Android (Notification)消息推送机制
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从网上查询资料学习Android消息推送机制，效果图如下：
1.首先是布局文件代码 activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="hello" /> <Button android:id="@+id/btnStart" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="通知" /> <Button android:id="@+id/btnStop" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="清除" /> </LinearLayout>
2.然后是java主界面代码MainActivity.java
package com.example.notificationservice;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity implements OnClickListener { private Button btnStart; private Button btnStop;
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
} private 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 v) { int id = v.getId(); if (id == R.id.btnStart) { // 启动Service
Intent intent = new Intent();
intent.setAction("ymw.MY_SERVICE");
startService(intent);
} if (id == R.id.btnStop) { // 关闭Service
Intent intent = new Intent();
intent.setAction("ymw.MY_SERVICE");
stopService(intent);
}
}
@Override public void onBackPressed() {
System.exit(0); super.onBackPressed();
}
}3.然后是消息推送服务文件 NotificationService.java
package com.example.notificationservice;import android.app.Notification;import android.app.NotificationManager;import android.app.PendingIntent;import android.app.Service;import android.content.Context;import android.content.Intent;import android.os.IBinder;public class NotificationService extends Service { // 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 int messageNotificationID = 1000; private Notification messageNotification = null; private NotificationManager messageNotificatioManager = null; public IBinder onBind(Intent intent) { return null;
}
@Override public int onStartCommand(Intent intent, int flags, int startId) { // 初始化
messageNotification = new Notification();
messageNotification.icon = R.drawable.ic_launcher;
messageNotification.tickerText = "新消息";
messageNotification.defaults = Notification.DEFAULT_SOUND;
messageNotificatioManager = (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);
} /**
* 从服务器端获取消息
*
*/
class MessageThread extends Thread { // 设置是否循环推送
public boolean isRunning = true; public void run() { // while (isRunning) {
try { // 间隔时间
Thread.sleep(1000); // 获取服务器消息
String serverMessage = getServerMessage(); if (serverMessage != null && !"".equals(serverMessage)) { // 更新通知栏 messageNotification.setLatestEventInfo(
getApplicationContext(), "新消息", "您有新消息。"
+ serverMessage, messagePendingIntent);
messageNotificatioManager.notify(messageNotificationID,
messageNotification); // 每次通知完，通知ID递增一下，避免消息覆盖掉
messageNotificationID++;
}
} catch (InterruptedException e) {
e.printStackTrace();
} // } }
}
@Override public void onDestroy() { // System.exit(0);
messageThread.isRunning = false; super.onDestroy();
} /**
* 模拟发送消息
*
* @return 返回服务器要推送的消息，否则如果为空的话，不推送 */
public String getServerMessage() { return "NEWS!";
}
}
4.最后别忘了在mainfeast.xml文件中配置Service
