通过service和handler实现Notification在后台打开activity

一直以来都是在csdn查看各种大神的贡献资料，但自己却没有为他们做点什么。这几天在做一个即时聊天软件，需要实现一个功能：用户登录后，可以后台接收消息，通过Notification在消息栏提示，用户点击消息栏可以跳转到聊天界面。

为了模拟接收短信，我新建了三个Activity。在FirstActivity中我打开了service服务；在SecondActivity中我通过Handler的sendMessage方法发送数据，模拟收到短信；在第NotificationService.java类中，我通过重写Handler的handlerMessage方法，来实时监听，若收到sendMessage发送的数据，则跳转到ThirdActivity界面。Ok，闲话少说，直接上码：

Info.java:

package com.zr.android.info;

import android.os.Handler;

public class Info {
/** 实现界面更新 */
public static Handler jumpHandler = null;
}

FirstActivity.java:

package com.zr.android;

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 FirstActivity extends Activity{

Button button1;
@Override
protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.first);
button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
startActivity(intent);
//启动NotificationService
Intent notificationServiceIntent = new Intent();
notificationServiceIntent.setAction("com.zr.android.service.NotificationService");
startService(notificationServiceIntent);
}

});

}

}

SecondActivity.java:

package com.zr.android;

import com.zr.android.info.Info;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class SecondActivity extends Activity{
Button button1;
@Override
protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.second);
button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
android.os.Message meetmsg = new android.os.Message();	//创建handler消息
meetmsg.arg1=1;
Info.jumpHandler.sendMessage(meetmsg);
}

});

}
}

ThirdActivity.java:

package com.zr.android;

import android.app.Activity;
import android.os.Bundle;

public class ThirdActivity extends Activity{

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.third);
}

}

NotificationService.java

package com.zr.android.service;

import com.zr.android.R;
import com.zr.android.ThirdActivity;
import com.zr.android.info.Info;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;

public class NotificationService extends  Service{

static final int NOTIFICATION_ID = 0x1123;
@Override
public IBinder onBind(Intent intent) {
return null;
}

@Override
public void onCreate() {
super.onCreate();
Info.jumpHandler = new Handler(){
@Override
public void handleMessage(Message msg) {
if(msg.arg1==1){
//开启一个对话框或者是对话框形式的activity
//创建一个启动其他Activity的Intent
Intent intent = new Intent(getApplicationContext(), ThirdActivity.class);
PendingIntent pi = PendingIntent.getActivity(getApplicationContext(), 0, intent , 0);
//创建一个Notification
Notification notify = new Notification();
//为Notification设置图标，该图标显示在状态栏
notify.icon = R.drawable.notify;
//为Notification设置文本内容，该文本会显示在状态栏
notify.tickerText = "启动其他Activity的通知";
//为Notification设置发送时间
notify.when = System.currentTimeMillis();
//为Notification设置声音
notify.defaults = Notification.DEFAULT_SOUND;
//为Notification设置默认声音、默认振动、默认闪光灯
notify.defaults = Notification.DEFAULT_ALL;
//点击后关闭notifycation
notify.flags=Notification.FLAG_AUTO_CANCEL;
//设置事件信息
notify.setLatestEventInfo(getApplicationContext(), "普通通知","点击查看", pi);
//获取系统的NotificationManager服务
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
//发送通知
notificationManager.notify(NOTIFICATION_ID, notify);
}
super.handleMessage(msg);
}
};
}
@Override
public void onDestroy() {
super.onDestroy();
}
}

first.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="1111111111111111111" />

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="开启service" />

</LinearLayout>

second.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="22222222222222222" />

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="发送handler信息" />

</LinearLayout>

third.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="333333333333333333" />

</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.zr.android"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="10" />

<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".FirstActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".SecondActivity"></activity>
<activity android:name=".ThirdActivity"></activity>
<service android:name="com.zr.android.service.NotificationService">
<intent-filter>
<action android:name="com.zr.android.service.NotificationService" />
</intent-filter>
</service>
</application>
<!-- 添加操作闪光灯的权限 -->
<uses-permission android:name="android.permission.FLASHLIGHT"/>
<!-- 添加操作振动器的权限 -->
<uses-permission android:name="android.permission.VIBRATE"/>
</manifest>

如果有什么问题欢迎大家指正，我们一起探讨。还有Notification设置部分是参考《疯狂Android讲义》的，在这表示感谢。