Android Api Demos登顶之路（五十）Notification-->Service Controller

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="@string/hello_world" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/start"
android:text="Start Service"
android:layout_gravity="center_horizontal"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/stop"
android:text="Stop Service"
android:layout_gravity="center_horizontal"/>

</LinearLayout>

public class NotificationService extends Service {

private static final int MOOD_NOTIFICATION = R.id.start;
// ConditionVariable用于线程同步
private ConditionVariable mCondition;
private NotificationManager nm;

@Override
public void onCreate() {
super.onCreate();
// 初始化一些变量
nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
mCondition = new ConditionVariable(false);
Thread notifyThread = new Thread(mTask, "NotificationService");
notifyThread.start();
}

private Runnable mTask = new Runnable() {
@Override
public void run() {
for (int i = 0; i < 4; i++) {
showNotification(R.drawable.star_big_on, "OK");
//如果阻塞在5秒内被打开了，则跳出循环
if(mCondition.block(5*1000)){
break;
}
showNotification(R.drawable.icon48x48_2, "Happy");
//如果阻塞在5秒内被打开了，则跳出循环
if(mCondition.block(5*1000)){
break;
}
showNotification(R.drawable.ic_launcher, "Sad");
//如果阻塞在5秒内被打开了，则跳出循环
if(mCondition.block(5*1000)){
break;
}
}
//循环结束后则结束服务
NotificationService.this.stopSelf();
}
};

//这个对象接收客户端的交互动作
private final IBinder mBinder = new Binder() {

@Override
protected boolean onTransact(int code, Parcel data, Parcel reply,
int flags) throws RemoteException {
return super.onTransact(code, data, reply, flags);
}
};

@Override
public IBinder onBind(Intent intent) {
return mBinder;
}

protected void showNotification(int moodId, String text) {
// 点击消息时启动自己的主Activity,最后一个参数设为0表示使用系统默认的标识符
PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
new Intent(this, MainActivity.class), 0);
Notification.Builder builder=new Builder(this);
/*
* 这里需要注意的是，在这里没对trickerText进行设值，而是通过在通知栏中图标的更新
* 变化来显示通知消息已经发生了改变。官方也强烈要求以这种方式进行设置（如同网络状态的改变的通知）
*/
builder.setSmallIcon(moodId)
.setWhen(System.currentTimeMillis())
.setContentTitle("Mood")
.setContentText(text)
.setDefaults(Notification.DEFAULT_ALL)
.setContentIntent(contentIntent);
Notification noti=builder.build();
nm.notify(MOOD_NOTIFICATION, noti);
}

@Override
public void onDestroy() {
super.onDestroy();
//取消通知消息
nm.cancel(MOOD_NOTIFICATION);
//打开阻塞
mCondition.open();
}

}

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button start=(Button) findViewById(R.id.start);
Button stop=(Button) findViewById(R.id.stop);
start.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startService(new Intent(MainActivity.this, NotificationService.class));
}
});
stop.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
stopService(new Intent(MainActivity.this, NotificationService.class));
}
});
}

}

<service
android:name="com.fishtosky.notificationservice.NotificationService"></service>