Broadcast Receive的使用

最新推荐文章于 2025-06-10 01:45:34 发布

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本文介绍了一个简单的Android应用程序案例，展示了如何使用BroadcastReceiver组件发送和接收广播Intent。通过一个实际的例子，详细解释了发送广播的方法及如何创建和注册广播接收器。

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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 stub
				Intent 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;
	@Override
	public 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>