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Android学习之本地广播使用方法详解

2019年07月24日  | 移动技术网IT编程  | 我要评论

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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>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。

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