5.Android消息推送机制简单例子

1.首先布局文件xml代码：

 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context="com.example.riger.notificationdemo.MainActivity">

     <LinearLayout
         android:orientation="vertical"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:layout_alignParentTop="true"
         android:layout_alignParentLeft="true"
         android:layout_alignParentStart="true">

         <TextView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="hello"
             android:id="@+id/textView" />

         <Button
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:text="通知"
             android:id="@+id/btnStart" />

         <Button
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:text="清除"
             android:id="@+id/btnStop" />
     </LinearLayout>
 </RelativeLayout>

2.主界面代码MainActivity:

 public class MainActivity extends Activity implements View.OnClickListener{

     private Button btnStart;
     private Button btnStop;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         initView();
     }

     public void initView(){
         btnStart = (Button)findViewById(R.id.btnStart);
         btnStop = (Button)findViewById(R.id.btnStop);
         btnStart.setOnClickListener(this);
         btnStop.setOnClickListener(this);
     }

     @Override
     public void onClick(View view) {
         int id = view.getId();
         switch(id){
             case R.id.btnStart:
                 //启动服务
                 Intent intent = new Intent();
                 intent.setAction("ymw.MY_SERVICE");
                 intent.setPackage("com.example.riger.notificationdemo");
                 startService(intent);
                 break;
             case R.id.btnStop:
                 Intent i = new Intent();
                 i.setAction("ymw.MY_SERVICE");
                 i.setPackage("com.example.riger.notificationdemo");
                 stopService(i);
                 break;
             default:
                 break;
         }

     }
 }

3.消息推送服务文件NotificationService

 public class NotificationService extends Service{

     private static final String TAG = NotificationService.class.getSimpleName();
     //获取消息线程
     private MessageThread messageThread = null;

     //点击查看
     private Intent messageIntent = null;
     private PendingIntent messagePendingIntent = null;

     //通知栏消息
     private NotificationManager messageNotificationManage = null;

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

     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
         // 初始化
         messageNotificationManage = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

         messageIntent = new Intent(this,MainActivity.class);
         messagePendingIntent = PendingIntent.getActivity(this,0,messageIntent,0);

         // 开启线程
         messageThread = new MessageThread();
         messageThread.isRunning = true;
         messageThread.start();

         return super.onStartCommand(intent,flags,startId);
     }

     /**
      * 从服务器获取信息
      */
     class MessageThread extends Thread{
         public boolean isRunning = false;
         public void run() {
             try{
                 Log.v(TAG,"111111111");
                 // 间隔时间
                 Thread.sleep(1000);
                 // 获取服务器消息
                 String serverMessage = getServerMessage();
                 if (serverMessage != null && !"".equals(serverMessage)) {
                     Log.v(TAG,"22222222");
                     // 更新通知栏
                     Notification.Builder builder = new Notification.Builder(NotificationService.this);
                     builder.setSmallIcon(R.mipmap.ic_launcher);
                     builder.setTicker("显示第一个通知");
                     builder.setContentTitle("第一个通知");
                     builder.setContentText("Hello World!");
                     builder.setWhen(System.currentTimeMillis()); //发送时间
                     builder.setDefaults(Notification.DEFAULT_ALL);
                     Notification notification = builder.build();
                     messageNotificationManage.notify(123, notification);
                     Log.v(TAG,"33333333");
                 }

             }catch (InterruptedException e) {
                 e.printStackTrace();
             }
         }
     }

     @Override
     public void onDestroy(){
         messageThread.isRunning = false;
         super.onDestroy();
     }

     /**
      * 模拟发送信息
      */
     public String getServerMessage() {
         return "HELLO WORLD!";
     }

 }

最后记得配置下Service:

 <service android:name=".NotificationService">
             <intent-filter>
                 <action android:name="ymw.MY_SERVICE"/>
             </intent-filter>
         </service>

运行效果：