Android学习笔记之IntentService
Android学习笔记之IntentService
IntentService是继承并处理异步请求的一个类,IntentService内有一个工作线程来处理耗时操作,启动IntentService的方式和启动传统的Service一样,同时,当任务执行完后,IntentService会自动停止,而不需要我们手动去控制或stopSelf()。另外,可以启动IntentService多次,而每一个耗时操作会以工作队列的方式在IntentService的onHandleIntent回调方法中执行,并且,每次只会执行一个工作线程,执行完第一个再执行第二个,以此类推。
这里我使用IntentService来输出一个Notification。
package es.source.code.service;
import android.app.IntentService;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Binder;
import android.os.Build;
import android.os.Bundle;
import android.os.IBinder;
import android.support.v4.app.NotificationCompat;
import es.source.code.activity.FoodDetailed;
import es.source.code.activity.R;
import es.source.code.model.Food;
public class UpdateService extends IntentService {
public UpdateService() {
super("UpdateService");
}
public UpdateService(String name) {
super(name);
}
@Override
protected void onHandleIntent(Intent intent) {
//update foodview;
System.out.println("onHandleIntent");
Bundle bundle = (Bundle)intent.getBundleExtra("new food");
String name = (String)bundle.get("name");
int storage = (int)bundle.get("storage");
System.out.println(name+storage);
Food food = new Food("new food", 13, 10, R.drawable.order_item_logo,
false);
sendNotification(food);
}
private void sendNotification(Food food){
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = null;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel mChannel = new NotificationChannel("channel_01", "name",
NotificationManager.IMPORTANCE_HIGH);
Intent resultIntent = new Intent(this,FoodDetailed.class);
//intent可以携带参数到指定页面的,这里省略
//resultIntent.putExtra(key,value);
//添加数据
resultIntent.putExtra("newfood", food);
PendingIntent pendingIntent = PendingIntent.getActivity(this,0,
resultIntent,PendingIntent.FLAG_IMMUTABLE);
notificationManager.createNotificationChannel(mChannel);//注意
notification = new Notification.Builder(this)
.setChannelId("channel_01")
.setContentTitle("新菜")
.setContentText("New food.name:"+food.getFoodName()+
" price:" + food.getPrice() +" kind:"+"coldfood")
.setSmallIcon(R.mipmap.ic_launcher)
.setContentIntent(pendingIntent)
.build();
notificationManager.notify(1, notification);
} else {
Intent resultIntent = new Intent(this,FoodDetailed.class);
//intent可以携带参数到指定页面的,这里省略
//resultIntent.putExtra(key,value);
PendingIntent pendingIntent = PendingIntent.getActivity(this,0,
resultIntent,PendingIntent.FLAG_UPDATE_CURRENT);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setContentTitle("新菜")
.setContentText("New food.name:"+food.getFoodName()+
" price:" + food.getPrice() +" kind:"+"coldfood")
.setSmallIcon(R.mipmap.ic_launcher)
.setOngoing(true)
.setChannelId("channel_01")//无效
.setContentIntent(pendingIntent);
notification = notificationBuilder.build();
notificationManager.notify(1, notification);
}
注意这里的
notification因为版本的原因android8.0以上需要使用channel参数