Broadcast Receive的使用

 广播接收者（ BroadcastReceiver ）用于接收广播 Intent ，广播 Intent 的发送

是通过调用 Context.sendBroadcast() 、 Context.sendOrderedBroadcast()来实现的。

然后创建一个BroadcastReceiver的继承类，在这个继承类中重载onReceive（Cotext context , Intent intent）方法，

处理接收到的intent。

下面看一个例子：

//实例效果：点击一个Activity中的按钮，广播一个消息，然后在消息栏中提示，下拉消息栏，点击消息，跳转到另一个

//Activity并显示信息内容。

import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;public class BroadcastReceiverActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        Button button = (Button)findViewById(R.id.send);        button.setOnClickListener(new Button.OnClickListener(){public void onClick(View v) {// TODO Auto-generated method stubIntent intent = new Intent("com.wen.BDCASTRCVER");        intent.putExtra("msg", "地瓜地瓜，我是土豆，听到请回复");        BroadcastReceiverActivity.this.sendBroadcast(intent);}               });                    }}

广播消息："地瓜地瓜，我是土豆，听到请回复

然后创建广播接收器：

import android.app.Notification;import android.app.NotificationManager;import android.app.PendingIntent;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;public class MyBroadcastReceiver extends BroadcastReceiver {    Notification m_Notification;    NotificationManager m_NotificationManager;@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stub        String msg = intent.getStringExtra("msg");        //Toast.makeText(context, msg, Toast.LENGTH_LONG).show();        m_NotificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);        m_Notification = new Notification();        m_Notification.icon = R.drawable.ic_launcher;        m_Notification.tickerText = msg;        m_Notification.defaults = Notification.DEFAULT_SOUND;        Intent m_Intent = new Intent(context,ContentActivity.class);        m_Intent.putExtra("content", msg);        PendingIntent m_PendingIntent = PendingIntent.getActivity(context, 0, m_Intent, Intent.FLAG_ACTIVITY_NEW_TASK);        m_Notification.setLatestEventInfo(context, "content", msg,m_PendingIntent);        m_NotificationManager.notify(0, m_Notification);}}

点击跳转到：

import android.app.Activity;import android.os.Bundle;import android.widget.TextView;public class ContentActivity extends Activity {    @Override    public void onCreate(Bundle savedInstanceState){    super.onCreate(savedInstanceState);    setContentView(R.layout.msgcontent);    TextView m_TextView = (TextView)findViewById(R.id.tv1);    m_TextView.setText(this.getIntent().getCharSequenceExtra("content"));    }}

在Manifest.xml中也要声明

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.wen.bcreceiver"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk android:minSdkVersion="8" />    <application        android:icon="@drawable/ic_launcher"        android:label="@string/app_name" >        <activity            android:name=".BroadcastReceiverActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <receiver android:name=".MyBroadcastReceiver">            <intent-filter >                <action android:name="com.wen.BDCASTRCVER"/>            </intent-filter>        </receiver>        <activity android:name=".ContentActivity"></activity>    </application></manifest>