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;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.first);button1 = (Button)findViewById(R.id.button1);button1.setOnClickListener(new OnClickListener(){@Overridepublic 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;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.second);button1 = (Button)findViewById(R.id.button1);button1.setOnClickListener(new OnClickListener(){@Overridepublic 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{@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.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;@Overridepublic 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。