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：