Android广播的使用（动态注册和静态注册）

Posted 2021-02-06 (?ω?)

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

 

 

 

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>

啊啊