Android学习之本地广播使用方法详解

概述本地广播信息只能在应用程序内部传递，同时广播接收器也只能接收应用程序内部的广播消息。

本地广播信息只能在应用程序内部传递，同时广播接收器也只能接收应用程序内部的广播消息。

MainActivity代码

package com.example.luobo.mybroadcastreceiver;import androID.content.broadcastReceiver;import androID.content.Context;import androID.content.Intent;import androID.content.IntentFilter;import androID.support.v4.content.LocalbroadcastManager;import androID.support.v7.app.AppCompatActivity;import androID.os.Bundle;import androID.vIEw.VIEw;import androID.Widget.button;import androID.Widget.Toast;public class MainActivity extends AppCompatActivity implements VIEw.OnClickListener{  private button button;  private IntentFilter intentFilter;  private LocalbroadcastManager localbroadcastManager ;  private LocalReceiver localReciiver;  @OverrIDe  protected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    button = (button)findVIEwByID(R.ID.send_button);    button.setonClickListener(this);    localbroadcastManager = LocalbroadcastManager.getInstance(this);//使用    intentFilter = new IntentFilter();    intentFilter.addAction("com.example.luobo.mybroadcastreceiver.LOCAL_broADCAST");    localReciiver = new LocalReceiver();    localbroadcastManager.registerReceiver(localReciiver,intentFilter);  }  @OverrIDe  protected voID onDestroy() {    super.onDestroy();    localbroadcastManager.unregisterReceiver(localReciiver);  }  @OverrIDe  public voID onClick(VIEw vIEw) {    Intent intent = new Intent("com.example.luobo.mybroadcastreceiver.LOCAL_broADCAST");    localbroadcastManager.sendbroadcast(intent);  }  class LocalReceiver extends broadcastReceiver{    @OverrIDe    public voID onReceive(Context context,Intent intent) {      Toast.makeText(context,"received local broadcast",Toast.LENGTH_SHORT).show();    }  }}

首先通过LocalbroadcastManager（本地广播管理类）的getInstance(this)方法获取实例，注册广播消息时是调用localbroadcastManager实例的registerReceiver(参数1,参数2)方法注册（参数1是本地广播接受者，参数2是过滤器只选择接收特定的广播消息），调用localbroadcastManager实例的sendbroadcast（Initent initent）方法发送广播消息。

MyRecevity

package com.example.luobo.mybroadcastreceiver;import androID.content.broadcastReceiver;import androID.content.Context;import androID.content.Intent;import androID.Widget.Toast;public class MyReceiver extends broadcastReceiver {  @OverrIDe  public voID onReceive(Context context,Intent intent) {    Toast.makeText(context,"Received in MybroadCastReceiver",Toast.LENGTH_SHORT).show();    abortbroadcast();  }}

activity_main.xml

<?xml version="1.0" enCoding="utf-8"?><androID.support.constraint.ConstraintLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"  xmlns:app="http://schemas.androID.com/apk/res-auto"  xmlns:tools="http://schemas.androID.com/tools"  androID:layout_wIDth="match_parent"  androID:layout_height="match_parent"  tools:context="com.example.luobo.mybroadcastreceiver.MainActivity">  <button    androID:ID="@+ID/send_button"    androID:layout_wIDth="match_parent"    androID:layout_height="wrap_content"    androID:text="发送广播"/></androID.support.constraint.ConstraintLayout>

AndroIDMainfest.aml

<?xml version="1.0" enCoding="utf-8"?><manifest xmlns:androID="http://schemas.androID.com/apk/res/androID"  package="com.example.luobo.mybroadcastreceiver">  <application    androID:allowBackup="true"    androID:icon="@mipmap/ic_launcher"    androID:label="@string/app_name"    androID:roundIcon="@mipmap/ic_launcher_round"    androID:supportsRtl="true"    androID:theme="@style/Apptheme">    <activity androID:name=".MainActivity">      <intent-filter>        <action androID:name="androID.intent.action.MAIN" />        <category androID:name="androID.intent.category.LAUNCHER" />      </intent-filter>    </activity>    <receiver      androID:name=".MyReceiver"      androID:enabled="true"      androID:exported="true">      <intent-filter        androID:priority="100">        <action androID:name="com.example.luobo.mybroadcastreceiver.LOCAL_broADCAST"/>      </intent-filter>    </receiver>  </application></manifest>

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