Android广播的使用（动态注册和静态注册） _动态注册

君不见长松卧壑困风霜，时来屹立扶明堂。这篇文章主要讲述Android广播的使用（动态注册和静态注册）相关的知识，希望能为你提供帮助。
1》判断网络状态网络广播（动态注册）

package com.example.guangbo;

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.net.NetworkRequest;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

import java.nio.channels.NetworkChannel;

public class MainActivity extends AppCompatActivity {
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"); //网络变化是会发送该广播
networkChangeReceiver=new NetworkChangeReceiver();
registerReceiver(networkChangeReceiver,intentFilter);
}

@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(networkChangeReceiver);
}
class NetworkChangeReceiver extends BroadcastReceiver{
@Override
//在网络发生变化时，onReceive会被调用
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,"网络可用",Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(context,"网络不可用",Toast.LENGTH_SHORT).show();
}

}
}
}

//由于涉及到权限问题，所以需要在AndroidMainfest.xml中添加如下注册代码

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

在网络发生变化时，手机便会出现提示

【Android广播的使用（动态注册和静态注册）】

文章图片

1》接收开机广播（静态注册）
New-》others-》Broadcast Receiver可以快速创建广播

public void onReceive(Context context, Intent intent) {
// TODO: This method is called when the BroadcastReceiver is receiving
// an Intent broadcast.
Toast.makeText(context,"开机成功",Toast.LENGTH_SHORT).show();
}
AndroidMainfest.xml：

< ?xml version="1.0" encoding="utf-8"?>
< manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.guangbo">

< uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
< uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/> //加入新的权限

< 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>
//创建项目自带的注册方式
< receiver
android:name=".BootCompleteReceiver"
android:enabled="true"
android:exported="true">
//具体注册广播
< intent-filter>
< action android:name="android.intent.action.BOOT_COMPLETED"/>
< /intent-filter>
< /receiver>
< /application>

< /manifest>