Android开发——四大组件BroadcastReceiver实例广播事件的拦截转发

来源：互联网发布：淘宝店铺类目修改2016 编辑：程序博客网时间：2024/06/05 20:14

我们通过一个实例来认识一下BroadcastReceiver广播接收器。我们两个广播接收器我们用不同的方式去注册，然后设置一个优先级，第一个广播优先级更高，让第一个广播事件给第二个增加一些内容。

在manifest中注册并设置第一个广播的优先级为最高（-1000~1000，1000为最高）

<receiver android:name="com.example.broadcastreceiver.firstBroadReveiver">            <intent-filter                android:priority="1000">                <action android:name="briup"/>            </intent-filter></receiver>

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.broadcastreceiver.MainActivity" >    <Button         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="btn"/></RelativeLayout>

MainActivity.java

package com.example.broadcastreceiver;import android.app.Activity;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.view.View;public class MainActivity extends Activity {private SecandBroadReveiver secandBroadReveiver;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);secandBroadReveiver=new SecandBroadReveiver();IntentFilter filter=new IntentFilter();filter.addAction("briup");registerReceiver(secandBroadReveiver,filter);}public void btn(View view) {// TODO Auto-generated method stubIntent intent=new Intent();intent.setAction("briup");intent.putExtra("data", "原来的广播");sendOrderedBroadcast(intent, null);//sendBroadcast(intent);}}

firstBroadcastReceiver.java

package com.example.broadcastreceiver;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.os.Bundle;import android.widget.Toast;public class firstBroadReveiver extends BroadcastReceiver{@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubString data=intent.getStringExtra("data");Toast.makeText(context, "我是firstBroadReveiver  "+data, Toast.LENGTH_LONG).show();//截断广播//abortBroadcast();Bundle bundle=new Bundle();bundle.putString("data1", "   增加这句话");setResultExtras(bundle);}}

SecandBroadcastReceiver.java

package com.example.broadcastreceiver;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.os.Bundle;import android.widget.Toast;public class SecandBroadReveiver extends BroadcastReceiver{@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubString data=intent.getStringExtra("data");Bundle bundle=getResultExtras(false);String data1 =bundle.getString("data1");Toast.makeText(context, "我是SecandBroadReveiver"+data+data1, Toast.LENGTH_LONG).show();}}

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