广播机制笔记

动态注册与静态注册

package com.example.admin.broadcastreceiver;import android.app.Activity;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.os.Bundle;import android.widget.Toast;public class MainActivity extends Activity {    private IntentFilter intentFilter;    private NetworkChangeReceiver networkChangeReceiver;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        intentFilter=new IntentFilter();        intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");        networkChangeReceiver=new NetworkChangeReceiver();        registerReceiver(networkChangeReceiver,intentFilter);    }    @Override    protected void onDestroy() {        super.onDestroy();        unregisterReceiver(networkChangeReceiver);    }    private class NetworkChangeReceiver extends BroadcastReceiver{        @Override        public void onReceive(Context context, Intent intent) {            ConnectivityManager connectivityManager= (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);            NetworkInfo networkInfo=connectivityManager.getActiveNetworkInfo();            if(networkInfo!=null&&networkInfo.isAvailable()){                Toast.makeText(context,"成功连接网络",Toast.LENGTH_SHORT).show();            }else{                Toast.makeText(context,"网络已断开",Toast.LENGTH_SHORT).show();            }        }    }}

以上为动态注册发送广播的前提是程序启动

package com.example.admin.broadcastreceiver;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.widget.Toast;/** * Created by admin on 2016/3/17. */public class BootCompleteReceiver extends BroadcastReceiver{    @Override    public void onReceive(Context context, Intent intent) {        Toast.makeText(context,"Boot Complete",Toast.LENGTH_SHORT).show();    }}

这个代码是静态注册开机启动

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.admin.broadcastreceiver">    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        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=".BootCompleteReceiver">            <intent-filter>                <action android:name="android.intent.action.BOOT_COMPLETED"/>            </intent-filter>        </receiver>    </application></manifest>

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

第一个是网络变化系统传出

第二个是系统启动/开始传出

<receiver android:name=".BootCompleteReceiver">            <intent-filter>                <action android:name="android.intent.action.BOOT_COMPLETED"/>            </intent-filter>        </receiver>

这个表示当收到系统开启/开机传出信息之后就启动 BootCompleteReceiver 大喇叭

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