value取任意大于1的值，但返回的列表大小可能比这个值小。

for (RunningServiceInfo runningServiceInfo : services) {
if (runningServiceInfo.service.getClassName().equals(serviceClassName)){
return true;
}
}
return false;
}