broadcastreceiver动态注册案例演示,供大家参考,具体内容如下
此案例共介绍2种动态注册广播接收器,为自定义广播接收器和系统广播接收器。当点击发送按钮后,将会弹出收到自定义广播的提示;当打开或关闭飞行模式时,会出现飞行模式发生变化的提示。
效果图:
代码:
mainactivity.java
public class mainactivity extends appcompatactivity { private mybroadcastreceiver receiver1; private netreceiver receiver2; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); //1.动态注册自定义广播接收器 receiver1 = new mybroadcastreceiver(); intentfilter filter1 = new intentfilter(); //使用包名作为自定义广播action filter1.addaction("com.example.a01dynamicregister"); registerreceiver(receiver1, filter1); //2.动态注册系统广播接收器 receiver2 = new netreceiver(); intentfilter filter2 = new intentfilter(); //添加切换飞行模式action filter2.addaction(intent.action_airplane_mode_changed);//当飞行模式打开或关闭时,接收该广播 registerreceiver(receiver2, filter2); //3.点击按钮发送自定义广播 findviewbyid(r.id.btn).setonclicklistener(new view.onclicklistener() { @override public void onclick(view view) { intent intent = new intent("com.example.a01dynamicregister");//注意:自定义广播的发送和接受内容必须一直,否则接收不到 sendbroadcast(intent); } }); } @override protected void ondestroy() { super.ondestroy(); //记得用完需要销毁广播接收器 if (receiver1 != null) { unregisterreceiver(receiver1); } if (receiver2 != null) { unregisterreceiver(receiver2); } } } //接收自定义广播 class mybroadcastreceiver extends broadcastreceiver { @override public void onreceive(context context, intent intent) { string action = intent.getaction(); toast.maketext(context, "收到自定义广播了~~action为:" + action, toast.length_long).show(); } } //接收系统广播 class netreceiver extends broadcastreceiver { @override public void onreceive(context context, intent intent) { string action = intent.getaction(); if (intent.action_airplane_mode_changed.equals(action)) { toast.maketext(context, "飞行模式发生变化~~", toast.length_long).show(); } } }
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <linearlayout 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" tools:context=".mainactivity"> <button android:id="@+id/btn" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="发送自定义广播"/> </linearlayout>
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。